CN109182950B - Preparation method of TiC/Co-Ni alloy composite coating - Google Patents
Preparation method of TiC/Co-Ni alloy composite coating Download PDFInfo
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- 239000000956 alloy Substances 0.000 title claims abstract description 83
- 229910020630 Co Ni Inorganic materials 0.000 title claims abstract description 74
- 229910002440 Co–Ni Inorganic materials 0.000 title claims abstract description 74
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 108
- 238000000034 method Methods 0.000 claims abstract description 36
- 238000005507 spraying Methods 0.000 claims abstract description 34
- 238000007750 plasma spraying Methods 0.000 claims abstract description 22
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- 238000007788 roughening Methods 0.000 claims abstract description 7
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
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- 229910052786 argon Inorganic materials 0.000 claims description 6
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- 229910000990 Ni alloy Inorganic materials 0.000 description 2
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- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
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- 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
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- 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
- C23C4/06—Metallic material
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Abstract
The invention relates to a preparation method of a TiC/Co-Ni alloy composite coating. The method comprises the following steps: step 1, carrying out roughening treatment on the surface of a matrix sample; step 2, preparing Ti powder and C powder into Ti-C composite agglomerated powder by a spray granulation method; step 3, mechanically mixing the Ti-C agglomerated composite powder with Co-Ni alloy powder to obtain original feed spraying powder; step 4, spraying NiCrAlY self-fluxing alloy powder on the surface of the substrate sample to obtain a bonding bottom layer with the thickness of 90-120; and 5, adding the original feeding composite powder into plasma spraying equipment, and spraying the powder to the bottom surface by adopting a plasma spraying method to obtain the TiC/Co-Ni alloy composite coating. The invention generates TiC phase with high hardness, high melting point and abrasion resistance as the second reinforcing phase through reaction, and solves the problems of uneven TiC distribution, poor wettability, easy pollution of a bonding interface and the like.
Description
Technical Field
The invention relates to a preparation method of a plasma spraying coating, in particular to a plasma spraying coating with high hardness and high wear resistance and a preparation method thereof.
Background
TiC is a high hardness, high melting point, and wear resistant material, and also has a certain toughness, which makes it an excellent hard material. Compared with the traditional WC, the composite material has small specific gravity, higher high-temperature oxidation resistance and difficult decomposition at 1100 ℃, which can show that the composite material has excellent thermal stability. The cobalt-based self-fluxing alloy has excellent performances of wear resistance, corrosion resistance, high temperature resistance and the like, so that the cobalt-based self-fluxing alloy is paid attention by research workers and is widely applied to preparation of wear-resistant coatings. At present, research workers try to add a TiC hard phase into Co-Ni self-fluxing alloy to further improve the heat resistance and other properties of the material and obtain a composite coating with good performance.
At present, the TiC/Co-Ni alloy related material is prepared by a sintering method or a surface treatment method such as vapor deposition, laser cladding and the like. The sintering method is difficult to be applied to the preparation of complex structural parts, and ceramic TiC phase is added, so that the preparation process becomes complex, the preparation conditions also need strict requirements, the phase interface is easy to pollute, and the combination between the phases is not facilitated, so that the compactness of the material is reduced. The surface methods such as vapor deposition have the defects of low deposition efficiency, too thin thickness, poor combination with a matrix, inapplicability to the preparation of complex structural parts and the like, and are difficult to apply to service conditions of high load and high abrasion, thereby limiting the application of related materials.
The plasma spraying has the characteristics of simple process, flexibility, convenience, no need of redesign of workpieces and the like. The reactive plasma spraying is a novel thermal spraying technology integrating plasma spraying and self-propagating technology, has high deposition efficiency and lower production cost, and is suitable for parts of various sizes.
