摘要
凝固是制备材料很基本的成型技术之一,但超重力凝固时,高转速产生的离心力克服合金熔体在坩埚孔隙处产生的表面张力,极易在超重力凝固过程中发生熔体渗漏或坩埚破碎,导致实验失败。本工作采用热压烧结工艺制备ZrO_(2)/h-BN和AlN/h-BN复合陶瓷,测试其物理和力学性能,择优选材加工成坩埚。结果表明,AlN/h-BN的热导率优于ZrO_(2)/h-BN,其高温压缩强度明显高于ZrO_(2)/h-BN。基于超重力凝固时坩埚损伤的力学分析,选用低密度、高热导率、高压缩强度的AlN/h-BN制备坩埚,通过50炉超重力凝固实验,验证其性能满足超重力凝固的需要。
Solidification is one of the most basic forming technologies for preparingfor materials.However,during the hypergravity solidification,the centrifugal force during the high-speed rotation can be capable to overcome the surface tension generated by the alloy melt exiting the pores of the crucible,which will easily cause the melt to leak out of the crucible,finally leading to the failure of the experiment.In this study,ZrO_(2)/h-BN and AlN/h-BN multiphase ceramics were prepared by hot-pressing sintering process and their physical and mechanical properties were tested.The results show that the thermal conductivity of AlN/h-BN are better than that of ZrO_(2)/h-BN,and the high temperature compressive strength of AlN/h-BN is also significantly higher than that of ZrO_(2)/h-BN.Based on the mechanical analysis of the damage of the crucible during the hypergravity solidification,AlN/h-BN with low density,high thermal conductivity and high compressive strength was selected to prepare for the crucible.The performance of the crucible was verified through 50 furnace experiments,confirming its suitability for hypergravity solidification.
作者
赵建江
陈云敏
韦华
ZHAO Jianjiang;CHEN Yunmin;WEI Hua(Center for Hypergravity Experimental and Interdisciplinary Research,Zhejiang University,Hangzhou 310058,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第21期107-112,共6页
Materials Reports
基金
国家自然科学基金基础科学中心项目(51988101)。
