Properties of cubic Si3N4 obtained by shock synthesis

被引：2

作者：

Blank, V. D. ^{[1
]}

Deribas, A. A. ^{[2
]}

Lvova, N. A. ^{[1
]}

Bagramov, R. H. ^{[1
]}

Kulnitskiy, B. A. ^{[1
]}

Perezhogin, I. A. ^{[1
]}

Prokhorov, V. M. ^{[1
]}

Silvestrov, V. V. ^{[2
]}

Yunoschev, A. S. ^{[2
]}

机构：

[1] Technol Inst Superhard & Novel Carbon Mat, Centralnaya St, Troitsk 142190, Russia

[2] Lavrentyev Inst Hydrodynam SB RAS, Novosibirsk 630090, Russia

来源：

EXPLOSION, SHOCK WAVE AND HYPERVELOCITY PHENOMENA IN MATERIALS II | 2008年 / 566卷

关键词：

nitrides; high-pressure high temperature (HTHP); mechanical properties; thermal properties;

D O I：

10.4028/www.scientific.net/MSF.566.129

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The cubic gamma-Si3N4 phase was synthesized by the shock technique from the hexagonal beta-Si3N4 phase. The thermal stability of the gamma-Si3N4 was investigated during heating in vacuum up to 1773K. An exothermal heat effect was found at 1690K and structural investigations revealed complete transformation of gamma-Si3N4 to beta-Si3N4. Corresponding heat effect value was estimated as 51.3 +/- 7.7 KJ/mol. The high-pressure-high-temperature treatment (P = 13 GPa, T = 1300-2300 K) was applied to gamma-Si3N4 to make bulk polycrystalline non-porous samples. It was found that temperatures below 1623 K do not change content of the cubic gamma-Si3N4 while temperatures above 2273 K decrease it substantially. Mechanical properties of these bulk samples were measured by acoustic wave and nanoindentation techniques. The maximum values belong to cubic gamma-Si3N4: hardness 39-44 GPa, Young's modulus 475 Gpa and bulk modulus 263 GPa. Equilibrium gamma-beta line position in P-T phase diagram was estimated by using data obtained in this work. The equilibrium pressure at T = 300 K was estimated as P-300 = 7.0 +/- 2.0 GPa.

引用

页码：129 / +

页数：2

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