MANUFACTURING METHOD OF HIGH FREQUENCY FORSTERITE PORCELAIN FROM ASBESTOS

摘要

PROBLEM TO BE SOLVED: To manufacture a high-frequency forsterite (Mg2SiO4) porcelain by using an asbestos (chrysotile: Mg3Si2O5(OH)4), that is, to manufacture a high quality forsterite by using a raw material obtained by removing impurities such as iron etc. from the asbestos by an acid treatment since the forsterite having a large Q×f value being a performance index of a high-frequency characteristic can not be obtained when the asbestos is used as it is as a raw material of the forsterite because the asbestos is a natural mineral and includes many impurities.

SOLUTION: An impure iron can be simultaneously eluted with an Mg2+ion by subjecting the asbestos (chrysotile: Mg3Si2O5(OH)4) to a hydrochloric acid-treatment and a high purity amorphous SiO2fiber can be manufactured. A forsterite powder can be manufactured by subjecting the SiO2fiber and a reactive MgO to a solid phase reaction. A dense forsterite porcelain can be obtained by subjecting the obtained forsterite powder to electropulsing sintering and the Q×f value of the porcelain is more than 100,000 GHz.

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