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A kind of hard alloy surface carburizing method

A cemented carbide and surface carburizing technology, which is applied in the field of surface treatment and cemented carbide surface carburizing, can solve the problems of long carburizing time, grain growth, and low efficiency, so as to improve carburizing efficiency and small particle size , The effect of simple process

Active Publication Date: 2019-05-07
SICHUAN UNIV
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Problems solved by technology

[0005] The present invention aims at the problems of severe grain growth, long carburizing time and low efficiency in the "sintering + carburizing" process existing in the current cemented carbide surface carburizing treatment. Alloy body, and then Al 2 o 3 coated TiH 2 The core / shell structure powder and graphene mixed planetary ball mill are uniformly mixed to form a hydrogen-containing carburizing medium, and then the porous green body is placed in the carburizing medium and compacted, and finally the cemented carbide surface is infiltrated during liquid phase sintering carbon

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  • A kind of hard alloy surface carburizing method

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example 1

[0019] Example 1: Carburize the surface of cemented carbide according to the following steps:

[0020] (1) Preparation of cemented carbide blanks containing carbide-forming elements: Weigh various raw material powder ingredients, Co accounts for 3wt%, W accounts for 1wt%, and WC is the balance; the weighed powders are mixed and passed through 40h ball milling, 400-mesh sieve filtration, drying at 85°C, mixing 60% of the weight of cemented carbide powder with butadiene rubber molding agent, pressing and molding under 320MPa pressure to obtain cemented carbide green body; cemented carbide green body in vacuum In the sintering furnace, the temperature is raised to 580°C, the temperature rise rate is 2°C / min, the vacuum degree is 8Pa, and the temperature is kept for 1h to form a cemented carbide blank containing carbide-forming elements;

[0021] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size of 0.6 μm 2 The powder is added to abso...

example 2

[0024] Example 2: Carburize the surface of cemented carbide according to the following steps:

[0025] (1) Preparation of cemented carbide blanks containing carbide-forming elements: Weigh various raw material powder ingredients, by weight percentage Co accounts for 20wt%, Mo accounts for 2wt%, W accounts for 2wt%, and WC is the balance; The powder is mixed and ball milled for 62 hours, filtered with a 400-mesh screen, dried at 90°C, mixed with a butadiene rubber molding agent according to 110% of the weight of the cemented carbide powder, and pressed under a pressure of 370MPa to obtain a cemented carbide green body; The alloy green body is heated to 670°C in a vacuum sintering furnace, the heating rate is 4°C / min, the vacuum degree is 10Pa, and it is kept for 2 hours to form a cemented carbide body containing carbide forming elements;

[0026] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size of 1.2 μm 2 The powder is added to a...

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Abstract

The invention discloses a method for carburizing the surface of cemented carbide, which is characterized in that it first heats the temperature at 550-700°C for 1-2 hours to form a cemented carbide blank containing carbide-forming elements; 2 o 3 coated TiH 2 Core / shell structure powder with thickness less than 3nm, number of layers less than 3 and specific surface area greater than 250m 2 / g of graphene and two substances are mixed according to the weight percentage of 2:3 to prepare a hydrogen-containing carburizing medium; then the green body is embedded in the hydrogen-containing carburizing medium and compacted under a pressure of 5~15MPa; finally, the liquid phase Sintering to realize carburizing of cemented carbide surface. The invention overcomes the problems of severe crystal grain growth, long carburizing time and low efficiency in the prior art, and realizes carburizing of the hard alloy surface in the sintering process.

Description

technical field [0001] The invention relates to a surface treatment method, in particular to a cemented carbide surface carburizing method, which belongs to the field of surface engineering. Background technique [0002] Cemented carbide has high hardness, high wear resistance, high temperature resistance, high strength, high elastic modulus and excellent chemical stability, and occupies an extremely important position in the modern material industry. In order to further improve its friction and wear performance, carburizing treatment is usually carried out on its surface. [0003] CN104493161A discloses a method for carburizing cemented carbide in a vacuum sintering furnace, comprising the following steps: a. putting each cemented carbide decarburized product into a bag containing a carburizing mixture, hard The alloy decarburized product is covered by carburizing mixture, and after the bag mouth is fastened, it is placed in a cold isostatic press and pressed through a pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/64C22C29/08C22C1/05B22F3/10
CPCC22C1/051C22C29/067C22C29/08C23C8/64B22F3/1007B22F3/1035B22F2998/10B22F2999/00B22F2201/30B22F3/1021B22F2201/20B22F1/10B22F3/02
Inventor 郭智兴熊计叶俊镠
Owner SICHUAN UNIV
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