CN102744366A - Preparation method of titanium aluminium-based and niobium silicon-based alloy directional solidification investment precision casting mold shell - Google Patents
Preparation method of titanium aluminium-based and niobium silicon-based alloy directional solidification investment precision casting mold shell Download PDFInfo
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- CN102744366A CN102744366A CN201210209569XA CN201210209569A CN102744366A CN 102744366 A CN102744366 A CN 102744366A CN 201210209569X A CN201210209569X A CN 201210209569XA CN 201210209569 A CN201210209569 A CN 201210209569A CN 102744366 A CN102744366 A CN 102744366A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 54
- 239000000956 alloy Substances 0.000 title claims abstract description 22
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 22
- 238000007711 solidification Methods 0.000 title claims abstract description 18
- 230000008023 solidification Effects 0.000 title claims abstract description 18
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 239000004411 aluminium Substances 0.000 title claims abstract description 15
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 239000010936 titanium Substances 0.000 title claims abstract description 15
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 15
- 238000005495 investment casting Methods 0.000 title claims abstract description 13
- LIZIAPBBPRPPLV-UHFFFAOYSA-N niobium silicon Chemical compound [Si].[Nb] LIZIAPBBPRPPLV-UHFFFAOYSA-N 0.000 title abstract 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000005245 sintering Methods 0.000 claims abstract description 28
- 239000011230 binding agent Substances 0.000 claims abstract description 21
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 8
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 8
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 8
- 238000000926 separation method Methods 0.000 claims description 38
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 36
- 239000000843 powder Substances 0.000 claims description 36
- 239000004576 sand Substances 0.000 claims description 24
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 18
- 238000009415 formwork Methods 0.000 claims description 13
- 229910052758 niobium Inorganic materials 0.000 claims description 13
- 239000010955 niobium Substances 0.000 claims description 13
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 13
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 12
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 229920000609 methyl cellulose Polymers 0.000 claims description 7
- 239000001923 methylcellulose Substances 0.000 claims description 7
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000292 calcium oxide Substances 0.000 claims description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000002242 deionisation method Methods 0.000 claims description 6
- 239000000395 magnesium oxide Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 239000004408 titanium dioxide Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000080 wetting agent Substances 0.000 claims description 6
- 229910052845 zircon Inorganic materials 0.000 claims description 6
- 229910052726 zirconium Inorganic materials 0.000 claims description 6
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 6
- 239000002002 slurry Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 4
- 239000012535 impurity Substances 0.000 abstract description 2
- 239000011819 refractory material Substances 0.000 abstract description 2
- 230000035939 shock Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 230000003014 reinforcing effect Effects 0.000 abstract 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 abstract 1
- 239000000654 additive Substances 0.000 abstract 1
- 230000000996 additive effect Effects 0.000 abstract 1
- 239000001768 carboxy methyl cellulose Substances 0.000 abstract 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 abstract 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 230000007774 longterm Effects 0.000 abstract 1
- 238000003860 storage Methods 0.000 abstract 1
- 230000004888 barrier function Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 235000006708 antioxidants Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
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- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention belongs to the technical field of investment precision casting mold shells, and particularly relates to a preparation method of a titanium aluminium-based and niobium silicon-based alloy directional solidification investment precision casting mold shell. The invention adopts polyvinyl alcohol, polyethylene glycol, and carboxymethyl cellulose as isolating layer binders, and adopts yttrium oxide and zirconia as refractory materials for the high-temperature inert isolating layer and a reinforcing layer. According to the invention, the high-temperature heat-isolating layer binder and the high-temperature inert isolating layer slurry have good coating performance with a wax pattern; the slurry has stable performance, and is suitable for long-term storage. After high temperature sintering, the high-temperature inert isolating layer binder volatilizes, and does not generate any impurity elements which reduce the mold shell inertia. With the addition of a sintering additive and the process combination of the high-temperature inert isolating layer and the reinforcing layer, the mold shell has the characteristics of good high-temperature resistance and thermal shock stability and high chemical stability, can bear a high temperature of about 2000 DEG C withouth deformation, does not crack under a condition with a large temperature gradient of directional solidification; and the prepared directional solidification cast has high dimension precision and an ultrathin surface pollution layer.
