MICROSTRUCTURAL DEVELOPMENT DURING GAS-PRESSURE SINTERING OF ALPHA-SILICON NITRIDE

被引：192

作者：

MITOMO, M ^{[1
]}

UENOSONO, S ^{[1
]}

机构：

[1] KAWASAKI STEEL CHEM IND CO LTD,HIGH TECHNOL RES INST,CHIBA 260,JAPAN

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1992年 / 75卷 / 01期

关键词：

SILICON NITRIDE; SINTERING; GRAIN GROWTH; FRACTURE TOUGHNESS; PHASE TRANSITIONS;

D O I：

10.1111/j.1151-2916.1992.tb05449.x

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：

Gas-pressure sintering of alpha-Si3N4 was carried out at 1850-degrees to 2000-degrees-C in 980-kPa N2. The diameters and aspect ratios of hexagonal grains in the sintered materials were measured on polished and etched surfaces. The materials have a bimodal distribution of grain diameters. The average aspect ratio in the materials from alpha-Si3N4 powder was similar to that in the materials from beta-Si3N4 powder. The aspect ratio of large and elongated grains was larger than that of the average for all grains. The development of elongated grains was related to the formation of large nuclei during the alpha-to-beta phase transformation. The fracture toughness of gas-pressure-sintered materials was not related to the alpha-content in the starting powder or the aspect ratio of the grains, but to the diameter of the large grains. Crack bridging was the main toughening mechanism in gas-pressure-sintered Si3N4 ceramics.

引用

页码：103 / 108

页数：6

共 31 条

[1] TOUGHENING BEHAVIOR IN WHISKER-REINFORCED CERAMIC MATRIX COMPOSITES [J].

BECHER, PF ;

HSUEH, CH ;

ANGELINI, P ;

TIEGS, TN .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1988, 71 (12) :1050-1061

[2] MICROSTRUCTURAL DESIGN OF TOUGHENED CERAMICS [J].

BECHER, PF .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1991, 74 (02) :255-269

[3] HOT-PRESSING AND ALPHA-BETA PHASE-TRANSFORMATION IN SILICON-NITRIDE [J].

BOWEN, LJ ;

WESTON, RJ ;

CARRUTHERS, TG ;

BROOK, RJ .

JOURNAL OF MATERIALS SCIENCE, 1978, 13 (02) :341-350

[4] INTERFACE DEBONDING AND FIBER CRACKING IN BRITTLE MATRIX COMPOSITES [J].

EVANS, AG ;

HE, MY ;

HUTCHINSON, JW .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1989, 72 (12) :2300-2303

[5] CRACK DEFLECTION PROCESSES .1. THEORY [J].

FABER, KT ;

EVANS, AG .

ACTA METALLURGICA, 1983, 31 (04) :565-576

[6] CRACK DEFLECTION PROCESSES .2. EXPERIMENT [J].

FABER, KT ;

EVANS, AG .

ACTA METALLURGICA, 1983, 31 (04) :577-584

[7]

German, 2019, LIQUID PHASE SINTERI, V5, P127

[8]

HAMPSHIRE S, SPECIAL CERAMICS, V7, P37

[9] THE PRESSURE-DEPENDENCE OF MICROSTRUCTURE AND MECHANICAL-PROPERTIES OF HOT ISOSTATICALLY PRESSED SI3N4 [J].

HEINRICH, J ;

HENN, N ;

BOHMER, M .

MATERIALS SCIENCE AND ENGINEERING, 1985, 71 (1-2) :131-136

[10] CONTROL OF LIQUID-PHASE-ENHANCED DISCONTINUOUS GRAIN-GROWTH IN BARIUM-TITANATE [J].

HENNINGS, DFK ;

JANSSEN, R ;

REYNEN, PJL .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1987, 70 (01) :23-27

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