Cracking-resistant iron-base powder metallurgy material used for valve and preparation method of cracking-resistant iron-base powder metallurgy material

Abstract

The invention discloses a cracking-resistant iron-base powder metallurgy material used for a valve. The cracking-resistant iron-base powder metallurgy material used for the valve is prepared from the following raw materials in parts by weight: 0.2-0.4 part of stearic acid boron, 3-4 parts of aluminum nickel alloy powder, 3-4 parts of nickeling silicon carbide crystal whisker, 3-4 parts of TiO2, 1-1.5 parts of fumed silica, 0.4-0.6 part of palm wax, 1-2.6 parts of nanometer boron fiber, 1-1.5 parts of cordierite powder, 2-2.6 parts of aluminium titanate, 0.3-0.4 part of silane coupling agent kh-550, a proper quantity of 1% sodium carbonate solution, a proper quantity of water, 2.5-3.5 parts of sodium hypophosphite, 0.4-0.6 part of polyethylene glycol, 30-35 parts of 2mMol / L copper sulphate solution, 2-3 parts of wetting accessory ingredient and 77-82 parts of iron powder. The nanometer boron fiber and the nickeling silicon carbide crystal whisker are added into the valve material to increase compatibility and prevent cracking while the toughness, the heat resistance and the impact strength resistance of valve materials are increased.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to an anti-cracking iron-based powder metallurgy material for valves and a preparation method thereof. Background technique [0002] A valve is a device used to control the direction, pressure, and flow of a fluid in a fluid system. It is a device that makes or stops the flow of media (liquid, gas, powder) in piping and equipment and controls its flow. When the medium and working conditions passed by the valve are different, there are different requirements for the material of the valve, and there are different requirements for the performance of the material such as temperature resistance, corrosion resistance, and strength. The working pressure of the valve can range from 0.0013MPa to ultra-high pressure of 1000MPa, and the working temperature can range from ultra-low temperature of -270°C to high temperature of 1430°C. [0003] Valve materials can be made of powder met...

AI Technical Summary

Problems solved by technology

However, due to poor compatibility between non-metallic phase and metal phase, it is easy to cause segregation of components, poor structure uniformity, uneven strength, mottled appearance, poor running-in performance, poor wear resistance, can not withstand large pressure, severe heat decay, and crack resistance Poor performance, poor resistance to cold and heat fatigue, short service life