フォルステライト磁器の微構造とメタライズについての性質との関係 : 高周波用絶縁材料としてのフォルステライト磁器(第6報)

概要

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In the application of synthetic forsterite porcelains as an excellent electron tube envelope, improvement of metallizing properties is required for firm sealing of porcelains to metal. In this paper, we applied Mo-Mn metallizing test to our synthetic forsterite porcelains and investigated suitable composition and microstructure of porcelain body and preferable metallizing condition. Porcelains containing excess SiO_2 or such additive components as BaCO_3 or ZnO were subjected to reduction and got blackened by heating at 1,300℃ in dry hydrogen, where metallizing process is to be performed. Especially the one containing ZnO was unsuitable because of babbling and cracking caused by liberation of Zn metal. The use of wet hydrogen was found to be preferable to prevent this over-reduction. Addition of a small amount of kaolin to porcelains which had the forsterite composition or slightly MgO richer one, was effective for formation of a reaction interlayer between porcelain and metal, which made their adherence tight and firm. This interlayer was able to be examined by treating specimens with a mixture of nitric acid and alcohol.
社団法人日本セラミックス協会の論文
1963-07-01