Abstract
Combustion synthesis process has been taken an interest in synthesizing technology of intermetallic compound such as Ni3Al. However, the synthesized compound tend to be porous, and the synthesis process has not been used practically. To realize the process, a method of synthesizing the dense products should be developed. In this paper, preparation of full dense Ni3Al by pressure less combustion synthesis process was investigated.
Some kinds of Ni and Al powders which had different particle sizes were used as initial substances. Ni/Al premixed compacts (Ni:Al=3:1) were made by combinations of the powders. The green compacts were heated in a vacuum furnace, and burned by thermal explosion reaction.
It was found that the dense product was obtained in case of the compact consisted of fine powders. However, a little pore was observed in the product. Accordingly, degassing treatment was introduced during the process, then the nearly full dense product was synthesized. By X-ray and EDX analysis, it was confirmed that the synthesized product became to homogeneous Ni3Al. Therefore, the combustion synthesis process is effective to compose the Ni3Al intermetallic compound.