TiC ceramic particles and Co-based powder are prepared into composite powder suitable for spraying, and a Co-based TiC metal ceramic coating is prepared by adopting a plasma spraying technology (the microstructure and the high-temperature corrosion resistance [ J ] of the Co-based TiC metal ceramic coating prepared by plasma spraying are 2017,38(6): 416-419.). When the TiC content in the coating is high, the agglomeration phenomenon is easy to occur, and simultaneously, because the melting point of TiC ceramic particles is higher, the TiC ceramic particles stay in flame flow for a short time and cannot be completely dissolved, the performance of the coating cannot be fully exerted.
Disclosure of Invention
The invention aims to provide a preparation method of a TiC/Co-Ni alloy composite coating aiming at the defects of the plasma spraying coating. The method obtains Ti-C agglomerated composite powder by a spray granulation method, fully mixes the two kinds of powder by a mechanical mixing method with Co-Ni alloy powder, and sprays by using a plasma spraying technology. The invention utilizes the self-propagating reaction between micron-sized titanium powder and cheap graphite powder to generate a TiC phase with high hardness, high melting point and wear resistance as a second reinforcing phase, and solves the problems of uneven TiC distribution, poor wettability, easy pollution of a bonding interface and the like. The TiC/Co-Ni alloy composite coating prepared by reactive plasma spraying has higher hardness and wear resistance, so that the defect that the hardness and wear resistance of a single Co-Ni alloy coating are lower is overcome, and the composite coating can be applied to wear under the conditions of high speed and high load.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a preparation method of a TiC/Co-Ni alloy composite coating comprises the following steps:
step 3, mechanically mixing the Ti-C agglomerated composite powder with Co-Ni alloy powder to obtain original spraying feed powder; wherein the mass of the Ti-C agglomerated composite powder is 5 to 25 percent of that of the spraying feeding composite powder;
step 4, spraying NiCrAlY self-fluxing alloy powder on the surface of the substrate sample to obtain a bonding bottom layer with the thickness of 90-120;
wherein the spraying parameters are set as follows: working current is 450-500A; the arc voltage is 55-75V; argon flow is 20-40L/min, and pressure is 0.6-0.8 MPa; the hydrogen flow is 4-8L/min, and the pressure is 0.6-0.8 MPa; the powder feeding speed is 2-5L/min; the spraying distance is 80-120 mm; the spraying angle is 90 degrees; wherein, argon is used as protective gas and powder feeding gas, and hydrogen is used as side ion gas.
The roughening treatment method in the step 1 is sand blasting, sand paper grinding or mechanical processing roughening.
In the step 1, the substrate is carbon steel, stainless steel or heat-resistant steel.
In the step 3, the Co-Ni alloy powder is Ni-Cr-Co-Mo alloy powder, and the particle size of the powder is 150-350 meshes, namely the particle size of the powder is 38-74 mu m.
In the step 4, the particle size of the NiCrAlY self-fluxing alloy powder is 150 meshes-350 meshes, namely the particle size of the powder is 38 mu m-74 mu m.
The TiC/Co-Ni alloy composite coating prepared by the process utilizes the self-propagating reaction between Ti powder and graphite powder to generate a TiC phase with high hardness, high melting point and wear resistance, and is uniformly distributed in the composite coating to obtain the TiC/Co-Ni alloy composite coating with stable structure and performance.
The invention has the beneficial effects that:
(1) the method comprises the following steps of agglomerating cheap graphite powder and Ti powder into spherical Ti-C composite agglomerated powder with good fluidity by a spray granulation process, wherein the original particle size of the graphite powder is 10000 meshes, the original particle size of the Ti powder is 500 meshes, and the mass ratio of Ti to C in the Ti-C composite agglomerated powder is 4: 1.
(2) And fully mixing the spherical Ti-C composite agglomerated powder subjected to spray granulation with the Co-Ni alloy by mechanical mixing to obtain uniformly mixed spraying feeding composite powder, wherein the mass of the Ti-C composite agglomerated powder is 5-25% of that of the spraying feeding composite powder respectively.
