Effect of cubic boron nitride grain size in the reinforcing of α-Sialon ceramics sintered via SPS

被引：26

作者：

Garrett, J. C. ^{[1
]}

Sigalas, I. ^{[1
]}

Wolfrum, A. K. ^{[2
]}

Herrmann, M. ^{[2
]}

机构：

[1] Univ Witwatersrand, Sch Chem & Met Engn, DST NRF Ctr Excellence Strong Mat, ZA-2050 Johannesburg, South Africa

[2] Fraunhofer Inst Ceram Technol & Syst IKTS, Dresden, Germany

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2015年 / 35卷 / 02期

关键词：

Sialon; Cubic boron nitride (cBN); Composites; Hardness; Interfaces; PHASE-TRANSFORMATION; FORMATION BEHAVIOR; MICROSTRUCTURE; COMPOSITES; SIAION;

D O I：

10.1016/j.jeurceramsoc.2014.09.036

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：

Utilising SPS, fully dense alpha-Sialon ceramics were obtained during sintering at temperatures as low as 1550 degrees C. This enabled the full densification alpha-Sialon composites with 10 and 100 mu m cubic boron nitride (cBN) grains. The detailed microstructural analysis of these materials with SEM and Raman spectroscopy revealed different cBN to hexagonal BN (hBN) conversion mechanisms. The smaller cBN grains only show a conversion into hBN on their surface whereas the large grains show not only conversion on the surface but also conversion at the internal grain boundaries between the twins detected inside the cBN grains. The increasing degree of formation of hBN results in decreasing hardness and increasing fracture toughness. Therefore the properties of materials with 100 mu m cBN grains are more sensitive to the sintering temperature. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：451 / 462

页数：12

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