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

In situ preparation of alpha-SiAlON-SiC composite

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Author(s):
C. Santos [1] ; J. V. C. de Souza [2] ; C. A. Kelly [3] ; S. Ribeiro [4] ; O. M. M. Silva [5] ; C. R. M. Silva [6] ; K. Strecker [7]
Total Authors: 7
Affiliation:
[1] FAENQUIL. DEMAR
[2] UNESP. FEG
[3] FAENQUIL. DEMAR
[4] FAENQUIL. DEMAR
[5] Centro Técnico Aeroespacial. Div. Materiais AMR
[6] Centro Técnico Aeroespacial. Div. Materiais AMR
[7] FAENQUIL. DEMAR
Total Affiliations: 7
Document type: Journal article
Source: Cerâmica; v. 51, n. 320, p. 413-419, 2005-12-00.
Abstract

The objective of this work is to obtain in situ alpha-SiAlON-SiC composites, by silicon nitride solid solution development, during sintering, using rare earth and yttrium oxide mixture (CRE3O3) as stabilizer of the alpha-Si3N4 phase. A fraction of 20 vol.% of AlN-CRE2O3 mixture was mixed to 80 vol.% of Si3N4. Different contents of beta-SiC powders were mixed to the Si3N4-AlN-CRE2O3 powder mixture. The powder mixtures were milled and compacted by uniaxial and cold isostatic pressing. The green bodies were sintered at 1950 °C during 1 h under 1 MPa of N2 pressure. The sintered samples were characterized by X-ray diffraction and scanning electron microscopy, in order to assess the crystalline phases and microstructural aspects, respectively. The results revealed the presence of alpha-SiAlON and beta-SiC as the only crystalline phases present in the material. No partial crystallization of remaining intergranular phase was detected. No alpha-SiAlON solubility variation was observed by the use of different SiC contents, but different grain of a' grains are related to SiC addition in the mixtures. (AU)