Combustion synthesis of metal-matrix composites. Part 2: The Ti-Ti{sub x}Al{sub y}-Al{sub 2}O{sub 3} system
Combustion synthesis of metal-matrix composites. Part 2: The Ti-Ti{sub x}Al{sub y}-Al{sub 2}O{sub 3} system
复制标题
DOI：
10.1016/1359-6462(95)00448-3
复制
发表时间：
1996-01
影响因子：
6
通讯作者：
A. Kunrath;T. Strohaecker;J. J. Moore-J.
中科院分区：
文献类型：
--
作者：
A. Kunrath;T. Strohaecker;J. J. Moore-J.
通过燃烧合成生产高性能材料（陶瓷、金属间化合物和复合材料）正受到相当大的关注，因为该方法在简单性和相对低的能量需求方面提供了某些优点。燃烧合成（或SHS）可用于生产金属基复合材料的方法在较早的论文中概述。在燃烧合成反应中使用过量的液态金属已经成功地用于获得低孔隙率产品。该金属相可以通过金属氧化物的原位还原或通过向反应物中添加过量的一些金属来产生。已经发现将同时固结（压制）过程与SHS反应耦合产生致密体。本文所讨论的工作是关于合成金属/金属间化合物基复合材料的反应体系，它可以用方程表示。通过该反应，可以产生高体积分数的金属/金属间相。由该反应产生的金属基体主要是Ti{sub 3}Al + Ti的混合物，如Ti-Al相图的适当区域所示。增加x会增加Ti的体积分数。在所研究的四种不同化学计量中仅观察到一种TiAl，即，x = 1，如通过XRD检测的。使用该反应，存在恒定量的过量Al和可变量的过量Ti。这些化学计量比产生具有不同Ti-Al比的复合材料，其允许复合材料的基质组成沿Ti-Al相图的浓度轴沿着变化。
The production of high performance materials (ceramics, intermetallics and composites) by combustion synthesis is receiving considerable attention since the process offers certain advantages with respect to simplicity and a relatively low energy requirement. The methods by which combustion synthesis (or SHS) can be used to produce metal matrix composites were outlined in an earlier paper. The use of excess liquid metal in the combustion synthesis reaction has already been successfully employed to achieve low porosity products. This metallic phase may be generated by an in-situ reduction of a metal oxide or by adding an excess of some metal to the reactants. Coupling a simultaneous consolidation (pressing) process with the SHS reaction has been found to produce dense bodies. This work discussed in this paper is concerned with the synthesis of a metallic/intermetallic matrix composite reaction system which can be represented by equation. With this reaction, high volume fractions of metallic/intermetallic phases can be produced. The metal-matrix produced by this reaction is predominantly a mixture of Ti{sub 3}Al + Ti as indicated in the appropriate area of the Ti-Al phase diagram. Increasing x increases the volume fraction of Ti. TiAl was observed in only one of the four different stoichiometries studied, i.e., x = 1, as detected by XRD. Using this reaction, there is a constant amount of excess Al and a variable excess of Ti. These stoichiometries produce composites with varying Ti-Al ratios that allow the matrix composition of the composite to be varied along the concentration axis of the Ti-Al phase diagram.