Preparing method for zirconium boride dispersion strengthening tungsten powder

Abstract

The invention discloses a preparing method for zirconium boride dispersion strengthening tungsten powder, and relates to metal tungsten powder preparing. In the preparing method, deionized water, ammonium metatungstate and nano zirconium boride particles are prepared into a solution according to the needed proportion, after being subjected to uniform stirring and ultrasonic scattering, the solution is injected into liquid nitrogen, a frozen precursor is obtained, the frozen and dried precursor is roasted in the argon atmosphere with the temperature ranging from 400 DEG C to 600 DEG C, reduction of (500 DEG C-650 DEG C)*2h+ (700 DEG C-900 DEG C)*1 h is conducted in the hydrogen atmosphere, the temperature rise rate is (2-10) DEG C / min, the hydrogen flow is (0.1-1.0) L / min, and the dispersion strengthening tungsten powder is obtained. A tungsten base body obtained through the tungsten powder is sintered, particles are evenly dispersed in the interiors of crystal grains and grain boundaries, the size of the particles is the nano level, an obtained block is subjected to the mechanical test, and it is proved that the mechanical performance of the block is obviously improved. The dispersion strengthening tungsten prepared through the method has very high grain-boundary strength; and meanwhile, compared with traditional metal carbide and rare earth oxide dispersion particles, zirconium boride dispersion strengthening can reach a higher strengthening and toughening effect under the smaller adding amount.

Description

Technical field

[0001] The invention belongs to the preparation of metal materials, and specifically relates to the preparation of metal tungsten powder. Background technique

[0002] Tungsten is a metal material widely used in various industrial fields. It has the characteristics of high density, high melting point, high thermal conductivity, and low thermal expansion coefficient. It has unique applications in military industry, nuclear industry, and aerospace. Under these application conditions, tungsten needs to be subjected to coupled external field effects, such as high temperature, radiation and thermal shock. Under these conditions, tungsten materials are prone to failure, mainly due to brittle fracture under external force and re-heating under thermal effects. Crystal embrittlement. For tungsten whose crystal structure is body-centered cubic, its grain boundary strength is poor, which is the place where fracture easily occurs. Under the action of external load, intergra...

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