Preparation and Ablation Properties of W/TaC Cermet via in-situ Reaction Sintering Process
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2018年第2期
论文作者：蒋进明 王松 LI Wei CHEN Zhaohui
文章页码：431 - 436
摘 要：An attractive way to prepare W/TaC based cermet at a relatively low temperature was proposed and confirmed experimentally. The thermodynamics calculations indicated that the reaction between WC and Ta2O5 was feasible at as low a temperature as 1 400 ℃. The experimental results showed that W/TaC cermet could be fabricated by in-situ reaction sintering process at 1400 ℃ for 2 h in vacuum. The open porosity and bulk density of the W/TaC cermet were 15.3% and 13.4 g/cm3. Further, the microstructural features revealed that W, TaC, and Ta2WO8 were identified to be the main constituents of the W/TaC cermet. The mass lose rate and linear recession rate of the W/TaC cermet during an oxyacetylene torch test were 0.0048 g/s and 0.0233 mm/s, respectively. The high porosity, the presence of Ta2WO8 phases within W/TaC and evaporation of WO3 on the surface of the composite contributed to the decrease of ablative property when comparing with pure W.
蒋进明1，王松2，LI Wei2，CHEN Zhaohui2
1. Department of Basics,Air Force Engineering University2. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory,National University of Defense Technology
摘 要：An attractive way to prepare W/TaC based cermet at a relatively low temperature was proposed and confirmed experimentally. The thermodynamics calculations indicated that the reaction between WC and Ta2O5 was feasible at as low a temperature as 1 400 ℃. The experimental results showed that W/TaC cermet could be fabricated by in-situ reaction sintering process at 1400 ℃ for 2 h in vacuum. The open porosity and bulk density of the W/TaC cermet were 15.3% and 13.4 g/cm3. Further, the microstructural features revealed that W, TaC, and Ta2WO8 were identified to be the main constituents of the W/TaC cermet. The mass lose rate and linear recession rate of the W/TaC cermet during an oxyacetylene torch test were 0.0048 g/s and 0.0233 mm/s, respectively. The high porosity, the presence of Ta2WO8 phases within W/TaC and evaporation of WO3 on the surface of the composite contributed to the decrease of ablative property when comparing with pure W.
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