Preparation of calcium zirconate materials by two-step sintering
In order to improve their density,calcium zirconate(CaZrO3)materials were prepared with calci-um carbonate and zirconia as raw materials by the two-step sintering method:pre-firing—crushing—press-ing—high temperature sintering.The effects of the pre-firing temperature(1 200,1 300,1 400,and 1 500 ℃)on the microstructure and cold properties of the CaZrO3 materials were studied.The results show that:(1)the two-step sintering method can make the distribution of raw materials uniform and the reaction thorough,and avoid the expansion cracking of the sample caused by zirconia phase transformation;(2)when the pre-firing temperature is 1 400 ℃,the sample has the optimal comprehensive properties:the main crystal-line phase CaZrO3 reaches 99 mass％,the average grain size is 4-5 μm,the apparent porosity is 1.6％,the bulk density is 4.40 g·cm-3,and the cold compressive strength is 590 MPa.
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