ZrB_2-SiCw超高温陶瓷爆炸压实工艺研究  

Study on Explosive Compaction Process of ZrB_2-SiCw Ultrahigh Temperature Ceramics

作　　者：李金平[1] 孟松鹤[1] 韩杰才[1] 张幸红[1] 

机构地区：[1]哈尔滨工业大学复合材料研究所,黑龙江哈尔滨150001

出　　处：《稀有金属材料与工程》2006年第A02期177-180,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(90205034);国家博士后科学基金(2005037179)项目资助

摘　　要：为了改善ZrB2-SiC材料的韧性,采用混料-爆炸压实工艺制备SiC晶须增韧ZrB2复合材料,并研究其密度与组织。结果表明,采用该工艺可制备95．25％TD的ZrB2-SiCw复合材料;炸药选择直接影响爆炸坯的密度;对单种炸药,爆轰压力与爆炸坯密度随着装药量的增加而增加;对混合炸药,随着黑索今质量的增加,爆轰压力增加,而爆炸坯密度先增加、后减小,有一个最大值。SiC晶须在爆炸冲击波的作用下被折断成碎片,该材料的组织为碎片状的SiC晶须镶嵌于密堆的ZrB2颗粒间隙中。SiC whisker toughened ZrB2 composites were prepared by mixing-explosive compaction in order to improve the toughness of these materials, and the densities and the microstructure of the ZrB2-SiCw composites were studied. The results showed that ZrB2-SiCw composites with 95.25% of the theory density can be prepared by explosive compaction. The densities of the ZrB2-SiCw were different upon using different explosives. For a single explosive, with the raise of the explosive mass, the explosive pressures and the densities of the composites increased gradually. For the hybrid explosive of the RDX and the Ammonium Nitrate explosive, with the raise of the EDX mass, the explosive pressures increased, and the densities first increased, and then decreased, there was a maximal value. SiC whiskers were broken off under the action of the explosive shock wave, the microstructures of the ZrB2-SiCw composites with the big dense ZrB2 matrix particles beset by the whisker fragments appeared.

关 键 词：超高温陶瓷 ZrB2-SiCw 爆炸压实 密度 组织 

分 类 号：TQ174.1[化学工程—陶瓷工业]