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对机械合金化制备的玻璃工业中用作结构零件的Pt-5%ZrO2(体积分数)的进行表征。通过锆丝电爆炸法制备氧化锆(ZrO2)纳米颗粒(粒径<100 nm),并在室温下与铂粉(粒径<44?m)球磨2~72 h。普通球磨至48 h时,铂粒径遵循经典的递减趋势,至72 h时观测到颗粒团聚现象。晶粒尺寸演变规律与颗粒尺寸规律相似,48 h后减至50 nm左右。但是,铂晶粒的均方根应变规律相反,一直在增长,直至48 h时得到最大值,然后出现弛豫。粉末球磨48 h后,采用放电等离子体烧结制成块体。根据测量得到烧结体的质量损失表明:合金虽然相对密度较低,但有较好的热稳定性。
Characterization of Pt-5% ZrO2 (volume fraction) used as a structural part in the glass industry prepared by mechanical alloying. Zirconium oxide (ZrO2) nanoparticles (particle size <100 nm) were prepared by zirconia wire explosion method and ball milled with platinum powder (particle size <44 μm) at room temperature for 2 ~ 72 h. After 48 h of ordinary ball milling, the particle size of platinum followed the classical decreasing tendency, and the particle agglomeration was observed at 72 h. The law of grain size evolution is similar to that of particle size, and is reduced to about 50 nm after 48 h. However, the law of root mean square strain of platinum grains is opposite and has been increasing until the maximum value is reached at 48 h, then relaxation occurs. After milling for 48 h, the powder was sintered by spark plasma. According to the measurement, the mass loss of the sintered body shows that the alloy has better thermal stability though its relative density is lower.