为了降低复相材料的合成温度并保证其相应的物理性能，以质量分数分别为35．16％的欠烧白云石和64．84％的片状氧化铝为原料，在1050、1100和1150℃下利用放电等离子烧结法（SPS）制备了刚玉－铝酸钙－镁铝尖晶石复相材料，并研究了烧成温度对复相材料的物相组成及强度的影响。结果表明：随着温度的升高，复相材料中刚玉相的含量逐渐降低，而铝酸钙和镁铝尖晶石的含量逐渐上升，材料的显气孔率略有增大，但是其劈裂抗拉强度逐渐增大。放电等离子烧结使复相材料中片状刚玉、生成的铝酸钙和镁铝尖晶石在高温下相互结合。当烧成温度为1150℃时，所制备的复相材料显气孔率为23．2％，劈裂抗拉强度达到20 MPa。
In order to reduce the synthesis temperature of the composite material and maintain its physical properties,corundum-calcium aluminate-magnesium aluminate spinel composites were prepared using 35.16 mass% underburnt dolomite and 64.84 mass% flake alumina as raw materials by spark plasma sin-tering at different temperatures (1 050,1 100,and 1 150 ℃).The effects of the firing temperature on phase composition and strength of corundum-calcium aluminate-magnesium aluminate spinel composites were investigated.The results show that with the temperature increasing the corundum content decreases gradu-ally,while the contents of calcium aluminate and magnesium aluminate spinel gradually increase,the ap-parent porosity of composites slightly increases while the splitting tensile strength improves;flake corun-dum,formed calcium aluminate and magnesium aluminate spinel bond together at high temperatures by spark plasma sintering.The composites with the apparent porosity of 23.2% fired at 1 150 ℃ achieve the splitting tensile strength of 20 MPa.
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