Preparation method of nano yttrium oxide dispersion strengthening tungsten alloy

Abstract

The invention provides a preparation method of a nano yttrium oxide dispersion strengthening tungsten alloy and belongs to the field of the manufacturing of powder used for powder metallurgy. The preparation method mainly comprises the following steps of: dissolving yttrium nitrite (Y(NO3)3.6H2O) in ethyl alcohol, and carrying out ball milling and mixing on yttrium nitrite and ammonium paratungstate (APT); after wet powder is dried by distillation, calcining for 20-150 minutes at the temperature of 400-900 DEG C to obtain nano yttrium oxide dispersion strengthening tungsten powder; then reducing by H2 for 30-150 minutes at the temperature of 600-1000 DEG C to prepare the nano yttrium oxide dispersion strengthening tungsten powder; and mixing 0.1-1% of Ni as an activated sintering agent, and carrying out compression moulding and H2 gas shield sintering or vacuum or HIP (hot isostatic pressing) sintering, so that the nano yttrium oxide dispersion strengthening tungsten alloy can be prepared. The preparation method provided by the invention has the advantages that the density can be 18.28-19.2g / cm<3>, and a yttrium oxide dispersed phase is fine and is uniformly distributed in tungsten crystal particles.

Description

technical field

[0001] The invention belongs to the field of powder manufacturing in powder metallurgy production technology, and relates to a preparation method of nanometer yttrium oxide dispersion strengthened tungsten alloy. Background technique

[0002] Tungsten has a high density (19.3 g / cm3), the highest strength among refractory metals, high elastic modulus, small expansion coefficient, low vapor pressure, excellent corrosion resistance, excellent thermal shock resistance and neutron radiation resistance Tungsten and its alloys are also widely used in the electronics and electric light source industries, as well as in aerospace, casting, weapons and other departments. Make rocket nozzles, die-casting molds, armor-piercing projectile cores, contacts, heating elements and heat shields, etc. In the aerospace industry, tungsten and its alloys can be used to make rocket nozzles without cooling, ion rings of ion rocket engines, jet vanes and positioning rings, hot gas ref...

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