【摘要】 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更多还原

【Abstract】 Objective:To explore the effects of different powder/liquid ratio during the procedure of aluminum oxide slip preparation on the properties and microstructure of the machinable infiltrated ceramic(MIC) aluminum matrice. Methods: PⅠα Al\-2O\-3 powder was employed in this study. Aluminum slip with different powder/liquid ratios of 3.5, 4.5, 5.5, 6.5, 7.5, 8.5, 9.5 and 10.5 was prepared separately. Specimens were slip casted and pre fired, and whose physical properties were determined and morphology of specimens was examined under scanning electromicroscope.Results: The packing density increased while the linear shrinkage decreased, when the powder/liquid ratio increased. Elevated pre firing temperature resulted in higher flexural strength of the matrice. The matrice demonstrated porous morphology under electromicroscope, and neck fusion between Al\-2O\-3 particles was observed and increased with elevated prefiring temperature.Conclusion: MIC is a kind of easy manipulated material with high packing density, optimum porosity and lower linear shrinkage, so it may be an ideal aluminum matrix for infiltrated ceramic.\;更多还原