基于振荡压力烧结的氧化锆陶瓷水热老化行为

Hydrothermal Aging of Zirconia Ceramics Consolidated by Oscillatory Pressure Sintering

采用振荡压力烧结法制备了致密度高、晶粒细化、力学性能优异的氧化锆陶瓷,研究了水热老化时间对两种氧化锆陶瓷(振荡压力烧结OPS,热压烧结HP)的显微结构、相变及力学性能的作用规律及机制。Raman分析表明:随着老化时间的延长,2种材料中单斜相氧化锆的含量缓慢增加,但OPS氧化锆在178、189 cm-1处的峰值强度显著低于HP氧化锆。水热老化导致氧化锆表面微裂纹、颗粒粗化等现象,当老化时间为18 h时OPS氧化锆和HP氧化锆的抗弯强度分别为1216和878 MPa。纳米压痕测试表明:OPS氧化锆的力学参数显著优于HP氧化锆。因此,OPS烧结技术有望极大拓展氧化锆陶瓷在生物医学领域的应用。

The use of zirconia ceramics in humid environments is limited by the phase transformation from the tetragonal phase to the monoclinic phase.In this study,an oscillatory pressure sintering(OPS)technique was developed for the preparation of zirconia ceramics that were characterized by high density,fine grain size and excellent mechanical properties.The hydrothermal aging behaviors of the oscillatory pressure sintered and hot-pressed zirconia were investigated.The Raman analysis showed strong peaks at 178 and 189 cm-1 in both the oscillatory pressure sintered and the hot-pressed specimens,but the peak intensities of the oscillatory pressure sintered specimen were much weaker than those of the hot-pressed specimen.When the specimens were aged for 18 h,the flexural strength of the oscillatory pressure sintered zirconia reached approximately 1216 MPa,which is much higher than that of the hot-pressed zirconia.Therefore,the OPS technique is promising for the preparation of zirconia ceramics that are used in the biomedical field.