The,increases,retrofit,technol business, insurance The increases retrofit technology of molybdenum powder parti
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Relative fisher particle size is generally under 5¼m, the particle sizedistribution is basically showed normal distribution, bulk density is between0.9 ~ 1.3 g/cm3,the morphology of molybdenum powder is irregular particles, for poor mobility(Hall flow meter can not be measured) conventional molybdenum powder, there aremainly have three difficulties on preparing such molybdenum powder: large size,high density, good fluidity. The ideal molybdenum powder appearance which meets the requirements of these three points islarge diameter solid sphere, this is different from non-specifications looseparticles morphology of conventional molybdenum powder. In general, increasesretrofit technology of molybdenum powder can be divided into chemical methodand physical method. Chemical methods prepare large particle sizeammonium crystal block, in accordance with the hereditary principle, throughsubsequent calcination, reduction, prepared large-grained particles ofmolybdenum powder (conventional molybdenum powder particles are actually theaggregates of many small particles), followed by some mechanical treatment toobtain rounded shape, great density, large size molybdenum powder particles.This method is feasible theoretically, but prepares large single crystals ofammonium molybdate particles are more difficult, and the follow molybdenumpowder size and morphology hereditary quantitative rule are not clear, processis longer. Mechanical granulation technology, mechanicalpressing the mixed molybdenum powder which plus binder in the mold orgranulation equipment to obtain a certain size, then remove the binder,sintered into a certain intensity rule particles group. This method is simplein principle, but the experiments show that it is relatively simple to increasemolybdenum powder particle size, no significant improvements on liquidity. Plasma granulation technology, which applied in themetal powder change shape for a long time, the principle is that in protectiveatmosphere, through a certain way to put the powder into the plasma flame core,melting the powder particles at several thousand degrees Celsius, and thenself-balling by the surface tension during the free fall, after cooling, the sphericaldroplet become large size, high- density spherical powder. The powder obtainedin this way has good physical indicators, broad market prospects, but hasgreater technical difficulty, particularly in the powder delivery and keeping aprotective atmosphere, cooling and collecting the finished products are moredifficult, large equipment investment, difficult to keep in good repair. Fluidized bed reduction method, the fluidized bedreduction method of molybdenum powder is proposed by the American researchers,through two phases of fluidized bed reduction, directly reduce the granular orpowder form MoO3 into molybdenum powder. Phase 1 reduce the MoO3 into MoO2 at400 ~ 650 by using ammonia as fluidizedreducing gas; Phase 2 reduce MoO2 to Mo at 700 ~ 1400by using hydrogen as fluidized reducing gas. Since in the fluidized bed, thegas and the solid can be obtained the fullest contact, the bed temperature isuniform, so that the reaction speed is fast, can effectively control themolybdenum powder size and shape, molybdenum powder produced by this method isequiaxed particles, with good powder fluidity, the subsequent sintering has highdensity. This approach has not found information about its specific productionapplications. ArticleSource:http://www.mhcmp.com
The,increases,retrofit,technol