CN114215623A - Coated valve for internal combustion engine and method for manufacturing same - Google Patents
Coated valve for internal combustion engine and method for manufacturing same Download PDFInfo
- Publication number
- CN114215623A CN114215623A CN202111563591.XA CN202111563591A CN114215623A CN 114215623 A CN114215623 A CN 114215623A CN 202111563591 A CN202111563591 A CN 202111563591A CN 114215623 A CN114215623 A CN 114215623A
- Authority
- CN
- China
- Prior art keywords
- valve
- recessed
- disk
- deposition
- face
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 5
- 238000000034 method Methods 0.000 title claims description 18
- 230000008021 deposition Effects 0.000 claims abstract description 40
- 239000012720 thermal barrier coating Substances 0.000 claims abstract description 31
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000956 alloy Substances 0.000 claims abstract description 9
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 8
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 238000000151 deposition Methods 0.000 claims description 43
- 230000007704 transition Effects 0.000 claims description 22
- 239000011248 coating agent Substances 0.000 claims description 18
- 238000000576 coating method Methods 0.000 claims description 18
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 6
- 238000007750 plasma spraying Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 5
- 238000003754 machining Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 abstract description 7
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 22
- 238000012360 testing method Methods 0.000 description 7
- 238000004088 simulation Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 239000011651 chromium Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000005524 ceramic coating Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- 229910000952 Be alloy Inorganic materials 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000010942 ceramic carbide Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- -1 silicon nitride Chemical class 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
- F01L3/04—Coated valve members or valve-seats
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2301/00—Using particular materials
- F01L2301/02—Using ceramic materials
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
A coated valve for an internal combustion engine and a method of making the same. The valve comprises a disk portion forged from iron and/or a nickel-based alloy and a thermal barrier coating applied to the side of the disk portion forming the disk end face, wherein the side of the disk portion forming the disk end face is formed with a recessed deposition zone and a land confinement zone surrounding the recessed deposition zone, wherein the land confinement zone defines a plane in which the disk end face of the valve lies, and the thermal barrier coating is applied to the recessed deposition zone with a thickness flush with and cooperating with the land confinement zone to form the disk end face. According to the invention, the modification is carried out on one side of the end face of the valve disc, so that the thermal barrier coating applied on the valve disc is not easy to fall off or collapse, and the good cooling performance of the end face of the valve disc is still maintained.
Description
Technical Field
The present invention generally relates to valves for internal combustion engines.
Background
Internal combustion engine valves (also known as "mushroom valves" or "poppet valves") including intake valves (or "intake valves") and exhaust valves (or "exhaust valves") are required to be continuously improved in heat insulating properties or high temperature resistance, etc., due to their harsh high temperature operating environment.
US20200318504a1 discloses applying a protective thermal barrier ceramic coating of several tens of microns thickness to the outer surface of the disk portion of an internally cooled (hollow) valve, including the disk end face, the valve seat region and/or the disk back face. The ceramic coating can comprise a bottom layer and a surface layer, and the surface of the substrate can be prepared by sand blasting, cleaning and/or etching before coating so as to enhance the bonding performance of the ceramic high-temperature coating and the metal surface and avoid the coating from falling off.
CN1451850A discloses a heat insulating film 4 which is coated with a thickness of 0.1 to 0.2mm by thermal spraying or the like on the surface of a valve head (disk part) other than the valve face (valve seat region). The heat insulating film is made of a heat-resistant insulating material such as a ceramic oxide such as alumina, a ceramic carbide such as silicon carbide, a ceramic nitride such as silicon nitride, an aluminum silicate, a chromium oxide, or the like. The surface to be sprayed may be roughened in advance to enhance the adhesion of the thin film 4. The film 4 may consist of a multilayer structure of a high adhesion bonding inner layer 4a and a thermally insulating outer layer 4 b. Further, a convex heat insulating plate 7 may be attached to the front surface 6a (disk end surface) of the valve head by welding or the like to form a heat insulating space 8. Thereby reducing heat loss to increase thermal efficiency, thereby improving output and fuel efficiency performance of the engine.
However, thermal barrier coatings of the type applied to the valve, particularly the disk end face, are highly susceptible to chipping or flaking off due to the harsh operating environment of the valve.
Disclosure of Invention
The object of the invention is to provide an internal combustion engine valve with a reliable thermal barrier coating.