(3) In the plasma spraying process, the powder feeder is used for feeding the uniformly mixed spraying feed composite powder into plasma flame flow, and when the powder is deposited on the bonding layer, the Ti powder and the graphite powder in the spraying feed composite powder undergo a self-propagating reaction to generate TiC, so that the TiC/Co-Ni alloy composite coating with a compact tissue structure is obtained.
(4) The main phases of the composite coating prepared by the process are Ni-Cr-Co-Mo and TiC, and the TiC is uniformly distributed in the composite coating, so that the hardness and the wear resistance of the composite coating are improved. Compared with a single Co-Ni alloy coating, the TiC/Co-Ni alloy composite coating prepared by the method has obviously improved microhardness, and the average microhardness of the surface of the single Co-Ni alloy coating is 667.03Hv0.2And the average microhardness of the composite coating is 855.8Hv0.2. The average wear of a single Co-Ni alloy coating after the same tribological experiment was 0.3694mm3And the average abrasion loss of the composite coating is reduced to 0.109mm3Namely, the abrasion loss is reduced by about 70 percent, and the abrasion resistance is obviously improved.
(5) Compared with a single Co-Ni alloy coating, the TiC/Co-Ni alloy composite coating prepared by reactive plasma spraying has the advantages that the hardness and the wear resistance are remarkably improved, the TiC/Co-Ni alloy composite coating is suitable for the fields of machinery such as drill bits, cutting tools, grinding tools and the like, automobile manufacturing, aerospace and the like under the conditions of abrasion and high temperature, and the application prospect is wide.
Drawings
FIG. 1 is an SEM image of a TiC/Co-Ni alloy composite coating on the surface of a 45# steel substrate in example 1 of the invention;
FIG. 2 is an XRD spectrum of a TiC/Co-Ni alloy composite coating on the surface of a 45# steel substrate in example 1 of the invention;
FIG. 3 is a graph of the average microhardness of a TiC/Co-Ni alloy composite coating on the surface of a 45# steel substrate in example 1 of the present invention;
FIG. 4 is a chart of the coefficient of friction of the TiC/Co-Ni alloy composite coating on the surface of the 45# steel substrate in example 1 of the present invention;
FIG. 5 is a graph of the average wear volume of the TiC/Co-Ni alloy composite coating on the surface of the 45# steel substrate in example 1 of the invention.
Detailed Description
The invention will be described in further detail below with reference to the embodiments of the drawing, which are intended to facilitate the understanding of the invention and are not intended to limit the invention in any way.
The Co-Ni alloy powder is Ni-Cr-Co-Mo alloy powder, and the particle size of the powder is 150-350 meshes, namely the particle size of the powder is 38-74 mu m. The Ni-Cr-Co-Mo alloy powder comprises the following chemical components in percentage by mass: 25% of Ni, 30% of Cr, 35% of Co and the balance of Mo.
The particle size of the NiCrAlY self-fluxing alloy powder related by the invention is 150 meshes-350 meshes, namely the particle size of the powder is 38 mu m-74 mu m. The NiCrAlY self-fluxing alloy powder comprises the following chemical components in percentage by mass: 72% of Ni, 17.7% of Cr, 10% of Al and the balance of Y.
The granularity of original Ti powder related by the invention is 500 meshes, the granularity of graphite powder is 10000 meshes, the granularity of Co-Ni alloy powder is 150-350 meshes, and the mass ratio of Ti to C in the Ti-C composite agglomerated powder is 4: 1.
Example 1:
in the embodiment, the TiC/Co-Ni alloy composite coating is prepared on the surface of a 45# steel substrate sample by adopting a reactive plasma spraying process, the main phases of the coating are Ni-Cr-Co-Mo and TiC, and TiC is distributed in the composite coating in a strip form to obtain a compact composite coating.
