• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Al_2O_3-Tic-ZrO_2 nanocomposites fabricated by combustion synthesis followed by hot pressing
【24h】

Al_2O_3-Tic-ZrO_2 nanocomposites fabricated by combustion synthesis followed by hot pressing

机译：燃烧合成然后热压制备的Al_2O_3-Tic-ZrO_2纳米复合材料

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

Al_2O_3-TiC-ZrO_2 nanocomposites were prepared by combustion synthesis followed by hot pressing with TiO_2, Al, C and ZrO_2 as raw materials. Combustion synthesis is favorable to obtain in situ formed powder with TiC and ZrO_2 nanoparticles distributed in Al_2O_3 matrix. The effects of varying amount of ZrO_2 nano-scale additives on the mechanical properties and microstructure of Al_2O_3-TiC composite were studied. An appropriate amount of ZrO_2 nanoparticle additive improves the mechanical properties. The flexural strength and fracture toughness of Al_2O_3-TiC-10 wt.% ZrO_2 composite were approximately 20% higher than that of Al_2O_3-TiC composite. The addition of ZrO_2 nanoparticles reduced the grain size and improved the distribution of different phases. With the ZrO_2 addition, the fracture mode changes from intergranular to mixed inter/transgranular fracture. The residual stresses are generated by the thermal expansion coefficient mismatch between different phases, which leads to the generation of dislocations and microcracks around the nanoparticles. The effects of nanoparticles on the deflected propagation, nailing and blocking of the dislocation and microcracks are believed to contribute to the improvement of the strength and toughness of Al_2O_3-TiC-ZrO_2 composite.
机译：通过燃烧合成，然后以TiO_2，Al，C和ZrO_2为原料热压制备Al_2O_3-TiC-ZrO_2纳米复合材料。燃烧合成有利于获得TiC和ZrO_2纳米颗粒分布在Al_2O_3基体中的原位形成粉末。研究了不同含量的ZrO_2纳米级添加剂对Al_2O_3-TiC复合材料力学性能和微观结构的影响。适量的ZrO_2纳米颗粒添加剂可改善机械性能。 Al_2O_3-TiC-10 wt。％ZrO_2复合材料的抗弯强度和断裂韧性比Al_2O_3-TiC复合材料高约20％。 ZrO_2纳米粒子的添加减小了晶粒尺寸并改善了不同相的分布。随着ZrO_2的加入，断裂模式从晶间断裂变为混合/跨晶间断裂。残余应力是由于不同相之间的热膨胀系数不匹配而产生的，从而导致在纳米粒子周围产生位错和微裂纹。据信纳米粒子对位错和微裂纹的偏斜传播，钉扎和阻塞的影响有助于改善Al_2O_3-TiC-ZrO_2复合材料的强度和韧性。

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