According to a first aspect of the present invention, there is provided a method of manufacturing a valve for an internal combustion engine, the valve having a disc portion and a stem portion projecting from the disc portion, the method comprising:
machining a side of the disc portion of the valve facing away from the stem portion to have a recessed deposition area and a flange restriction area surrounding the recessed deposition area, wherein the flange restriction area defines a plane in which a disc end face of the valve lies;
a thermal barrier coating is deposited on the recessed deposition area of the disk portion of the valve until it is flush with the flange relief area to collectively form a disk end face therewith.
In accordance with the method of the present invention, a plurality of annular threads are machined into a recessed deposition area of a disk portion of a valve, preferably prior to depositing a thermal barrier coating. Such a ring thread is very advantageous for the deposition of the coating.
In accordance with the method of the present invention, a transition chamfer of greater than 90 ° may be formed between the recessed deposition area and the flange confinement area of the disc portion of the valve. Such a flared transition zone connecting the recessed deposition zone and the flange confinement zone will further enhance the bonding of the coating to the substrate, making the coating less prone to peeling off.
According to the method of the invention, the thickness of the thermal barrier coating can be 0.3-0.8 mm, preferably 0.4-0.6 mm.
According to the method of the invention, the thermal barrier coating can be deposited by plasma spraying a ceramic powder composition consisting of ZrO2And Y2O3Composition of Y2O3The content is 6 to 8 percent, and the balance is ZrO2。
The method according to the invention may further comprise depositing a transition layer in the recessed deposition zone prior to depositing the thermal barrier coating. The thickness of the transition layer can be 0.05-0.15 mm. The disk part of the valve can be an iron and/or nickel-based alloy forged piece, and a transition layer can be deposited by plasma spraying MCrAlY alloy powder, wherein M is Ni and/or Co, the Cr content is 20-24%, the Al content is 8-12%, the Y content is 0.3-1.2%, and the balance is M.
According to a second aspect of the present invention, there is provided a valve comprising a disc portion forged from an iron and/or nickel based alloy, and a thermal barrier coating applied to the disc portion on the side intended to form the disc end face, wherein the disc portion on the side intended to form the disc end face is formed with a recessed deposition zone and a land confinement zone surrounding the recessed deposition zone, wherein the land confinement zone defines the plane in which the disc end face of the valve lies, the thermal barrier coating being applied to the recessed deposition zone to a thickness flush with and co-incident with the land confinement zone to form the disc end face.
The valve according to the present invention may further include a stem portion projecting from a side of the disc portion facing away from the disc end surface.
In accordance with a preferred embodiment of the gas gate of the present invention, the recessed deposition zone of the disk portion of the gas gate is comprised of a circular flat bottom portion and a flared transition portion, the ring confinement zone is an annular platform, and the flared transition portion of the recessed deposition zone connects the circular flat bottom portion and the annular platform together.
Through a series of simulation debugging, the inventor finds that the diameter D of the formed valve plate end face and the radial width W1 of the ring platform limiting area can effectively ensure the firmness of the valve coating in practical use when the following conditions are met: d is more than or equal to 25W1 and less than or equal to 50W 1. The inventors have further found that the resulting diameter D of the end face of the valve disc, the radial width W1 of the land confinement region, the radial span W2 of the flared transition portion, and the height difference T between the recessed deposition region and the land confinement region are such that the resulting coated valve will fully achieve long term reliable operation in harsh operating environments such as exhaust valves: D/(W1+ W2) is not less than 1.2W2/T, and W2 is not less than 2W 1.
According to the valve, the height difference between the sunken deposition area and the ring platform limiting area can be 0.3-0.8 mm.
In the gas gate according to the present invention, the recessed deposition area is preferably formed with coating deposition surface features in the form of annular threads.
According to the valve of the present invention, the thermal barrier coating may comprise a transitional inner layer and a body outer layer. The thickness of the transition inner layer preferably does not exceed 1/4 the thickness of the outer layer of the body.
According to the invention, the coating deposition area and the flange limiting area surrounding the coating deposition area are arranged on one side of the end face of the valve, so that the thermal barrier coating applied on the valve is not easy to fall off or collapse, and the good cooling performance of the end face of the valve is still maintained.
