Effects of Sm2O3 addition and heat treatment temperature on properties of CA6-MA materials
To improve their properties,calcium hexaluminate-magnesium aluminate spinel(CA6-MA)com-posites were prepared using CaO,MgO,Al2O3,and Sm2O3 as raw materials through a high-temperature solid-phase sintering method.The effects of the Sm2O3 addition(0,2％,4％,and 6％,by mass,extra-adding)and heat treatment temperature(1 400,1 500,and 1 600 ℃)on the phase composition,apparent porosity,bulk density,cold modulus of rupture,and microstructure of the CA6-MA composites were investi-gated.The results indicate that:(1)the synthesis reaction of CA6 can be promoted by increasing the heat treatment temperature appropriately;when the heat treatment temperature is 1 600 ℃,only CA6 and MA ex-ist in the sample;(2)the introduction of Sm2O3 promotes the crystal development of MA,and CA6 tends to become equiaxed,significantly improving the density of the sample;(3)the sample with 6％Sm2O3 exhibits the optimal comprehensive properties after firing at 1 600 ℃,with the bulk density of 3.26 g·cm-3,the ap-parent porosity of 13.4％,and the cold modulus of rupture of 135 MPa.
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