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CN109848407A - Cobalt-chromium-tungsten alloy-coated tantalum carbide powder and preparation method thereof - Google Patents

Cobalt-chromium-tungsten alloy-coated tantalum carbide powder and preparation method thereof Download PDF

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Publication number
CN109848407A
CN109848407A CN201910292753.7A CN201910292753A CN109848407A CN 109848407 A CN109848407 A CN 109848407A CN 201910292753 A CN201910292753 A CN 201910292753A CN 109848407 A CN109848407 A CN 109848407A
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chromium
cobalt
tungsten alloy
tantalum carbide
powder
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程前
陈海*
陈海
范丽
董丽华
尹衍生
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Shanghai Maritime University
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Shanghai Maritime University
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Abstract

The invention discloses a kind of cobalt-chromium-tungsten alloy cladding tantalum carbide powders and preparation method thereof, and this method includes: step 1, respectively mixing the tantalum carbide of the cobalt-chromium-tungsten alloy of 35-42wt.%, 58-65wt.% with ball mill;Step 2, by the method for mist projection granulating be made cobalt-chromium-tungsten alloy coat tantalum carbide pelletizing, 220-240 DEG C of inlet air temperature, 110-130 DEG C of leaving air temp, revolving speed 7000-9000r/min;Step 3, pelletizing is placed in induction plasma spheroidization device, opens plasma;Step 4, powder feeding valve is opened, adjustment argon carrier flow is 3-8slpm, and adjustment powder feeding rate is 160-180g/min;Step 5, it collects and obtains cobalt-chromium-tungsten alloy cladding tantalum carbide powder.Production method of the invention, easy to operate, production cost is low, is easy to industrialize;Gained cobalt-chromium-tungsten alloy cladding carbonization tantalum powder good fluidity, suitable for mass production, with making coatings, being not likely to produce segregation causes to crack, and high temperature resistant, corrosion-resistant, wear-resistant, can be used for plasma transferred arc bead-welding technology or hot-spraying technique, has good commercial value.

