CN108441804B - High-performance metal ceramic composite coating for lithium electric compression roller and preparation method thereof - Google Patents

High-performance metal ceramic composite coating for lithium electric compression roller and preparation method thereof Download PDF

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CN108441804B
CN108441804B CN201810115216.0A CN201810115216A CN108441804B CN 108441804 B CN108441804 B CN 108441804B CN 201810115216 A CN201810115216 A CN 201810115216A CN 108441804 B CN108441804 B CN 108441804B
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compression roller
composite powder
nicr
lithium
spraying
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CN108441804A (en
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曾德长
罗政
邱兆国
张友生
廖红星
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Gent Materials Surface Technology Guangdong Co ltd
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Gent Materials Surface Technology Guangdong Co ltd
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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
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/027—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal matrix material comprising a mixture of at least two metals or metal phases or metal matrix composites, e.g. metal matrix with embedded inorganic hard particles, CERMET, MMC.
    • 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
    • C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • 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

Abstract

The invention discloses a high-performance metal ceramic composite coating for a lithium electric compression roller, which is characterized by comprising a priming coat sprayed on the surface of a lithium electric compression roller substrate and a working coat sprayed on the surface of the priming coat, wherein the priming coat is WC-Cr3C2-NiCr composite powder, wherein the working layer is WC-CoCr composite powder. The preparation method adopts an active combustion high-speed gas spraying technology to spray powder on the surface of a pretreated die to prepare the metal ceramic coating. The method can prepare the metal ceramic coating which is well combined with the matrix and has high wear resistance and corrosion resistance, and prolongs the service life of the lithium electric compression roller.

Description

High-performance metal ceramic composite coating for lithium electric compression roller and preparation method thereof
Technical Field
The invention relates to the field of metal ceramic composite coatings, in particular to a high-performance metal ceramic composite coating for a lithium electric compression roller and a preparation method thereof.
Background
Electroplating of chromium has been widely used as a technique for the long-standing application of chromium on the surfaces of mechanical parts which are easily abraded and corroded due to its excellent properties. The main material of the electroplating hard chromium technology is chromium, and in the application process, a chromic acid solution can react with most elements to generate a large amount of hydrogen, so that the electroplating hard chromium technology is not advocated for comprehensive use; the electroplating hard chromium technology has the problem of environmental pollution inevitably caused by the neutralization of chromium. The problems that arise from the continued use of this technology are exacerbated today when society is rapidly developing, and the task of seeking an alternative to the electroplating of hard chrome is of particular importance.
According to the research of related scholars, the novel process for replacing electroplating hard chromium is already popular in many developed countries, the thermal spraying process instrument has zero pollution, the raw materials are easy to obtain, and the operation is convenient to be praised as the best process for replacing electroplating hard chromium. In combination with the development history of thermal spraying technology, the technology has achieved a lot of remarkable results in many application industries, and is also gradually paid attention and accepted.
The thermal spraying technique is a process of feeding a coating material into a certain heat source (arc, combustion flame, plasma, etc.) to be melted and spraying it onto the surface of a base material using a high-speed gas flow to form a coating layer. The process is simple, convenient, flexible and efficient to operate, the defects of more pores and low bonding strength of the thermal spraying coating are overcome due to various coating materials, the quality of the coating is greatly leap, and the thermal spraying coating has a solid technical foundation for replacing electroplated hard chromium. Among them, the three-cathode plasma spraying equipment adopts axial powder feeding, the working state of the equipment is stable, the deposition efficiency is high, and the characteristics make AC-HVAF (active combustion high-speed gas spraying technology) become the most attractive method for replacing hard chromium electroplating. Furthermore, by appropriate cooling methods and careful control of the movement of the spray gun, the temperature of the workpiece surface can be controlled below 93 ℃, so that many temperature sensitive materials can also be spray treated by HVOF (high velocity gas spray) techniques.
