Layered machinable ceramics for high temperature applications
Layered machinable ceramics for high temperature applications
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DOI：
10.1016/s1359-6462(96)00418-6
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发表时间：
1997-03-01
影响因子：
6
通讯作者：
ElRaghy, T
中科院分区：
文献类型：
--
作者：
Barsoum, MW;Brodkin, D;ElRaghy, T
最近，作者报道了层状三元化合物Ti3SiC2的制备和表征，发现它结合了金属和陶瓷的许多最好的属性。与金属一样，它是一种优良的电导体和热导体，易于加工，相对柔软，不受热震影响，在较高温度下表现为可塑性。像陶瓷一样，它是抗氧化的，耐火的，最重要的是，它保持了它的强度，使温度使目前可用的最好的高温合金无法使用。在认识到Ti3SiC2具有优异的性能后，作者对其他具有相同化学结构的化合物进行了文献检索。他们只发现了一个，即：Ti{sub3}GEC{sub2}，它的性质与Ti{sub3}SiC{sub2}非常相似。这篇论文的目的有两个。首先论证了H相、Ti{sub3}GEC{sub2}和Ti{sub3}SiC{sub2}性质的相似性。第二是提出一些令人信服的微观结构证据，表明这些化合物的行为像多晶纳米层状物。为此，作者制备并表征了如下H相：Ti{sub2}Alc，Ti{sub2}AlN，Ti{sub2}GEC以及Ti{sub3}GEC{sub2}。此外，他们还制备了V{sub2}Alc、Ta{sub2}Alc和Nb{sub2}Alc，并测试了它们的加工性。
Recently the authors reported on the fabrication and characterization of a layered ternary compound Ti{sub 3}SiC{sub 2}, that was found to combine many of the best attributes of metals and ceramics. Like metals it is an excellent electric and thermal conductor, easily machinable, relatively soft, not susceptible to thermal shock and behaves plastically at higher temperatures. Like ceramics it is oxidation resistant, refractory, and, most importantly, it maintains its strength to temperatures that render the best superalloys available today unusable. Upon realizing the remarkable properties exhibited by Ti{sub 3}SiC{sub 2} the authors carried out a literature search for other compounds with the same chemistry. They found one only, namely: Ti{sub 3}GeC{sub 2} which has properties that are very similar to Ti{sub 3}SiC{sub 2}. The purpose of this paper is two-fold. The first is to demonstrate the similarities between the properties of the H-phases, Ti{sub 3}GeC{sub 2} and Ti{sub 3}SiC{sub 2}. The second is to present some compelling microstructural evidence that indicates that these compounds behave as polycrystalline nanolaminates. To that effect the authors fabricated and characterized the following H-phases: Ti{sub 2}AlC, Ti{sub 2}AlN, Ti{sub 2}GeC and as well as Ti{sub 3}GeC{sub 2}. In addition they fabricated V{sub 2}AlC, Ta{sub 2}AlC, and Nb{sub 2}AlC and tested their machinability.