Drawings
FIG. 1 is a schematic view of a valve configuration;
FIG. 2 is a partial cross-sectional view of a valve provided with a thermal barrier coating according to the present invention;
FIG. 3 is an enlarged schematic view of FIG. 2 at position I;
FIG. 4 is a partial cross-sectional view of a valve having no thermal barrier coating applied thereto in accordance with the present invention;
FIG. 5 is an enlarged schematic view of FIG. 4 at position I;
FIG. 6 is a side view of the disk end of the valve shown in FIG. 4;
FIG. 7 is a schematic structural diagram of a combustor simulation apparatus for simulation testing the cooling effect of a thermal barrier coated valve of the present invention;
FIG. 8 is a schematic structural diagram of a wear testing machine simulating a valve working condition environment;
FIG. 9 is an end view of a disk after an abrasion test for a coated valve according to the present invention;
FIG. 10 is an end view of a coated valve used as a comparative reference after an abrasion test; and
FIG. 11 is a plot of the temperature profile of a coated valve versus a non-coated valve according to the present invention at a particular time after operation on an actual passenger vehicle engine.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Fig. 1 shows a conventional valve for an internal combustion engine, which is composed of a disk 10 and a stem 20 extending from the side of the disk 10 facing away from the disk end face (leftmost in the figure). Such valves may be formed from iron, nickel or iron-nickel based alloys, typically by forging, and may be used as exhaust or intake valves, wherein a hollow sodium-filled valve may also be formed for use as an exhaust valve.
Fig. 2 shows a partial cross-sectional view of a valve provided with a thermal barrier coating according to the invention. As shown in the drawing, a thermal barrier coating 11 having a thickness T is formed on the disk end surface side (left side in the drawing) of the disk portion 10.
Fig. 3 is an enlarged schematic view of fig. 2 at position I. As shown, the thermal barrier coating 11 is comprised of a transitional inner layer 13 and a bulk outer layer 12. The thickness of the transitional inner layer 13 is typically no more than one-quarter of the thickness of the main body outer layer 12. For example, the thickness of the transition inner layer 1 can be 0.05-0.15 mm, and the components can be alloy materials: MCrAlY, wherein M is Ni and/or Co, Cr content is 20-24%, Al content is 8-12%, Y content is 0.3-1.2%, and the balance is M. The thickness of the outer layer of the body may be0.4-0.6 mm, and the component can be ZrO2And Y2O3Composition of (a): wherein Y is2 O 36 to 8 percent of ZrO in percentage by weight and the balance of ZrO2。
FIG. 4 is a partial cross-sectional view of a valve with no thermal barrier coating applied. As shown, the disk portion 10 is formed with a concave deposition region on one side of the disk end surface (left side as shown) and a flange confinement region surrounding or enclosing the concave deposition region. The recessed deposition zone is formed by a circular flat bottom portion 17 and a flared transition portion 18, the flange confinement zone being in the form of an annular platform 16, wherein the flared transition portion 18 connects the circular flat bottom portion 17 and the annular platform 16 together. The distance between the plane 15 defined by the annular platform 16 and the circular flat bottom portion 17 is the thickness T of the thermal barrier coating 11. T may be, for example, 0.3 to 0.8 mm.
Fig. 5 is an enlarged schematic view at a position I of fig. 4, and fig. 6 is a view seen from a disc end surface side of the valve shown in fig. 4. As shown, the circular flat bottom portion 17 is formed with a plurality of annular threads 19, which may have a thread depth of, for example, 0.04 to 0.06 mm. The radial width W1 of the annular platform 16 may be, for example, 0.75 mm. The radial width (or span) W2 of the transition portion 18 may be, for example, 2.55 mm.
The maximum diameter (disc diameter) of the disc end face of the valve can be changed according to practical application, the diameter of the valve of a common passenger car is 10-40 mm, generally, the disc diameter of the most common exhaust valve is about 25mm, and an intake valve is slightly larger (about a few millimeters larger); the diameter of the commercial vehicle valve is 20-60 mm, generally, the diameter of a most common commercial vehicle valve plate is about 45mm, wherein the diameter of an inlet valve plate is slightly larger than an exhaust valve (about a few millimeters larger).
