Corrosion-resistant iron-based powder metallurgy valve and preparation method thereof

Abstract

The invention discloses a corrosion-resistant iron-based powder metallurgy valve. The corrosion-resistant iron-based powder metallurgy valve is prepared from the following raw materials in parts by weight: 3-5 parts of hafnium boride, 4-6 parts of tantalum nitride, 1-2 parts of polymerization ferrophosphorus powder, 2-3 parts of copper powder, 0.4-0.8 part of boron stearate, 0.5-0.7 part of graphite, 6-9 parts of polycarbosilane, 10-15 parts of titanium powder, 3-5 parts of silicon-calcium-barium ally powder, 0.3-0.5 part of a silane coupling agent kh-550, 2-2.5 parts of ferrozirconium, a proper amount of 1% sodium carbonate solution, a proper amount of water, 0.4-0.6 part of zinc stearate, 2-3 parts of sodium hypophosphite, 0.3-0.4 part of polyethylene glycol, 20-25 parts of 2Mol / L copper sulfate solution, 2-3 parts of a wetting additive and 81-83 parts of iron powder. The valve material is uniform in structure, high in strength and high in tenacity; by adding hafnium boride, tantalum nitride and polymerization ferrophosphorus powder, the heat resistance, the abrasion resistance and the corrosion resistance of the valve are improved.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a corrosion-resistant iron-based powder metallurgy valve 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. [0003] There are many materials used in valves, among which powder metallurgy materials have simple manufacturing process, high manufacturing precision and cost saving, but there are many problems in powder metallurgy. For example, ordinary iron-based powder metallurgy materials have poor heat resistance, corrosion resistance, poor load-bearing capacity, and insufficient mechanical properties such as strength, hardness, and impact resistance. [0004] Metal has the characteristics of thermal shock resistance and good toughness, bu...

AI Technical Summary

Problems solved by technology

However, due to the poor compatibility between the non-metallic phase and the 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 cold and heat fatigue resistance, reduced performance and shortened service life