Of Beo Ceramic Sintering Aids And Sintering Process On The Performance Impact Of Research

The conventional sintering of BeO ceramics was studied. Using BeO as matrix oxides, five additives systems were chosen as follow: BeO-Fe₂O₃-MgO, BeO-MgO-Al₂O₃, BeO-Al₂O₃-CaO, BeO-TiO₂-CaO and BeO-TiO₂-Al₂O₃, obtain BeO ceramic chips through convention sintering. The affection of different sintering additives to microstructure and properties of BeO ceramic chips was studied. The results show that: in the same sintering conditions, the relative density of BeO-Fe₂O₃-MgO was highest. The effect of Fe₂O₃ and MgO sintering additives promoting sintering is best, then in sequence of BeO-MgO-Al₂O₃,BeO-TiO₂-Al₂O₃,BeO-TiO₂-CaO₂ and BeO-Al₂O₃-CaO.The affection of different sintering temperatures on relative density and thermal conductivity of BeO ceramic was studied. The results show that: along with the sintering temperature increasing from 1580℃to 1680℃, the relative density of each additives system is increasing, and thermal conductivity increasing. The relative density of each sample reaches highest at 1680℃. The thermal conductivity of BeO-MgO-Fe₂O₃ sample is 186.3W/(mK) at 1680℃. The relative of density and temperature coincide with the synthesis sintering action theoretical equation of Huang Peiyun.The affection of different holding time on relative density and thermal conductivity of BeO ceramic was studied. The results show that: at the same sintering temperature, along with the holding time increasing from 40min to 120min, the relative density of samples increasing, the pore reducing, grain size increasing and the thermal conductivity of samples increasing. But the relative density and thermal conductivity of samples increase slowly.The relative of thermal conductivity and microstructure of BeO ceramic was studied. The results show that: the sample with perfect grain growth, polygon grain contour, good grain uniformity, s few tomata and well distributed grain boundary phase has high thermal conductivity.The affection of various factors on properties of BeO ceramic was studied. The optimum technology parameters were obtained by orthogonal tests. The sintering temperature is 1680℃, the holding time is 120min, and the sintering additive is MgO-Fe₂O₃. The relative density of samples is high. The effect of sintering additives to testing index is the biggest one of all factors, and the sintering temperature takes second place, the holding time influence least.