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目的:探讨粉浆制备过程中粉液比的改变对可切削渗透陶瓷(MIC)氧化铝基体性能及微观结构的影响。方法:以P型α-Al2O3粉体为研究对象,粉浆的粉液比(重量比)分别为3.5、4.5、5.5、6.5、7.5、8.5、9.5、10.5。经调拌注浆成型,于1200℃/2h预烧成氧化铝基体,测定基体的物理性能并对其结构进行扫描电镜观察。结果:当粉液比增加时坯体堆积密度增加,线收缩率降低。经预烧后氧化铝基体具有较高的抗弯曲强度,扫描电镜观察可见多孔形貌,Al2O3颗粒间出现局部熔接现象且随预烧温度升高而增多。结论:MIC基体的制作工艺简便,堆积密度高,孔隙率适中,坯体线收缩率小,是一种理想的渗透陶瓷基体
OBJECTIVE: To investigate the effect of powder to liquid ratio on the properties and microstructure of machinable infiltrated ceramic (MIC) alumina substrates. Methods: The P-type α-Al2O3 powder was used as the research object. The ratio of powder to liquid (weight ratio) was 3.5, 4.5, 5.5, 6.5, 7.5, 8.5, 9.5 and 10.5 respectively. After blending and casting, the alumina matrix was calcined at 1200 ℃ / 2h. The physical properties of the matrix were measured and its structure was observed by scanning electron microscopy. Results: As the ratio of powder to liquid increased, the bulk density increased and the linear shrinkage decreased. After calcined, the alumina matrix has high flexural strength, porous morphology is observed by scanning electron microscopy, local fusion phenomenon appears between Al2O3 particles and increases with the increase of calcination temperature. CONCLUSION: The MIC matrix has the advantages of simple process, high bulk density, moderate porosity and low shrinkage of the green body, making it an ideal infiltration ceramic matrix