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采用硅溶胶冷冻胶凝陶瓷成型技术制备Si3N4/BAS陶瓷复合材料,分析了硅溶胶冷冻胶凝技术原理和特点,并对Si3N4/BAS陶瓷复合材料性能及微观形貌进行了研究。结果表明:该成型方法所获得的坯体干燥无变形无开裂,收缩率小于1%;陶瓷烧结体密度为2.9 g/cm3时,烧结体抗弯强度、弯曲弹性模量、断裂韧性以及洛氏硬度分别为350 MPa、193GPa、6.2 MPa·m1/2和58。该成型技术实现了陶瓷界多年来对先进陶瓷高效、低成本、原位近净尺寸成型的追求。
The Si3N4 / BAS ceramic composite material was prepared by using the technology of gel formation of silica sol gel. The principle and characteristics of the freeze-gel technology of the silica sol were analyzed. The properties and microstructure of the Si3N4 / BAS ceramic composite material were also studied. The results show that the green body obtained by the forming method has no deformation and no cracking during drying, the shrinkage rate is less than 1%, the flexural strength, flexural modulus, fracture toughness and Rockwell hardness of the sintered body at the ceramic sintered body density of 2.9 g / cm3 Hardness of 350 MPa, 193 GPa, 6.2 MPa · m1 / 2 and 58 respectively. The molding technology to achieve ceramic industry over the years of advanced ceramics efficient, low cost, near-net size of the pursuit of shape.