The　sintering　behavior　of　spinel　added　with　TiO2 at 1200 ℃～1700 ℃　was　investigated　and　the　sintering mechanism　was　discussed．The　results　showed　that　the　sinterability　of　spinel　was　greatly　improved　by　adding more　than　0.5 mass％ TiO2．At　a　low　temperature，TiO2 reacted　with　MgA1204 to　form　 MgxAl2（1-x）Ti（1＋x）O5 solid solution，from　which　A1203 and　TiO2 were　segregated　when　the　temperature　was　further　increased．The improvement　in　sinterability　of　spinel　is　considered　to　be　related　to　the　segregation　of　Al203 from　MgxAl2（1－x）Ti(1＋x)O5，the　formation　of　Mg rich　spinel　and　the　dissolution　of　TiO2 in　MgA1204 crystals．

View full abstract