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将掺Ca铬酸镧与Al2O3混合,在1650℃烧结得到氧化铝量从0~100%(摩尔分数)的系列Al2O3/La0.9Ca0.1CrO3复合材料烧结体。研究得出Al2O3/La0.9Ca0.1CrO3系统是热力学不稳定的,高温烧结时存在离子扩散,烧结体的最终相组成与Al2O3量有关。复合材料中氧化铝含量较低时(≤20%,摩尔分数)可以提高铬酸镧粉体的烧结性能;当氧化铝含量在30%~70%(摩尔分数)之间时,生成的层片状六铝酸镧使烧结致密度降低,并在氧化铝含量为70%(摩尔分数)时达到最低值,随后试样的相对密度又逐渐增大。
The mixed Ca-lanthanum chromite is mixed with Al2O3 and sintered at 1650 DEG C to obtain a series of Al2O3 / La0.9Ca0.1CrO3 composite sintered bodies with an alumina content of 0-100% (mole fraction). The results show that the Al2O3 / La0.9Ca0.1CrO3 system is thermodynamically unstable, with ion diffusion at high temperature sintering. The final phase composition of the sintered body is related to the amount of Al2O3. When the alumina content in the composite is low (≤20%, mole fraction), the sintering performance of the lanthanum chromite powder can be improved. When the alumina content is between 30% and 70% (mole fraction) The lanthanum hexaaluminate reduced the sintering densities and reached the lowest value when the alumina content was 70% (mole fraction), and then the relative density of the samples gradually increased.