In the lithium battery compression roller industry, the traditional hard chromium plating process is generally adopted in the market at present, the compression roller in the lithium battery industry is expensive in manufacturing cost, and in an actual working condition, because the plating stripping and the plating re-plating are carried out once every several months, the production is seriously influenced, and the repair cost is very high. From the perspective of materials, hard chromium plating works under actual working conditions, if slurry has hard particles, the phenomena of surface depression, scratching and the like can occur, the slurry is usually in an alkaline environment, and the hard chromium plating has the problems of low hardness, poor wear resistance or poor alkaline corrosion resistance, and along with the increasing development of the lithium battery industry, the traditional hard chromium plating process cannot meet the production requirements. Therefore, the preparation of the protective coating on the surface of the lithium electric compression roller, which has the properties of high hardness, good wear resistance, high bonding strength and good corrosion resistance, is a problem to be solved urgently at present.
The invention content is as follows:
the invention aims to overcome the defects of the prior art and provides a high-performance metal ceramic composite coating for a lithium electric compression roller and a preparation method thereof. The metal ceramic composite coating which is well combined with the matrix and the priming coat, has high hardness, wear resistance, corrosion resistance and high bonding strength can be prepared by the method, so that the service life of the lithium electric compression roller is obviously prolonged, and the use cost is reduced.
The invention adopts the following technical scheme:
the high-performance metal ceramic composite coating for the lithium electric compression roller is characterized by comprising a priming layer and a working layer, wherein the priming layer is sprayed on the surface of a lithium electric compression roller substrate, the working layer is sprayed on the surface of the priming layer, and the priming layer is WC-Cr3C2-NiCr composite powder, wherein the working layer is WC-CoCr composite powder.
Preferably, the WC-Cr3C2the-NiCr composite powder comprises 70-80 wt% of WC and 12-25 wt% of Cr in percentage by mass3C2And 4-15 wt% of NiCr.
Further preferably, the WC-Cr3C2-NiCr composite powder comprising, in mass%, 73 wt% WC, 20 wt% Cr3C2And 7 wt% NiCr.
Preferably, the WC-CoCr composite powder comprises, by mass, 80-90 wt% of WC, 5-15 wt% of Co and 2-6 wt% of Cr.
Further preferably, the WC-CoCr composite powder comprises 86 wt% of WC, 10 wt% of Co and 4 wt% of Cr in percentage by mass.
Preferably, the thickness of the base layer is 80-120 μm, and the thickness of the working layer is 120-150 μm.
A preparation method of a high-performance metal ceramic composite coating for a lithium electricity compression roller is characterized by comprising the following steps:
(1) cleaning and roughening the base material of the lithium electric compression roller;
(2) for WC-Cr3C2Preheating the-NiCr composite powder, the WC-CoCr composite powder and the lithium electric compression roller base material;
(3) adopts the active combustion high-speed gas spraying technology to spray WC-Cr3C2-NiCr composite powder sprayCoating the surface of a lithium electric compression roller substrate to obtain a priming layer;
(4) and spraying WC-CoCr composite powder on the surface of the priming layer by adopting an active combustion high-speed gas spraying technology, and polishing to obtain the working layer.
Preferably, the step (1) of degreasing and roughening the surface of the lithium electric compression roller substrate comprises the following specific steps: the surface of the lithium electric compression roller base material is ultrasonically cleaned by acetone, and then sandblasted and coarsened by 24-80# white corundum until the surface roughness is Ra 2-5 mu m.
Preferably, in the step (2), WC-Cr3C2The specific steps of carrying out preheating treatment on the-NiCr composite powder and the WC-CoCr composite powder are as follows: drying the composite powder at 60-120 ℃ for 2 h; the specific steps of carrying out preheating treatment on the lithium electric compression roller substrate are as follows: preheating the lithium electric compression roller base material to 100-150 ℃.
Preferably, the process parameters of the active combustion high-speed gas spraying in the step (3) and the step (4) are as follows: the fuel type is propane, the pressure of the fuel I is 97-103 Psi, the pressure of the fuel II is 102-105 Psi, the air pressure is 105-108 Psi, the powder feeding flow of nitrogen is 70-80L/min, the powder feeding rate is 50-70 g/min, the spraying distance is 280-360 mm, and the spraying angle is 80-90 degrees.
