CN106637044B - Method for preparing alloy ceramic composite coating by plasma spray welding and plasma spray welding gun - Google Patents
Method for preparing alloy ceramic composite coating by plasma spray welding and plasma spray welding gun Download PDFInfo
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- CN106637044B CN106637044B CN201611131740.4A CN201611131740A CN106637044B CN 106637044 B CN106637044 B CN 106637044B CN 201611131740 A CN201611131740 A CN 201611131740A CN 106637044 B CN106637044 B CN 106637044B
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- 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
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- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
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Abstract
The invention discloses a method for manufacturing a composite coating, in particular to a method for preparing an alloy ceramic composite coating by plasma spray welding, which comprises the following specific processes: firstly, preprocessing the surface of a matrix, alloy powder and ceramic particles; then, melting and covering alloy powder and ceramic particles on the surface of the matrix by using a designed plasma spraying welding gun, thus forming a metal-ceramic composite material reinforcing layer; when plasma spray welding is carried out, the alloy powder is directly conveyed into a plasma transferred arc, and the alloy powder is rapidly melted into a liquid state in the arc and falls onto the surface of a substrate to form a molten pool; the ceramic particles are transported to the outside of the plasma nozzle and fall into the molten pool outside the plasma transfer arc column. The invention makes the ceramic particles and the arc column fall into a molten pool formed by the melted alloy powder under the state of keeping a certain distance, and can effectively avoid the harmful effects of oxidation, decarburization and the like on the ceramic particles caused by the high temperature of the electric arc.
Description
Technical Field
The invention relates to a manufacturing method of a composite coating, in particular to a method for preparing an alloy ceramic composite coating by plasma spray welding. In addition, the invention also relates to a plasma spray welding gun.
Background
Compared with the conventional metal material, the metal-ceramic composite material reinforced by the ceramic particles has better hardness and wear resistance. Because of high hardness (HV1700), melting point (2870 ℃) and good wettability, tungsten carbide (WC) is often added into nickel-base, iron-base and cobalt-base alloy matrixes to prepare a metal-ceramic composite strengthening layer, and is widely applied to hydroelectric, thermal power, steel, mines, metallurgy and oil exploitation equipment to improve the capability of a working surface in resisting high-temperature impact and abrasive wear. Compared with sintering process, the overlaying process has less limitation on WC particle size and matrix size, is easy to operate and can be widely applied to wear-resistant occasions. Common surfacing technologies include manual argon arc surfacing, flame surfacing, submerged arc surfacing, plasma spray welding and the like, wherein the plasma spray welding technology is low in dilution rate due to the use of powdery filling materials, and is more suitable for preparing a metal-WC composite material reinforcing layer with high WC content.
The conventional plasma spray welding gun only has one powder feeding channel, and powder (which can be alloy powder, ceramic powder or a mixture of the alloy powder and the ceramic powder) conveyed from a powder feeder flows to a nozzle through the powder feeding channel in a gun body under the blowing of powder feeding air, directly enters an electric arc (called inner powder feeding) in a nozzle compression pore passage, or flows out of the nozzle and flies for a certain distance outside the nozzle and then enters an arc column (called outer powder feeding). When the traditional single-way powder feeding plasma spray welding gun is adopted to prepare the nickel-based alloy-tungsten carbide composite material wear-resistant strengthening layer, WC particles are firstly mixed with nickel-based alloy powder serving as a bonding phase according to a certain proportion and are simultaneously conveyed into a plasma arc column, because the temperature of the arc column is very high (up to 8000-. In order to control the temperature of the WC granules, a powder feeding mode of independently conveying the WC granules is necessary to eliminate the damage of the high temperature of the electric arc to the performance of the WC granules.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for preparing an alloy ceramic composite coating by plasma spray welding, which avoids burning loss of ceramic particles.
The invention solves the technical problem and adopts the method for preparing the alloy ceramic composite coating by plasma spray welding, firstly, the surface of a matrix, alloy powder and ceramic particles are pretreated; then cladding alloy powder and ceramic particles on the surface of the matrix by using a plasma spray welding gun, thus forming a metal-ceramic composite material reinforcing layer; when plasma spray welding is carried out, the alloy powder is directly conveyed into a plasma transfer arc column, and the alloy powder is rapidly melted into a liquid state in an electric arc and falls to the surface of a substrate to form a molten pool; the ceramic particles are transported to the outside of the plasma nozzle and fall into the molten pool outside the plasma transfer arc column.
