• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ceramic Engineering and Science Proceedings >THE EFFECTS OF β-Si_3N_4 SEEDING AND α-Si_3N_4 POWDER SIZE ON THE DEVELOPMENT OF POROUS β-Si_3N_4 CERAMICS
【24h】

THE EFFECTS OF β-Si_3N_4 SEEDING AND α-Si_3N_4 POWDER SIZE ON THE DEVELOPMENT OF POROUS β-Si_3N_4 CERAMICS

机译：β-Si_3N_4粉末和α-Si_3N_4粉末尺寸对多孔β-Si_3N_4陶瓷发展的影响

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

Porous silicon nitride (Si_3N_4) ceramics have significant potential in a number of engineering applications due to their potential for favorable mechanical properties, even with moderately high porosities. In the present work two methods of microstructural control were assessed; (i) seeding with β-Si_3N_4 grains and (ii) varying theα-Si_3N_4 starting powder size. The aim of this work was to develop a ceramic with an improved microstructure, resulting in increased strength. The β-Si_3N_4 seed grains were prepared 'in-house' using a simple, moderately low-temperature processing approach. A series of nominally bi-modal (X-Si_3N_4 powder mixtures were also examined, using various ratios of powders with particle sizes of approximately 0.3 and 1.0 μm. It was demonstrated that the β-Si_3N_4 aspect ratio was predominantly influenced by the amount of coarse α-Si_3N_4 powder in the starting mixture, rather than the amount of β-Si_3N_4 seed grains. The highest aspect ratios (up to -12:1) were obtained when using 100% coarse α-Si_3N_4, as the a- to β-Si_3N_4 transformation period is prolonged, The strength was also slightly increased with a higher coarse α-Si_3N_4 fraction in the starting mixture. In this instance, seeding was shown to provide a small benefit, with the highest strengths (up to ～350 MPa) observed for samples prepared with 0 5 and 1 wt.% β-Si_3N_4 seed crystals.
机译：氮化硅（Si_3N_4）多孔陶瓷由于具有良好的机械性能（即使具有适度的高孔隙率）的潜力，因此在许多工程应用中也具有巨大的潜力。在目前的工作中，评估了两种微结构控制方法; （i）植入β-Si_3N_4晶粒，以及（ii）改变α-Si_3N_4起始粉末的大小。这项工作的目的是开发一种具有改善的微观结构，从而提高强度的陶瓷。 β-Si_3N_4籽粒使用简单，适度的低温加工方法“内部”制备。还检查了一系列标称双峰（X-Si_3N_4粉末混合物），使用各种比例的粒径分别为0.3和1.0μm的粉末。证明了β-Si_3N_4长径比主要受粗颗粒量的影响初始混合物中使用的是α-Si_3N_4粉末，而不是β-Si_3N_4籽粒的数量，当使用100％粗α-Si_3N_4作为α-至β-时，可获得最大的纵横比（最高-12：1）。 Si_3N_4的转变期延长，初始混合物中较高的粗α-Si_3N_4分数也使强度略有增加，在这种情况下，显示出晶种提供的好处很小，观察到的强度最高（最高〜350 MPa）。对于使用0 5和1 wt。％β-Si_3N_4籽晶制备的样品。

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