A novel approach to develop composite ceramics based on active filler loaded precursor employing plasma assisted pyrolysis
A novel approach to develop composite ceramics based on active filler loaded precursor employing plasma assisted pyrolysis
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DOI：
10.1016/j.matdes.2015.10.057
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发表时间：
2016-01-05
影响因子：
8.4
通讯作者：
Motz, Guenter
中科院分区：
文献类型：
--
作者：
Seifert, Martin;Goncalves, Priscila;Motz, Guenter
这项工作的目的是首次采用等离子体辅助热解（PAP）的新工艺开发致密的陶瓷复合材料的基础上的聚有机硅氮烷作为陶瓷形成的粘合剂和TiSi 2作为活性filler.Initially它是必要的，以研究PAP的前体的热解行为相比，传统的热解的影响。我们可以证明陶瓷产率以及聚有机硅氮烷的元素组成不会受到PAP工艺的不利影响。这表明在等离子体气氛下没有发生前体的解聚，这是用作陶瓷粘结剂制造陶瓷复合材料的先决条件。TiSi 2在空气中热处理期间表现出高的增重，但在N-2气氛下转化为氮化物是不充分的。相比之下，PAP的使用不仅导致增强的填料转化，而且导致复合材料的致密化。结果表明，等离子体辅助热解是一种制备致密Ti-Si-C-N复合材料的合适技术。(C)2015爱思唯尔有限公司版权所有。
Aim of the work was to employ for the first time the novel process of plasma assisted pyrolysis (PAP) for developing dense ceramic composites based on a polyorganosilazane as a ceramic forming binder and TiSi2 as active filler.Initially it was necessary to investigate the influence of PAP on the pyrolysis behavior of the precursor in comparison to conventional pyrolysis. We could demonstrate that the ceramic yield as well as the elemental composition of the polyorganosilazane are not adversely influenced by PAP process. This is an indication that no depolymerization of the precursor occurred under plasma atmosphere, which is a precondition for the use as ceramic binder to manufacture ceramic composites.TiSi2 exhibits a high mass gain during thermal treatment in air, but the conversion under N-2 atmosphere into nitrides is insufficient. In contrast the use of PAP led not only to an enhanced filler conversion but also to a densification of the composite. The resulting microstructure is dominated by Ti(C,N) as well as a mixture of alpha- and beta-Si3N4 phases embedded in an amorphous SiCN matrix.It could be demonstrated that plasma assisted pyrolysis is a very suitable technology to process dense Ti-Si-C-N composite materials with a tailored microstructure. (C) 2015 Elsevier Ltd. All rights reserved.