| 查看: 234 | 回复: 2 | |||
| 当前主题已经存档。 | |||
weainug木虫 (正式写手)
|
[交流]
【学术文章】【原创】一篇 美陶 关于高温陶瓷的综述性文章
|
||
|
This paper reviews the crystal chemistry, synthesis, densification, microstructure, mechanical properties, and oxidation behavior of zirconium diboride (ZrB2) and hafnium diboride (HfB2) ceramics. The refractory diborides exhibit partial or complete solid solution with other transition metal diborides, which allows compositional tailoring of properties such as thermal expansion coefficient and hardness. Carbothermal reduction is the typical synthesis route, but reactive processes, solution methods, and pre-ceramic polymers can also be used. Typically, diborides are densified by hot pressing, but recently solid state and liquid phase sintering routes have been developed. Finegrained ZrB2 and HfB2 have strengths of a few hundred MPa, which can increase to over 1 GPa with the addition of SiC. Pure diborides exhibit parabolic oxidation kinetics at temperatures below 11001C, but B2O3 volatility leads to rapid, linear oxidation kinetics above that temperature. The addition of silica scale formers such as SiC or MoSi2 improves the oxidation behavior above 11001C. Based on their unique combination of properties, ZrB2 and HfB2 ceramics are candidates for use in the extreme environments associated with hypersonic flight, atmospheric reentry, and rocket propulsion. [ Last edited by weainug on 2007-5-19 at 07:55 ] |
回复此楼» 猜你喜欢
有多少人是今天查系统知道结果的？
已经有17人回复
-
看板上这么多中的，有点像50人群里49个人都是骗子的那种感觉……
已经有5人回复
-
导师吐槽：我怎么摊上了这么个极品研究生！
已经有4人回复
-
基金不中，共勉
已经有7人回复
-
为什么 国际(地区)合作与交流项目 没有放榜？
已经有11人回复
-
让我中一个面上吧！
已经有17人回复
-
国自然面上复盘~欢迎讨论
已经有8人回复
-
售SCI一区文章，我:8.O.551.O.5.4,科目全,可伽急
已经有4人回复
-
售SCI一区T0P文章，我:8.O.55.1.O.54,科目齐全,可+急
已经有4人回复
-
我不理解！
已经有23人回复
2楼2007-05-20 21:43:17
