石灰を耐火物に用いた2，3の金属間化合物の真空溶解・鋳造

概要

論文の詳細を見る
Melting and casting experiments of the intermetallic compounds Ni3Al, NiTi, and TiAl were carried out under reduced pressure of argon using lime as a crucible and mold material. The crucible and mold were made by hand-tamping reagent grade calcium oxide powder mixed with calcium chloride-ethanol solution and firing at 950°C for 3 hrs. Solid investment molds made from fused lime slurry were also tested. Comparative experiments were conducted with commercially available alumina, magnesia, and fused lime crucibles and with ceramic shell investment molds made from a mixture of zircon flour and ethyl-silicate. All heats were prepared by charging electrolytic nickel, aluminium ingot, and sponge titanium directly into an induction furnace. It was confirmed that lime crucibles can be safely used to melt all of these alloys but others are only acceptable for Ni3Al melt. Lime molds were easy to remove from castings and cast parts had very limited case depth with enough surface finish quality. Castings made with ceramic shell molds showed tendencies to cracking and surface hardening.
Japan Foundry Engineering Societyの論文