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Method of forming composite coating on surface of hard alloy

A cemented carbide and composite coating technology, applied in metal material coating process, coating and other directions, can solve the problems of complex method, high cost, low oxidation resistance, etc., to achieve simple process, controllable ratio of raw materials, high Effect of hardness and high temperature oxidation resistance

Active Publication Date: 2013-09-18
ZHUZHOU JINGGONG CEMENTED CARBIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention solves the technical problems in the prior art that the method for forming a coating on the surface of the cemented carbide is complicated, the cost is high, and the hardness and oxidation resistance of the coating are low

Method used

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  • Method of forming composite coating on surface of hard alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Take the raw cemented carbide and raise the temperature to 400-700°C in a vacuum furnace to remove the molding agent, and perform mirror polishing on the surface to obtain a cemented carbide billet.

[0043] (2) Weigh the raw materials according to the weight percentage of titanium oxide, boron nitride, and aluminum oxide at 35:20:45, and dissolve the raw materials in concentrated H with a volume ratio of 5:2. 2 SO 4 \HNO 3 In a solvent, stir in a constant temperature water bath at 80-100°C for 6-24 hours, vibrate in an ultrasonic wave for 1-3 hours, transfer to a centrifuge and centrifuge for 1-3 hours, filter the centrifuged solution, wash repeatedly with deionized water, and adjust the pH The value is 2-5, take the centrifuged solution and dry it at 80-150°C, then heat-treat it at 400-800°C for 10-50min, then dissolve it in ethanol and stir vigorously, and finally age it for 6-24h to obtain this example coating sol.

[0044] (3) Put the cemented carbide obtain...

Embodiment 2

[0048] (1) Take the raw cemented carbide and heat it up to 400-900°C in a vacuum furnace to remove the molding agent, and perform mirror polishing on the surface to obtain a cemented carbide billet.

[0049] (2) Weigh the raw materials according to the weight percentage of titanium oxide, boron nitride, and aluminum oxide at 40:15:45, and dissolve the raw materials in concentrated H with a volume ratio of 3:2. 2 SO 4 \HNO 3 In a solvent, stir in a constant temperature water bath at 80-100°C for 6-24 hours, vibrate in an ultrasonic wave for 1-3 hours, transfer to a centrifuge and centrifuge for 1-3 hours, filter the centrifuged solution, wash repeatedly with deionized water, and adjust the pH The value is 2-5, take the centrifuged solution and dry it at 80-150°C, then heat-treat it at 400-800°C for 10-50min, then dissolve it in ethanol and stir it, and finally age it for 6-24h to obtain this example coating sol.

[0050] (3) Put the cemented carbide obtained in step (1) into...

Embodiment 3

[0054] (1) Take the raw cemented carbide and heat it up to 400-900°C in a vacuum furnace to remove the molding agent, and perform mirror polishing on the surface to obtain a cemented carbide billet.

[0055] (2) Weigh the raw materials according to the weight percentage of titanium oxide, boron nitride and aluminum oxide at 45:25:30, and dissolve the raw materials in concentrated H with a volume ratio of 5:2. 2 SO 4 \HNO 3 In the solvent, dry in a constant temperature water bath at 80-100°C, after heat treatment, dissolve in ethanol, stir, then age the solution system for 6-24h, stir at ℃ for 6-24h, vibrate in ultrasonic for 1-3h, transfer to centrifuge Centrifuge in the machine for 1-3 hours, filter the centrifuged solution, wash it repeatedly with deionized water, and adjust the pH value to 2-5, take the centrifuged solution and dry it at 80-150°C, then heat-treat it at 400-800°C for 10 -50 min, then dissolved in ethanol and vigorously stirred, and finally aged for 6-24 h ...

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Abstract

The invention provides a method for forming a composite coating on a surface of a hard alloy. The method comprises the following stops: A, treating of green body treating: sintering a green compact of the hard alloy in a vacuum furnace to remove forming agent, and polishing the surface of the hard alloy; b, preparation of coating collosol: taking titanium oxide, boron nitride and aluminum oxide as raw materials, taking concentrated sulfuric acid and nitric acid as solvents, adding the raw materials into the solvents, centrifuging after ultrasonic dispersion, drying and conducting heat treatment on centrifugal solution, dissolving the solution in ethanol, and then aging; C, dip-coating: putting the green compact of the hard alloy in the coating collosol for dip-coating and drying; and D, coating sintering: transferring to the vacuum furnace for sintering at 1200-1400 DEG C to obtain the product. For the method provided by the invention, the process is simple, the implementation is easy, the raw material proportion is controllable, no special requirement is imposed on equipment and environment, and the cost is greatly reduced. In addition, in the method, with the appropriate selection of the raw materials, the coating formed on the surface of the hard alloy has higher hardness and high-temperature oxidation resistance.

Description

technical field [0001] The invention relates to the field of preparation of cermet surface coatings, in particular to a method for forming a composite coating on a hard alloy surface. Background technique [0002] Cemented carbide is currently the most important cutting tool material, and coated carbide is a milestone in the history of cutting tool development. Through various coating techniques, one or more layers of metal or non-metal compound films with high hardness and good wear resistance are coated on the cemented carbide substrate to form a coated tool, whose strength and toughness are guaranteed by the cemented carbide substrate. The high hardness and wear resistance are solved by the coating, so that the performance of the tool is greatly improved. At present, the main coating materials are Ti-Al-N type, Ti(C,N) type, TiC type, Ti-Si-N-C type and so on. [0003] The traditional methods of forming coatings on the surface of cemented carbide mainly include chemical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C26/00
Inventor 陈明伍小波
Owner ZHUZHOU JINGGONG CEMENTED CARBIDE