Cordierite,Guizhou kaolin,Suzhou kaolin,Zhangzhou kaolin,black mud,calcined talc,zirconia and calcium phosphate were used as the main raw materials to prepare cordierite heat-resistant ceramics by solid reaction.The properties of the samples were characterized by XRD,thermal expansion instrument,universal material testing machine and other test methods.The effect of phosphate on the properties of cordierite heat-resistant ceramics was analyzed and compared.The results showed that When CaCO3 was 1.5 mol%,the purity of the synthesized zirconium calcium phosphate was the highest.On this basis,5 wt%CaZr4(PO4)6 were added,The thermal expansion coefficient of cordierite heat-resistant ceramic was 2.61×10-6/℃and the bending strength was 65 MPa.When the content of calcium phosphate was 2.5 wt%,the thermal expansion coefficient of cordierite heat-resistant ceramics was 2.58×10-6/℃,and the bending strength was 79 MPa.
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