A kind of submicron grain cemented carbide anvil and its preparation method

Abstract

The invention discloses a submicron grain hard alloy anvil and a preparation method thereof. The alloy composition of the submicron grain cemented carbide anvil is WC–10Co–0.4~0.6Cr3C2–0.2~0.3VC, the alloy grain size is 0.8~0.9μm, the alloy porosity is A00B00C00, and the alloy hardness is 90.5~91.5HRA , The coercive force of the alloy is 205-245Oe. WC powder and spherical Co powder with Fibonacci particle sizes of 1.0-1.2 μm and 0.8-1.0 μm were used as raw materials, and Cr and V additives in the alloy were added during the preparation of WC powder. The alloy mixture was prepared by rolling wet grinding process, the wet grinding time was 55-60h, and the mass ratio of ball to material was 4:1; the wet grinding mixture was dried and granulated by spray drying granulation method; The anvil compact formed by static pressure is sintered, and the sintering temperature is 1400-1410°C. Subsequent strengthening treatment is carried out on the finishing top hammer by adopting liquid nitrogen cryogenic treatment at -180--190°C, followed by medium-temperature tempering treatment at 350-400°C.

Description

Technical field [0001] The present invention involves a type of hammer and its preparation method, which is specifically involved in a sub -macrollagal hard alloy hammer and its preparation method. Background technique [0002] Hard alloy top hammer is an important consumer material for synthetic diamond and cubic boron nitride and hard alloy -diamond composite tablets. It is one of the important factors affecting the production cost of ultra -hard materials and hard alloy -diamond composite.During the synthesis of high -hard alloy hammers in the process of super -hard materials and hard alloy -diamond composite synthesis, it is suffering from high -temperature and high pressure transformer / force circulation effects, and the working environment is extremely harsh. ThereforeThe technology of alloy has high requirements.In order to reduce production costs, super -hard materials and hard alloy -in order to reduce production costs, they have done a lot of work on how to use the hard ...

AI Technical Summary

Problems solved by technology

There have been reports on the cryogenic treatment of cemented carbide top hammer (Fan Lian. Research on cryogenic treatment of YL20.3 cemented carbide for top hammer. Master's thesis of Hunan University, 2010.), but the research results show that cryogenic treatment can lead to YG8 Alloy flexural strength reduction

[0004]Cr3C2 and VC are the most suitable ultra-fine-grained cemented carbide with alloy grain size <0.5μm Commonly used grain growth inhibitors, but due to the poor thermal fatigue resistance of ultra-fine-grained cemented carbide, ultra-fine-grained cemented carbide cannot be used as a cemented carbide anvil material