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A kind of preparation method of cemented carbide with graphite-rich phase on the surface

A technology of cemented carbide and graphite phase, applied in metal processing equipment, metal material coating process, solid-state diffusion coating, etc., can solve the problems of grain growth, low efficiency, long carburizing time, etc., and achieve small particle size , The process is simple, the effect of improving the carburizing efficiency

Active Publication Date: 2018-10-02
SICHUAN UNIV
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  • Claims
  • Application Information

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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 when preparing hard alloys with graphite-rich surfaces. Cemented carbide blank, and then amorphous Si-C-O coated TiH 2 core / shell structure powder, graphene, NaHCO 3 When mixed planetary ball milling, it is evenly mixed to form a hydrogen-containing carburizing medium, and then the porous green body is put into the carburizing medium and compacted, and finally the cemented carbide with a graphite-rich surface is realized during liquid phase sintering

Method used

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  • A kind of preparation method of cemented carbide with graphite-rich phase on the surface

Examples

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Effect test

example 1

[0018] Example 1: Realize the cemented carbide preparation method of surface graphite-rich phase according to the following steps:

[0019] (1) Preparation of cemented carbide blanks containing carbide-forming elements: Weigh various raw material powder ingredients, Co accounts for 7wt%, Mo accounts for 1wt%, W accounts for 1wt%, and WC is the balance; weigh The powder is mixed and ball milled for 29 hours, filtered with a 400-mesh screen, dried at 89°C, mixed with a butadiene rubber molding agent according to 58% of the weight of the cemented carbide powder, and pressed under a pressure of 310MPa to obtain a cemented carbide green body; The alloy green body is heated to 580°C in a vacuum sintering furnace, the temperature rise rate is 1°C / min, the vacuum degree is 6Pa, and it is kept for 1h to form a cemented carbide body containing carbide-forming elements;

[0020] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size of 0.5 μm 2 T...

example 2

[0023] Example 2: Realize the cemented carbide preparation method of surface rich graphite phase according to the following steps:

[0024] (1) Preparation of cemented carbide blanks containing carbide-forming elements: Weigh various raw material powder ingredients, Co accounts for 18wt%, W accounts for 3wt%, and WC is the balance; the weighed powders are mixed and passed through Ball mill for 65 hours, filter with 400-mesh screen, dry at 90°C, mix 110% of the weight of cemented carbide powder with butadiene rubber molding agent, and press molding under 360MPa pressure to obtain cemented carbide green body; cemented carbide green body is vacuum In the sintering furnace, the temperature is raised to 660°C, the temperature rise rate is 3°C / min, the vacuum degree is 10Pa, and the temperature is kept for 1h to form a cemented carbide blank containing carbide-forming elements;

[0025] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size o...

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Abstract

The invention discloses a method for preparing cemented carbide with a graphite-rich surface, which is characterized in that it first heats at 550-700°C for 1-2 hours to form a cemented carbide body containing carbide-forming elements; then amorphous Si-C ‑O core / shell structure powder coated with TiH2, graphene with a thickness of less than 3nm, a layer number of less than 3 layers and a specific surface area greater than 250m2 / g, and NaHCO3 are mixed according to weight percentage 2:3:1 to prepare a hydrogen permeable carbon medium; then embed the green body in a hydrogen-containing carburizing medium and compact it under a pressure of 5-15MPa; finally carry out liquid phase sintering to prepare a cemented carbide with a graphite-rich surface. The invention overcomes the problems of serious crystal grain growth, long carburizing time and low efficiency in the existing technology, and realizes the preparation of hard alloy with graphite-rich surface in the sintering process.

Description

technical field [0001] The invention relates to a method for preparing cemented carbide, in particular to a method for preparing cemented carbide with a graphite-rich surface, belonging to the field of hard materials. Background technique [0002] The composition and performance of traditional hard alloys are basically the same from the outside to the inside, which limits the application of traditional hard alloy materials. This internal contradiction existing in cemented carbide can be resolved by adopting new material preparation technology and changing the distribution characteristics of cemented carbide microstructure. Through surface carburizing, its surface can be used to realize self-lubrication and improve its surface friction and wear performance. [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 carbur...

Claims

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Application Information

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