Description
Technical field
The invention belongs to precision-investment casting formwork technical field, be specifically related to the preparation method of the aluminium base and niobium silicon-base alloy directional solidification investment pattern precision casting formwork of titanium.
Background technology
Titanium aluminium base alloy and niobium silicon-base alloy are good structural materials, have density is little, specific strength is high, corrosion resistance is good, good creep resistant and characteristics such as anti-oxidant, are widely used in aerospace field.But the bottleneck that hinders its large-scale application is its temperature-room type plasticity and unworkability.
Precision-investment casting is suitable for making, not having allowance and be difficult to mach complex component in batches as a kind of technology of producing complex-shaped, near clean shape structural member.
Directional solidification is the control that utilizes when solidifying hot conduction orientation; In frozen metal and solidified melt not, set up the thermograde of specific direction, reach the control crystal orientation, eliminate horizontal crystal boundary; Improve room-temperature mechanical property, improve its plasticity, fracture toughness and creep-resistant property.
Directional solidification technique can greatly improve performances such as the temperature-room type plasticity, fracture toughness, creep strength of titanium aluminium base alloy and niobium silicon-base alloy; For a new road has been opened up in the foundry goods preparation, for the application of titanium aluminium base alloy and niobium silicon-base alloy directional solidification product from now on provides wide prospect.
Titanium aluminium base alloy and niobium silicon-base alloy specific activity are bigger, react with the corundum formwork with high temperature alloy orientation and single crystal blade commonly used at present easily, make the surface of foundry goods form pollution layer, worsen casting quality, influence the mechanical property of foundry goods.
Summary of the invention
For solving titanium aluminium base alloy and the niobium silicon-base alloy INTERACTION PROBLEMS between high-temperature molten metal liquid and formwork in the directional solidification process, the present invention proposes a kind of preparation method who is suitable for titanium aluminium base alloy and niobium silicon-base alloy directional solidification precision-investment casting formwork.
Technical solution of the present invention is that preparation process is following:
1) separation layer binding agent (A) preparation: with one or more and deionization pure water in polyethylene glycol, polyvinyl alcohol or the methylcellulose that contracts by mass ratio 0.1:1～0.5:1 mixing and stirring; Fully dissolving, adding moistened surface agent and sintering aid are subsequent use;
2) slip preparation: preparation separation layer slip, pour the yittrium oxide powder in the separation layer binding agent into, fully mix, stir, the powder liquor ratio is 4:1～8:1; Preparation back-up coat slip mixes yittrium oxide powder and zirconium colloidal sol by powder liquor ratio 3:1～8:1, fully stir subsequent use;
3) separation layer preparation: be coated with the separation layer slip and hang on the wax pattern part, spread yttrium oxide sand, dry 12～48 hours; Repeat aforesaid operations and form separation layer 2～4 times;
4) back-up coat preparation: after the separation layer preparation is accomplished, be coated with and hang the back-up coat slip, spread oxidation zircon sand, dry 8～36 hours; Repeat aforesaid operations 4～7 times, then, be coated with again and hang one deck back-up coat slip, dry 24～48 hours;
5) wax pattern removes, high temperature sintering.
The wetting agent that adds in the said separation layer adhesive preparation is 0.02 of binding agent gross mass～0.1 ‰; Sintering aid is one or more the mixture in calcium oxide, magnesia, silica, aluminium oxide, the titanium dioxide, and addition is 0.1～1% of a binding agent gross mass.
Said separation layer slip flow cup viscosity is 30～110s, and yittrium oxide powder degree is 200～500 orders; Said back-up coat slip flow cup viscosity is 20～90s, and the zirconia powder granularity is 200～400 orders.
Yttrium oxide sand granularity in the said separation layer preparation is 30～150 orders, and the zirconia fineness of sand in the said back-up coat preparation is 20～110 orders, and dry environment is 20～26 ℃ of temperature, relative humidity 30～90%.
Shell after said wax pattern removes is sintering under 1000～1900 ℃ high temperature, is incubated 4～6 hours, and cool to room temperature is come out of the stove.
