Preparation method of high-strength-and-toughness high-wear-resistance TiC/TiN steel bond hard alloy

Abstract

The invention relates to a preparation method of high-strength-and-toughness high-wear-resistance TiC/TiN steel bond hard alloy. The preparation method of the high-strength-and-toughness high-wear-resistance TiC/TiN steel bond hard alloy is characterized in that one of TiO2 powder, TiH2 powder and Ti powder is mixed with aquadag powder with the atomic ratio of C/Ti being 0.7-1.1, and one of the TiO2 powder, the TiH2 powder and the Ti powder is mixed with carbamide ((NH2) 2CO ) with the atomic ratio of N/Ti being 0.4-1.1 and made into in-situ synthesized TiN mixed powder; ferrochromium powder, ferromolybdenum powder, ferrovanadium powder, ferrotungsten powder, ferroniobium powder, nickel powder, ferroboron powder, iron power, aquadag and rare earth raw materials are mixed according to the needed chemical component mass ratio of adhesive phase metal and placed in a steel ball mill, absolute ethyl alcohol is added and used a medium, and PVA is also added; and after ball milling, slurry is dried, and then the steel bond hard alloy is obtained through pressing forming and sintering. According to the preparation method of the high-strength-and-toughness high-wear-resistance TiC/TiN steel bond hard alloy, the in-situ reaction and synthesis technology and the liquid phase sintering technology are combined, the reinforced particles are fine in size, the surfaces of the particles are free of sharp corners, matrix interface bonding is good, and the matrix interface is clean. By the adoption of the preparation method of the steel bond hard alloy, the comprehensive mechanical performance of the prepared steel bond hard alloy can be improved, the cost is low, and the technology is simple and convenient.

Description

[0001] field of invention [0002] The invention relates to a preparation method of a high-strength, toughness and high wear-resistance TiC / TiN steel-bonded hard alloy, in particular to the technical field of preparing high-strength, toughness and high wear-resistant TiC / TiN steel-bonded hard alloy by a reaction sintering method. [0003] Background of the invention [0004] Cemented carbide (WC-Co alloy) is one of the most commonly used materials in the cutting tool industry. Due to the high cost and toxicity of cemented carbide raw materials, in recent years, material workers have begun to look for alternative materials to replace WC-Co cemented carbide Materials, one factor that plays a driving role is that the cost of Co raw materials has risen in recent years, and the price fluctuates greatly; the other factor is that with the continuous development of modern industry, higher requirements are put forward for cemented carbide materials. Alloy materials begin to lose their a...

AI Technical Summary

Problems solved by technology

[0024] However, the in situ synthesis method also has many disadvantages: the reinforced particles are limited to thermodynamically stable particles in a specific matrix; the generated ones are relatively complex and difficult to control; After the bit particles are formed, they often segregate in dendrite gaps or grain boundaries during the casting process, which adversely affects the structure and properties of the material, and the processability is poor, the preparation cost is higher than the existing process, and it is not suitable for large-scale production.