Furthermore, when the surface of the substrate is pretreated, the oxide skin, the rust and the paint on the surface of the substrate are removed by adopting the modes of machining, sand blasting, shot blasting and polishing.
Further, when the alloy powder and the ceramic particles are pretreated, the alloy powder and the ceramic particles are dried, and after the alloy powder and the ceramic particles are cooled to room temperature, the alloy powder and the ceramic particles are loaded into an independent alloy powder feeder and an independent ceramic particle feeder.
Further, the alloy powder is nickel-based alloy powder, iron-based alloy powder or cobalt-based alloy powder.
Further, the ceramic particles are carbide ceramics, nitride ceramics, carbonitride ceramics, boride ceramics or oxide ceramics.
Further, the carbide ceramic is WC, SiC, TiC, ZrC and B4C. TaC or Cr3C2(ii) a The nitride ceramic is Si3N4TiN, BN, AlN or ZrN; the carbonitride ceramic is TiCN; the boride ceramic is TiB2、ZrB2WB or ZrB; the oxide ceramic is Al2O3、SiO2、Cr2O3、ZrO2Or TiO2。
Further, the alloy powder and the ceramic particles are respectively conveyed by independent conveyors, and the weight percentage of the ceramic particles in the prepared composite material reinforcing layer is adjusted by adjusting the conveying amount ratio between the conveyors.
The invention also aims to solve the technical problem of providing the plasma spray welding gun for avoiding burning loss of the ceramic particles.
According to the plasma spray welding gun provided by the invention, the nozzle and the cathode are matched with each other to form a plasma gas channel, a plasma jet orifice is formed at the tail end of the plasma gas channel, and the region opposite to the plasma jet orifice is a plasma transfer arc column region; the plasma transfer arc column area is communicated with the plasma transfer arc column area or the plasma jet orifice; and the ceramic particle nozzle of the ceramic particle powder feeding channel is positioned beside the plasma jet orifice, and the spraying direction of the ceramic particle nozzle is parallel to that of the plasma jet orifice.
Preferably, the nozzle is surrounded by the cathode, and the alloy powder feeding passage and the ceramic particle feeding passage are provided around the nozzle.
Preferably, the alloy powder feeding channels are provided with two ceramic particle nozzles of the ceramic particle powder feeding channel and two alloy powder nozzles of the alloy powder feeding channel which are distributed in a circular shape, the included angle between the positions of the ceramic particle nozzles and the nozzles of the two alloy powder feeding channels is 90 degrees, and the included angle between the positions of the nozzles of the two alloy powder feeding channels is 180 degrees.
The invention has the beneficial effects that: the invention adopts a multi-path powder feeding plasma spray welding gun which respectively conveys alloy powder used as a matrix and ceramic particles used as an external hard phase, simultaneously, the ceramic particles and an arc column fall into a molten pool formed by the melted alloy powder under the state of keeping a certain distance, the molten pool can form an alloy-ceramic composite material strengthening layer which takes the melted alloy powder as the matrix and is dispersedly distributed with the ceramic particles in the middle, and the harmful effects of oxidation, decarburization and the like on the ceramic particles caused by the high temperature of an electric arc can be effectively avoided. Compared with the traditional method of directly feeding the mixed alloy powder and ceramic powder into a transfer arc column, the multi-path independent powder feeding method provided by the invention can maintain the original performance of the ceramic particles to the maximum extent, greatly improves the overall performance of the surface layer composite material, can flexibly adjust the ceramic content in a molten pool in the spray welding process, and can uninterruptedly prepare a composite material strengthening layer with gradient change of the ceramic content.
Drawings
FIG. 1 is a top view of the present invention;
FIG. 2 is a sectional view taken along line A-B of FIG. 1;
FIG. 3 is a cross-sectional view taken along line A-C of FIG. 1;
parts, positions and numbers in the drawings: the device comprises a ceramic particle powder feeding channel 1, an ionic gas 2, a protective gas 3, ceramic particles 4, a molten pool 5, a metal-ceramic composite material strengthening layer 6, a substrate 7, a transfer arc 8, a protective gas curtain 9, a non-transfer arc 10, a nozzle 11, alloy powder 12, an alloy powder feeding channel 13, a main power supply 14, an arc striking power supply 15, an alloy powder nozzle 16 and a ceramic particle nozzle 17.
