Effect of atmosphere and sintering time on the microstructure and mechanical properties at high temperatures of $α$-SiC sintered with liquid phase Y$_2$O$_3$ and Al$_2$O$_3$
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arXiv
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| Natura: | Preprint |
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2024
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| author | Rodriguez, Miguel Castillo Bernabe, Antonio Munoz Rodriguez, Arturo Dominguez |
| author_facet | Rodriguez, Miguel Castillo Bernabe, Antonio Munoz Rodriguez, Arturo Dominguez |
| contents | The influence that the atmosphere (N_2 or Ar) and sintering time have on microstructure evolution in liquid-phase-sintered alpha-sic and on its mechanical properties at high temperature was investigated. The microstructure of the samples sintered in N2 was equiaxed with a grain size of 0.70 μm and a density of 98% of the theoretical value regardless of the sintering time. In contrast, samples sintered in Ar had an elongated-grain microstructure with a density decreasing from 99% to 95% and a grain size increasing from 0.64 to 1.61 μm as the sintering time increased from 1 to 7 hours. The mechanical behaviour at 1450 °C showed the samples sintered in nitrogen to be brittle and fail at very low strains, with a fracture stress increasing from 400 to 800 MPa as the sintering time increased. In contrast, the samples sintered in Ar were quasi-ductile with increasing strain to failure as the sintering time increased, and a fracture stress strongly linked to the form and size of the grains. These differences in the mechanical properties of the two materials are discussed in the text. During mechanical tests, a loss of intergranular phase takes place in a region, between 50 and 150 μm thick, close to the surface of the samples--the effect being more important in the samples sintered in Ar |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_02436 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Effect of atmosphere and sintering time on the microstructure and mechanical properties at high temperatures of $α$-SiC sintered with liquid phase Y$_2$O$_3$ and Al$_2$O$_3$ Rodriguez, Miguel Castillo Bernabe, Antonio Munoz Rodriguez, Arturo Dominguez Applied Physics The influence that the atmosphere (N_2 or Ar) and sintering time have on microstructure evolution in liquid-phase-sintered alpha-sic and on its mechanical properties at high temperature was investigated. The microstructure of the samples sintered in N2 was equiaxed with a grain size of 0.70 μm and a density of 98% of the theoretical value regardless of the sintering time. In contrast, samples sintered in Ar had an elongated-grain microstructure with a density decreasing from 99% to 95% and a grain size increasing from 0.64 to 1.61 μm as the sintering time increased from 1 to 7 hours. The mechanical behaviour at 1450 °C showed the samples sintered in nitrogen to be brittle and fail at very low strains, with a fracture stress increasing from 400 to 800 MPa as the sintering time increased. In contrast, the samples sintered in Ar were quasi-ductile with increasing strain to failure as the sintering time increased, and a fracture stress strongly linked to the form and size of the grains. These differences in the mechanical properties of the two materials are discussed in the text. During mechanical tests, a loss of intergranular phase takes place in a region, between 50 and 150 μm thick, close to the surface of the samples--the effect being more important in the samples sintered in Ar |
| title | Effect of atmosphere and sintering time on the microstructure and mechanical properties at high temperatures of $α$-SiC sintered with liquid phase Y$_2$O$_3$ and Al$_2$O$_3$ |
| topic | Applied Physics |
| url | https://arxiv.org/abs/2402.02436 |