High heat-resistant Al-Fe-V-Si and Al-Fe-V-Si-X rapidly solidified powder metallurgy (RS P/M) alloys have been developed under well-controlled high purity argon gas atmosphere. The (at. %) RS P/M alloy exhibited high elevated-temperature strength exceeding 300 MPa and good ductility with elongation of 6 % at 573 K. Reduction of partical pressure in P/M processing atmosphere led to improvement in mechanical properties of the powder-consolidated alloys under elevated-temperature service conditions. Ti addition to the Al-Fe-V-Si conduced to enhancement of the strength at room temperature. The tensile yeild strength and ultimate strenght were 545 MPa and 722 MPa, respectively.

The aim of this study is to evaluate the environmental impacts of recovery of valuable metals from the desulfurizing spent catalyst. Molybdenum, vanadium and nickel widely used in the area of catalysis. But the demand of these metals is full filled by industries. Every year, more than 18,000 tons spent catalysts are discarded. In most countries, spent catalyst is classified as a harmful waste. Thus, metal recovery from spent catalyst has been processed. The recovery process of molybdenum, vanadium and nickel from spent catalyst was mainly carried out wet process. However, this process are not suitable for economics and environmental aspects. Because environmental costs for removal of sulfur in the spent catalyst is high and huge amount of industrial wastewater occurs. Thus, it is necessary to develop a process which is efficient and does not cause pollution than the wet process. Thus, we have studied life cycle assessment about the dry process for the recovery of valuable metals.