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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of temperature and heating rate on the sintering performance of SiC-Al2O3-Dy2O3 and SiC-Al2O3-Yb2O3 systems

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Author(s):
Ribeiro, S. [1] ; Genova, L. A. [2] ; Ribeiro, G. C. [1] ; Oliveira, M. R. [1] ; Bressiani, A. H. A. [2]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Lorena Sch Engn EEL, Dept Mat Engn DEMAR, Estr Santa Lucretia S-N, CP 116, BR-12600970 Lorena, SP - Brazil
[2] Nucl Energy Res Inst IPEN, Sao Paulo, SP - Brazil
Total Affiliations: 2
Document type: Review article
Source: CERAMICS INTERNATIONAL; v. 43, n. 18, p. 16048-16054, DEC 15 2017.
Web of Science Citations: 3
Abstract

Samples of SiC + 10 vol%(Al2O3 + Dy2O3) and SiC + 10 vol%(Al2O3 + Yb2O3) mixtures were obtained by cold isostatic pressing and sintered for one hour in a dilatometer at 1800 degrees C and 1900 degrees C, applying heating rates of 10, 20 and 30 degrees C/min. The results of the complete sintering cycle indicated that the heating rates do not significantly influence the shrinkage, but that temperature and total sintering time may be relevant factors. The compacts sintered at 1900 degrees C shrank on average 9% more than those sintered at 1800 degrees C, and it was found that the sintering time can be reduced by 40-50% at faster heating rates. The maximum shrinkage rates occurred at temperatures lower than those of the sintering thresholds for the two mixtures, two temperatures and three heating rates. It was also found that after formation of the liquid, the mechanisms of particle rearrangement and solution-precipitation were not as fast as reported in the literature, even at high heating rates, for example 30 degrees C/min, but they are responsible for much of the shrinkage occurring throughout the sintering cycle. (AU)

FAPESP's process: 13/08032-9 - Dilatometric study of the sintering process of SiC doped with Al2O3-Yb2O3 or Al2O3-Dy2O3 oxide systems
Grantee:Sebastião Ribeiro
Support Opportunities: Regular Research Grants
FAPESP's process: 10/51925-6 - Implementation of the SEVNB method to measure the fracture toughness of liquid phase sintered SiC ceramics using Al2O3-Yb2O3 or Al2O3-Nd2O3 as additives
Grantee:Sebastião Ribeiro
Support Opportunities: Regular Research Grants