Superhard single-phase (Ti,Cr)B2 ceramics

被引：15

作者：

Feng, Lun ^{[1
]}

Fahrenholtz, William G. ^{[1
]}

Hilmas, Gregory E. ^{[1
]}

Silvestroni, Laura ^{[2
]}

机构：

[1] Missouri Univ Sci & Technol, Dept Mat Sci & Engn, Rolla, MO 65049 USA

[2] Natl Res Council Italy, CNR ISTEC, Inst Sci & Technol Ceram, Faenza, Italy

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2022年 / 105卷 / 08期

关键词：

chromium diborides; superhard materials; titanium diborides; Vickers hardness; MECHANICAL-PROPERTIES; OXIDATION RESISTANCE; TEMPERATURE; DIBORIDE;

D O I：

10.1111/jace.18490

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：

A nominally pure and dense (Ti0.9Cr0.1)B-2 ceramic was produced by spark plasma sintering of powders synthesized by boro/carbothermal reduction of oxides. The synthesized powders were a single phase and had an average particle of 0.4 +/- 0.1 mu m and an oxygen content of 1.2 wt%. Average Vickers hardness values of the resulting ceramics increased from 25.9 +/- 0.8 GPa at a load of 9.81 N, to 46.3 +/- 0.8 GPa at a load of 0.49 N. Compared to the nominally pure TiB2 ceramic obtained under the same processing conditions, the (Ti0.9Cr0.1)B-2 ceramic had higher values under the same load due to the finer average grain size (2.4 +/- 1.0 mu m), higher relative density, and solid solution hardening. The results indicated that the Cr addition promoted densification, suppressed grain growth, and improved the hardness of TiB2 ceramics. This is the first report for dense and single-phase (Ti,Cr)B-2 ceramics as superhard materials.

引用

页码：5032 / 5038

页数：7

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