CN109848407A - A kind of cobalt-chromium-tungsten alloy cladding tantalum carbide powder and preparation method thereof - Google Patents
A kind of cobalt-chromium-tungsten alloy cladding tantalum carbide powder and preparation method thereof Download PDFInfo
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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
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. a kind of preparation method of cobalt-chromium-tungsten alloy cladding tantalum carbide powder, which is characterized in that this method includes:
Step 1, cobalt-chromium-tungsten alloy, tantalum carbide are mixed with ball mill respectively, cobalt-chromium-tungsten alloy accounts for 35-42%, and tantalum carbide accounts 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 220-240 are made by the method for mist projection granulating
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.
2. the preparation method of cobalt-chromium-tungsten alloy cladding tantalum carbide powder as described in claim 1, which is characterized in that the cobalt
The granularity of chromium tungsten alloy is 1 μm -3 μm.
3. the preparation method of cobalt-chromium-tungsten alloy cladding tantalum carbide powder as described in claim 1, which is characterized in that the cobalt
In chromium tungsten alloy, the content of cobalt is 50%~58%, and the content of chromium is 28%~30%, and the content of tungsten is 4%~12%, nickel
Content is 2%~10%, and the above percentage is by weight percentage.
4. the preparation method of cobalt-chromium-tungsten alloy cladding tantalum carbide powder as described in claim 1, which is characterized in that the carbon
The granularity for changing tantalum is 45 μm -125 μm.
5. the preparation method of cobalt-chromium-tungsten alloy cladding tantalum carbide powder as described in claim 1, which is characterized in that in step 1,
Ball milling speed is 150-350r/min, time 1-5h.
6. the preparation method of cobalt-chromium-tungsten alloy cladding tantalum carbide powder as described in claim 1, which is characterized in that in step 1,
The ball mill is omnidirectional planetary ball mill.
7. the preparation method of cobalt-chromium-tungsten alloy cladding tantalum carbide powder as described in claim 1, which is characterized in that in step 3,
The operating parameter of plasma are as follows: argon gas shield gas flow rate is 70-90slpm, and argon gas center gas flow is 20-40slpm,
Hydrogen flowing quantity is 15-19slpm.
8. the preparation method of cobalt-chromium-tungsten alloy cladding tantalum carbide powder as claimed in claim 7, which is characterized in that in step 3,
The operating parameter of plasma are as follows: argon gas shield gas flow rate is 80slpm, and argon gas center gas flow is 30slpm, hydrogen stream
Amount is 17slpm.
9. the preparation method of cobalt-chromium-tungsten alloy cladding tantalum carbide powder as described in claim 1, which is characterized in that in step 4,
Argon carrier flow is 5slpm.
10. a kind of cobalt-chromium-tungsten alloy of the preparation of method described in any one of -9 according to claim 1 coats tantalum carbide powder,
It is characterized in that, the cobalt-chromium-tungsten alloy cladding tantalum carbide powder is spherical in shape, granularity is 45 μm -150 μm.
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