When applying the thermal barrier coating 11, the disk end face side (left side in fig. 4) of the disk portion 10 is first cleaned, then the transition inner layer 13 is deposited in the recessed deposition region by using the plasma spraying process, and then the main body outer layer 12 is deposited on the transition inner layer 13 by using the plasma spraying process until the main body outer layer is flush with the annular platform 16 and defines a plane 15 (the plane where the final disk end face is located). Finally, the entire disk end face may also be polished to make the coating surface smoother to reduce heat absorption.
The combustion chamber simulation device shown in fig. 7 was used for simulation testing of the cooling effect of the valve provided with a thermal barrier coating according to the present invention. As shown in the drawing, the apparatus includes a heating furnace 30 and a heating body 31 inside the heating furnace 30. The piston cylinder 32 extends outward from the interior of the furnace 30 to slightly protrude out of the furnace 30. The disk portion 10 of the valve is suspended within the piston cylinder 32 with the stem portion projecting downwardly. The piston 33 is inserted from above the piston cylinder 32 until it approaches the disc end face of the valve (at a 1.5mm interval). A temperature control point T1 was selected at a position slightly higher than the top end of the piston cylinder 32 inside the heating furnace 30, and a temperature measurement point T2 was selected at the neck portion of the connection between the disc portion and the stem portion of the damper (9.5 mm from the disc end face). Table 1 gives comparative cooling data for the coated valve of the invention and for an uncoated valve of the same type obtained using the above-described simulation apparatus.
Table 1: valve cooling contrast data under simulated environment
The data presented in Table 1 show that at 700 ℃ the temperature of the coated valve of the present invention drops by 20-30 ℃ compared to the temperature of the uncoated valve (of the same type) at the temperature measurement point T2. This reduces the loss of heat transfer from the combustion chamber through the valve to the outside, improving the thermal efficiency of the engine.
FIG. 8 shows an abrasion tester incorporating a coated valve simulating valve operating conditions, with the following operating conditions:
heating temperature: 950 ℃; rotating speed: 1800 rpm; the operation target time is as follows: and (5) 100 h.
And (5) stopping the furnace for cooling every 10 hours of operation, and detecting the bonding condition of the coating.
After 100h of operation of the valve according to the invention, the coating structure is still intact, see fig. 9. The valve used as a comparison reference (only one side of the end face of the disc is not provided with a flange or a ring platform limiting area, namely the edge has no step, the same coating is applied to the whole end face of the disc, and the rest is unchanged) has the phenomenon of collapse of the valve coating after 30 hours of operation, and see fig. 10.
Fig. 11 shows the temperature profile of the points of the (thermometric) coated valve according to the invention after 2h of operation in a passenger car engine in succession with uncoated valves of the same type. Test results as shown, the maximum temperature of the coated valve of the present invention in the area of the disc end coating 11 was about 20 c lower than that of the uncoated valve. This further demonstrates that the coated valve of the present invention is effective in reducing the operating temperature of the valve, thereby improving the thermal efficiency of the engine.
The above tests all used the following specification valve examples:
the forged valve steel comprises the following components in percentage by mass: 0.51 percent of C, 0.11 percent of Si, 8.88 percent of Mn, 3.98 percent of Ni, 21.35 percent of Cr, 1.01 percent of W, 2.02 percent of Nb and 0.51 percent of N; the valve was formed with a disc diameter D of 24.4mm and a stem diameter of 5mm, wherein the valve coating was applied to the outer layer of the main body (composition: Y)2O37.5 wt%, the balance being ZrO2) Has a depth of 0.45mm, and a transition inner layer (composition: 22.4 wt% of Cr, 10.3 wt% of Al, Y: 1.02 wt%, balance Ni) was 0.1mm in depth, 0.78mm in W1, and 2.5mm in W2.
Claims (16)
1. A method of manufacturing a valve for an internal combustion engine, the valve having a disc portion and a stem portion extending from the disc portion, the method comprising:
machining a side of the disc portion of the valve facing away from the stem portion to have a recessed deposition area and a flange restriction area surrounding the recessed deposition area, wherein the flange restriction area defines a plane in which a disc end face of the valve lies;
a thermal barrier coating is deposited on the recessed deposition area of the disk portion of the valve until it is flush with the flange relief area to collectively form a disk end face therewith.
2. The method of claim 1, wherein a plurality of annular threads are machined into the recessed deposition area of the disk portion of the valve prior to depositing the thermal barrier coating.
