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采用粉末熔化工艺(PMP)制备YBa2Cu3O7-x先驱粉末。研究了在加热过程中加热速率和保温时间对其相成分的影响,并对粉末的显微结构进行了分析。通过高温X射线衍射仪原位研究了400℃/h和6000℃/h的加热速率对先驱粉末加热到包晶分解温度过程中的相变化过程。结果表明:加热速率为400℃/h时,先驱粉末会形成YBa2Cu3O7-x相;加热速率为6000℃/h时,则不会有YBa2Cu3O7-x相生成。通过研究不同保温时间对粉末熔化工艺先驱粉末的影响,得出YBa2Cu3O7-x相的形成区间,其结果有助于控制粉末熔化工艺的参数和理解工艺的本质。
YBa2Cu3O7-x precursor powder was prepared by powder melting process (PMP). The effects of heating rate and holding time on the phase composition were investigated. The microstructure of the powder was analyzed. The phase transformation of Pioneer powders to peritectic temperature was investigated by high temperature X-ray diffractometry in situ at 400 ℃ / h and 6000 ℃ / h. The results show that the precursor powder will form YBa2Cu3O7-x phase when the heating rate is 400 ℃ / h, and YBa2Cu3O7-x phase will not form when the heating rate is 6000 ℃ / h. By studying the influence of different holding time on the pioneer powder of the powder melting process, the formation interval of YBa2Cu3O7-x phase is obtained, and the results help to control the parameters of the powder melting process and understand the essence of the process.