Transparent Alumina Nanoceramics Prepared under High Pressure and Low Temperature

被引：7

作者：

Zhang, Jiawei ^{[1
,2
]}

Liu, Fangming ^{[3
]}

Liu, Pingping ^{[3
]}

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

[3] Yangtze Normal Univ, Sch Mat Sci & Engn, Chongqing 408100, Peoples R China

来源：

ADVANCED ENGINEERING MATERIALS | 2023年 / 25卷 / 05期

关键词：

transparent alumina ceramics; high pressure; phase transition; POLYCRYSTALLINE ALUMINA; FRACTURE-TOUGHNESS; CERAMICS; NANOPARTICLES; FABRICATION; STANDARD; CORUNDUM; HARDNESS; AL2O3; SPS;

D O I：

10.1002/adem.202101413

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A transparent alumina ceramic with a transmittance of 71.7% at 640 nm is fabricated by sintering mixed metastable Al2O3 powder at 5.0 GPa/600 degrees C. The spherical starting particles are deformed and highly densified during compression, and transformed into alpha-Al2O3 at 5.0 GPa/500 degrees C. High pressure suppresses the growth of transformed grains to produce alumina bulks with an average grain size of approximately 52 nm at 600 degrees C. In addition, the Hall-Petch effects combined with the pressure-induced curvilinear grain boundary and Moire fringe-like defects enhance the transparent alumina sample to yield a Vickers hardness of 26.4 GPa (0.5 kgf). However, these microstructures do not enhance the fracture toughness of the transparent alumina ceramics.

引用

页数：6

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