Sub-micro grain hard alloy anvil and preparation method thereof

Abstract

The invention discloses a sub-micro grain hard alloy anvil and a preparation method thereof. The sub-micro grain hard alloy anvil comprises the following alloy components: WC (Wolfram Carbide), 10% of Co, 0.4-0.6% of Cr3C2 and 0.2-0.3% of VC (Vitamin C); the particle size of an alloy crystal is 0.8-0.9mum; the porosity of an alloy is A00B00C00; the hardness of the alloy is 90.5-91.5HRA; the coercive force of the alloy is 205-245Oe. The preparation method comprises the steps: with WC powder with the Fisher particle size of 1.0-1.2mum and Co powder with the Fisher particle size of 0.8-1.0mum as raw materials, adding Cr and V additives in the alloy in the preparation process of the WC powder; preparing an alloy mixture by using a rolling wet grinding process, wherein the wet grinding time is 55-60h, and the mass ratio of a ball material is 4:1; drying and granulating the wet ground mixture by using a spray drying granulation method; and sintering a pressed anvil blank at the temperature of 1400-1410 DEG C by using a pressure sintering process, wherein the pressed anvil blank is obtained through cold isostatic compaction; and carrying out copious cooling treatment on the sintered pressed anvil blank by using liquid nitrogen with the temperature of 180 DEG C below zero to 190 DEG C below zero, and then, carrying out subsequent reinforcement treatment on a refined anvil by using a 350-400 DEG C medium-temperature tempering treatment process.

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 cryogenic treatment of cemented carbide top hammer (Fan Lian. Research on cryogenic treatment of YL20.3 cemented carbide for top hammer. Master's degree 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 ultra-fine-grained cemented carbide with alloy grain size <0.5 μm 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