ABSTRACT The machinability of newly developed zirconia ceramics for computer numerically controlled milling (CNC) was investigated. The zirconia blanks were prepared by the gelcasting method and tested in the green and two pre-sintered states. All blanks exhibited uniform sintering shrinkage in all directions. The blanks were investigated from the viewpoint of surface milling roughness, quality of milled edges and sharp tips, and machinability of thin structures. The best milling results were obtained for the blanks pre-sintered at 900°C/1 h. Mechanical properties of zirconia blanks, such as biaxial flexural strength, microhardness, indentation elastic modulus, and fracture toughness were determined in the green and pre-sintered states (900 and 1100°C/1 h) and the correlation with the milling results was discussed. The biaxial strength tests of sintered discs showed the advantage of optimised surface milling over conventional polishing.

中文翻译：

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凝胶注模法制备氧化锆陶瓷的切削加工性能及性能

摘要 研究了新开发的用于计算机数控铣削 (CNC) 的氧化锆陶瓷的机械加工性。氧化锆坯料通过凝胶注模法制备，并在生坯和两种预烧结状态下进行测试。所有坯料在各个方向上均表现出均匀的烧结收缩。从表面铣削粗糙度、铣削边缘和锋利尖端的质量以及薄结构的可加工性的角度对毛坯进行了研究。在 900°C/1 h 下预烧结的坯料获得了最好的铣削结果。在生坯和预烧结状态（900 和 1100°C/1 小时）下测定了氧化锆坯料的机械性能，如双轴弯曲强度、显微硬度、压痕弹性模量和断裂韧性，并讨论了与铣削结果的相关性.