Published 1994 | Version v1
Book Metadata-only

Correlation among powder characteristics, microstructural development and fracture toughness of Si3N4

Creators

  • 1. Technische Hochschule Darmstadt, Fachbereich Materialwissenschaft, Fachgebiet Disperse Feststoffe (Germany)
  • 2. Max-Planck-Inst. fuer Metallforschung, Pulvermetallurgisches Lab., Stuttgart (Germany)

Description

Different α-rich Si3N4-Powders and α/β-Si3N4 powder mixtures containing 10 Vol% sintering additives (Y2O3/Al2O3) were sintered at temperatures between 1750 C and 1950 C. The three dimensional particle size-shape distributions were determined by quantitative microstructural analysis and a subsequent stereological calculation. The results reveal that the microstructure development depends upon the β-particle size distribution and the β-Si3N4 nuclei density in the starting powder. Fracture toughness of the sintered materials varies from 6,7 MPa.m1/2 to 10,3 MPa.m1/2. A quantitative relationship among fracture toughness, volume fraction and diameter of the elongated grains with aspect ratios > 4 is discussed. (orig.)

Part of:
Silicon nitride 93

Additional details

Publishing Information

Publisher
Trans Tech Publ.
Imprint Place
Aedermannsdorf (Switzerland)
ISBN
0-87849-668-8
Imprint Title
Silicon nitride 93
Imprint Pagination
782 p.
Journal Volume
89-91
Series
Key Engineering Materials.
Journal Page Range
p. 165-170.
ISSN
1013-9826
CODEN
KEMAEY

Conference

Title
International conference on silicon nitride-based ceramics.
Dates
4-6 Oct 1993.
Place
Stuttgart (Germany).

INIS

Country of Publication
Switzerland
Country of Input or Organization
Switzerland
INIS RN
25057746
Subject category
S36: MATERIALS SCIENCE;
Resource subtype / Literary indicator
Conference
Descriptors DEI
ALUMINIUM OXIDES; FRACTURE PROPERTIES; GRAIN BOUNDARIES; GRAIN SIZE; MICROSTRUCTURE; PARTICLE SIZE; POWDERS; SCANNING ELECTRON MICROSCOPY; SILICON NITRIDES; SINTERED MATERIALS; SINTERING; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 1000-4000 K; YTTRIUM OXIDES
Descriptors DEC
ALUMINIUM COMPOUNDS; CHALCOGENIDES; CRYSTAL STRUCTURE; ELECTRON MICROSCOPY; FABRICATION; MATERIALS; MECHANICAL PROPERTIES; MICROSCOPY; NITRIDES; NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PNICTIDES; SILICON COMPOUNDS; SIZE; TEMPERATURE RANGE; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS

Optional Information