Advantage that the present invention has and beneficial effect: the present invention utilizes polyvinyl alcohol, polyethylene glycol, the methylcellulose that contracts etc. is used as the separation layer binding agent, is used as the refractory material of high temperature inert separation layer and back-up coat with yittrium oxide, zirconia etc.The invention has the advantages that (1) high temperature insulating layer binder abundant raw materials, cheap, nontoxic pollution-free.(2) screening characteristics between high temperature inert separation layer slip and wax pattern is better, and the slip stable performance is easy to long preservation.(3) high temperature inert separation layer binding agent volatilization behind the high temperature sintering does not produce the impurity element that reduces the formwork inertia.(4) process combination of the interpolation of sintering aid and high temperature inert separation layer and back-up coat makes formwork that the characteristics of high temperature resistant, anti-thermal shock good stability, high chemical stability arranged; Can bear high temperature about 2000 ℃ and indeformable; Under the condition under the big thermograde of directional solidification, do not ftracture; The directional solidification castings dimensional accuracy of preparing is high, and surface contamination layer as thin as a wafer.
The present invention is mainly used in preparation Aero-Space engine and combustion machine blade field, has important application and wide application market.
The specific embodiment
1) inert barriers adhesive preparation: with one or more and deionization pure water in polyethylene glycol, polyvinyl alcohol or the methylcellulose that contracts by mass ratio 0.1:1～0.5:1 mixing and stirring, fully dissolving, it is subsequent use to add moistened surface agent and sintering aid.
2) slip preparation: prepare high temperature inert separation layer slip, fully mix in pouring the yittrium oxide powder into, stir, the powder liquor ratio is 4:1～8:1; Preparation back-up coat slip mixes zirconia powder and zirconium colloidal sol by powder liquor ratio 3:1～8:1, fully stir subsequent use.
3) high temperature inert separation layer preparation: be coated with slip and hang on the wax-pattern spare, spread yttrium oxide sand, dry 12～48 hours; Repeat aforesaid operations and form the high temperature inert separation layer 2～4 times.
4) back-up coat preparation: be coated with the bridging slurry after step 3) is accomplished, spread oxidation zircon sand, dry 8～36 hours; Repeat aforesaid operations 4～7 times, and then be coated with bridging slurry, dry 24～48 hours.
5) wax pattern removes, high temperature sintering.
The wetting agent that adds in the said step 1) is 0.02 of binding agent gross mass～0.1 ‰, and sintering aid is one or more the mixture in calcium oxide, magnesia, silica, aluminium oxide, the titanium dioxide, and addition is 0.1～1% of a binding agent gross mass.
Said step 2) separation layer slip flow cup viscosity is 30～110s in, and yittrium oxide powder degree is 200～500 orders; Slip flow cup viscosity is 20～90s, and the zirconia powder granularity is 200～400 orders.
Said step 3) and 4) the yttrium oxide sand granularity is 30～150 orders in, and the zirconia fineness of sand is 20～110 orders, and dry environment is 20～26 ℃ of temperature, relative humidity 30～90%.
Shell after wax pattern removes in said step 5) sintering under 1000～1900 ℃ high temperature is incubated 4～6 hours, and cool to room temperature is come out of the stove.
Embodiment one
1) inert barriers adhesive preparation: with one or more and deionization pure water in polyethylene glycol, polyvinyl alcohol or the methylcellulose that contracts by mass ratio 0.2:1 mixing and stirring, fully dissolving, it is subsequent use to add moistened surface agent and sintering aid.
2) slip preparation: prepare high temperature inert separation layer slip, fully mix in pouring the yittrium oxide powder into, stir, the powder liquor ratio is 4:1～8:1; Preparation back-up coat slip mixes zirconia powder and zirconium colloidal sol by powder liquor ratio 3:1～8:1, fully stir subsequent use.
3) high temperature inert separation layer preparation: be coated with slip and hang on the wax-pattern spare, spread yttrium oxide sand, dry 12～48 hours; Repeat aforesaid operations and form the high temperature inert separation layer 2～4 times.
4) back-up coat preparation: be coated with the bridging slurry after step 3) is accomplished, spread oxidation zircon sand, dry 8～36 hours; Repeat aforesaid operations 4～7 times, and then be coated with bridging slurry, dry 24～48 hours.
5) wax pattern removes, high temperature sintering.
