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Hot-Isostatic Pressing of Silicon Carbide Based Multiphase Composed Materials

Published online by Cambridge University Press:  15 February 2011

Dongliang Jiang  and
Jihong She
Dongliang Jiang
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Science, 1295 Ding-Xi Road, Shanghai 200050, Peoples Republic of China
Jihong She
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Science, 1295 Ding-Xi Road, Shanghai 200050, Peoples Republic of China
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Abstract

Silicon carbide (SiC) based ceramic composites with improved fracture toughness and increased flexure strength have been developed by incorporating some other non-oxide and oxide particles or some whiskers and fibres. Hot-Isostatic Pressing (HIP) has been identified as an important technology for strengthening carbide by surface modification. In this paper, Hot-pressed SiC-TiC with different densities and HIP-SiC/SiC(w) composites were post HIPped under a N2-pressure of 200MPa at 1850°C for lh. The results showed that the open pores were closed and physical and mechanical properties such as density, flexure strength and toughness were obviously improved. For the SiC-TiC composites, the final density can be reached above 98% theoretical density, flexure strength and fracture toughness were increased by 100% and 30-50%, respectively. For the SiC/5vol%-SiC(w) composites, the final flexure strength and fracture toughness were increased from 595 MPa and 6.7 MPa m1/2 to 920MPa and 8.5 MPa m1/2 separately. A possible reaction-HIP densification mechanism for SiC ceramics with open pores is proposed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 365: Symposium M – Ceramic Matrix Composites–Advanced High-Temperature Structural Materials , 1994 , 159
Copyright
Copyright © Materials Research Society 1995

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