The invention adopts WC-Cr3C2-NiCr metal composite ceramic powder is used as a priming layer, and the components of the-NiCr metal composite ceramic powder are high in WC hardness, good in wear resistance and Cr3C2Has Cr element, and plays a role in corrosion resistance in the coating; the NiCr alloy on the one hand acts as a binder phase in the coating, which improves the bond strength and toughness of the coating, and on the other hand, it has excellent corrosion resistance. In addition, since Cr is contained in3C2The hardness of the coating is much lower than that of WC, and the coating can be used as a priming coat to reduce the internal stress generated in the spraying process, thereby being more beneficial to improving the bonding strength of a working surface coating and a compression roller matrix. The WC-CoCr composite ceramic powder is used as a working layer, the WC component content is high, the wear resistance is good, the hard CoCr bonding phase has good coating capacity, the decarburization of WC in the spraying process can be reduced, and the corrosion resistance is good. WC-Cr3C2-NiCr compositeThe powder and the WC-CoCr composite powder are prepared by high-energy ball milling and then spray granulation.
The invention has the beneficial effects that:
(1) the coating prepared by the invention has excellent performances of high hardness, wear resistance, corrosion resistance and high bonding strength, and can be used as a coating material of a lithium electric compression roller.
(2) Compared with the traditional supersonic flame and plasma spraying, the metal ceramic composite coating prepared by adopting the active combustion high-speed gas spraying technology can effectively prevent WC and Cr due to the lower flame temperature and higher flame flow velocity3C2Oxidizing and decarbonizing to prepare the coating with high wear resistance, high bonding strength and low porosity.
(3) The invention adopts the coating structure to replace the traditional single coating, which is not only beneficial to reducing the cost, but also more beneficial to improving the bonding strength of the coating and the substrate.
Drawings
FIG. 1 is a cross-sectional profile of a cermet composite coating prepared in example 1 of the present invention.
FIG. 2 is a graph of friction factors over time for a cermet composite coating and a 9Cr2Mo lithium electrofusion roll substrate prepared in example 1 of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1:
the embodiment provides a high-performance metal ceramic composite coating for strengthening the surface of a hot-working die. The bottom layer is made of WC-Cr3C2-NiCr composite powder prepared from 73 wt% WC and 20 wt% Cr3C2And 7 wt% of NiCr is prepared by high-energy ball milling and then spray granulation, the working layer is prepared by WC-CoCr composite powder, and the composite powder is prepared by 86 wt% of WC, 10 wt% of Co and 4 wt% of Cr through high-energy ball milling and then spray granulation.
The preparation method of the high-performance metal ceramic composite coating for the lithium electric compression roller comprises the following steps:
firstly, acetone ultrasonic cleaning is carried out on the surface of a 9Cr2Mo lithium electricity compression roller base material, then 24# white corundum is used for carrying out sand blasting coarsening, and the surface roughness after sand blasting is Ra3.9 mu m.
Step two, before spraying, WC-Cr3C2the-NiCr composite powder and the WC-CoCr composite powder are dried at 120 ℃ for 2 hours, and the 9Cr2Mo lithium electrocompaction roller substrate is preheated to 150 ℃.
Step three, adopting an active combustion high-speed gas spraying technology to spray WC-Cr3C2-NiCr spray powder is sprayed on the surface of the base material as a base coat layer with a thickness of 100 μm.
And step four, spraying WC-CoCr spraying powder on the surface of the priming layer to be used as a working layer, wherein the thickness is 150 mu m.
The spraying process parameters are as follows: the fuel type is propane, the pressure of the fuel I is 103Psi, the pressure of the fuel II is 105Psi, the air pressure is 108Psi, the powder feeding flow of nitrogen is 75L/min, the powder feeding rate is 60g/min, the spraying distance is 280mm, and the spraying angle is 90 degrees.
Example 2
The embodiment provides a high-performance metal ceramic composite coating for strengthening the surface of a hot-working die. The bottom layer is made of WC-Cr3C2-NiCr composite powder prepared from 73 wt% WC, 16 wt% Cr3C2And 11 wt% of NiCr is prepared by high-energy ball milling and then spray granulation, the working layer is prepared by WC-CoCr composite powder, and the composite powder is prepared by 86 wt% of WC, 10 wt% of Co and 4 wt% of Cr through high-energy ball milling and then spray granulation.
The preparation method of the high-performance metal ceramic composite coating for the lithium electric compression roller comprises the following steps:
firstly, acetone ultrasonic cleaning is carried out on the surface of a 9Cr2Mo lithium electricity compression roller base material, then 24# white corundum is used for carrying out sand blasting coarsening, and the surface roughness after sand blasting is Ra3.6 mu m.
