Hydrothermal Reaction Sintering of Permalloy-Iron Oxide Composite

Hydrothermal reaction sintering is one of the methods to prepare oxides ceramics. Metals, intermetallic compounds or alloys are sealed in a Pt capsule with water. On heating they react with high pressure high temperature water, and produce metal oxides and hydrogen gas. At high temperatures, hydrogen gas diffuses out of the capsule, then the capsule containing oxide powders is compressed by outside gas pressure. The oxide powders, therefore, can be sintered in the capsule as in HIP (hot isostatic pressing). By this method, we can obtain a metal-oxide composite by the control of water to metal or alloy ratio in the capsule. The known quantities of alloy powders; water-atomized permalloy powder (Fe-47wt% Ni