Description

A kind of cobalt-chromium-tungsten alloy cladding tantalum carbide powder and preparation method thereof
Technical field
The invention belongs to Surface Engineering fields, are related to a kind of preparation method of tantalum carbide coated powder, specifically with cobalt chromium tungsten Alloy and tantalum carbide are primary raw material, and using induction plasma technique, the excellent cobalt-chromium-tungsten alloy of production performance coats tantalum carbide Powder.
Background technique
Plasma transferred arc bead-welding technology belongs to surface coating technique, its heat source is transfevent plasma arc, using conjunction As filling metal, when built-up welding, melts workpiece surface and resurfacing welding material simultaneously, and two kinds of materials is made to be mutually mixed structure at bronze end At molten bath, molten bath forms overlay cladding through condensation-crystallization.Cobalt-base alloys can be used in filling metal, to improve the corrosion-resistant of cobalt-base alloys And high temperature resistance, chromium is added and tungsten is modified, along with the high rigidity (2123HV0.02) of tantalum carbide, cobalt chromium tungsten is made and closes The tantalum carbide powder of gold cladding, the Overlay of the two can improve the corrosion-and high-temp-resistant abrasion resistance properties of substrate, then pass through Plasma transferred arc bead-welding technology is prepared into composite coating.If tantalum carbide and cobalt-chromium-tungsten alloy are directly carried out mechanical mixture, Due to the density (14.3g/cm of tantalum carbide3) with the density (9.13g/cm of cobalt-chromium-tungsten alloy3) have big difference, cause the two easily to produce Raw segregation, causes coating cracking, influences using chemical property is also not sufficiently stable.
Through the literature search of existing technologies, the Chinese patent of Publication No. CN105642885A discloses a kind of tool There are the thermal spraying self-adhesive metal alloy powders of covered composite yarn structure.This method deficiency is: utilizing mechanical mill alloying side The Mo of method preparation coats Ni20The shell-nuclear compounded structure powder particle of Cr cannot be guaranteed that it is uniformly mixed, and less can guarantee that powder bag is covered Completely, the powder obtained does not have good particle shape and mobility.It has also been found that, Yin Chunlei etc. is in " Chinese powder skill by literature search Art " (2006, the 2nd phase, the 42-44 pages) delivered " nickel coated type composite powder preparation and its answering in field of thermal spray With ", the preparation method of nickel coated type composite powder is reviewed, mainly there is Hydrothermal Pressure Hydrogen Reduction method, electroless plating method, carbonyl nickel decomposition method And galvanoplastic;The nickel coated type composite powder obtained by these types of method has been used widely, but with the change in epoch It moves, the rub resistance abrasion of simple nickel coated type composite powder and corrosion resistance are no longer satisfied scientific and technological progress.
By retrieving existing patent and document, do not find that cobalt-base alloys cladding tantalum carbide powder is made using plasma method Report.
Summary of the invention
Utilize the uneven, unstable of metallic cover powder obtained by mechanical mixture, mechanical scatter bad to overcome Defect, it is an object of the invention to overcome above-mentioned the deficiencies in the prior art, it is simple to provide a kind of production method, prepares hardness The method of high, wear-resistant, corrosion-resistant, high temperature resistant and finely dispersed cobalt-base alloys cladding tantalum carbide powder.
In order to achieve the above object, the present invention provides a kind of cobalt-chromium-tungsten alloy cladding tantalum carbide powder preparation method, It includes:
Step 1, cobalt-chromium-tungsten alloy, tantalum carbide are mixed with ball mill respectively, cobalt-chromium-tungsten alloy accounts for 35-42%, tantalum carbide Account for 58-65%;Wherein, the above percentage is by weight percentage;
Step 2, the pelletizing that cobalt-chromium-tungsten alloy coats tantalum carbide, inlet air temperature 220- are made by the method for mist projection granulating 240 DEG C, 110-130 DEG C of leaving air temp, revolving speed 7000-9000r/min;
Step 3, pelletizing is placed in induction plasma spheroidization device, opens plasma;
Step 4, powder feeding valve is opened, adjustment argon carrier flow is 3-8slpm, and adjustment powder feeding rate is 160-180g/ min;
Step 5, it collects and obtains cobalt-chromium-tungsten alloy cladding tantalum carbide powder.
