The effect of Al2O3-MgO additives on the microstructure of spark plasma sintered silicon nitride

被引：25

作者：

Lukianova, O. A. ^{[1
]}

Ivanov, O. N. ^{[1
]}

机构：

[1] Belgorod State Natl Res Univ, 85 Pobedy Str, Belgorod 308015, Russia

来源：

CERAMICS INTERNATIONAL | 2018年 / 44卷 / 01期

关键词：

Silicon nitride; Magnesium oxide; Microstructure; Spark plasma sintering; DIELECTRIC-PROPERTIES; MECHANICAL-PROPERTIES; THERMAL-CONDUCTIVITY; CERAMICS; SI3N4; FABRICATION; MGO-AL2O3; MGSIN2; PHASE; DENSE;

D O I：

10.1016/j.ceramint.2017.09.188

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：

It was shown that spark plasma sintered silicon nitride with a high content of Al2O3 and MgO consists of alpha and beta silicon nitride, the main phase being a silicon nitride. The increase in the sintering temperature did not lead to significant changes in the phase composition as occurs in silicon nitride added with Al2O3-Y2O3. It was found that increasing in SPS temperature above 1650 degrees C leads to an insignificant increase in the density. A complex shaped equiaxed grain microstructure was shown in both cases. However, doping with aluminum and yttrium oxides allows obtaining an elongated grain microstructure. The Hall-Petch effect was observed for the micro-hardness of the investigated SPSed silicon nitride. The microhardness of the described ceramics was rather high and more than 1900 HV compared to the pressureless sintered at 1800 degrees C silicon nitride with the microhardness equal to 1511 HV.

引用

页码：390 / 393

页数：4

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