3. The method of claim 2, wherein the recessed deposition area and the flange confinement area of the disc portion of the valve form a transition chamfer of greater than 90 °.
4. The method of claim 1, wherein the thermal barrier coating has a thickness of 0.3 to 0.8 mm.
5. The method of claim 1, wherein the thermal barrier coating is deposited by plasma spraying a ceramic powder composition, wherein the ceramic powder composition is formed from ZrO2And Y2O3Composition of Y2O3The content is 6 to 8 percent, and the balance is ZrO2。
6. The method of claim 1, further comprising depositing a transition layer in the recessed deposition zone prior to depositing the thermal barrier coating.
7. A method according to claim 6, wherein the transition layer has a thickness of 0.05 to 0.15 mm.
8. A method according to claim 6, wherein at least the disk portion of the valve is an iron and/or nickel base alloy forged piece, and the transition layer is deposited by plasma spraying MCrAlY alloy powder, wherein M is Ni and/or Co, the Cr content is 20 to 24%, the Al content is 8 to 12%, the Y content is 0.3 to 1.2%, and the balance is M.
9. A valve comprising a disk portion forged from an iron and/or nickel-based alloy and a thermal barrier coating applied to the disk portion on the side for forming the disk face, wherein the disk portion on the side for forming the disk face is formed with a recessed deposition zone and a land confinement zone surrounding the recessed deposition zone, wherein the land confinement zone defines the plane of the disk face of the valve, and the thermal barrier coating is applied to the recessed deposition zone at a thickness flush with and co-planar with the land confinement zone to form the disk face.
10. The valve of claim 9, further comprising a stem portion extending from a side of the disk portion facing away from the disk end face.
11. The valve according to claim 9, wherein the recessed deposition region of the disk portion of the valve is comprised of a circular flat bottom portion and a flared transition portion, the plateau limiting region being a circular annular plateau, the flared transition portion of the recessed deposition region connecting the circular flat bottom portion and the circular annular plateau together.
12. The valve according to claim 9, wherein the diameter D of the end surface of the valve disc and the radial width W1 of the land limiting region are formed to satisfy the following condition: d is more than or equal to 25W1 and less than or equal to 50W 1.
13. The gas gate according to claim 9, wherein the difference in height between the recess deposition area and the land limiting area is 0.3 to 0.8 mm.
14. The valve according to claim 9, wherein the recessed deposition area is formed with coating deposition surface features in the form of an annular thread.
15. The valve of claim 9, wherein the thermal barrier coating comprises a transitional inner layer and a body outer layer.
16. The valve of claim 15, wherein the thickness of the transitional inner layer is no more than 1/4 the thickness of the outer layer of the body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111563591.XA CN114215623A (en) | 2021-12-20 | 2021-12-20 | Coated valve for internal combustion engine and method for manufacturing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111563591.XA CN114215623A (en) | 2021-12-20 | 2021-12-20 | Coated valve for internal combustion engine and method for manufacturing same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114215623A true CN114215623A (en) | 2022-03-22 |
Family
ID=80704586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111563591.XA Pending CN114215623A (en) | 2021-12-20 | 2021-12-20 | Coated valve for internal combustion engine and method for manufacturing same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114215623A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2666847A1 (en) * | 1990-09-13 | 1992-03-20 | Peugeot | Compression-ignition engine with improved intake valve |
| CN104630686A (en) * | 2015-03-09 | 2015-05-20 | 河南普莱姆涂层科技有限公司 | Preparation method of thermal barrier coating containing long-service-life antioxidant bonding layer |
| CN104797728A (en) * | 2012-10-31 | 2015-07-22 | 福田金属箔粉工业株式会社 | Ni-Cr-Co alloy with high temperature corrosion resistance and surface modified poppet valve using the alloy |
| CN107269412A (en) * | 2016-04-08 | 2017-10-20 | 丰田自动车株式会社 | Internal combustion engine |