Detailed Description
The invention will be further explained with reference to the drawings. Fig. 1, 2 and 3 each show only the area at the nozzle of the plasma torch, since the main improvement of the invention lies in this area.
As shown in fig. 2, in the present invention, scales such as oxide scale, rust, paint, etc. on the surface of the substrate 7 are removed by machining, sand blasting, shot blasting, polishing, etc.; and drying the alloy powder 12 and the ceramic particles 4, cooling the alloy powder to room temperature, and then filling the cooled alloy powder and ceramic particles into an independent alloy powder feeder and an independent ceramic particle feeder. Then, cladding the alloy powder 12 and the ceramic particles 4 on the surface of the matrix 7 by using plasma spray welding, thus forming a metal-ceramic composite material reinforcing layer 6; when plasma spray welding is carried out, the alloy powder 12 is directly conveyed into a plasma transferred arc, and the alloy powder 12 is rapidly melted into a liquid state in the arc and falls to the surface of the substrate 7 to form a molten pool 5; the ceramic particles 4 are conveyed to the outside of the nozzle 11 through the ceramic particle powder feeding channel 1, do not enter the arc column of the plasma transfer arc 8, and fall into the molten pool 5 outside the arc column.
The alloy powder 12 is a nickel-based alloy powder, an iron-based alloy powder, a cobalt-based alloy powder, or the like. Which is typical of nickel-based alloy powders. The ceramic particles 4 are carbide ceramics such as WC, SiC, TiC, ZrC, B4C、TaC、Cr3C2Etc., nitride ceramics such as Si3N4TiN, BN, AlN, ZrN, etc., carbonitride ceramics such as TiCN, etc., boride ceramics such as TiB2、ZrB2WB, ZrB, etc. or other oxide ceramics such as Al2O3、SiO2、Cr2O3、ZrO2、TiO2And the like. Since tungsten carbide WC is representative, the following description will be mainly given by taking a nickel-based alloy and tungsten carbide as examples.
The working process of the invention is as follows:
performing spray welding by using a powder plasma spray welding gun with a plurality of independent powder feeding channels, wherein the spray welding gun body is internally provided with 3 powder feeding channels comprising 2 alloy powder feeding channels 13 and 1 ceramic particlePowder passageway 1 is sent to grain, encircle simultaneously around spouting welder nozzle 11 and set up 2 alloy powder spouts 16 and 1 ceramic granule spout 17, 2 alloy powder spouts 16 position contained angle each other is 180, the contained angle between alloy powder hole 16 and the ceramic granule spout 17 is 90, 2 alloy send powder passageway 13 and ceramic granule to send powder passageway 1 to keep apart each other, inside and nozzle 11 department of spouting welder, alloy powder 12 and ceramic granule 4 do not mix each other. When the plasma spraying welding machine works, the substrate 7 is firstly fixed, the plasma spraying welding gun is moved to the position above the substrate 7, and the ion gas 2 (N) is started2Or Ar gas), an arc ignition power supply 15 and a main power supply 14, a non-transferred arc 10 is ignited by means of high-frequency sparks, a transferred arc 8 is ignited by means of a conductive channel formed by arc flame of the non-transferred arc 10 between a tungsten electrode and a workpiece, a molten pool 5 with the diameter size similar to that of a beam is rapidly formed on the surface of a substrate 7 under the high-temperature action (8000-10000 degrees) of an arc column of the transferred arc 8, simultaneously, prepared alloy powder 12 and ceramic particles 4 are respectively and independently conveyed into 2 alloy powder feeding channels 13 and a ceramic particle feeding channel 1, and after the alloy powder 12 is sprayed out from 2 alloy powder nozzles 16, protective gas 3 (N) is sprayed out2Or Ar gas) is formed into a protective gas curtain 9, the protective gas curtain is converged in an arc column of a plasma transfer arc 8 after flying for a certain distance, the protective gas curtain is rapidly melted under the action of the high temperature of the arc column and then becomes fine liquid drops to fall into a molten pool 5, ceramic particles 4 are sprayed out from a ceramic particle nozzle 17 and then are positioned outside the arc column of the plasma transfer arc 8, the ceramic particles vertically fall in the protective gas curtain 9 and then enter the tail part of an alloy molten pool 5, and the ceramic particles sink in the molten pool 5 and are distributed in the molten pool 5 in a dispersed manner due to the fact that the specific gravity of the ceramic particles 4 is greater than that of alloy powder 12, and an alloy-ceramic composite material strengthening layer. The metal-ceramic composite material strengthening layer with the width, the thickness and the weight percentage of the ceramic particles meeting the requirements can be obtained by controlling the plasma transferred arc current, the swinging width of the welding gun, the moving speed of the welding gun, the powder feeding amount of the alloy powder and the ceramic particles.
