Pressure-induced transparency of MgO, Al2O3, AlN, and cBN ceramics at room temperature

被引:7
作者
Su, Yuzhu [1 ]
Wang, Junpu [1 ]
Li, Xin [1 ]
Tang, Qiqi [1 ]
Yang, Jing [1 ]
Lei, Li [1 ,2 ]
Tian, Yi [1 ]
Wang, Zhiwei [1 ]
He, Duanwei [1 ,2 ]
机构
[1] Sichuan Univ, Inst Atom & Mol Phys, Chengdu 610065, Peoples R China
[2] Sichuan Univ, Minist Educ, Key Lab High Energy Dens Phys & Technol, Chengdu 610065, Peoples R China
关键词
Cold compression; X-ray diffraction; Transparent ceramics; Grain fracture; Re-bonded; STRENGTH; ALUMINA; SPINEL;
D O I
10.1016/j.ceramint.2021.04.110
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The in situ axial X-ray diffraction patterns of four ceramic powder samples (MgO, Al2O3, AlN, and cBN) that were compressed in a diamond anvil cell under uniaxial non-hydrostatic conditions were recorded. The microscopic deviatoric stress as a function of the pressure was determined from the X-ray diffraction peak broadening analysis: the curves increased approximately linearly with the pressure at the initial compression stage and then levelled off under further compression. Pressure-induced transparency was observed in all of the samples under compression, and the pressure at the turning point on the curves of the microscopic deviatoric stress versus pressure corresponded to the pressure at which the samples became transparent. Analysis of the microstructural features of the pressure-induced transparent samples indicated that the compression caused the grains to fracture, and the broken grains bonded with each other. We demonstrated that the ceramics' pressure-induced transparency was a process during which the grains were squeezed and broken, the pores were close between the grains, and the broken grains were re-bonded under compression.
引用
收藏
页码:21077 / 21082
页数:6
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