A kind of surface carburized gradient cemented carbide preparation method

A cemented carbide and surface carburizing technology, which is applied in metal processing equipment, metal material coating technology, solid-state diffusion coating, etc., can solve the problems of long carburizing time, low efficiency, and grain growth, and achieve improvement The effect of carburizing efficiency, simple process and small particle size
CN106987752BActive 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 surface carburized gradient cemented carbide, which is characterized in that it first heats the temperature at 550-750°C for 2-4 hours to form a cemented carbide product with a porosity of 25%-40% and removes the forming agent. blank; then SiO2-coated TiH2 core / shell structure powder, graphene with a thickness of less than 3nm, a number of layers less than 3 layers and a specific surface area greater than 250m2 / g, and BaCO3 are prepared by mixing 1:2:1 by weight percentage Hydrogen-containing carburizing medium; then the green body is buried in the hydrogen-containing carburizing medium and compacted under a pressure of 5-15MPa; finally, liquid-phase sintering is carried out to prepare a surface-carburized gradient cemented carbide. The invention overcomes the problems of serious grain growth, long carburizing time and low efficiency in the prior art, and prepares surface carburized gradient hard alloy in the sintering process.
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Description

technical field

[0001] The invention relates to a method for preparing hard alloy, in particular to a method for preparing surface carburized gradient hard alloy, which belongs to the field of hard materials. Background technique

[0002] As a new tool material, cemented carbide is based on refractory metal hard compounds (usually referring to carbides, nitrides, borides and silicides of transition elements in the periodic table of elements, etc.), based on iron group Metals (such as cobalt, nickel, iron) are used as bonding metals, which are high hardness and high wear resistance materials manufactured by powder metallurgy. However, it is difficult for homogeneous materials to meet more and more complex working conditions. With the concept of gradient cemented carbide, people pay attention to improving material properties by carburizing the surface.

[0003] CN102002664A discloses a preparation method of gradient structure cemented carbide. First, the surface oxidation met...

Claims

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