As shown in fig. 1, 2 and 3, the plasma spray welding gun of the present invention includes a cathode and a nozzle 11, wherein the nozzle 11 and the cathode are matched with each other to form a plasma gas channel, the plasma gas channel forms a plasma spray opening at the end, the region directly opposite to the plasma spray opening is a plasma transfer arc column region, a shielding gas curtain 9 wraps the plasma transfer arc column region, and the shielding gas curtain 9 is formed by conveying shielding gas through the shielding gas channel; the powder feeding device also comprises an alloy powder feeding channel 13 and a ceramic particle feeding channel 1, wherein an alloy powder nozzle 16 of the alloy powder feeding channel 13 is communicated with a plasma transfer arc column area or a plasma nozzle, and the communication indicates that the alloy powder is conveyed to a corresponding position, for example, the alloy powder is sprayed to the plasma transfer arc column area and is also communicated; the ceramic particle nozzle 17 of the ceramic particle powder feeding channel 1 is positioned beside the plasma jet orifice, the spraying direction of the ceramic particle nozzle 17 is parallel to the spraying direction of the plasma jet orifice, and the ceramic particle nozzle 17 is positioned behind the plasma jet orifice during operation. The distance between the ceramic particle nozzle 17 and the plasma jet orifice can be adjusted to meet different process requirements, particularly by replacing nozzles 11 of different specifications.
Specifically, as shown in fig. 1, the nozzle 11 surrounds the cathode, two alloy powder feeding channels 13 are arranged, the ceramic particle nozzles 17 of the ceramic particle feeding channel 1 and the alloy powder nozzles 16 of the two alloy powder feeding channels are distributed in a circular manner, the included angle between the positions of the ceramic particle nozzles 17 and the positions of the nozzles of the two alloy powder feeding channels is 90 degrees, and the direction shown by the arrow in fig. 2 is the working direction of the plasma torch; the included angle of the positions of the nozzles of the two alloy powder feeding channels is 180 degrees. In actual work, after the alloy powder is sprayed out from the nozzles of the two alloy powder feeding channels 13, the alloy powder flies for a distance in the protective gas curtain and then is converged in the plasma transfer arc column, the nozzles of the two alloy powder feeding channels 13 are opposite sprayed, so that the speeds of the alloy powder in two directions can be offset, and the alloy powder leakage is avoided. The content of the ceramic particles 3 in the metal-ceramic composite material strengthening layer 5 can be adjusted through the conveying proportion of the alloy powder feeding channel 13 and the ceramic particle powder feeding channel 1, so that the hard phase content gradient change coating is obtained.
Example 1:
for the plasma spray welding of the nickel-based alloy-WC composite material wear-resistant layer of the finished blower blade, the steps are as follows:
1) the nickel-based alloy comprises the following components: 0.4-0.5% of C, 0.8-1.4% of B, 0.17-0.37% of Si, 5.0-6.0% of Cr5, 10.0-15.0% of Fe0 and the balance of Ni; WC component C4-6%, the rest is W;
2) putting the nickel-based alloy powder and WC into a drying oven, drying at 120 ℃ for 30min, taking out, cooling in air to room temperature, and adding the powder into a corresponding powder feeder and a corresponding WC powder feeder;
3) sand blasting is carried out on the surface of the fan blade, and an oxide layer on the surface is removed;
4) and preparing a nickel-based alloy-WC composite material wear-resistant spray welding layer on the surface of the blade by adopting automatic fan blade plasma spray welding equipment. The plasma spray welding process parameters are as follows: the welding method comprises the following steps of 100-120A of working current, 18-20V of working voltage, 200l/min of ion gas flow, 150l/min of nickel-based alloy powder feeding gas, 150l/min of WC powder feeding gas, 200l/min of protective gas flow, 25g/min of nickel-based alloy powder feeding amount, 10g/min of WC powder feeding amount, 100mm/min of walking speed, 20mm of swing width and 3-5 mm of thickness of a surfacing layer. The ion gas, the powder feeding gas and the protective gas are all 99.99 percent of industrial argon;
5) measuring the hardness of the nickel-based alloy matrix of the welding layer: HV350-400, WC grain hardness: HV1800-2200, the atomic fraction content of tungsten inside the matrix of the nickel-base alloy is measured to be 15-20 at% by energy dispersive analysis (EDS).
