Studies on Combustion Synthesis for Two-and Three-Components Systems
-Effects of Various Parameters on the Propagation Mechanism of
Combustion Wave-
1998 Naohiro Shibata
Attention has been drawn
for
Self-propagating High-temperature Synthesis (SHS), as a new methodfor
synthesizing metallic, ceramic, and composite materials. Because of the use of high exothermic reactions between atoms in synthesizing materials, it has many advantages compared to conventional meihods. Advantages are that (a) it is a simple process, that (b) its energy requirement is low, and that (c) rapid synthesis can be made.In
addition, more than hundreds of materials can be synthesized by SHS. Because of the reasons listed above, many studies about this method have been made from the view-point of the materials science. However,it
has been rare to study propagation of SHS combustion.wave, from view-point of the combustion science.In order to make good use of the advantages of SHS and to have good materials as fine final combustion products,
it
is necessary to make it clear about effects of various parameters such as mixture ratio, initial temperature, diameter of particles, relative density, and so on, on the propagation of SHS combustion wave. In the present study, first, SHS is applied forTi-Al
system which is expected for its light weight and strong strength under high temperature, and the effects of various parameters on the burning velocity, the combustion mode, and the range of flammability are investigated experimentally. Next, SHS combustion behavior for the Ti-Al-C system is examined, related to function of the functionally graded materials (FGMs), one side of which is ceramics the other side is metals, and the component inside the material gradually changes from ceramics to metal. Importance in studying mechanism in SHS process is also pointed out in controlling not only cracks which appear during combustion but also pores which induce expansion of combustion products.
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