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A kind of self-lubricating cemented carbide preparation method

A cemented carbide and self-lubricating technology, applied in metal material coating process, solid diffusion coating, coating, etc., can solve the problems of low efficiency, long carburizing time, grain growth, etc., and achieve simple process, Improvement of carburizing efficiency and effect of small particle size

Active Publication Date: 2019-01-18
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 in the preparation of self-lubricating hard alloys at present, and proposes to firstly remove the forming agent from the hard alloy compact It forms a porous green body, and then Al 2 o 3 coated TiH 2 core / shell structure powder, graphene, NaHCO 3 The mixed planetary ball mill is uniformly mixed to form a hydrogen-containing carburizing medium, then the porous green body is placed in the carburizing medium and compacted, and finally the self-lubricating cemented carbide is formed in situ during liquid phase sintering

Method used

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  • A kind of self-lubricating cemented carbide preparation method

Examples

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example 1

[0019] Example 1: Prepare self-lubricating carbide according to the following steps:

[0020] (1) Preparation of the release agent cemented carbide green body: Weigh various raw material powder ingredients according to weight percentage, among which Co accounts for 6wt%, TaC accounts for 2wt%, and WC is the balance; the weighed powders are mixed and ball milled for 32 hours , filtered through a 400-mesh screen, dried at 89°C, mixed with butadiene rubber molding agent according to 62% of the weight of the cemented carbide powder, and pressed and formed under a pressure of 340MPa to obtain a cemented carbide green body; the cemented carbide green body is vacuum sintered Insulate at 650°C for 2 hours, the heating rate is 2°C / min, and the vacuum degree is 14Pa to form a cemented carbide green body with a porosity of 27% and the removal of forming agents;

[0021] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size of 0.5 μm 2 The powder...

example 2

[0024] Example 2: Prepare self-lubricating carbide according to the following steps:

[0025] (1) Forming agent cemented carbide green body preparation: Weigh various raw material powder ingredients according to weight percentage, among which Co accounts for 15wt%, TiC accounts for 15wt%, and WC is the balance; the weighed powders are mixed and ball milled for 42 hours , filtered through a 400-mesh screen, dried at 97°C, mixed with butadiene rubber molding agent according to 70% of the weight of the cemented carbide powder, and pressed under a pressure of 360MPa to obtain a cemented carbide green body; the cemented carbide green body is vacuum sintered Insulate at 580°C for 2 hours, the heating rate is 3°C / min, and the vacuum degree is 17Pa to form a cemented carbide green body with a porosity of 32% and the removal of the forming agent;

[0026] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size of 0.9 μm 2 The powder is added to ...

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Abstract

The invention discloses a preparation method of a self-lubricating hard alloy. The preparation method of the self-lubricating hard alloy is characterized in that the temperature is kept at 550-750 DEG C for 2-4 hours, so that a forming-agent-free hard alloy green body with the porosity being 25%-40% is formed; core / shell structure powder with Al2O3 covering TiH2, graphene and NaHCO3 are mixed at the weight percentage ratio of 1:2:1 to be prepared into a hydrogenous carburizing medium, wherein the thickness of the graphene is smaller than 3 nm, the number of layers of the graphene is smaller than 3, and the specific surface area of the graphene is larger than 250 m<2> / g; the green body is embedded into the hydrogenous carburizing medium and is compacted at the pressure of 5-15 MPa; and finally, liquid-phase sintering is conducted, and preparation of the self-lubricating hard alloy is achieved in the sintering process. The preparation method of the self-lubricating hard alloy solves the problems that in the prior art, grains grow severely, the carburizing time is long, and efficiency is low, and the self-lubricating hard alloy is prepared in the sintering process.

Description

technical field [0001] The invention relates to a preparation method of hard alloy, in particular to a preparation method of self-lubricating hard alloy, which belongs to the field of hard materials. Background technique [0002] Known for its high hardness, high wear resistance and high strength, cemented carbide has a long history as a tool material. With the advancement of science and technology, the improvement of processing efficiency and the development of CAD / CAM, the application field of cemented carbide is also expanding day by day, and the requirements for its comprehensive performance are also getting higher and higher. The solid lubricating phase is introduced to form a self-lubricating effect, which can reduce the wear when it is used as a cutting tool and wear-resistant parts. [0003] CN105252239A discloses a method for preparing a gradient cemented carbide cutting tool, wherein the method comprises the following steps: (a) preparing a carbon-poor cemented ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C29/06C22C1/05C22C1/10C23C8/64
CPCC22C1/051C22C29/005C22C29/067C22C29/08C23C8/64
Inventor 郭智兴熊计叶俊镠
Owner SICHUAN UNIV
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