Iron-base powder metallurgy material for high pressure valve and preparation method thereof

Abstract

The invention relates to an iron-base powder metallurgy material for a high pressure valve. The iron-base powder metallurgy material is made of the following raw materials in parts by weight: 4 to 5 parts of nano carbonyl iron powder, 1.0 to 1.3 parts of fatty acid diamide, 10 to 20 parts of Co, 4 to 5 parts of Ni, 2 to 3 parts of Sn, 1 to 1.5 parts of Nb2O5, 2 to 3 parts of Bi2o3, 8 to 12 parts of WC, 5 to 7 parts of Al2O3, 4 to 6 parts of TaC, 3 to 4 parts of LaB, 0.5 to 0.6 part of silane coupling agent kh-550, appropriate amount of 1% sodium carbonate solution, appropriate amount of water, 4 to 4.5 parts of sodium hypophosphite, 0.4 to 0.6 part of polyethylene glycol, 50 to 55 parts of 2Mol / L copper sulfate solution, 2 to 3 parts of wetting additive and 56 to 59 parts of iron powder. The iron-base powder metallurgy material is suitable for producing a valve with nominal pressure being less than or equal to 32MPa; by adding WC, Al2O3, TaC and LaB, the heat resistance and corrosion resistance of the valve can be improved, and mediums such as water, steam, hydrogen, ammonium, nitrogen, petroleum and the like at the temperature of -30 to 425 DEG C can be conveyed.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to an iron-based powder metallurgy material for high-pressure 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