摘要
为了提高锂离子电池正极材料用匣钵的使用寿命,以桂广滑石、鹤壁煅烧铝矾土和鹤壁堇青石熟料为原料,采用原位合成技术制备了镁铝尖晶石-堇青石复相陶瓷。测试和分析了烧结样品的吸水率、气孔率、体积密度、抗折强度、抗热震性能、物相组成以及显微结构。实验结果表明,采用原位合成的镁铝尖晶石-堇青石复相陶瓷的晶粒分布均匀、结合紧密,明显提高了样品的抗热震性和耐腐蚀性。最佳配方为经1 360℃烧成的A2样品（桂广滑石47.72%、煅烧铝矾土46.49%、堇青石熟料5.79%）,其吸水率为0.37%、气孔率为0.95%、体积密度为2.59g/cm3、抗折强度为114.12 MPa。堇青石熟料的最佳添加量为5.79%,添加少量堇青石熟料起到晶核剂作用,同时能够显著地降低样品的吸水率和气孔率,提高样品的体积密度、抗折强度和抗热震性能,拓宽样品的烧成范围。通过XRD和SEM分析表明,烧成样品的相组成为堇青石和镁铝尖晶石,样品的晶体发育比较完善,堇青石呈六方柱状,纵横交错排列,镁铝尖晶石呈颗粒状,分布于堇青石晶粒之间。30次热震（1 100℃～室温）后经1 360℃烧成的A2样品的相组成没有明显的变化,抗热震性能较优。
Using Guiguang talc,Hebi calcined bauxite and Hebi cordierite clinker as raw materials,the spinel-cordierite composite ceramics were fabricated by the in-situ synthesized technology.The water absorption,porosity,bulk density,bending strength,thermal shock resistance,phase composition and microstructure of the sample were tested and analyzed.The experimental results indicate that in-situ synthesized spinel combined cordierite exhibits homogeneous distribution and linking tightness,significantly improves the thermal shock resistance and corrosion resistance of the composite ceramic.The best formula is A2 which is sintered at 1 360℃（Guiguang talc is 47.72%,calcined bauxite is 46.49%,clinker cordierite is 5.79%）with water absorption of 0.37%,apparent porosity of 0.95%,bulk density of 2.59g/cm3,and bending strength of 114.12 MPa.The best dosage of Cordierite clinker is 5.79%,adding small amount of cordierite clinker works as nucleating agent,and it will significantly reduce water absorption and porosity of the samples,increase the bulk density,bending strength and thermal shock resistance,and expand firing range of the sample.XRD and SEM studies show that the phase composition of the sintered specimens are spinel and cordierite.Relatively perfect growth of hexagonal columnar cordierite crystals were observed uniformly distributing throughout the composites,with granular spinel existing between cordierite grains.There is no significant change in the composition of the sample A2 fired at 1 360 ℃ after 30 times of thermal shock cycles（1 100 ℃ ～ room temperature）,and the thermal shock resistance is better.
出处
《武汉理工大学学报》
CAS
北大核心
2016年第3期15-22,共8页
Journal of Wuhan University of Technology
基金
湖北省科技支撑计划项目(2015BCE082)
