B-2 SURFACE COATING FOR DUCTILE CAST IRON BY CONSOLIDATION AT LOW HEAT IN MECANICALLY ALLOYED Ni-Al-Si POWDERS(Session: Coatings)

Abstract

Mechanical alloying (MA) of Ni-74.9mol%Al-3.1mol% Si powder mixtures was performed for relatively short milling times by planetary ball mill. The MA powders were coated on ductile cast iron (JIS-FCD450) by vacuum hot pressing at a relatively low temperature (873K) to investigate potential for mechanochemical activation of MA on surface coating. At the optimal milling time, the coated layer was well-reacted with high density (almost no pores) and high hardness (max. 1110HV).