Preferably, the granularity of the cobalt-chromium-tungsten alloy is 1 μm -3 μm.
Preferably, the content of cobalt is 50%~58% in the cobalt-chromium-tungsten alloy, the content of chromium is 28%~30%, The content of tungsten is 4%~12%, and the content of nickel is 2%~10%, and the above percentage is by weight percentage.
Preferably, the granularity of the tantalum carbide is 45 μm -125 μm.
Preferably, in step 1, ball milling speed 150-350r/min, time 1-5h.
Preferably, the ball mill is omnidirectional planetary ball mill.
Preferably, in step 3, the operating parameter of plasma are as follows: argon gas shield gas flow rate is 70-90slpm, argon gas Center gas flow is 20-40slpm, hydrogen flowing quantity 15-19slpm.More preferably, argon gas shield gas flow rate is 80slpm, Argon gas center gas flow is 30slpm, hydrogen flowing quantity 17slpm.
Preferably, argon carrier flow is 5slpm.
The present invention also provides a kind of cobalt-chromium-tungsten alloys prepared according to above-mentioned method to coat tantalum carbide powder, the cobalt chromium Tungsten alloy cladding tantalum carbide powder is spherical in shape, and granularity is 45 μm -150 μm.
To overcome in the prior art, by the metallic cover powder of mechanical mixture, that there are mechanical dispersions is bad, mixing is uneven The defects of.The present invention selects cobalt-chromium-tungsten alloy powder to coat tantalum carbide powder: first, cobalt-chromium-tungsten alloy is one in stellite Kind, stellite is a kind of hard alloy for being resistant to various types abrasion and corrosion and high-temperature oxydation.The hardness of tantalum carbide (2123HV0.02) is greatly compared with common tungsten carbide (HV1200), more resistant.The present invention is using cobalt-chromium-tungsten alloy cladding carbonization The composite powder of tantalum had both maintained good resistance to various types abrasion and corrosion and the high temperature oxidation resistance of cobalt-chromium-tungsten alloy, Its hardness is improved again.Second, tantalum carbide powder is coated using cobalt-chromium-tungsten alloy made from plasma method, compared with mechanical mixture Powdered ingredients it is more uniform, between tantalum carbide and cobalt-chromium-tungsten alloy have maximum contact surface, be conducive to tantalum carbide and The combination of two-phase between cobalt-chromium-tungsten alloy;Meanwhile cobalt-chromium-tungsten alloy clad plays good guarantor to tantalum carbide core powder Shield effect.
The present invention, also by spray granulation, utilizes cobalt-chromium-tungsten alloy and carbonization before through plasma spheroidization technique The different melting points of tantalum, by cobalt-chromium-tungsten alloy, (ingredient of this alloy contains a small amount of nickel, molybdenum, silicon, the alloys such as carbon, niobium, tantalum member Element) fluidization, atomization, it is applied to the granulation of fluidized particles (tantalum carbide) surface, realizes that cobalt-chromium-tungsten alloy to the cladding of tantalum carbide, leads to The mixed powder of cladding process production is crossed, two combine stabilization, are not likely to produce segregation.The ingredient of cladding powder is uniform, every cobalt Chromium tungsten alloy cladding tantalum carbide powder is all uniform by core powder tantalum carbide and surrounding and complete clad cobalt-chromium-tungsten alloy It is formed, and will not be segregated in storage, transport and use process, ensure that the uniform of cobalt-chromium-tungsten alloy and tantalum carbide Unanimously.
The production method of cobalt-chromium-tungsten alloy cladding tantalum carbide powder provided by the invention, easy to operate, production cost is low, easily In industrialization;Gained cobalt-chromium-tungsten alloy cladding carbonization tantalum powder good fluidity, it is suitable for mass production, with making coatings, it is not likely to produce partially Analysis causes to crack, and high temperature resistant, corrosion-resistant, wear-resistant, can be used for plasma transferred arc bead-welding technology or hot-spraying technique, has Good commercial value.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below Close the embodiment of the present invention to elaborate: the present embodiment is implemented under the premise of the technical scheme of the present invention, gives Detailed embodiment and process, but protection scope of the present invention is not limited to following embodiments.
Embodiment 1
Step 1,1 μm -3 μm of granularity of cobalt-chromium-tungsten alloy, 45 μm -125 μm of granularity of tantalum carbide are mixed with ball mill respectively It closes, cobalt-chromium-tungsten alloy accounts for 40%, and tantalum carbide accounts for 60%, ball milling speed 350r/min, time 1h;
