• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International Carbon Conference(Carbon 2007); 20070715-20; Seattle,WA(US) >LIQUID FORMAITON IN CARBON COMPOSITES
【24h】

LIQUID FORMAITON IN CARBON COMPOSITES

机译：碳复合材料中的液体形成

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

Mesophase carbon precursor materials, either mesocarbon microbeads or mesophase pitch, have attracted attention from scientists all over the world in the past decade because of their ability to "self-sinter" into high-density carbon pellets without the help of external binder phase. A number of investigations were conducted to adjust the thermomechanical properties (Bin Hu et al. 2005; Garcia-Rosales et al. 2002).In an effort to improve the fracture properties, the carbonization and graphitization behavior of microbeads provided by Osaka Gas Inc were studied systematically in our group. The effect of processing conditions and additives were investigated. In particular, in the study of TiB_2/C composites, we found that if the pellets were heat treated at 2800K or above, eutectic liquid forms as evidenced by the existence of a layered structure in the polished cross-section. The liquid formation was accompanied by diffusion of a small boron fraction (～lwt %) into the carbon matrix. The extent of graphitization improves dramatically when liquid forms. At high loadings and heat treatment temperatures large crystals, more than 100 microns in length, were observed on the fracture surface. A 50% increase in fracture toughness was achieved with the addition of 10vol% 10micron TiB_2 powder (Zhou et al. 2007).In this study, the investigation was extended to several other liquid-formation capable systems, including TiC/C, ZrB_2/C and Ni/C. The experiments were designed to study the impact of eutectic liquid formation on material properties. Eutectic liquid forms at 2776℃ in the TiC/C (26.2at.%C) composite, 2390℃ in the ZrB_2/C (33at.%C) composite and 1326℃ in the Ni/C (8.9at.%C) composite.
机译：中间相碳前体材料，无论是中间碳微珠还是中间相沥青，在过去的十年中都受到了全世界科学家的关注，因为它们能够在不借助外部粘合剂相的情况下“自烧结”成高密度碳粒。为了调节热机械性能进行了许多研究（Bin Hu等人2005; Garcia-Rosales等人2002）。为改善断裂性能，大阪煤气公司提供了微珠的碳化和石墨化行为。在我们小组中进行了系统研究。研究了加工条件和添加剂的影响。特别是，在TiB_2 / C复合材料的研究中，我们发现，如果将颗粒在2800K或更高温度下进行热处理，则共晶液体会形成，这由抛光截面中存在分层结构证明。液体的形成伴随着少量硼含量（〜1wt％）扩散到碳基质中。当形成液体时，石墨化的程度大大提高。在高载荷和热处理温度下，在断口表面观察到长度超过100微米的大晶体。添加10vol％的10微米TiB_2粉末可将断裂韧性提高50％（Zhou等，2007）。在这项研究中，研究范围扩展到了其他几种具有液体形成能力的系统，包括TiC / C，ZrB_2 / C和Ni / C。设计这些实验是为了研究共晶液体的形成对材料性能的影响。 TiC / C（26.2at。％C）复合材料在2776℃，ZrB_2 / C（33at。％C）复合材料在2390℃和Ni / C（8.9at。％C）复合材料在1326℃形成共晶液体。 。

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