Example 2:
for the plasma spray welding of the wear-resistant lining plate for the finished product mine with the nickel-based alloy-WC composite material wear-resistant layer, the steps are as follows:
1) the nickel-based alloy used comprises the following components: cr 10-12%, B1.5-2%, Si 3-3.5%, Fe2.5-3%, and the balance of Ni; WC component C4-6%, the rest is W;
2) putting the nickel-based alloy powder and WC into a drying oven, drying at 120 ℃ for 30min, taking out, cooling in air to room temperature, and adding the powder into a corresponding powder feeder and a corresponding WC powder feeder;
3) polishing the surface of the lining plate until the metallic luster is exposed;
4) and preparing the nickel-based alloy-WC composite material wear-resistant spray welding layer on the surface of the lining plate by adopting automatic flat plate plasma spray welding equipment. The plasma spray welding process parameters are as follows: the welding method comprises the following steps of working current 180-185A, working voltage 28-30V, ion gas flow 300l/min, nickel-based alloy powder feeding gas 200l/min, protective gas flow 300l/min, WC powder feeding gas 200l/min, nickel-based alloy powder feeding amount 30g/min, WC powder feeding amount 40g/min, welding gun moving linear speed 60mm/min, and overlaying layer thickness 3.5-4 mm. The ion gas, the powder feeding gas and the protective gas are all 99.99 percent of industrial argon;
5) measuring the hardness of the nickel-based alloy matrix of the welding layer: HV400-450, WC particle hardness: HV1800-2200, the atomic fraction content of tungsten inside the matrix of the nickel-base alloy is measured to be 17-20 at% by energy dispersive analysis (EDS).
Example 3:
for the plasma spray welding of the nickel-based alloy-WC composite material wear-resistant layer of the finished subway shield cutting tool, the steps are as follows:
1) the nickel-based alloy comprises the following components: 0.8-1% of C, 78-20% of Cr18, 32-4% of B3, 4-5% of Si, 5-8% of Fe and the balance of Ni; WC component C4-6%, the rest is W;
putting nickel-based alloy powder and WC into an oven, drying at 120 ℃ for 30min, taking out, cooling in air to room temperature, and adding a corresponding metal powder feeder and a corresponding WC powder feeder;
3) sand blasting is carried out on the surface of the cutter, and rust on the surface is removed;
4) and preparing the nickel-based alloy-WC composite material wear-resistant spray welding layer on the surface of the cutter by adopting automatic cutter plasma spray welding equipment. The plasma spray welding process parameters are as follows: 110-115A of working current, 24-26V of working voltage, 200l/min of ion gas flow, 200l/min of protective gas flow, 150l/min of nickel-based alloy powder feeding gas, 120l/min of WC powder feeding gas, 20g/min of nickel-based alloy powder feeding amount, 20g/min of WC powder feeding amount, 80mm/min of workpiece rotation linear speed and 1.5-2 mm of thickness of a surfacing layer. The ion gas, the powder feeding gas and the protective gas are all 99.99 percent of industrial argon;
5) measuring the hardness of the nickel-based alloy matrix of the welding layer: HV520-600, WC grain hardness: HV 1800-2200.
