钼金属板材热态强力旋压工艺研究

The service process of a spun molybdenum crucible used for sapphire crystal growth and effects of different parts of the crucible on the growth of sapphire crystal were analyzed; based on the analyses, the failure mode and elements of quality control of spun molybdenum crucible were proposed. The hot spinning processing of molybdenum plate was developed, and its processing parameters, including spinning wheel load factors (roller forming angle α, roller radius D_ρ, roller radius ρ, adjusting angle β and wheel layout), wall thinning rate ψ_t, roller feed f, core mould-roller clearance δ, spindle speed n, spinning temperature, heating method, annealing temperature and annealing time, were experimentally studied. The affecting factors, causes and solutions of molybdenum crucible defects, including outer and inner cracks in bottom corners, deep burrs in outside surface of side walls, cracks in open ends, collapsed bottom corner, insufficient wall thickness, circumferential uneven thickness and size errors in open ends, were comprehensively discussed. Meanwhile the evolution law of microstructure during the spinning process of molybdenum metal was presented.