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- Title
Densification and microstructure of Si<sub>3</sub>N<sub>4</sub>-TiN ceramic composites.
- Authors
Ferreira, T. S.; Carvalho, F. M. S.; Guedes-Silva, C. C.
- Abstract
Silicon nitride is a ceramic material widely used in various structural applications at high temperatures owing to its excellent combination of mechanical and thermal properties. To increase the application of Si3N4, many researches have been developed to improve its fracture toughness and processing conditions. In this study, the sintering and microstructure of Si3N4-TiN composites, containing Al2O3 and Y2O3 as sintering aids, were studied. Samples were obtained by the conventional method of mixing powders and sintered at 1750 °C/1 h and 1815 °C/1 h under nitrogen atmosphere. Density values of the samples were determined by the Archimedes method, reaching values between 96.9% and 98.0% of theoretical density, with a porosity of less than 0.5%. The sintered samples were analyzed by X-ray powder diffraction and scanning electron microscopy. The results showed the materials reached high fracture toughness, low hardness and a microstructure with TiN grains dispersed in a β-Si3N4 matrix containing an amorphous intergranular phase.
- Subjects
SILICON nitride; CERAMIC materials; SOIL densification; MICROSTRUCTURE; MECHANICAL behavior of materials
- Publication
Ceramica, 2019, Vol 65, Issue SUPL.1, p87
- ISSN
0366-6913
- Publication type
Article
- DOI
10.1590/0366-6913201965S12605