Effect of starting phase on microstructure and fracture toughness of hot-pressed silicon carbide

Jong Kook Lee; Jong Gon Park; Eun Gu Lee; Dong Seok Seo; Yeon Hwang

doi:10.1016/S0167-577X(02)00765-6

Effect of starting phase on microstructure and fracture toughness of hot-pressed silicon carbide

Jong Kook Lee, Jong Gon Park, Eun Gu Lee, Dong Seok Seo, Yeon Hwang

Dept. of Materials Science & Engineering

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

The effect of starting phase of raw material on the microstructure and the fracture toughness of silicon carbide was investigated. The starting phase was adjusted by varying the mixed ratio of α-SiC and β-SiC powders, and they were hot pressed with sintering aids. From the microstructure, some elongated grains were found among equiaxial grains. The anisotropic grain growth was resulted from phase transformation of the β-SiC to the α-SiC with 4H polytype during sintering or heat treatment. Volume fraction, maximum length, and aspect ratio of elongated grains were the highest at 50 vol.% β-SiC in the starting SiC powder, which showed the highest fracture toughness about 6.0 MPa m 1/2.

Original language	English
Pages (from-to)	203-208
Number of pages	6
Journal	Materials Letters
Volume	57
Issue number	1
DOIs	https://doi.org/10.1016/S0167-577X(02)00765-6
State	Published - Nov 2002

Keywords

4H polytype
Elongated grain growth
Fracture toughness
Hot-pressing
Phase transformation
Rod-like type
Silicon carbide

Access to Document

10.1016/S0167-577X(02)00765-6

Cite this

@article{cd3909d9e0ee4ea0869851732fee0642,

title = "Effect of starting phase on microstructure and fracture toughness of hot-pressed silicon carbide",

abstract = "The effect of starting phase of raw material on the microstructure and the fracture toughness of silicon carbide was investigated. The starting phase was adjusted by varying the mixed ratio of α-SiC and β-SiC powders, and they were hot pressed with sintering aids. From the microstructure, some elongated grains were found among equiaxial grains. The anisotropic grain growth was resulted from phase transformation of the β-SiC to the α-SiC with 4H polytype during sintering or heat treatment. Volume fraction, maximum length, and aspect ratio of elongated grains were the highest at 50 vol.\% β-SiC in the starting SiC powder, which showed the highest fracture toughness about 6.0 MPa m 1/2.",

keywords = "4H polytype, Elongated grain growth, Fracture toughness, Hot-pressing, Phase transformation, Rod-like type, Silicon carbide",

author = "Lee, \{Jong Kook\} and Park, \{Jong Gon\} and Lee, \{Eun Gu\} and Seo, \{Dong Seok\} and Yeon Hwang",

year = "2002",

month = nov,

doi = "10.1016/S0167-577X(02)00765-6",

language = "English",

volume = "57",

pages = "203--208",

journal = "Materials Letters",

issn = "0167-577X",

number = "1",

}

TY - JOUR

T1 - Effect of starting phase on microstructure and fracture toughness of hot-pressed silicon carbide

AU - Lee, Jong Kook

AU - Park, Jong Gon

AU - Lee, Eun Gu

AU - Seo, Dong Seok

AU - Hwang, Yeon

PY - 2002/11

Y1 - 2002/11

N2 - The effect of starting phase of raw material on the microstructure and the fracture toughness of silicon carbide was investigated. The starting phase was adjusted by varying the mixed ratio of α-SiC and β-SiC powders, and they were hot pressed with sintering aids. From the microstructure, some elongated grains were found among equiaxial grains. The anisotropic grain growth was resulted from phase transformation of the β-SiC to the α-SiC with 4H polytype during sintering or heat treatment. Volume fraction, maximum length, and aspect ratio of elongated grains were the highest at 50 vol.% β-SiC in the starting SiC powder, which showed the highest fracture toughness about 6.0 MPa m 1/2.

AB - The effect of starting phase of raw material on the microstructure and the fracture toughness of silicon carbide was investigated. The starting phase was adjusted by varying the mixed ratio of α-SiC and β-SiC powders, and they were hot pressed with sintering aids. From the microstructure, some elongated grains were found among equiaxial grains. The anisotropic grain growth was resulted from phase transformation of the β-SiC to the α-SiC with 4H polytype during sintering or heat treatment. Volume fraction, maximum length, and aspect ratio of elongated grains were the highest at 50 vol.% β-SiC in the starting SiC powder, which showed the highest fracture toughness about 6.0 MPa m 1/2.

KW - 4H polytype

KW - Elongated grain growth

KW - Fracture toughness

KW - Hot-pressing

KW - Phase transformation

KW - Rod-like type

KW - Silicon carbide

UR - http://www.scopus.com/inward/record.url?scp=0036850906&partnerID=8YFLogxK

U2 - 10.1016/S0167-577X(02)00765-6

DO - 10.1016/S0167-577X(02)00765-6

M3 - Article

AN - SCOPUS:0036850906

SN - 0167-577X

VL - 57

SP - 203

EP - 208

JO - Materials Letters

JF - Materials Letters

IS - 1

ER -

Effect of starting phase on microstructure and fracture toughness of hot-pressed silicon carbide

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this