Preparing method for high-toughness and heat resisting TiC/TiN steel bond hard alloy

Abstract

The invention relates to a preparing method for a high-toughness and heat resisting TiC / TiN steel bond hard alloy. The preparing method is characterized that one of TiO2 powder, TiH2 powder and Ti powder and colloidal graphite powder are prepared according to the C / Ti atomic ratio of 0.7-1.1, one of the TiO2 powder, the TiH2 powder and the Ti powder and urea ((NH2)2CO) are prepared according to the N / Ti atomic ratio of 0.4-1.1, and accordingly in-situ synthesized TiN mixed powder is prepared; ferro-molybdenum powder, ferro-vanadium powder, ferro-chromium powder, ferro-manganese powder, ferro-silicon powder, iron powder, ferro-boron powder, nickel powder, colloidal graphite and rare earth raw materials are prepared according to the needed proportion for the bonding phase metal chemical component mass ratio to be arranged into a steel ball mill, absolute ethyl alcohol serving as a medium and PVA are added, after ball milling and slurry drying, pressing forming is conducted, and the steel bond alloy is obtained through sintering. The in-situ reaction synthesizing technology and the liquid phase sintering technology are combined, reinforced particles are fine in size, the surfaces are free of sharp corners, base body interface bonding is good, and the interface is clean. Through the method for preparing the steel bond alloy, the comprehensive mechanical performance of the alloy can be improved, cost is low, and the technology is easy and convenient to conduct.

Description

[0001] field of invention [0002] The invention relates to a preparation method of a high-strength, toughness, and heat-resistant TiC / TiN steel-bonded hard alloy, in particular to the technical field of preparing a high-strength, toughness, and heat-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 advantag...

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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.