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Method of preparing nano-zirconia-doped tungsten oxide

A nano-zirconia and tungsten oxide technology, applied in the field of powder metallurgy, can solve the problems of coarse grains of tungsten alloys, and achieve the effects of uniform distribution of powder particles, solving coarse grains and simple equipment.

Active Publication Date: 2017-01-11
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides a method for preparing nano-sized zirconia-doped tungsten oxide, which has a simple process and effectively solves the problem of coarse tungsten alloy crystal grains

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  • Method of preparing nano-zirconia-doped tungsten oxide
  • Method of preparing nano-zirconia-doped tungsten oxide

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Embodiment 1

[0028] A method for preparing nano zirconia doped tungsten oxide, comprising the following steps:

[0029] Step 1. At room temperature, prepare an aqueous distilled water solution of ammonium metatungstate with a molar concentration of 0.09mol / L, and under continuous stirring conditions, add concentrated nitric acid solution drop by drop into the distilled water solution of ammonium metatungstate until the solution The pH value reaches 0.1-1.5, for later use;

[0030] Step 2, at room temperature, prepare the mixed distilled water aqueous solution of zirconium nitrate and urea according to the mol ratio of zirconium nitrate and urea is 0.3:1, standby;

[0031] Step 3. According to the molar ratio of ammonium metatungstate, zirconium nitrate and urea is 2.80:0.3:1, add the solutions prepared in step 1 and step 2 into the autoclave respectively, and react at 170°C for 18 hours. After the reaction is complete , take out and air cool to room temperature;

[0032] Step 4. Pour out...

Embodiment 2

[0036] A method for preparing nano zirconia doped tungsten oxide, comprising the following steps:

[0037] Step 1. At room temperature, prepare an aqueous distilled water solution of ammonium metatungstate with a molar concentration of 0.15mol / L, and add concentrated nitric acid solution drop by drop into the distilled water solution of ammonium metatungstate until the solution is pH value reaches 1.5, standby;

[0038] Step 2, at room temperature, prepare the mixed distilled water aqueous solution of zirconium nitrate and urea according to the mol ratio of zirconium nitrate and urea as 0.5:1, standby;

[0039] Step 3. According to the molar ratio of ammonium metatungstate, zirconium nitrate and urea is 2.77:0.5:1, add the solutions prepared in step 1 and step 2 into the autoclave respectively, and react at 200°C for 24 hours. After the reaction is complete , take out and air cool to room temperature;

[0040] Step 4, pour out the supernatant of the solution obtained in step...

Embodiment 3

[0044] A method for preparing nano zirconia doped tungsten oxide, comprising the following steps:

[0045] Step 1. At room temperature, prepare an aqueous distilled water solution of ammonium metatungstate with a molar concentration of 0.12mol / L, and add concentrated nitric acid solution drop by drop into the distilled water solution of ammonium metatungstate until the solution is pH value reaches 0.8, standby;

[0046] Step 2, at room temperature, prepare the mixed distilled water aqueous solution of zirconium nitrate and urea according to the mol ratio of zirconium nitrate and urea as 0.05:1, standby;

[0047] Step 3. According to the molar ratio of ammonium metatungstate, zirconium nitrate and urea is 0.25:0.05:1, add the solutions prepared in step 1 and step 2 into the autoclave respectively, and react at 185°C for 21 hours. After the reaction is complete , take out and air cool to room temperature;

[0048] Step 4. Pour out the supernatant of the solution obtained in st...

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Abstract

The invention relates to a method of preparing nano-zirconia-doped tungsten oxide. The method includes the following steps that a distilled water solution of ammonium metatungstate is prepared, a concentrated nitric acid solution is added dropwise into the distilled water solution of ammonium metatungstate under the condition of continuous stirring, ammonium metatungstate, zirconium nitrate and urea are subjected to hydrothermal reaction according to the molar ratio of (0.25-2.8):(0.05-0.5):1, supernate prepared through the reaction is poured out, sediment is washed with distilled water until the pH value of the washing solutions of the two times is 6-8, the washing solutions of the two times are mixed and stirred for 2 h through a stirrer after being mixed uniformly, suction filtration, drying and calcining are carried out on the prepared mixed solution, and the product is prepared after air cooling to room temperature. The method is simple in process, and effectively solves the problem of large tungsten alloy grains.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a method for preparing nano zirconia doped tungsten oxide. Background technique [0002] Because tungsten has high density, high melting point, excellent high temperature strength, good creep resistance, outstanding thermal conductivity and electron emission performance, tungsten and its alloys are widely used in electronics and electric light source industries, and also in aerospace, casting, weapons, etc. In other departments, it is used to make rocket nozzles, die-casting molds, armor-piercing projectile cores, contacts, heating elements and heat shields. However, due to the uneven distribution of the alloy powder prepared by the traditional powder making process (such as mechanical mixing method), the coarse particles cannot reach the nanometer level. The method prepares nano tungsten oxide as a tungsten source for preparing tungsten composite materials, and adopts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02C01G25/02B82Y30/00
CPCB82Y30/00C01G25/02C01G41/02C01P2002/72C01P2004/04C01P2004/64C01P2004/82
Inventor 魏世忠徐流杰王长记潘昆明李秀青张国赏李洲王喜然
Owner HENAN UNIV OF SCI & TECH
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