Effects of zirconia and lanthana co-doping on properties of porous cordierite ceramics
To achieve the low temperature synthesis of cordierite,according to its theoretical ratio,porous cordierite ceramics were prepared using calcined kaolin(≤0.044 mm),sintered magnesia(≤0.074 mm)and silica micropowder(d50=2.6 μm)as main raw materials,analytically pure zirconia and lanthana as sintering aids,and polyvinyl alcohol(PVA)solution as the binder,pressing to samples of φ30 mm×30 mm at 60 MPa,drying and calcining.The effects of the extra additions of zirconia(0 and 8％,by mass)and lanthana(0,0.2％,0.4％,0.6％and 0.8％,by mass)and calcination temperatures(1 200,1 250 and 1 300 ℃)on the cold physical properties,phase composition and microstructure of the porous cordierite ceramics were studied.The results show that:(1)the sample fired at 1 300 ℃ and introduced with 8％zir-conia and 0.6％lanthana shows good physical properties;(2)the co-doping of zirconia and lanthana can improve the mechanical properties of the sample while maintaining the apparent porosity,and promote the formation of cordierite;(3)the co-doping of zirconia and lanthana can reduce the synthesis temperature of cordierite and improve the comprehensive performance of the sample.
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