Step two, before spraying, WC-Cr3C2Drying the-NiCr composite powder and the WC-CoCr composite powder at 120 ℃ for 2 hours, and pressing a 9Cr2Mo lithium electric roller baseThe material was preheated to 130 ℃.
Step three, adopting an active combustion high-speed gas spraying technology to spray WC-Cr3C2-spraying NiCr spraying powder on the surface of the base material to be used as a priming layer, wherein the thickness is 100 mu m;
and step four, spraying WC-CoCr spraying powder on the surface of the priming layer to be used as a working layer, wherein the thickness is 150 mu m.
The spraying process parameters are as follows: the fuel type is propane, the pressure of the fuel I is 97Psi, the pressure of the fuel II is 102Psi, the air pressure is 105Psi, the powder feeding flow of nitrogen is 70L/min, the powder feeding rate is 50g/min, the spraying distance is 280mm, and the spraying angle is 80 degrees.
Example 3
The embodiment provides a high-performance metal ceramic composite coating for strengthening the surface of a hot-working die. The bottom layer is made of WC-Cr3C2-NiCr composite powder prepared from 73 wt% WC, 14 wt% Cr3C2And 13 wt% of NiCr is prepared by high-energy ball milling and then spray granulation, the working layer is prepared by WC-CoCr composite powder, and the composite powder is prepared by 86 wt% of WC, 10 wt% of Co and 4 wt% of Cr through high-energy ball milling and then spray granulation.
The preparation method of the high-performance metal ceramic composite coating for the lithium electric compression roller comprises the following steps:
firstly, acetone ultrasonic cleaning is carried out on the surface of a 9Cr2Mo lithium electricity compression roller base material, then 24# white corundum is used for carrying out sand blasting coarsening, and the surface roughness after sand blasting is Ra3.3 mu m.
Step two, before spraying, WC-Cr3C2the-NiCr composite powder and the WC-CoCr composite powder are dried at 120 ℃ for 2 hours, and the 9Cr2Mo lithium electrocompaction roller substrate is preheated to 110 ℃.
Step three, adopting an active combustion high-speed gas spraying technology to spray WC-Cr3C2-spraying NiCr spraying powder on the surface of the base material to be used as a priming layer, wherein the thickness is 100 mu m;
and step four, spraying WC-CoCr spraying powder on the surface of the priming layer to be used as a working layer, wherein the thickness is 150 mu m.
The spraying process parameters are as follows: the fuel type is propane, the pressure of the fuel I is 100Psi, the pressure of the fuel II is 103Psi, the air pressure is 107Psi, the powder feeding flow of nitrogen is 80L/min, the powder feeding rate is 60g/min, the spraying distance is 360mm, and the spraying angle is 85 degrees.
Example 4
The embodiment provides a high-performance metal ceramic composite coating for strengthening the surface of a hot-working die. The bottom layer is made of WC-Cr3C2-NiCr composite powder prepared from 73 wt% WC and 12 wt% Cr3C2And 15 wt% of NiCr is prepared by high-energy ball milling and then spray granulation, the working layer is prepared by WC-CoCr composite powder, and the composite powder is prepared by 86 wt% of WC, 10 wt% of Co and 4 wt% of Cr through high-energy ball milling and then spray granulation.
The preparation method of the high-performance metal ceramic composite coating for the lithium electric compression roller comprises the following steps:
firstly, acetone ultrasonic cleaning is carried out on the surface of a 9Cr2Mo lithium electric compression roller base material, then 24# white corundum is used for carrying out sand blasting coarsening, and the surface roughness after sand blasting is Ra3 mu m.
Step two, before spraying, WC-Cr3C2the-NiCr composite powder and the WC-CoCr composite powder are dried at 120 ℃ for 2 hours, and the 9Cr2Mo lithium electrocompaction roller substrate is preheated to 110 ℃.
Step three, adopting an active combustion high-speed gas spraying technology to spray WC-Cr3C2-NiCr spray powder is sprayed on the surface of the base material as a base coat layer with a thickness of 100 μm.
And step four, spraying WC-CoCr spraying powder on the surface of the priming layer to be used as a working layer, wherein the thickness is 150 mu m. The spraying process parameters are as follows: the fuel type is propane, the pressure of the fuel I is 103Psi, the pressure of the fuel II is 105Psi, the air pressure is 108Psi, the powder feeding flow of nitrogen is 75L/min, the powder feeding rate is 70g/min, the spraying distance is 320mm, and the spraying angle is 90 degrees.
