抄録
Aluminide systems such as Ti-Al, Ni-Al and Fe-Al are known to induce combustion synthesis at lower temperatures by moderate mechanical alloying (MA) of the elemental powders. This study investigated the potential for applying this mechanochemical activation effect. Surface coating by reaction sintering of Ni-74.9mol%Al-3.1mol%Si and Ni-75mol%Al MA powders was performed for spheroidal graphite cast iron (JIS FCD450) by vacuum hot pressing at a relatively low temperature (773-873K), respectively. The coated layers for both of them were well-reacted. In the case of Ni-74.9mol%Al-3.1mol%Si, the density was high (almost no pores) and the hardness was high (more than 1000HV), but in the case of Ni-75mol%Al, they decreased considerably.