Step 2, making for cobalt-chromium-tungsten alloy cladding tantalum carbide is made using the method for mist projection granulating in the resulting powder of step 1 Grain powder, 230 DEG C of inlet air temperature, 110 DEG C of leaving air temp, revolving speed 8000r/min;
Step 3, pelletizing is put into induction plasma spheroidization device, opens plasma, and plasma is set Operating parameter: argon gas shield gas flow rate be 80slpm (stard liter per minute, standard liters per minute flow Value), argon gas center gas flow is 30slpm, hydrogen flowing quantity 17slpm;
Step 4, powder feeding valve is opened, adjustment argon carrier flow is 5slpm, and adjustment powder feeding rate is 160g/min;
Step 5, collect gained powder, obtain cobalt-chromium-tungsten alloy cladding tantalum carbide powder, gained powder size 45 μm- 150μm;
Oxygen potential through measuring gained cobalt-chromium-tungsten alloy cladding tantalum carbide is 95%, and Hall flow velocity is 8.7 (s/50g).
Embodiment 2
Step 1,1 μm -3 μm of granularity of cobalt-chromium-tungsten alloy, 45 μm -125 μm of granularity of tantalum carbide are mixed with ball mill respectively It closes, cobalt-chromium-tungsten alloy accounts for 40%, and tantalum carbide accounts for 60%, ball milling speed 150r/min, time 3h;
Step 2, making for cobalt-chromium-tungsten alloy cladding tantalum carbide is made using the method for mist projection granulating in the resulting powder of step 1 Grain powder, 220 DEG C of inlet air temperature, 130 DEG C of leaving air temp, revolving speed 8000r/min;
Step 3, pelletizing is put into induction plasma spheroidization device, opens plasma, and plasma is set Operating parameter: argon gas shield gas flow rate be 80slpm (stard liter per minute, standard liters per minute flow Value), argon gas center gas flow is 30slpm, hydrogen flowing quantity 17slpm;
Step 4, powder feeding valve is opened, adjustment argon carrier flow is 5slpm, and adjustment powder feeding rate is 170g/min;
Step 5, gained powder is collected, cobalt-chromium-tungsten alloy cladding tantalum carbide powder is obtained;
Oxygen potential through measuring gained cobalt-chromium-tungsten alloy cladding tantalum carbide is 97%, and Hall flow velocity is 9.6 (s/50g).
Embodiment 3
Step 1,1 μm -3 μm of granularity of cobalt-chromium-tungsten alloy, 45 μm -125 μm of granularity of tantalum carbide are mixed with ball mill respectively It closes, cobalt-chromium-tungsten alloy accounts for 40%, and tantalum carbide accounts for 60%, ball milling speed 250r/min, time 5h;
Step 2, making for cobalt-chromium-tungsten alloy cladding tantalum carbide is made using the method for mist projection granulating in the resulting powder of step 1 Grain powder, 240 DEG C of inlet air temperature, 120 DEG C of leaving air temp, revolving speed 8000r/min.
Step 3, pelletizing is put into induction plasma spheroidization device, opens plasma, and plasma is set Operating parameter: argon gas shield gas flow rate be 80slpm (stard liter per minute, standard liters per minute flow Value), argon gas center gas flow is 30slpm, hydrogen flowing quantity 17slpm;
Step 4, powder feeding valve is opened, adjustment argon carrier flow is 5slpm, and adjustment powder feeding rate is 180g/min;
Step 5, gained powder is collected, cobalt-chromium-tungsten alloy cladding tantalum carbide powder is obtained;
Oxygen potential through measuring gained cobalt-chromium-tungsten alloy cladding tantalum carbide is 99%, and Hall flow velocity is 10.3 (s/50g).
In conclusion the present invention makes cobalt-chromium-tungsten alloy coat tantalum carbide using mist projection granulating, then through plasma method nodularization Cobalt-chromium-tungsten alloy is made and coats tantalum carbide powder.Compared with the powder of mechanical mixture, cobalt-chromium-tungsten alloy carbon coated of the invention Change in tantalum powder, there is maximum contact surface between tantalum carbide and cobalt-chromium-tungsten alloy, be conducive to tantalum carbide and cobalt-chromium-tungsten alloy Between two-phase combination;Meanwhile cobalt-chromium-tungsten alloy clad plays good protective effect to tantalum carbide core powder.And And cobalt-chromium-tungsten alloy cladding carbonization tantalum powder good fluidity of the invention, it is suitable for mass production, with making coatings, it is not likely to produce segregation Cause to crack, and high temperature resistant, it is corrosion-resistant, it is wear-resistant, it can be used for plasma transferred arc bead-welding technology or hot-spraying technique, have good Good commercial value.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.

