研究粉末熔化处理工艺的前驱粉末在不同热处理制度下淬火形成的Y_2BaCuO_5粒子形貌,并与熔融织构生长工艺和熔化粉末熔化生长工艺中的Y_2BaCuO_5粒子进行比较,揭示粉末熔化处理工艺中等轴状Y_2BaCuO_5粒子的形成机制.结果表明,粉末熔化处理工艺中Y_2BaCuO_5粒子形成等轴状的原因是其前驱粉末的组成有利于减少在包晶反应过程中形成过量的液相,抑制了Y_2BaCuO_5粒子的择优生长.
The morphology of powder melting processed Y_2BaCuO_5 particles quenched in different heat treatment system was investigated, and compared with that of the Y_2BaCuO_5 particles in melt texture growth process and melt powder melt growth process. The forming mechanism of equiaxed Y_2BaCuO_5 particles in powder melting process was revealed. The results show that the composition of precursor powder make the excess liquid phase in powder melting process decrease, which inhibits the preferential growth of Y_2BaCuO_5 particles.
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