Abstract
In order to accelerate sintering of Al-Bronze powder covered with passive oxide film, we focused on the way to add Al-Ca fluoride consisting of AlF3 and CaF2, examined effect of CaF2 mixing rate in Al-Ca fluoride, amount of added Al-Ca fluoride and sintering temperature on sintering properties of Al-Bronze powder and considered the mechanism of acceleration of sintering. Al-Bronze powder was sintered most effectively by adding Al-Ca fluoride with CaF2 mixing rate of 20 mass%. If amount of added fluoride was over 0.05 mass% and sintering temperature was over 1123K, the acceleration of sintering of Al-Bronze powder began to appear. On the mechanism of acceleration of sintering, it was presumed that Al2O3 film on the surface of Al-Bronze particles was removed in process of the formation of gaseous AlOF by, the reaction with AlF3, and the reaction was accelerated further by the presence of liquid phase appeared in Al-Ca fluoride.
