Influence of machining on the strength of SiC-Al 2 O 3 -Y 2 O 3 ceramic

Dean-Mo LIu*, Chen Tsu Fu, Li Jiaun Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The influence of surface machining on the mechanical strength of SiC ceramics was investigated in terms of surface roughness, residual stress, and surface morphology observation. Experimental results showed that the mechanical strength of the SiC ceramic appears to correlate with the surface roughness of the ceramics: the lower the surface roughness, the higher the flexural strength. An average four-point bending strength of as high as 700 MPa, which is higher by a factor of 1.8 than the ceramic with as-fired surface, can be achieved after the surface of the specimens is polished with a 600-grit fine diamond wheel. More extensive surface polishing deteriorates the strength by forming large surface pores which act as failure origins. Machining-induced compressive residual stress in the thin surface layer of the ceramic appears to increase the fracture stress to only a limited extent.

Original languageEnglish
Pages (from-to)267-270
Number of pages4
JournalCeramics International
Volume22
Issue number3
DOIs
StatePublished - 1 Jan 1996

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