Tungsten Disulfide Powder / Tungsten Disulphide For Making Lubricants

 

Tungsten sulphide

Tungsten sulfide

CAS Number 12138-09-9

Product Name:Tungsten Disulphide

Synonyms Dithioxotungsten; Tungsten Disulphide; Tungsten(4+) Disulfide; Tungsten Disulfide; Tungsten Sulfide (ws2); Tungsten(iv) Sulfide

Molecular Formula WS2

Molecular Weight 247.97

InChI 1/2S.W/q2*-2;+4

EINECS 235-243-3

Physical Data

Appearance Dark Grey Powder

Density 7.5

Melting Point 1480oC

Other Cas No. 12651-32-0

tungsten sulfide is a fine crystal or powder with a gray metallic luster. It belongs to the six - party crystal system and has semiconducting and diamagnetic properties. The natural mineral is scheelite. Layered structure, cleavable lubricating properties, and similar graphite. Used as a lubricant, as for aerosols.

Physicochemical properties

Two tungsten sulfide is a compound of tungsten and sulfur. Its chemical formula is WS2, its molecular weight is 247.97, and its state is black gray powder. In nature, it appears as a scheelite, a deep gray trapezoid crystal solid. The relative density is 7.510.

It dissolves in cold water and dissolves in hot water [2]. Insoluble in hydrochloric acid and alkali (except for the mixture of concentrated nitric acid and hydrofluoric acid). Soluble in molten alkali and insoluble in alcohols. The density is 7.6g. Cm-3. with concentrated sulfuric acid, nitric acid, aqua thermal oxidant such as reaction, heating in air or oxygen can be transformed into WO3. The [1] is heated to 1250 C in a vacuum and decomposed into tungsten and sulfur. In the dry pure nitrogen gas flow, the mixture of three tungsten sulphide and sulfur is heated to 900 C, so that the excess sulfur is sublimated and the residue is two tungsten sulfide.

 

Preparation method

With four ammonium thiomolybdate as raw material, under the condition of air isolation, four thermal decomposition of ammonium thiomolybdate, when heated to 100~200 DEG C / h temperature gradient from room temperature to 700~1200 Deg. C, and on the temperature of 24~48 hours, and then at 30~110 Deg. C / hour temperature gradient to room temperature and discharge grinding

 

Industrial use:

It can be used as lubricant, which has better properties than molybdenum disulfide, low friction coefficient and high compressive strength. It is used alone for high temperature, high pressure, high speed, high load, and the equipment operating in chemical active medium. Forging and stamping lubricants with other materials can prolong the life of the mold and improve the finish of the product. The filler materials, such as polytetrafluoroethylene and nylon, can be used to make self - lubricating parts.

In addition, two tungsten sulfide can also be used as a catalyst in the field of petrochemical industry, which has the advantages of high cracking performance, stable and reliable catalytic activity and long service life.