纳米ZrO_2陶瓷粉料的烧结性研究

SINTERABILITY OF NANOSIZED ZIRCONIA CERAMICS

采用共沉淀一球磨法制得纳米级氧化铝粉料，用SEM对其烧结性作了研究。SEM结果表明不同的烧结制度导致烧结体的显微组织有很大的差异：900℃～1300℃是烧结的重要阶段，这期间晶粒由大→小→大的变化，而气孔则由大→小，1300℃时烧结体的气孔形状、数量和位置分布与烧结终期极为相似；在1300℃以上晶粒进一步长大，气孔作自身调整直至烧结结束。

SEM results of the sinterability of nanozirconia, which was prepared by cooperationmilling method, show thatheating rate can influence the sintering behavoiur of nanozirconia powders containing agglomerates, homogeneous mi-crostructure can be achieved by suitable heating rate, especially at 900℃ t0 1300℃, in which process grain sizes re-duce and grow gradully afterwards while pore sizes become less, moreover, the shaopes, numbers and sites of pores arevery similar between as-fired sample and sample sintered at 1300t, Then, the grain sizes grow further and poreschange themselves continually.