The preparation method of the composite coating comprises the following steps:
(1) and putting the 45# steel substrate sample into a TPS-1 type pneumatic sand blasting machine, and performing surface sand blasting roughening treatment to obtain the surface roughness of 2.5-13.0/micrometer. In the sand blasting process, abrasive particles are sucked into the nozzle, accelerated in high-pressure airflow and sprayed to the surface of the substrate to obtain a clean and rough surface, so that the binding force between the substrate and the coating is increased;
(2) the method comprises the steps of carrying out spray granulation by using a QFNL-300 type high-speed centrifugal spray dryer consisting of a peristaltic pump, an air heater, a spray head, a drying tower, a draught fan and the like, and agglomerating original Ti powder and graphite powder with fine granularity and poor fluidity into spherical Ti-C composite agglomerated powder with good fluidity, wherein the particle size of the spherical Ti-C composite agglomerated powder is about 50-80 mu m, the particle size of the original Ti powder is 500 meshes, the particle size of the graphite powder is 10000 meshes, and the mass ratio of the Ti powder to the C powder is 4: 1. And the Ti-C composite agglomerated powder and Co-Ni alloy powder are mechanically mixed to obtain the spraying and feeding composite powder, wherein the mass fraction of the Ti-C composite agglomerated powder is 15 percent of that of the spraying and feeding composite powder.
(3) And before spraying the composite coating, spraying a NiCrAlY bonding bottom layer with the thickness of 90-120 mu m on the surface of the steel matrix, wherein the particle size of NiCrAlY powder is 150-350 meshes. The nickel-chromium-aluminum-iridium bonding layer can improve the mechanical occlusion of the coating and the substrate, coordinate the thermal stress caused by the difference of expansion coefficients between the coating and the substrate, and improve the bonding strength between the TiC/Co-Ni alloy composite coating and the substrate;
(4) the method comprises the following steps of (1) feeding spraying feed powder obtained by mechanical mixing into high-temperature and high-speed plasma flame flow by using a powder feeder, wherein the spraying feed powder comprises the following specific steps: fixing the substrate on a spraying workbench, and adjusting the working current to 500A; arc voltage 70V; the powder feeding rate is 4L/min; the scanning speed of the spray gun is 0.0064 m/s; adjusting the spraying distance to be 100 mm; the spraying angle is 90 degrees; the argon flow is 40L/min, and the argon pressure is 0.7 MPa; the hydrogen flow is 7L/min, and the hydrogen pressure is 0.7 MPa. And spraying the TiC/Co-Ni alloy composite coating on the surface of the bonding layer, wherein the thickness of the coating is 260-350 mu m.
FIG. 1 is an SEM image of the TiC/Co-Ni alloy composite coating prepared as described above. It can be seen that the coating texture is denser, the bonding is good, and no unmelted regions appear. The TiC phase and the Co-Ni alloy are tightly combined to obtain a composite coating with a relatively compact structure
FIG. 2 is the XRD pattern of the TiC/Co-Ni alloy composite coating prepared above. As can be seen from the figure, the coating prepared by the method has main phases of Ni-Cr-Co-Mo and TiC, and simultaneously has the appearance of Ti oxides. Indicating that TiC can be generated by reactive plasma spraying, thereby effectively improving the hardness and the wear resistance of the composite coating.
And (3) carrying out hardness test on the prepared TiC/Co-Ni alloy composite coating by using a microhardness tester, wherein the applied load time of the test is 15s, and the load is 200 g. For comparison, the exact same hardness test was performed on the Co-Ni alloy coating. The measured microhardness of the coating is shown in fig. 3, and compared with the Co-Ni alloy coating, the TiC/Co-Ni alloy composite coating prepared in the example has significantly increased microhardness.
