短時間メカニカルアロイングで合成したWC-20mass%Fe_3Al合金の機械的特性 Mechanical Properties of WC-20mass%Fe_3Al Alloy Synthesized by Mechanical Alloying for a Short Time Milling
Hard metal, which uses Fe<SUB>3</SUB>Al intermetallic compound binder, is a new wear resistant material with high oxidation resistance. As the particle sizes of Fe<SUB>3</SUB>Al powder synthesized by mechanical alloying process of elementary Fe powder and Al powder were about 30μm, the dispersibility of WC particles was so poor that the mechanical properties of the sintered compact degraded.<BR>WC-20mass%Fe<SUB>3</SUB>Al alloy powder was prepared by mechanical alloying for 72ks using Fe powder, Al powder and WC powder as starting materials. The synthesized MA powder was filled up in a graphite mold and sintered at 1423 K by a pulsed current sintering.<BR>The prepared sintered compact consisted of WC and Fe<SUB>3</SUB>Al phases. This showed that Fe<SUB>3</SUB>Al was synthesized from Fe and Al with a self-propagating high temperature synthesis (SHS) during sintering. The compact showed transverse rupture strength of over 1.3 GPa on account of homogeneous dispersion of Fe<SUB>3</SUB>Al. However, it is necessary to decrease the micropores in order to make a dense compact for industrial application.
粉体および粉末冶金 49(4), 284-289, 2002-04-15
Japan Society of Powder and Powder Metallurgy