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Submicron crystalline ceramic coating for hard alloy and preparation method

A cemented carbide, sub-micron crystal technology, applied in the field of surface engineering, can solve the problems of residual stress of the substrate and coating, harsh working requirements, unsatisfactory coating, etc., to achieve easy control of film thickness, strong adaptability and low cost Effect

Inactive Publication Date: 2015-03-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal expansion matching between the coating and the substrate of this system is slightly insufficient, and because the hardness, elastic modulus, and thermal expansion coefficient of the substrate and the coating material do not match, and the lattice types are also different, resulting in a gap between the substrate and the coating. Residual stress, weak bonding force, long-term application at high temperature will easily cause problems such as coating peeling off
[0006] With the advancement of machining technology, the existing coatings can no longer meet the increasingly demanding work requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The ceramic composition is: 35wt% of alumina, 10wt% of zirconia, 3wt% of titania, the rest is silicon dioxide and the total amount is not more than 0.05% of unavoidable impurities.

[0041] The above-mentioned ceramic components were sequentially added into a mixing tank and mechanically mixed for 5 hours, then the uniformly mixed material was added into a corundum crucible, heated with a silicon-molybdenum rod electric furnace, and kept at 1650°C for 2 hours. Pour the prepared high-temperature molten liquid into cold water in a stainless steel container to obtain transparent amorphous, pulverize the amorphous and high-energy ball mill for 5 hours, and the average particle size of the obtained amorphous ceramic powder is 5.2 microns.

[0042] Take 20g of amorphous ceramic powder, add 1.5g of cobalt powder, and add it to 100ml of PVB solution with a mass percentage of 2wt%, prepare a coating slurry by mixing and high-energy ball milling for 5 hours, and use a spray gun to...

Embodiment 2

[0046] The ceramic composition is: 40wt% of alumina, 20wt% of zirconia, 8wt% of titania, the rest is silicon dioxide and the total amount is not more than 0.05% of unavoidable impurities.

[0047] The above-mentioned ceramic components were sequentially added into the mixing tank and mechanically mixed for 15 hours, and then the uniformly mixed material was added into a corundum crucible, heated with a silicon-molybdenum rod electric furnace, and kept at 1700°C for 4 hours. Pour the prepared high-temperature molten liquid into cold water in a stainless steel container to obtain transparent amorphous, pulverize the amorphous and high-energy ball mill for 10 hours, and the average particle size of the obtained amorphous ceramic powder is 2.4 microns.

[0048] Take 50g of amorphous ceramic powder, add 5g of cobalt powder, add it to 200ml of PVB solution with a mass percentage of 1wt%, and prepare a coating slurry by mixing and high-energy ball milling for 10 hours, and use a spray...

Embodiment 3

[0052] The ceramic composition is: 36wt% of alumina, 15wt% of zirconia, 4wt% of titania, the rest is silicon dioxide and the total amount is not more than 0.05% of unavoidable impurities.

[0053] The above-mentioned ceramic components were sequentially added into a mixing tank and mechanically mixed for 10 hours, then the uniformly mixed material was added into a corundum crucible, heated with a silicon-molybdenum rod electric furnace, and kept at 1700°C for 3 hours. Pour the prepared high-temperature molten liquid into cold water in a stainless steel container to obtain transparent amorphous, pulverize the amorphous and high-energy ball mill for 15 hours, and the average particle size of the obtained amorphous ceramic powder is 1.9 microns.

[0054] Take 25g of amorphous ceramic powder, add 2g of cobalt powder, add it to 130ml of PVB solution with a mass percentage of 4wt%, and prepare a coating slurry by mixing and high-energy ball milling for 15 hours, and use the dip-coati...

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Abstract

The invention provides a submicron crystalline ceramic coating for a hard alloy and a preparation method. The components of the submicron crystalline ceramic coating comprise Al2O3, ZrO2, TiO2, and SiO2. The preparation method comprises the following steps: respectively weighing powder materials, mixing the powder materials, heating to smelt the mixture, carrying out water quenching on the mixture to obtain non-crystalline ceramic, and ball-milling to obtain non-crystalline ceramic powder; adding Co powder into the non-crystalline ceramic powder, adding a solvent, and wet-milling to obtain coating slurry; coating the surface of the hard alloy with the coating slurry, drying the hard alloy, and sintering the hard alloy in a vacuum environment to obtain the submicron crystalline ceramic coating for the hard alloy. According to the invention, problems that the sintering temperature of SAZ ceramic coating is high, and the thermal expansion coefficient is not matched with the hard alloy are solved, the prepared coating has the advantages of high-temperature resistance and corrosion resistance, the preparation method is simple, the production cost of the hard alloy coating can be greatly reduced, such failure problems as oxidation, corrosion and attrition of hard alloy components under actual working conditions are solved to a certain extent, and the service lives of hard alloy materials and devices are prolonged.

Description

Technical field: [0001] The invention relates to a coating and a preparation method, in particular to a submicron crystal ceramic coating for hard alloy and a preparation method, and belongs to the technical field of surface engineering. Background technique: [0002] During the use of cemented carbide, high-temperature oxidation, wear, and corrosion problems often occur, which seriously affect the performance and service life of metal parts. Applying a protective coating on the surface of the alloy can not only improve the oxidation resistance and corrosion resistance of the alloy, but also basically maintain the alloy. Mechanical properties have been widely used in engineering. For example, coating one or more layers of metal or non-metal compound films with high hardness and good wear resistance (such as TiC, TiAlN, Al 2 o 3 etc.), the coating combines the advantages of high strength, high toughness of the substrate and high hardness and high wear resistance of the coat...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
Inventor 梁叔全刘赛男蔡圳阳康建安谭小平宋宇峰
Owner CENT SOUTH UNIV
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