Example 5
The embodiment provides a high-performance metal ceramic for surface strengthening of a hot-working dieAnd (4) a ceramic composite coating. The bottom layer is made of WC-Cr3C2-NiCr composite powder, the composite powder is prepared from 70 wt% of WC and 15 wt% of Cr3C2And 15 wt% of NiCr is prepared by high-energy ball milling and then spray granulation, the working layer is prepared by WC-CoCr composite powder, and the composite powder is prepared by 89 wt% of WC, 5 wt% of Co and 6 wt% of Cr through high-energy ball milling and then spray granulation.
The preparation method of the high-performance metal ceramic composite coating for the lithium electric compression roller comprises the following steps:
firstly, acetone ultrasonic cleaning is carried out on the surface of a 9Cr2Mo lithium electric compression roller base material, then 50# white corundum is used for carrying out sand blasting coarsening, and the surface roughness after sand blasting is Ra5 mu m.
Step two, before spraying, WC-Cr3C2the-NiCr composite powder and the WC-CoCr composite powder are dried at 60 ℃ for 2 hours, and the 9Cr2Mo lithium electricity compression roller substrate is preheated to 100 ℃.
Step three, adopting an active combustion high-speed gas spraying technology to spray WC-Cr3C2-NiCr spray powder is sprayed on the surface of the base material as a base coat layer, and the thickness is 120 μm.
And step four, spraying WC-CoCr spraying powder on the surface of the priming layer to be used as a working layer, wherein the thickness is 130 mu m. The spraying process parameters are as follows: the fuel type is propane, the pressure of the fuel I is 103Psi, the pressure of the fuel II is 105Psi, the air pressure is 108Psi, the powder feeding flow of nitrogen is 75L/min, the powder feeding rate is 70g/min, the spraying distance is 320mm, and the spraying angle is 90 degrees.
Example 6
The embodiment provides a high-performance metal ceramic composite coating for strengthening the surface of a hot-working die. The bottom layer is made of WC-Cr3C2-NiCr composite powder, which is prepared from 80 wt% of WC and 12 wt% of Cr3C2And 8 wt% of NiCr is prepared by high-energy ball milling and then spray granulation, the working layer is prepared by WC-CoCr composite powder, and the composite powder is prepared by high-energy ball milling and then spray granulation of 90 wt% of WC, 8 wt% of Co and 2 wt% of Cr.
The preparation method of the high-performance metal ceramic composite coating for the lithium electric compression roller comprises the following steps:
firstly, acetone ultrasonic cleaning is carried out on the surface of a 9Cr2Mo lithium electric compression roller base material, then 80# white corundum is used for carrying out sand blasting coarsening, and the surface roughness after sand blasting is Ra2 mu m.
Step two, before spraying, WC-Cr3C2the-NiCr composite powder and the WC-CoCr composite powder are dried at 90 ℃ for 2 hours, and the 9Cr2Mo lithium electrocompaction roller substrate is preheated to 130 ℃.
Step three, adopting an active combustion high-speed gas spraying technology to spray WC-Cr3C2-NiCr spray powder is sprayed on the surface of the base material as a priming layer, and the thickness is 80 μm.
And step four, spraying WC-CoCr spraying powder on the surface of the priming layer to be used as a working layer, wherein the thickness is 120 mu m. The spraying process parameters are as follows: the fuel type is propane, the pressure of the fuel I is 103Psi, the pressure of the fuel II is 105Psi, the air pressure is 108Psi, the powder feeding flow of nitrogen is 75L/min, the powder feeding rate is 70g/min, the spraying distance is 320mm, and the spraying angle is 90 degrees.
Example 7
The embodiment provides a high-performance metal ceramic composite coating for strengthening the surface of a hot-working die. The bottom layer is made of WC-Cr3C2-NiCr composite powder prepared from 71 wt% WC and 25 wt% Cr3C2And 4 wt% of NiCr is prepared by high-energy ball milling and then spray granulation, the working layer is prepared by WC-CoCr composite powder, and the composite powder is prepared by high-energy ball milling and then spray granulation of 80 wt% of WC, 15 wt% of Co and 5 wt% of Cr.
