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Home Georgian Technologies Self-Propagating High-Temperature Synthesis (SHS) for Production of Single-Phase Nanocrystalline Materials of Ti-Al System

Self-Propagating High-Temperature Synthesis (SHS) for Production of Single-Phase Nanocrystalline Materials of Ti-Al System

Description

Wide application of the alloys based on titanium aluminides is restrained by the lack in effective and inexpensive production technologies. Development of relatively simple and reasonably priced technology for production of Ti-Al intermetallics is an important and still unsolved task. The most suitable technological process, possessing considerable potential for production of composites with the peculiar properties is the Self-propagating High-temperature Synthesis (SHS). The method is simple and is characterized by low energy consumption, low cost, reliability of the equipment used, and purity of the synthesized product.

Innovative Aspect and Main Advantages

The existing technologies of SHS-thermal explosion may produce in the Ti-Al system compounds in the form of powders (here, no single-phase compounds are available). These powders are used in powder metallurgy as a starting material and as a coating for the surfaces of different components. We are first, proposing two technologies of fabrication of single- phase (by means of X-ray diffractometry) components made from Ti-Al compounds, which are compacted and porefree. These technologies are performed in two modes: combustion and thermal explosion with the subsequent compacting of the synthesized product. The material has fine microstructure, and in particular cases even nano-structure which makes them very attractive because of expected increase in strength and plastic characteristics of the material.

Areas of Application

These alloys may be used not only for aircraft- and surface engines, but also in other branches of industry. In the case of the synthesis of TiAl or Ti3Al in the mode of thermal explosion, the synthesis is caused by the SHS reaction of 10B isotope- containing starting mixture. This reaction results in a light, pore-free and efficient armor material. One layer of the end product consists of TiAl or Ti3Al nanostructured material, with the sizes of grains 70 ÷ 90 nm, and the second layer is a hard alloy containing 10B isotope. This material can be successfully used for protection of space crafts against radiation and meteorites.

Single phase and nano structured materials.
Fig. 1 Single phase and nano structured materials.

Microstructure of nano structural material of Ti-Al system.
Fig. 2 Microstructure of nano structural material of Ti-Al system.

Stage of Development

It is elaborated the technology of obtaining the material and is covered by Georgian patent. A prototype is available for testing.

Contact Details

George Oniashvili
Organization: F.Tavadze Institute of Metallurgy and Materials Science
Address: 15, Al Kazbegi 0160 Tbilisi, Georgia
(+995 32) 38 2942; (+995 99) 41 6162
This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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