The wetting agent that adds in the step 1) is 0.02 of binding agent gross mass～0.1 ‰, and sintering aid is one or more the mixture in calcium oxide, magnesia, silica, aluminium oxide, the titanium dioxide, and addition is 0.1～0.4% of a binding agent gross mass.
Step 2) slip (B) flow cup viscosity is 30～110s in, and yittrium oxide powder degree is 200～500 orders; Slip (C) flow cup viscosity is 20～90s, and the zirconia powder granularity is 200～400 orders.
Step 3) and 4) the yttrium oxide sand granularity is 30～150 orders in, and the zirconia fineness of sand is 20～110 orders, and dry environment is 20～26 ℃ of temperature, relative humidity 30～90%.
Shell after wax pattern removes in the step 5) is sintering under 1100 ℃ high temperature, is incubated 4～6 hours, and cool to room temperature is come out of the stove.
Embodiment two
1) inert barriers adhesive preparation: with one or more and deionization pure water in polyethylene glycol, polyvinyl alcohol or the methylcellulose that contracts by mass ratio 0.3:1 mixing and stirring, fully dissolving, it is subsequent use to add moistened surface agent and sintering aid.
2) slip preparation: prepare high temperature inert separation layer slip, fully mix in pouring the yittrium oxide powder into, stir, the powder liquor ratio is 4:1～8:1; Preparation back-up coat slip mixes zirconia powder and zirconium colloidal sol by powder liquor ratio 3:1～8:1, fully stir subsequent use.
3) high temperature inert separation layer preparation: be coated with slip and hang on the wax-pattern spare, spread yttrium oxide sand, dry 12～48 hours; Repeat aforesaid operations and form the high temperature inert separation layer 2～4 times.
4) back-up coat preparation: be coated with the bridging slurry after step 3) is accomplished, spread oxidation zircon sand, dry 8～36 hours; Repeat aforesaid operations 4～7 times, and then be coated with bridging slurry, dry 24～48 hours.
5) wax pattern removes, high temperature sintering.
The wetting agent that adds in the step 1) is 0.02 of binding agent gross mass～0.1 ‰, and sintering aid is one or more the mixture in calcium oxide, magnesia, silica, aluminium oxide, the titanium dioxide, and addition is 0.1～0.4% of a binding agent gross mass.
Step 2) slip (B) flow cup viscosity is 30～110s in, and yittrium oxide powder degree is 200～500 orders; Slip (C) flow cup viscosity is 20～90s, and the zirconia powder granularity is 200～400 orders.
Step 3) and 4) the yttrium oxide sand granularity is 30～150 orders in, and the zirconia fineness of sand is 20～110 orders, and dry environment is 20～26 ℃ of temperature, relative humidity 30～90%.
Shell after wax pattern removes in the step 5) is sintering under 1600 ℃ high temperature, is incubated 4～6 hours, and cool to room temperature is come out of the stove.
Embodiment three
1) inert barriers adhesive preparation: with one or more and deionization pure water in polyethylene glycol, polyvinyl alcohol or the methylcellulose that contracts by mass ratio 0.4:1 mixing and stirring, fully dissolving, it is subsequent use to add moistened surface agent and sintering aid.
2) slip preparation: prepare high temperature inert separation layer slip, fully mix in pouring the yittrium oxide powder into, stir, the powder liquor ratio is 4:1～8:1; Preparation back-up coat slip mixes zirconia powder and zirconium colloidal sol by powder liquor ratio 3:1～8:1, fully stir subsequent use.
3) high temperature inert separation layer preparation: be coated with slip and hang on the wax-pattern spare, spread yttrium oxide sand, dry 12～48 hours; Repeat aforesaid operations and form the high temperature inert separation layer 2～4 times.
4) back-up coat preparation: be coated with the bridging slurry after step 3) is accomplished, spread oxidation zircon sand, dry 8～36 hours; Repeat aforesaid operations 4～7 times, and then be coated with bridging slurry, dry 24～48 hours.
5) wax pattern removes, high temperature sintering.
The wetting agent that adds in the step 1) is 0.02 of binding agent gross mass～0.1 ‰, and sintering aid is one or more the mixture in calcium oxide, magnesia, silica, aluminium oxide, the titanium dioxide, and addition is 0.1～0.4% of a binding agent gross mass.
