FIZIKA A 5 (1996) 2, 85-90

ADDITIVES IN COARSE GRAIN ALUMINA CERAMICS FOR METALLIZATION

ALENKA Š. KOSMOS, LIDIJA I. BELIČ and DIMITRIJ SUŠNIK^a
IEVT, Teslova 30, Ljubljana, Slovenia
^aIJS, Jamova 39, Ljubljana, Slovenia

Received 7 April 1995
Revised manuscript received 12 January 1996

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.

UDC 538.91
PACS 61.20.-p

Copyright by The Croatian Physical Society
For problems or questions please contact fizika@fizika.hfd.hr