Research Of Preparation Technology Of Ultra-fine Molybdenum Disulfide By Direct Reduce

Molybdenum disulfide powder is a good kind of solid lubricant which plays an important role in industry. In this paper, the preparation technology of amorphous ultra-fine undefined molybdenum disulfide was researched. The hydroxylamine hydrochloride was used as a reduction to reduce the sodium molybdate; and the reduction-product was calcined in N₂. The hexadecyltrimethylammonium chloride, polyethylene glycol and ultrasonic field-generated invigoration effect were added in the process to control the grain size of molybdenum disulfide powder, and improve scatter dispersion and the nature of hydrophobic on controlling factors, such as grain conglobation and surface modifying and so on.The research results of preparation of amorphous molybdenum disulfide proved: thioacetamide and polyethylene glycol was the better source of sulfur and dispersant agent. The better experiment technological conditions were: reducing reaction temperature 90℃, mixture ratio of hydrochloride and hydroxylamine 1:1.2, primary density of hydrochloride 0.025mol/L; curing reaction temperature 90℃, curing reaction time 50min; precipitating reaction temperature 55℃, mixing speed 300r/min, pH 1.0, precipitating reaction time 40min; capacity of polyethylene glycol (0.5%(wt)) 10ml, ultrasonic wave frequency 40kHz, ultrasonic wave power 80W, ultrasonic wave actuation duration 30min. The characters of molybdenum prepared with the better experiment technological conditions were: molybdenum disulfide grain presented globular shape with almost the same size and homogeneous dispersion. The average grain size was 80nm.The better experiment technological conditions of scarifying experiment were: temperature 90℃, time 10min. Crystalline molybdenum disulfide that we prepared in these technological conditions was globular shape grain. The average grain size was 300nm. The calculation of experiment proved that molybdenum crystalline grain growth index was 3.6 and crystalline grain growth activation energy was 122.83kJ/mol. It was found the grain growth was controlled by a diffusion mechanism.On the contrast, It was found that polyethylene glycol and ultrasonic field-generated invigoration effect all can relieve the agglomeration of particles and synthetic smaller grain size molybdenum disulfide powder. Molybdenum disulfide which was dressed by hexadecyltrimethylammonium chloride had better scatter dispersion and the nature of hydrophobic which adapts industry application.