材料科学
热冲击
兴奋剂
陶瓷
机制(生物学)
热的
休克(循环)
热力学
矿物学
复合材料
光电子学
物理
量子力学
医学
内科学
化学
作者
Yiming Yu,Yaowu Wei,Kui Liu,Bo Chen,Junfeng Chen
摘要
Abstract This paper aims to improve the density and thermal shock resistance of Y 2 O 3 ceramics for the preparation of ultra‐pure high‐temperature alloy crucible materials. The doping effect of MgF 2 content on the densification behavior, physical properties, and thermal shock resistance of Y 2 O 3 ceramics was systematically investigated in this paper. The results suggested that the presence of MgF 2 greatly promoted the growth of Y 2 O 3 grains and the transformation of the pore structure by liquid‐phase sintering. And the mechanical properties of the MgF 2 ‐doped Y 2 O 3 ceramics were significantly improved. Besides, the marked improvement in the thermal shock resistance of MgF 2 ‐doped Y 2 O 3 ceramics was attributed to the synergistic action resulting from the growth of grain size and the enhancement of the crack deflection effect. In particular, the relative density of Y 2 O 3 ceramics doped with 1.5 wt% MgF 2 reached 96.4% and the residual flexural strength ratio after thermal shock achieved 45.0%, showing an excellent application prospect.
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