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
CN107058842BActive Publication Date: 2018-10-02SICHUAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SICHUAN UNIV
Publication Date
2018-10-02

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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.
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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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