Synthesis of ternary intermetallics by exothermic reaction
Synthesis of ternary intermetallics by exothermic reaction
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DOI：
10.1016/s0924-0136(01)00604-5
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发表时间：
2001-06-15
影响因子：
6.3
通讯作者：
Murali, S
中科院分区：
文献类型：
--
作者：
Sritharan, T;Murali, S
二元金属间化合物如NiAl、TiAl、FeAl、Ni 3Al、Ti 3Al等的制造原则上是可能的，因为它们的反应的放热性质而使元素反应。然而，在实践中，必须优化几个因素以产生相对纯形式的化合物。影响生产的参数的实例是粉末混合物的组成、粒度、混合效率和合成温度。三元金属间化合物造成更大的生产困难，因为三种元素必须紧密混合，而不是两种，以使产品的化学组成均匀。此外，这三种元素必须同时反应，以防止通过仅两种元素之间的反应形成二元金属间化合物。本文介绍了用Al-Fe-Si三元金属间化合物的元素放热合成法制备Al-Fe-Si三元金属间化合物的一些有趣结果。所用的生产方法是常规的粉末技术，即球磨、冷压和真空加热。它示出，虽然初始粉末混合物的组合物确定的产品相，一些已知的三元AlFeSi相不能产生，即使当粉末混合物的组合物是化学计量的。研究了颗粒尺寸和球磨速度对粉体性能的影响。它的结论是，只有一些已知的三元相，可以通过这种技术，必须优化的颗粒尺寸和研磨参数，以产生一个纯的三元化合物。(C)2001 Elsevier Science B. V.保留所有权利。
The manufacture of binary intermetallic compounds such as NiAl, TiAl, FeAl, Ni3Al, Ti3Al, etc, is possible, in principle, by reacting the elements because of the exothermic nature of their reactions. In practice, however, several factors must be optimized to produce a compound in a relatively pure form. Examples of the parameters that affect the production are the composition of the powder mix, the particle size, the efficiency of mixing and the synthesis temperature. A ternary intermetallic compound poses even greater production difficulties, since three elements have to be mixed intimately, instead of two, for the product to be uniform in chemical composition. Furthermore, the three elements must react simultaneously to prevent binary intermetallics forming by reaction between only two of the elements. This paper presents some interesting results obtained in making a ternary Al-Fe-Si intermetallic by exothermic synthesis from its elements. The production method used is a conventional powder technique, i.e. ball milling, cold pressing and heating in vacuum. It is shown that although the composition of the initial powder mix determines the product phase, some known ternary AlFeSi phases cannot be produced even when the powder mix composition is stoichiometric. The effect of particle size and ball milling speed are also investigated. It is concluded that only some of the known ternary phases could be produced by this technique and that the particle size and milling parameters must be optimized to produce a pure ternary compound. (C) 2001 Elsevier Science B.V. All rights reserved.