Step 2) slip (B) flow cup viscosity is 30～110s in, and yittrium oxide powder degree is 200～500 orders; Slip (C) flow cup viscosity is 20～90s, and the zirconia powder granularity is 200～400 orders.
Step 3) and 4) the yttrium oxide sand granularity is 30～150 orders in, and the zirconia fineness of sand is 20～110 orders, and dry environment is 20～26 ℃ of temperature, relative humidity 30～90%.
Shell after wax pattern removes in the step 5) is sintering under 1700 ℃ high temperature, is incubated 4～6 hours, and cool to room temperature is come out of the stove.
Claims (5)
1. the preparation method of the aluminium base and niobium silicon-base alloy directional solidification investment pattern precision casting formwork of titanium is characterized in that preparation process is following:
1) separation layer adhesive preparation: with one or more and deionization pure water in polyethylene glycol, polyvinyl alcohol or the methylcellulose that contracts by mass ratio 0.1:1～0.5:1 mixing and stirring, fully dissolving, it is subsequent use to add moistened surface agent and sintering aid;
2) slip preparation: preparation separation layer slip, pour the yittrium oxide powder in the separation layer binding agent into, fully mix, stir, the powder liquor ratio is 4:1～8:1; Preparation back-up coat slip mixes yittrium oxide powder and zirconium colloidal sol by powder liquor ratio 3:1～8:1, fully stir subsequent use;
3) separation layer preparation: be coated with the separation layer slip and hang on the wax pattern part, spread yttrium oxide sand, dry 12～48 hours; Repeat aforesaid operations and form separation layer 2～4 times;
4) back-up coat preparation: after the separation layer preparation is accomplished, be coated with and hang the back-up coat slip, spread oxidation zircon sand, dry 8～36 hours; Repeat aforesaid operations 4～7 times, then, be coated with again and hang one deck back-up coat slip, dry 24～48 hours;
5) wax pattern removes, high temperature sintering.
2. the preparation method of and niobium silicon-base alloy directional solidification investment pattern precision casting formwork aluminium base according to titanium described in the claim 1; It is characterized in that; The wetting agent that adds in the separation layer adhesive preparation is 0.02 of binding agent gross mass～0.1 ‰; Sintering aid is one or more the mixture in calcium oxide, magnesia, silica, aluminium oxide, the titanium dioxide, and addition is 0.1～1% of a binding agent gross mass.
3. the preparation method of and niobium silicon-base alloy directional solidification investment pattern precision casting formwork aluminium base according to titanium described in the claim 1 is characterized in that said separation layer slip flow cup viscosity is 30～110s, and yittrium oxide powder degree is 200～500 orders; Said back-up coat slip flow cup viscosity is 20～90s, and the zirconia powder granularity is 200～400 orders.
4. the preparation method of and niobium silicon-base alloy directional solidification investment pattern precision casting formwork aluminium base according to titanium described in the right 1; It is characterized in that; Yttrium oxide sand granularity in the said separation layer preparation is 30～150 orders; Zirconia fineness of sand in the said back-up coat preparation is 20～110 orders, and dry environment is 20～26 ℃ of temperature, relative humidity 30～90%.
5. the preparation method of and niobium silicon-base alloy directional solidification investment pattern precision casting formwork aluminium base according to titanium described in the claim 1 is characterized in that the sintering under 1000～1900 ℃ high temperature of the shell after said wax pattern removes is incubated 4～6 hours, and cool to room temperature is come out of the stove.
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| CN103537620A (en) * | 2013-09-30 | 2014-01-29 | 中国航空工业集团公司北京航空材料研究院 | Preparation method for precision casting of mold shell through directional solidification investment casting of titanium-aluminum based alloy |
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| CN111360193A (en) * | 2018-12-26 | 2020-07-03 | 江苏集萃先进金属材料研究所有限公司 | Surface layer inert composite slurry for investment casting and preparation method thereof |
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| CN111360193A (en) * | 2018-12-26 | 2020-07-03 | 江苏集萃先进金属材料研究所有限公司 | Surface layer inert composite slurry for investment casting and preparation method thereof |
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