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Comparison of properties of tungsten disulfide and molybdenum disulfide

  • Mosten
  • 8 May

Molybdenum and tungsten are homogeneous chemical elements. Tungsten is heavier than molybdenum and has more stable chemical properties. What about their sulfide properties?

Tungsten disulfide can replace almost all applications of molybdenum disulfide and graphite, and its application is more extensive.

Molybdenum disulfide powder is widely used, mainly because of its cheap price, good effect, strong market supply, and continuous innovation in quality. molybdenum disulfide is the main component of molybdenite. its preparation method: molybdenite concentrate is prepared by repeated stirring treatment with hydrochloric acid and hydrofluoric acid under direct steam heating, washing with hot water, centrifugation, drying and crushing. hydrogen sulfide gas is introduced into ammonium molybdate solution to form ammonium thiomolybdate, which is changed to molybdenum tri sulfide precipitation with hydrochloric acid, then centrifuged, washed, dried, crushed, and finally heated to 950°C desulfurization can be obtained.

Actually, tungsten disulfide is not a new chemical product, its use history is as long as molybdenum, because the price is high, so it is ignored by many people, it is first used in NASA aerospace, aviation, military, automobile industry and other fields. A few years ago, the price of tungsten disulfide was ten times that of molybdenum disulfide. But now that the price of molybdenum disulfide has soared, nearly doubling every six months, the prices of these two raw materials are not much different.

Therefore, it is more cost-effective to choose tungsten disulfide with better dry rubbing performance, which can improve the quality of end products and enhance their competitiveness.

Tungsten disulfide preparation method: tungsten reacts very slowly with liquid sulfur. WS2. can be formed by sulfur vapor in hot tungsten The mixture of tungsten and stoichiometric sulfur can be formed 24 h, at 800℃ in nitrogen atmosphere WS2, if the reaction is 6 MPa and 1800℃, the orthogonal crystal form can be formed.