...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Refractory Metals & Hard Materials >Development of B_4C-HfB_2 composites by reaction hot pressing
【24h】

Development of B_4C-HfB_2 composites by reaction hot pressing

机译：反应热压制备B_4C-HfB_2复合材料

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This paper reports on the development of HfB_2 reinforced B-4C composite prepared through reaction hot pressing of B_4C and HfO_2. These composites were characterized for phase composition, microstructure, mechanical and physical properties. Full dense composites were obtained by hot pressing at 1900 °C and a pressure of 40 MPa. HfB_2 phase was identified as a reaction product in the composites by XRD analysis. Hardness of all the composites was measured to be in the range of 28-35 GPa. High elastic modulus (525 GPa) and shear modulus (196 GPa) were measured for composite corresponding to 10wt% HfO_2. Fractography of the composites indicates transgranular mode of fracture. Fracture toughness of the composites was in the range of 4-7 MPa.m~(1/2) which is higher than that of monolithic B_4C (2.43 MPa.m~(1/2)). Microstructural observation of crack propagation patterns indicates the major toughening mechanism as crack deflection, crack arrest and crack bridging.
机译：本文报道了通过B_4C与HfO_2的反应热压制备的HfB_2增强B-4C复合材料的发展。对这些复合材料的相组成，微观结构，机械和物理性能进行了表征。通过在1900°C和40 MPa的压力下热压获得完全致密的复合材料。通过XRD分析鉴定出HfB_2相为复合物中的反应产物。测量所有复合材料的硬度在28-35 GPa的范围内。测量了对应于10wt％HfO_2的复合材料的高弹性模量（525 GPa）和剪切模量（196 GPa）。复合材料的分形术表明穿晶断裂模式。复合材料的断裂韧性在4-7 MPa.m〜（1/2）的范围内，高于整体式B_4C的断裂韧性（2.43 MPa.m〜（1/2））。裂纹扩展模式的显微组织观察表明，主要的增韧机理为裂纹挠曲，裂纹停止和裂纹桥接。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号