And performing a friction experiment on the prepared TiC/Co-Ni alloy composite coating. The friction and wear performance of the composite coating is tested by adopting an SFT-2M cutting disc type friction and wear testing machine in the experiment, and a friction pair is Si with the diameter of 4mm3N4The ceramic ball was rotated at 400r/min for 30min, and the friction coefficient and wear loss of the composite coating under a load of 30N were measured, and for comparison, the same friction test was performed for the Co-Ni alloy coating. The coating friction coefficient and the average wear amount were measured after passing the friction test, as shown in fig. 4 and 5. As can be seen from FIG. 4, compared with the Co-Ni alloy coating, the friction coefficient of the TiC/Co-Ni alloy composite coating in the present embodiment is lower than that of the Co-Ni alloy coating in the first 15min, and then slightly higher than that of the Co-Ni alloy coating, but the difference is not great. As can be seen from FIG. 5, the TiC/Co-Ni alloy composite coating is compared with the Co-Ni alloy coatingThe wear rate is far lower than that of a Co-Ni alloy coating, and the wear resistance is more excellent.
Example 2:
in the embodiment, the TiC/Co-Ni alloy composite coating is prepared on the surface of a 45# steel substrate sample by adopting a reactive plasma spraying process, the main phases of the coating are Ni-Cr-Co-Mo and TiC, and a small amount of TiC is distributed in the composite coating.
The preparation method of the composite coating comprises the following steps:
and feeding the mechanically-mixed uniformly-sprayed feeding composite powder into a plasma flame flow by using a powder feeder, and spraying the powder onto the surface of the bonding layer to obtain the TiC/Co-Ni alloy composite coating, wherein the mass of Ti-C composite agglomerated powder in the sprayed feeding composite powder is 5%, and the other steps are the same as those in example 1.
The SEM image of the TiC/Co-Ni alloy composite coating prepared by the method is similar to that shown in figure 1, the structure of the coating is relatively compact, and the TiC distribution is less.
The XRD pattern of the TiC/Co-Ni alloy composite coating prepared by the method is similar to that shown in figure 2, the main phases of the composite coating prepared by the method are Ni-Cr-Co-Mo and TiC, and TiC is uniformly distributed in the composite coating, so that the hardness and the wear resistance of the composite coating are relatively improved.
The TiC/Co-Ni alloy composite coating prepared in the way is subjected to hardness test in example 1, the microhardness of the test is similar to that of figure 3, and it can be seen that the relative hardness of the coating is high, and the microhardness of the composite coating is remarkably improved due to the generation of TiC phases. But lower than the composite coating made in example 1.
The TiC/Co-Ni alloy composite coating prepared above was subjected to a rubbing test as in example 1. For comparison, the exact same rubbing experiment was performed on the Co — Ni alloy coating. The coefficient of friction and the amount of wear of the coating measured by friction were similar to those shown in fig. 4 and 5, from which it can be seen that the coefficient of friction was substantially equal to that of the Co-Ni alloy coating, while the average amount of wear was lower than that of the Co-Ni alloy coating alone, and the wear resistance was improved. But the wear resistance was reduced compared to the composite coating of example 1.
Example 3:
in this embodiment, a reactive plasma spraying process is used to prepare a TiC/Co-Ni alloy composite coating on the surface of a 45# steel substrate sample, the main phases of the coating are Ni-Cr-Co-Mo and TiC, and a large amount of TiC is aggregated in the composite coating.
The preparation method of the composite coating comprises the following steps:
and feeding the mechanically-mixed uniformly-sprayed feeding composite powder into a plasma flame flow by using a powder feeder, and spraying the powder onto the surface of the bonding layer to obtain the TiC/Co-Ni alloy composite coating, wherein the mass of Ti-C composite agglomerated powder in the sprayed feeding composite powder is 25%, and the other steps are the same as those in example 1.
The SEM image of the TiC/Co-Ni alloy composite coating prepared by the method is similar to that shown in figure 1, the structure of the coating is relatively compact, a large amount of TiC is distributed in the composite coating, and the quantity of holes in the coating is increased.
The XRD pattern of the TiC/Co-Ni alloy composite coating prepared by the method is similar to that shown in figure 2, the main phases of the composite coating prepared by the method are Ni-Cr-Co-Mo and TiC, and TiC is uniformly distributed in the composite coating, so that the hardness and the wear resistance of the composite coating are relatively improved.
