Effect of annealing environment on the crack healing and mechanical properties of (Mo0.97Nb0.03)(Si0.97Al0.03)2

Effect of annealing environment on the crack healing and mechanical properties of (Mo0.97Nb0.03)(Si0.97Al0.03)2
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退火环境对(Mo0.97Nb0.03)(Si0.97Al0.03)2裂纹愈合及力学性能的影响

DOI:
10.1016/j.jallcom.2015.02.072
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发表时间:
2015-06
影响因子:
6.2
通讯作者:
Farid Akhtar
Farid Akhtar
中科院分区:
材料科学2区
文献类型:
--
作者:
Xiaohong Wang;Zhi Sun;Peizhong Feng;Farid Akhtar

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研究了Nb和Al合金化MoSi 2缺口陶瓷在900 ~ 1500 °C空气、真空、氩气和氮气环境中热处理过程中的裂纹愈合。缺口(Mo0.97Nb0.03)(Si0.97Al0.03)2陶瓷在空气中热处理后弯曲强度有明显恢复。在1200 °C空气中热处理后,发现弯曲强度恢复率为250%。氧化层的形成愈合了在空气中退火过程中的裂纹。在真空、氩气和氮气气氛下退火时,裂纹愈合的主要机制是再烧结。在1200 °C真空热处理后,发现弯曲强度恢复率为208%。
Crack healing of Nb and Al alloyed MoSi2notched ceramics had been investigated during thermal treatment from 900 to 1500 °C in air, vacuum, argon and nitrogen environments. Notched (Mo0.97Nb0.03)(Si0.97Al0.03)2ceramics showed significant recovery of bending strength after heat treatment in air. Bending strength recovery of 250% was found after heat treatment in air at 1200 °C. Oxide layer formation healed the cracks during annealing in air. Re-sintering was found dominant mechanism of crack healing during annealing in vacuum, argon and nitrogen atmosphere. Bending strength recovery of 208% was found after heat treatment in vacuum at 1200 °C.
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