The preparation method of the high-performance metal ceramic composite coating for the lithium electric compression roller comprises the following steps:
firstly, acetone ultrasonic cleaning is carried out on the surface of a 9Cr2Mo lithium electric compression roller base material, then 80# white corundum is used for carrying out sand blasting coarsening, and the surface roughness after sand blasting is Ra2 mu m.
Step two, before spraying, WC-Cr3C2-NiCr composite powder and WC-CoCr compositeThe powder was dried at 90 ℃ for 2 hours and the 9Cr2Mo lithium electrocompaction roll substrate was preheated to 130 ℃.
Step three, adopting an active combustion high-speed gas spraying technology to spray WC-Cr3C2-NiCr spray powder is sprayed on the surface of the base material as a priming layer, and the thickness is 80 μm.
And step four, spraying WC-CoCr spraying powder on the surface of the priming layer to be used as a working layer, wherein the thickness is 120 mu m. The spraying process parameters are as follows: the fuel type is propane, the pressure of the fuel I is 103Psi, the pressure of the fuel II is 105Psi, the air pressure is 108Psi, the powder feeding flow of nitrogen is 75L/min, the powder feeding rate is 70g/min, the spraying distance is 320mm, and the spraying angle is 90 degrees.
The performance test method of the metal ceramic composite coating comprises the following steps:
and (3) testing the micro Vickers hardness property: the test is carried out by referring to national standard GB/T9790-1998, a coating section sample is firstly inlaid, ground and polished, and hardness test is carried out by using an HVS-1000 type digital display micro Vickers hardness tester. The load applied during the test was 0.3Kg and the test was held for 15 seconds. In order to ensure the accuracy of the data, 12 points were measured at random for each coating, and then two values of the highest and lowest hardness were removed, and 10 valid data were retained for each coating and the average and standard deviation were calculated.
And (3) testing the frictional wear performance: the friction and wear test is carried out on a HT-1000 friction and wear testing machine, and the used friction pair is Si with the diameter of 6mm3N4The ceramic ball has the test load of 10N, the rotating speed of 400rpm, the temperature of room temperature and the abrasion time of 30 min.
And (3) testing a potentiodynamic polarization curve: a sample is cut into a circle with the diameter of 2cm and the thickness of 3mm, the circle is polished to 900 meshes, and the zeta potential polarization curve of the sample in a 1mol/L NaOH solution is measured, wherein the parameters of the zeta potential polarization curve are that the sample is scanned from-1.0 v (vs. OCP) to 1.0v (vs. OCP), and the scanning speed is 10 mV/s.
And (3) testing the bonding strength: according to GB/T8642-2002, the bonding strength of the coating is measured by a dual-drawing method, a coating with the thickness of about 250 μm is sprayed on one end of a sample, the other end is subjected to sand blasting roughening treatment, and then E is used for rougheningThe 7 glue (purchased from Shanghai Huayi resin Co., Ltd.) was bonded together, and the bonded materials were put into a resistance furnace at 100 ℃ for 3 hours to cure, and after cooling, a tensile test was carried out on a UTM5105 electronic universal tester at a set load rate of 150N/s. The maximum load force at which the coating was snapped was recorded and then calculated as: calculating the bonding strength of the coating, wherein P is the bonding strength (MPa) of the coating, F is the loading force (N) when the coating is pulled apart, and S is the bonding area (mm) of the coating and the substrate2). Each coating was subjected to 3 tensile tests, and the average of the 3 measurements was taken as the bond strength of the coating.
The following table shows the results of performance testing of the coatings of each example and the test sample of the comparative example (9Cr2Mo lithium cell press roll substrate).
Figure GDA0002220084840000081
As can be seen from the data in the table above, the sprayed WC-Cr3C2After the NiCr metal ceramic composite coating is used as a working layer, the performances of the lithium electric compression roller in all aspects are greatly improved, and the metal ceramic composite coating plays a good protection role in the lithium electric compression roller.
Further observing the section morphology (as shown in figure 1) of the metal ceramic composite coating, the metal ceramic composite coating prepared by the invention is well combined with the base coat and the base body, has no obvious boundary line, has uniform and compact structure and no obvious microcrack. In addition, in fig. 2-o ━ is the friction factor curve of 9Cr2Mo press roll base material, - ● is the friction factor curve of cermet composite coating, as can be seen: the friction factor of the metal ceramic composite coating is obviously smaller than that of the 9Cr2Mo press roll base material, and the friction factor curve is more stable, which shows that the friction performance of the metal ceramic composite coating is better than that of the 9Cr2Mo press roll base material.