| CN109943847A (en) * | 2017-12-21 | 2019-06-28 | 通用汽车环球科技运作有限责任公司 | The gap filling sealant of thermal barrier coating |
| CN111279008A (en) * | 2017-10-27 | 2020-06-12 | 天纳克有限责任公司 | Internal combustion engine component with dynamic thermal barrier coating and methods of making and using such coating |
| CN113444996A (en) * | 2021-06-29 | 2021-09-28 | 潍柴动力股份有限公司 | Preparation method of thermal barrier coating, thermal barrier coating and engine piston |
| US20210310401A1 (en) * | 2020-04-01 | 2021-10-07 | Mazda Motor Corporation | Combustion-chamber structure of engine |
| CN216381536U (en) * | 2021-12-20 | 2022-04-26 | 重庆三爱海陵实业有限责任公司 | Valve for internal combustion engine |
-
2021
- 2021-12-20 CN CN202111563591.XA patent/CN114215623A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2666847A1 (en) * | 1990-09-13 | 1992-03-20 | Peugeot | Compression-ignition engine with improved intake valve |
| CN104797728A (en) * | 2012-10-31 | 2015-07-22 | 福田金属箔粉工业株式会社 | Ni-Cr-Co alloy with high temperature corrosion resistance and surface modified poppet valve using the alloy |
| CN104630686A (en) * | 2015-03-09 | 2015-05-20 | 河南普莱姆涂层科技有限公司 | Preparation method of thermal barrier coating containing long-service-life antioxidant bonding layer |
| CN107269412A (en) * | 2016-04-08 | 2017-10-20 | 丰田自动车株式会社 | Internal combustion engine |
| CN111279008A (en) * | 2017-10-27 | 2020-06-12 | 天纳克有限责任公司 | Internal combustion engine component with dynamic thermal barrier coating and methods of making and using such coating |
| CN109943847A (en) * | 2017-12-21 | 2019-06-28 | 通用汽车环球科技运作有限责任公司 | The gap filling sealant of thermal barrier coating |
| US20210310401A1 (en) * | 2020-04-01 | 2021-10-07 | Mazda Motor Corporation | Combustion-chamber structure of engine |
| CN113444996A (en) * | 2021-06-29 | 2021-09-28 | 潍柴动力股份有限公司 | Preparation method of thermal barrier coating, thermal barrier coating and engine piston |
| CN216381536U (en) * | 2021-12-20 | 2022-04-26 | 重庆三爱海陵实业有限责任公司 | Valve for internal combustion engine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5384200A (en) | Thermal barrier coating and method of depositing the same on combustion chamber component surfaces | |
| KR100802328B1 (en) | Method for forming a wear-resistant metal base composite coating layer and coating layer prepared using | |
| US8007246B2 (en) | Methods and apparatus for coating gas turbine engines | |
| CN101611171A (en) | Layered thermal barrier coatings and components with high porosity | |
| KR20180084064A (en) | Thermal insulated engine components, and methods of making the same using ceramic coatings | |
| JPH0448867B2 (en) | ||
| JP2018534479A (en) | Fabrication method using insulated steel piston crown and ceramic coating | |
| JPH1122424A (en) | Tappet for engine excellent in abrasion resistance and its manufacture | |
| JPH0715141B2 (en) | Heat resistant parts | |
| JPS63118059A (en) | Adiabatic coating method and gas turbine combustor | |
| US7998601B2 (en) | Sandwich thermal insulation layer system and method for production | |
| CN111279008A (en) | Internal combustion engine component with dynamic thermal barrier coating and methods of making and using such coating | |
| JP2000144365A (en) | Thermal barrier coating member, method of manufacturing thermal barrier coating member, and high temperature gas turbine using thermal barrier coating member | |
| CN216381536U (en) | Valve for internal combustion engine | |
| CN113930710A (en) | A kind of thermal barrier coating material, its preparation method and application | |
| EP1491657B1 (en) | Method of applying a coating system | |
| JPH0527706B2 (en) | ||
| CN114215623A (en) | Coated valve for internal combustion engine and method for manufacturing same | |
| JPS62210329A (en) | Ceramic coated heat resistant member and its manufacturing method | |
| JP2008502804A (en) | Smooth outer coating for combustor components and method for coating the same | |
| KR19990009039A (en) | Engine tappet with excellent wear resistance and its manufacturing method | |
| Kumar et al. | Thermal barrier coatings on aluminium-based alloy 2024 for high temperature protection subjected to thermal cyclic loading | |
| JPH04147957A (en) | Heat insulating aluminum-based member | |
| JPS63161150A (en) | Formation of heat insulating thermally sprayed layer | |
| JPS63290254A (en) | Thermally sprayed film combining heat resistance with wear resistance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |