高致密ZrB_(2)-ZrC复合材料的高压制备及热烧蚀性能  

High Pressure Preparation and Characterization of High Density ZrB_(2)-ZrC Ultra-High Temperature Ceramic

作　　者：杨境 赵昊 丁战辉[1,2] 陈可夫 徐保银 李苗 杜晓波 李永峰[1] 姚斌[1] YANG Jing;ZHAO Hao;DING Zhanhui;CHEN Kefu;XU Baoyin;LI Miao;DU Xiaobo;LI Yongfeng;YAO Bin(College of Physics,Jilin University,Changchun 130012,Jilin,China;National Key Laboratory of Science and Technology on High-Strength Structural Materials,Central South University,Changsha 410083,Hunan,China;College of Physics,Changchun Normal University,Changchun 130032,Jilin,China)

机构地区：[1]吉林大学物理学院,吉林长春130012 [2]中南大学轻质高强结构材料重点实验室,湖南长沙410083 [3]长春师范大学物理学院,吉林长春130032

出　　处：《高压物理学报》2022年第4期24-32,共9页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(11074093);中南大学轻质高强结构材料重点实验室基金(6142912200201)。

摘　　要：超高温陶瓷具有高熔点、高热导率、抗氧化烧蚀等优异性能,是可重复使用的高超声速飞行器防热部件的重要候选材料之一。利用高压技术制备出了高致密超高温陶瓷ZrB_(2)-ZrC复合材料。通过调控合成条件和原料配比,研究了合成压力和烧结助剂ZrC对复合材料抗热烧蚀性能的影响规律。结果表明:在压力3.2 GPa、温度950℃的条件下制备出的ZrB_(2)-ZrC复合材料的致密度达到95%以上,该复合材料在1600℃烧蚀下的最优质量烧蚀率为17μg/s,在2000℃下的最优质量烧蚀率为30μg/s;在合成压力为2.9 GPa、温度为950℃的条件下,改变烧结助剂ZrC的含量可以影响复合材料的热烧蚀性能。其中,当ZrB_(2)与ZrC的摩尔比为8∶1时,制备的ZrB_(2)-ZrC复合材料经1600℃烧蚀后的质量烧蚀率达到最低值(35μg/s)。Ultra-high temperature ceramics have excellent properties,such as high melting point,high thermal conductivity,and anti-oxidative ablation,and thus are important candidates for reusable heatresistant parts of hypersonic aircraft.In this paper,high-density and ultra-high temperature ceramic ZrB_(2)-ZrC composites were prepared by high pressure technology.By adjusting the synthesis conditions and the ratio of raw materials,the effects of synthesis pressure and sintering aid ZrC content on the thermal ablation properties of the composites were studied.The results show that the density of ZrB_(2)-ZrC composite prepared under 3.2 GPa and 950℃is above 95%,and the optimal mass ablation rate of the composite at 1600℃is 17μg/s.The optimal mass ablation rate at 2000℃is 30μg/s.Under the synthesis pressure of 2.9 GPa and temperature of 950℃,by changing the content of the sintering aid ZrC,the thermal ablation performance of the composites could be affected.When the molar ratio of ZrB_(2)to ZrC is 8∶1,the mass ablation rate of the ZrB_(2)-ZrC composites after ablation at 1600℃has the lowest value(35μg/s).

关 键 词：超高温陶瓷 ZrB_(2) ZRC 复合材料 高压合成 热烧蚀性能 

分 类 号：O521.2[理学—高压高温物理]