Mg-B-Cのメカニカルアロイングとその固化成形 Synthesis of Mg-B-C by Mechanical Alloying and Their Consolidation
Mg-10at%B, Mg-20at%B, Mg-60at%B, Mg-75at%B and Mg-20at%B-5at%C were synthesized by mechanical alloying (MA) of Mg powder, boron powder and graphite powder using a vibrational ball milling in argon gas atmosphere for 720ks. Mg-10at%B, like Mg, was agglomerated into a mass by continuous rolling during MA process. Boron addition was effect to produce powder, but the contamination of Fe from the vessel and balls increased with increasing boron content in the MA powder. Since Mg-20at%B synthesized by MA was very fine powder, it was able to consolidate at 573K under a pressure of 195MPa by pulsed current sintering process. The sintered body of Mg-20at%B has a homogeneous microstructure, a density of 1.82g/cm<SUP>3</SUP> and a hardness of 90Hv. In case of Mg-20at%B-5at%C, hard particles were obtained during the MA process and changed into other phase during the sintering process.
粉体および粉末冶金 45(10), 965-968, 1998-10-15
Japan Society of Powder and Powder Metallurgy