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首页> 外文期刊>CERAMICS INTERNATIONAL >Effect of pressure and temperature on densification, microstructure and mechanical properties of spark plasma sintered silicon carbide processed with beta-silicon carbide nanopowder and sintering additives
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Effect of pressure and temperature on densification, microstructure and mechanical properties of spark plasma sintered silicon carbide processed with beta-silicon carbide nanopowder and sintering additives

机译：压力和温度对β-碳化硅纳米粉和烧结助剂处理的火花等离子体烧结碳化硅的致密化，微观结构和力学性能的影响

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摘要

The effects of applied pressure and temperature during spark plasma sintering (SPS) of additive-containing nanocrystalline silicon carbide on its densification, microstructure, and mechanical properties have been investigated. Both relative density and grain size are found to increase with temperature. Furthermore, with increase in pressure at constant temperature, the relative density improves significantly, whereas the grain size decreases. Reasonably high relative density (similar to 96%) is achieved on carrying out SPS at 1300 degrees C under applied pressure of 75 MPa for 5 min, with a maximum of similar to 97.7% at 1500 degrees C under 50 MPa for 5 min. TEM studies have shown the presence of an amorphous phase at grain boundaries and triple points, which confirms the formation of liquid phase during sintering and its significant contribution to densification of SiC at relatively lower temperatures (<= 1400 degrees C). The relative density decreases on raising the SPS temperature beyond 1500 degrees C, probably due to pores caused by vaporization of the liquid phase. Whereas beta-SiC is observed in the microstructures for SPS carried out at temperatures <= 1500 degrees C, alpha-SiC evolves and its volume fraction increases with further increase in SPS temperatures. Both hardness and Young's modulus increase with increase in relative density, whereas indentation fracture toughness appears to be higher in case of two-phase microstructure containing alpha and beta-SiC. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
机译：研究了含添加剂的纳米晶碳化硅的火花等离子体烧结（SPS）过程中施加的压力和温度对其致密性，微观结构和力学性能的影响。发现相对密度和晶粒尺寸均随温度增加。此外，随着恒温下压力的增加，相对密度显着提高，而晶粒尺寸减小。在1300℃，75 MPa的施加压力下进行5分钟的SPS可获得合理的较高相对密度（接近96％），最大值在1500℃下50 MPa的条件下进行5分钟达到97.7％的最大值。 TEM研究表明，在晶界和三相点处存在无定形相，这证实了烧结过程中液相的形成及其在相对较低的温度（<= 1400℃）下对SiC致密化的显着贡献。将SPS温度提高到1500摄氏度以上时，相对密度会降低，这可能是由于液相汽化导致的孔隙。尽管在<= 1500摄氏度的温度下进行SPS的微观结构中观察到了β-SiC，但随着SPS温度的进一步升高，α-SiC逐渐析出并且其体积分数增加。硬度和杨氏模量都随相对密度的增加而增加，而在包含α和β-SiC的两相微结构的情况下，压痕断裂韧性似乎更高。 （C）2015 Elsevier Ltd和Techna Group S.r.l.版权所有。

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