Abstract
Beryllium oxide, by virtue of its electrical resistivity and high thermal conductivity has a unique place in its application as a material for insulator components in electronics for which impervious high density bodies are requested. As BeO is a difficult material to sinter to high densities at temperatures less than 1600°C, CaO was considered as one of the additives that enhance densification without impairing the electrical properties. The influence of 0.5 to 5 wt% addition of CaO on the sintering behaviour of BeO derived from beryllium sulphate was studied at temperatures between 1100° and 1500°C in vacuum and air atmospheres. It was found that CaO addition substantially enhanced densification with concurrent grain growth and reduced open porosity.
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