Claims (9)
1. The multi-path powder feeding plasma spray welding gun comprises a cathode and a nozzle (11), wherein the nozzle (11) and the cathode are matched with each other to form a plasma gas channel, a plasma jet orifice is formed at the tail end of the plasma gas channel, and a region opposite to the plasma jet orifice is a plasma transfer arc column region; the method is characterized in that: the plasma spray welding gun further comprises an alloy powder feeding channel (13) and a ceramic particle powder feeding channel (1), wherein an alloy powder nozzle (16) of the alloy powder feeding channel (13) is communicated with a plasma transfer arc column region; the ceramic particle nozzle (17) of the ceramic particle powder feeding channel (1) is positioned beside the plasma nozzle, the spraying direction of the ceramic particle nozzle (17) is parallel to that of the plasma nozzle, and the ceramic particles (4) are conveyed to the outside of the plasma nozzle (11) and vertically fall into the molten pool (5) outside the arc column of the plasma transfer arc (8) and in the protective gas curtain (9); the powder feeding device is characterized in that two alloy powder feeding channels (13) are arranged, ceramic particle nozzles (17) of the ceramic particle powder feeding channels (1) and alloy powder nozzles (16) of the two alloy powder feeding channels are distributed in a circular mode, the included angles of the positions of the ceramic particle nozzles (17) and the nozzles of the two alloy powder feeding channels are 90 degrees, and the included angles of the positions of the nozzles of the two alloy powder feeding channels are 180 degrees.
2. The multi-feed plasma torch of claim 1 wherein: the nozzle (11) surrounds the cathode, and the alloy powder feeding channel (13) and the ceramic particle powder feeding channel (1) are arranged around the nozzle (11).
3. The method for preparing the alloy ceramic composite coating by plasma spray welding is characterized by comprising the following steps: firstly, pretreating the surface of a substrate (7), alloy powder (12) and ceramic particles (4); then cladding the alloy powder (12) and the ceramic particles (4) on the surface of the substrate (7) by using a multi-path powder feeding plasma spray welding gun for respectively conveying the alloy powder as the substrate and the ceramic particles as the external hard phase, thus forming the metal-ceramic composite material reinforcing layer (6), wherein the multi-path powder feeding plasma spray welding gun adopts the multi-path powder feeding plasma spray welding gun as claimed in claim 1 or 2; when plasma spray welding is carried out, the alloy powder (12) is directly conveyed into an arc column of a plasma transfer arc (8), and the alloy powder (12) is rapidly melted into a liquid state in the arc and falls to the surface of a substrate (7) to form a molten pool (5); the ceramic particles (4) are conveyed to the outside of the plasma nozzle (11) and vertically fall into the molten pool (5) outside the arc column of the plasma transfer arc (8) and in the protective gas curtain (9).
4. The method for preparing an alloy ceramic composite coating by plasma spray welding according to claim 3, wherein: when the surface of the substrate (7) is pretreated, the oxide skin, the rust and the paint on the surface of the substrate (7) are removed by adopting the modes of machining, sand blasting, shot blasting and polishing.
5. The method for preparing an alloy ceramic composite coating by plasma spray welding according to claim 3, wherein: when the alloy powder (12) and the ceramic particles (4) are pretreated, the alloy powder (12) and the ceramic particles (4) are dried, and after the alloy powder and the ceramic particles are cooled to room temperature, the alloy powder and the ceramic particles are loaded into an independent alloy powder feeder and an independent ceramic particle feeder.
6. The method for preparing an alloy ceramic composite coating by plasma spray welding according to claim 3, wherein: the alloy powder (12) is nickel-based alloy powder, iron-based alloy powder or cobalt-based alloy powder.
7. The method for preparing an alloy ceramic composite coating by plasma spray welding according to claim 3, wherein: the ceramic particles (4) are carbide ceramics, nitride ceramics, carbonitride ceramics, boride ceramics or oxide ceramics.
8. The method for preparing an alloy ceramic composite coating according to claim 7, wherein: the carbide ceramic is WC, SiC, TiC, ZrC and B4C. TaC or Cr3C2(ii) a What is needed isThe nitride ceramic is Si3N4TiN, BN, AlN or ZrN; the carbonitride ceramic is TiCN; the boride ceramic is TiB2、ZrB2WB or ZrB; the oxide ceramic is Al2O3、SiO2、Cr2O3、ZrO2Or TiO2。
9. The method for preparing an alloy ceramic composite coating by plasma spray welding according to claim 3, wherein: the alloy powder (12) and the ceramic particles (4) are respectively conveyed by independent conveyors, and the weight percentage of the ceramic particles (4) in the prepared composite material strengthening layer is adjusted by adjusting the conveying amount ratio between the conveyors.
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