The above embodiments are only for illustrating the technical solutions of the present invention and are not limited thereto, and any modification or equivalent replacement without departing from the spirit and scope of the present invention should be covered by the technical solutions of the present invention.

Claims (7)

1. The high-performance metal ceramic composite coating for the lithium electric compression roller is characterized by comprising a priming layer and a working layer, wherein the priming layer is sprayed on the surface of a lithium electric compression roller substrate, the working layer is sprayed on the surface of the priming layer, and the priming layer is WC-Cr3C2-NiCr composite powder, wherein the working layer is WC-CoCr composite powder; the WC-Cr3C2the-NiCr composite powder comprises 70-80 wt% of WC and 12-25 wt% of Cr in percentage by mass3C2And 4-15 wt% of NiCr, wherein the WC-CoCr composite powder comprises 80-90 wt% of WC, 5-15 wt% of Co and 2-6 wt% of Cr in percentage by mass; the thickness of the bottom layer is 100-120 mu m, and the thickness of the working layer is 120-150 mu m.
2. The high performance cermet composite coating for lithium pinch rollers of claim 1 wherein the WC-Cr is selected from the group consisting of3C2-NiCr composite powder comprising, in mass%, 73 wt% WC, 20 wt% Cr3C2And 7 wt% NiCr.
3. The high-performance cermet composite coating for lithium battery rolls according to claim 1, wherein the WC-CoCr composite powder comprises, in mass%, 86 wt% WC, 10 wt% Co, 4 wt% Cr.
4. A preparation method of a high-performance metal ceramic composite coating for a lithium electricity compression roller is characterized by comprising the following steps:
(1) cleaning and roughening the base material of the lithium electric compression roller;
(2) for WC-Cr3C2Preheating the-NiCr composite powder, the WC-CoCr composite powder and the lithium electric compression roller base material;
(3) adopts the active combustion high-speed gas spraying technology to spray WC-Cr3C2Spraying NiCr composite powder on the surface of the lithium electric compression roller base material to obtain a priming layer;
(4) spraying WC-CoCr composite powder on the surface of the priming layer by adopting an active combustion high-speed gas spraying technology, and polishing to obtain a working layer;
the WC-Cr3C2the-NiCr composite powder comprises 70-80 wt% of WC and 12-25 wt% of Cr in percentage by mass3C2And 4-15 wt% of NiCr, wherein the WC-CoCr composite powder comprises 80-90 wt% of WC, 5-15 wt% of Co and 2-6 wt% of Cr in percentage by mass;
the thickness of the bottom layer is 100-120 mu m, and the thickness of the working layer is 120-150 mu m.
5. The preparation method of the high-performance metal ceramic composite coating for the lithium compression roller according to claim 4, wherein the step (1) of degreasing and roughening the surface of the base material of the lithium compression roller comprises the following specific steps: the surface of the lithium electric compression roller base material is ultrasonically cleaned by acetone, and then sandblasted and coarsened by 24-80# white corundum until the surface roughness is Ra 2-5 mu m.
6. The method for preparing a high-performance metal ceramic composite coating for a lithium battery compression roller according to claim 4, wherein in the step (2), WC-Cr3C2The specific steps of carrying out preheating treatment on the-NiCr composite powder and the WC-CoCr composite powder are as follows: drying the composite powder at 60-120 ℃ for 2 h; the specific steps of carrying out preheating treatment on the lithium electric compression roller substrate are as follows: preheating the lithium electric compression roller base material to 100-150 ℃.
7. The preparation method of the high-performance metal ceramic composite coating for the lithium electricity compression roller according to claim 4, wherein the process parameters of the active combustion high-speed gas spraying in the step (3) and the step (4) are as follows: the fuel type is propane, the pressure of the fuel I is 97-103 Psi, the pressure of the fuel II is 102-105 Psi, the air pressure is 105-108 Psi, the powder feeding flow of nitrogen is 70-80L/min, the powder feeding rate is 50-70 g/min, the spraying distance is 280-360 mm, and the spraying angle is 80-90 degrees.
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