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Effects of AlN on the densification and mechanical properties of pressureless-sintered SiC ceramics.
- Source :
-
Progress in Natural Science . Feb2016, Vol. 26 Issue 1, p90-96. 7p. - Publication Year :
- 2016
-
Abstract
- In the present work, SiC ceramics was fabricated with AlN using B 4 C and C as sintering aids by a solid-state pressureless-sintered method. The effects of AlN contents on the densification, mechanical properties, phase compositions, and microstructure evolutions of as-obtained SiC ceramics were thoroughly investigated. AlN was found to promote further densification of the SiC ceramics due to its evaporation over 1800 °C, transportation, and solidification in the pores resulted from SiC grain coarsening. The highest relative density of 99.65% was achieved for SiC sample with 15.0 wt% AlN by the pressureless-sintered method at 2130 °C for 1 h in Ar atmosphere. Furthermore, the fracture mechanism for SiC ceramics containing AlN tended to transfer from single transgranular fracture mode to both transgranular fracture and intergranular fracture modes when the sample with 30.0 wt% AlN sintered at 1900 °C for 1 h in Ar. Also, SiC ceramics with 30.0 wt% AlN exhibited the highest fracture toughness of 5.23 MPa m 1/2 when sintered at 1900 °C. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10020071
- Volume :
- 26
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Progress in Natural Science
- Publication Type :
- Academic Journal
- Accession number :
- 113826557
- Full Text :
- https://doi.org/10.1016/j.pnsc.2016.01.012