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Ablation effects and mechanism of sintered silicon carbide ceramics by an ArF excimer laser
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作者 Xin Guo Jinbin Ding +1 位作者 Yi Zhou and Yu Wang 《Chinese Optics Letters》 SCIE EI CAS CSCD 2018年第9期55-59,共5页
The ablation of sintered silicon carbide ceramics by an ArF excimer laser was studied. Three zones are generated: the ablation zone that presented molten morphology and was composed by the Si and C phase; the condens... The ablation of sintered silicon carbide ceramics by an ArF excimer laser was studied. Three zones are generated: the ablation zone that presented molten morphology and was composed by the Si and C phase; the condensation zone formed by vaporized SiC; and the oxidation zone that showed the characteristics of thermal oxidation. The ablation depth and oxidation range increase linearly with fluence and pulses within 0.5-4 J/cm2, but the normalized ablation efficiency is constant (3.60± 0.60 μm · mm2/J). The theoretical photochemical ablation depth supplies 25% of the total depth at 1 J/cm2 but decreases to 16% at 4 J/cm2. The ablation is dominated by the photothermal effect and conforms to the thermal evaporation mechanism. 展开更多
关键词 SIC Ablation effects and mechanism of sintered silicon carbide ceramics by an ArF excimer laser
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Fabrication of solid-phase-sintered Si C-based composites with short carbon fibers 被引量:1
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作者 Xian-hui Li Qing-zhi Yan +2 位作者 Yong-jun Han Mei-qi Cao Chang-chun Ge 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2014年第11期1141-1145,共5页
Solid-phase-sintered Si C-based composites with short carbon fibers(Csf/SSi C) in concentrations ranging from 0 to 10wt% were prepared by pressureless sintering at 2100°C. The phase composition, microstructure,... Solid-phase-sintered Si C-based composites with short carbon fibers(Csf/SSi C) in concentrations ranging from 0 to 10wt% were prepared by pressureless sintering at 2100°C. The phase composition, microstructure, density, and flexural strength of the composites with different Csf contents were investigated. SEM micrographs showed that the Csf distributed in the SSi C matrix homogeneously with some gaps at the fiber/matrix interfaces. The densities of the composites decreased with increasing Csf content. However, the bending strength first increased and then decreased with increasing Csf content, reaching a maximum value of 390 MPa at a Csf content of 5wt%, which was 60 MPa higher than that of SSi C because of the pull-out strengthening mechanism. Notably, Csf was graphitized and damaged during the sintering process because of the high temperature and reaction with boron derived from the sintering additive B4C; this graphitization degraded the fiber strengthening effect. 展开更多
关键词 fiber-reinforced composites silicon carbide carbon fibers solid phase sintering microstructure
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