High-temperature resistant and high-pressure resistant powder metallurgy material for valve and preparation method of high-temperature and high-pressure resistant powder metallurgy material

Abstract

The invention discloses a high-temperature resistant and high-pressure resistant powder metallurgy material for a valve. The high-temperature and high-pressure resistant powder metallurgy material is prepared from the following raw materials in parts by weight: 2-3 parts of LaO.6Al2O3, 3.8-4.2 parts of Mo, 0.3-0.6 part of Cu, 0.1-0.2 part of As, 0.2-0.3 part of Ho, 2-2.6 parts of nano iron powder, 16-19 parts of titanium carbonitride, 0.6-0.9 part of nano tungsten powder, 0.3-0.5 part of nano carbon black, 0.3-0.4 part of a silane coupling agent kh-550, a proper amount of 1% sodium carbonate solution, a proper amount of water, 4.5-5.5 parts of sodium hypophosphite, 0.4-0.6 part of polyethylene glycol, 60-65 parts of 2Mol / L copper sulfate solution, 2-3 parts of a wetting assistant and 73-76 parts of iron powder. The LaO.6Al2O3, the titanium carbonitride and the nano tungsten powder are added to the material for the valve disclosed by the invention, so that the heat resistance of the material is improved; the material has the advantages of high strength, excellent heat resistance and long service life, and is suitable for preparation of the valves which work at high temperature and high pressure.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a high-temperature and high-pressure resistant 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...

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