Abstract
Recently, super engineering plastics containing various kinds of fillers and a very corrosive fluorocarbon resin are increasing in the plastic injection molding. Injection molding machine parts used in severe molding conditions requires excellent mechanical properties and corrosion resistance of the part materials. In this paper, in order to investigate the applicability of Mo2NiB2 base cermets, having high corrosion resistance, into injection molding machine parts, the mechanical properties and corrosion resistance of the cermets with the composition of Ni-5.0mass%B-51.0mass%Mo-(17.5-X)mass%Cr-Xmass%V (X=0∼10.0) cermets were studied. Transverse rupture strength (TRS) and hardness of the cermets increased monotonically with increasing V content and reached the maximum values of 2.94GPa and 87.2HRA at 10.0mass%V (X=10.0), respectively. The excellent corrosion resistance for a molten fluorocarbon resin together with relatively high TRS was obtained up to 5.0mass%V (X=5.0).
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