Process of hot isostatic pressing of ferrite material

Details Process of hot isostatic pressing of ferrite material Process of hot isostatic pressing of ferrite material

C - Chemistry, Metallurgy

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B

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C04B 35/64 (2006.01) B28B 3/00 (2006.01) C04B 35/26 (2006.01) C04B 35/645 (2006.01)

Patent

CA 1251621

ABSTRACT Process of hot isostatic pressing of MnZn ferrite ma- terial for producing ferrite close to theoretical density without a significant increase in grain size. Permeability is increased with the increase in theoret- ical density. The process includes the steps of pressur- izing an entire ferrite sample which is surrounded by pieces of similar composition while in alumina crucibles with fused alumina grain there between and an optional ox- ygen getter on top of the grain, introducing an inert at- mosphere, elevating pressure and temperature, the temperature elevated to a value below that previously used for sintering or hot pressing, and maintaining tem- perature to optimize density without excess grain growth. Density is thereby optimized without excess grain growth, while maintaining or improving the magnetic properties.

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