Gray, hexagonal, semi-conducting and diamagnetic. The natural mineral is a tungsten ore. Layered structure, easy to dissociate, with similar lubricating properties to graphite. Used as a lubricant, such as for aerosols.
Uses: Can be used as a lubricant. The performance is better than molybdenum disulfide, the friction coefficient is lower, and the compressive strength is larger. Used alone in high temperature, high pressure, high speed, high load, and equipment operating in chemically active media. Forging and stamping lubricants formulated with other materials can extend the life of the mold and improve the smoothness of the product. Filling materials formulated with PTFE and nylon can be used to make self-lubricating parts.
Uses: A new type of solid lubricant for lubrication under high temperature, high pressure, high load and high vacuum conditions. Adding self-lubricating components in engineering plastics, or mixing with some volatile solvents, spraying on metal surfaces, used in punching and forging to improve the life of the mold and the smoothness of the workpiece.
Production method: roasting decomposition method, tungstic acid and ammonia water are reacted under stirring at 57-60 ° C for 3 h, and the natural precipitation is allowed to settle for more than 16 h, and the generated ammonium tungstate is further reacted with hydrogen sulfide gas to form ammonium tetrathiotungstate by high temperature roasting. Decomposed into tungsten disulfide.
