Preparation method for spherical tungsten powder

Preparation method for spherical tungsten powder

  • CN 102,935,515 A
  • Filed: 11/21/2012
  • Published: 02/20/2013
  • Est. Priority Date: 11/21/2012
  • Status: Active Application
First Claim
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1. the preparation method of a globular tungsten powder is characterized in that, specifically may further comprise the steps:

  • A. take tungsten powder in irregular shape as raw material, being placed on and being dried to moisture content under 40 ~ 90 ℃

    is below 5%;

    B. the tungsten powder that will process through super-dry stirs in uncovered steel drum, heats simultaneously steel drum and carries out oxidation processes, and temperature is 400 ~ 550 ℃

    , when obvious appearance stopped heating during fine powder more;

    C. will through the powder of B step process, join OH -Concentration is in the alkaline solution of 5 ~ 10mol/L, and the ratio of powder and solution is 1g;

    3ml ~ 1g;

    12ml, and reaction temperature is 40 ~ 80 ℃

    , leaves standstill after fully stirring, until solution is transparent and precipitation color and former tungsten powder solid colour, removes supernatant liquor;

    D. clean with the alkali cleaning powder of deionized water to the C step, the ratio of powder and deionized water is 1g/30ml ~ 1g/50ml, cleans with absolute ethyl alcohol again, and powder and absolute ethyl alcohol ratio are 1g/30ml ~ 1g/50ml;

    E. will carry out drying under the protective atmosphere protection through the powder that the D step is cleaned, baking temperature is 40 ~ 80 ℃

    , until moisture content is below 5%.

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