Claims (10)

1.一种钴铬钨合金包覆碳化钽粉体的制备方法,其特征在于,该方法包含:1. a preparation method of cobalt-chromium-tungsten alloy coating tantalum carbide powder, is characterized in that, this method comprises: 步骤1,分别将钴铬钨合金、碳化钽用球磨机混合,钴铬钨合金占35-42%,碳化钽占58-65%;其中,以上百分比均以重量百分数计;In step 1, the cobalt-chromium-tungsten alloy and the tantalum carbide are respectively mixed with a ball mill, the cobalt-chromium-tungsten alloy accounts for 35-42%, and the tantalum carbide accounts for 58-65%; wherein, the above percentages are all in weight percentages; 步骤2,通过喷雾造粒的方法制成钴铬钨合金包覆碳化钽的造粒粉,进风温度220-240℃,出风温度110-130℃,转速7000-9000r/min;In step 2, the granulated powder of cobalt-chromium-tungsten alloy-coated tantalum carbide is prepared by the method of spray granulation. 步骤3,将造粒粉置入感应等离子体球化装置,开启等离子体;Step 3, put the granulated powder into the induction plasma spheroidizing device, and turn on the plasma; 步骤4,打开送粉阀门,调整氩气载气流量为3-8slpm,调整送粉速率为160-180g/min;Step 4, open the powder feeding valve, adjust the argon carrier gas flow to 3-8 slpm, and adjust the powder feeding rate to 160-180 g/min; 步骤5,收集得到钴铬钨合金包覆碳化钽粉末。In step 5, the cobalt-chromium-tungsten alloy-coated tantalum carbide powder is collected. 2.如权利要求1所述的钴铬钨合金包覆碳化钽粉体的制备方法,其特征在于,所述的钴铬钨合金的粒度为1μm-3μm。2 . The method for preparing cobalt-chromium-tungsten alloy-coated tantalum carbide powder according to claim 1 , wherein the particle size of the cobalt-chromium-tungsten alloy is 1 μm-3 μm. 3 . 3.如权利要求1所述的钴铬钨合金包覆碳化钽粉体的制备方法,其特征在于,所述的钴铬钨合金中,钴的含量是50%~58%,铬的含量是28%~30%,钨的含量是4%~12%,镍的含量是2%~10%,以上百分比均以重量百分数计。3. The method for preparing cobalt-chromium-tungsten alloy-coated tantalum carbide powder according to claim 1, wherein in the cobalt-chromium-tungsten alloy, the content of cobalt is 50% to 58%, and the content of chromium is 28% to 30%, the content of tungsten is 4% to 12%, the content of nickel is 2% to 10%, and the above percentages are all in weight percentages. 4.如权利要求1所述的钴铬钨合金包覆碳化钽粉体的制备方法,其特征在于,所述的碳化钽的粒度为45μm-125μm。4 . The method for preparing cobalt-chromium-tungsten alloy-coated tantalum carbide powder according to claim 1 , wherein the particle size of the tantalum carbide is 45 μm-125 μm. 5 . 5.如权利要求1所述的钴铬钨合金包覆碳化钽粉体的制备方法,其特征在于,步骤1中,球磨速度为150-350r/min,时间为1-5h。5. The method for preparing cobalt-chromium-tungsten alloy-coated tantalum carbide powder according to claim 1, wherein in step 1, the ball milling speed is 150-350r/min, and the time is 1-5h. 6.如权利要求1所述的钴铬钨合金包覆碳化钽粉体的制备方法,其特征在于,步骤1中,所述的球磨机为全方位行星式球磨机。6 . The method for preparing cobalt-chromium-tungsten alloy-coated tantalum carbide powder according to claim 1 , wherein, in step 1, the ball mill is an omnidirectional planetary ball mill. 7 . 7.如权利要求1所述的钴铬钨合金包覆碳化钽粉体的制备方法,其特征在于,步骤3中,等离子体的运行参数为:氩气保护气体流量为70-90slpm,氩气中心气体流量为20-40slpm,氢气流量为15-19slpm。7. The method for preparing cobalt-chromium-tungsten alloy-coated tantalum carbide powder as claimed in claim 1, wherein in step 3, the operating parameters of the plasma are: argon protective gas flow rate is 70-90slpm, argon gas The central gas flow is 20-40slpm and the hydrogen flow is 15-19slpm. 8.如权利要求7所述的钴铬钨合金包覆碳化钽粉体的制备方法,其特征在于,步骤3中,等离子体的运行参数为:氩气保护气体流量为80slpm,氩气中心气体流量为30slpm,氢气流量为17slpm。8. The method for preparing cobalt-chromium-tungsten alloy-coated tantalum carbide powder as claimed in claim 7, wherein in step 3, the operating parameters of the plasma are: the flow rate of the argon shielding gas is 80slpm, and the argon central gas is 80 slpm. The flow was 30 slpm and the hydrogen flow was 17 slpm. 9.如权利要求1所述的钴铬钨合金包覆碳化钽粉体的制备方法,其特征在于,步骤4中,氩气载气流量为5slpm。9 . The method for preparing cobalt-chromium-tungsten alloy-coated tantalum carbide powder according to claim 1 , wherein in step 4, the argon carrier gas flow rate is 5slpm. 10 . 10.一种根据权利要求1-9中任意一项所述的方法制备的钴铬钨合金包覆碳化钽粉体,其特征在于,所述的钴铬钨合金包覆碳化钽粉末呈球形,粒度为45μm-150μm。10. A cobalt-chromium-tungsten alloy-coated tantalum carbide powder prepared by the method according to any one of claims 1-9, wherein the cobalt-chromium-tungsten alloy-coated tantalum carbide powder is spherical, The particle size is 45μm-150μm.
CN201910292753.7A 2019-04-12 2019-04-12 Cobalt-chromium-tungsten alloy-coated tantalum carbide powder and preparation method thereof Pending CN109848407A (en)

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Cited By (4)

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CN114394604A (en) * 2022-01-20 2022-04-26 上海海事大学 A kind of preparation method of superhard spherical tungsten boride powder
CN114394604B (en) * 2022-01-20 2024-04-02 上海海事大学 A method for preparing superhard spherical tungsten boride powder
CN115889769A (en) * 2022-11-24 2023-04-04 河海大学 A core-shell structure ceramic@medium entropy alloy composite powder for ultra-high-speed laser cladding and its coating, preparation method and application
CN115889769B (en) * 2022-11-24 2025-01-28 河海大学 A core-shell structure ceramic@medium entropy alloy composite powder for ultra-high-speed laser cladding and its coating, preparation method and application

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