The TiC/Co-Ni alloy composite coating prepared in the way is subjected to hardness test in example 1, the microhardness of the test is similar to that of figure 3, and it can be seen that the relative hardness of the coating is high, and the microhardness of the composite coating is remarkably improved due to the generation of TiC phases. But lower than the composite coating made in example 1.
The TiC/Co-Ni alloy composite coating prepared above was subjected to a rubbing test as in example 1. For comparison, the exact same rubbing experiment was performed on the Co — Ni alloy coating. The coefficient of friction and the amount of wear of the coating measured by friction were similar to those shown in fig. 4 and 5, from which it can be seen that the coefficient of friction was substantially equal to that of the Co-Ni alloy coating, while the average amount of wear was lower than that of the Co-Ni alloy coating alone, and the wear resistance was improved. But the wear resistance was reduced compared to the composite coating of example 1.
The embodiments described above are intended to illustrate the technical solutions of the present invention in detail, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modification, supplement or similar substitution made within the scope of the principles of the present invention should be included in the protection scope of the present invention.
The invention is not the best known technology.
Claims (3)
1. A preparation method of a TiC/Co-Ni alloy composite coating is characterized by comprising the following steps:
step 1, carrying out roughening treatment on the surface of a matrix sample;
step 2, preparing Ti powder and C powder into Ti-C composite agglomerated powder with the particle size of 50-80 microns by a spray granulation method; wherein the particle size of Ti powder is 20-60 μm, the particle size of C powder is 1-5 μm, the mass ratio of Ti to C in the Ti-C composite agglomerated powder is 6-4: 1, and C is graphite;
step 3, mechanically mixing the Ti-C agglomerated composite powder with Co-Ni alloy powder to obtain spraying feed composite powder; wherein the mass of the Ti-C agglomerated composite powder is 5-25% of that of the spraying feeding composite powder;
step 4, spraying NiCrAlY self-fluxing alloy powder on the surface of the substrate sample to obtain a bonding bottom layer with the thickness of 90-120 mu m;
step 5, adding the original feeding composite powder into plasma spraying equipment, and then spraying the powder to the bottom surface by adopting a plasma spraying method to obtain a TiC/Co-Ni alloy composite coating, wherein the thickness of the coating is 260-350 mu m;
wherein the spraying parameters are set as follows: working current is 450-500A; the arc voltage is 55-75V; argon flow is 20-40L/min, and pressure is 0.6-0.8 MPa; the hydrogen flow is 4-8L/min, and the pressure is 0.6-0.8 MPa; the powder feeding speed is 2-5L/min; the spraying distance is 80-120 mm; the spraying angle is 90 degrees; wherein, argon is used as protective gas and powder feeding gas, and hydrogen is used as auxiliary ion gas;
in the step 3, the Co-Ni alloy powder is Ni-Cr-Co-Mo alloy powder, and the particle size of the powder is 150-350 meshes; the mass fraction of the Ni-Cr-Co-Mo alloy powder is as follows: 25% of Ni, 30% of Cr, 35% of Co and the balance of Mo;
and in the step 4, the particle size of the NiCrAlY self-fluxing alloy powder is 150-350 meshes.
2. A TiC/Co-Ni alloy composite coating preparation method as claimed in claim 1, wherein the roughening treatment in step 1 is sand blasting or sand paper grinding.
3. The method of claim 1, wherein the substrate in step 1 is carbon steel.
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| CN104233167A (en) * | 2013-06-21 | 2014-12-24 | 上海宝钢工业技术服务有限公司 | Modification treatment method for surface of automobile die through thermal spraying |
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| CN104233167A (en) * | 2013-06-21 | 2014-12-24 | 上海宝钢工业技术服务有限公司 | Modification treatment method for surface of automobile die through thermal spraying |
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