Original scientific paper
Additives in coarse grain alumina ceramics for metallization
Alenka Š. Kosmos
; IEVT, Teslova 30, Ljubljana, Slovenia
Lidija I. Belič
; IEVT, Teslova 30, Ljubljana, Slovenia
Dimitrij Sušnik
; IJS, Jamova 39, Ljubljana, Slovenia
Abstract
The metal to ceramics seals are widely used as permanent seals in high vacuum technology. For these seals a coarse grain alumina ceramics is needed since a high temperature MoMn metallization is often applied because of several advantages, such as high mechanical strength, low dielectric losses at high frequencies and others. The coarse grain ceramics are produced by sintering alumina with different additives which have to promote densification and grain growth with the liquid phase during sintering. The CaO-SiO2 and CaO-MgO-SiO2 systems were used as additives in the present work. Different characteristics of the formed liquid phases have caused similar densification but different grain growth rates.
Keywords
Hrčak ID:
299603
URI
Publication date:
2.5.1996.
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