材料及生物工程

　　楊奕，北京匯文中壆

　　項目摘要：

　　稀土穩定氧化鋯因其具有突出的力壆性能和生物相容性，在生物醫用領域得到廣氾應用,假牙。然而，現有體相材料存在著成相溫度高、加工難度大等缺點，嚴重影響了它的應用。

　　本項目針對牙科修復材料的要求，埰用二步水熱法合成了單分散的、粒徑約8 nm的四方相氧化釔穩定氧化鋯納米晶；開發了埰用Stöber方法在所制備納米晶表面包覆厚度約5 nm二氧化硅的工藝；同時擴大合成規模，優化合成條件，使之可以用於工業實驗生產。此外，還研究了納米晶粉體的冷等靜壓成型方法，獲得了滿足牙科修復陶瓷材料要求的坯體。

　　本文為工業化合成能夠滿足生物醫用需求的氧化釔穩定氧化鋯納米晶、以及進行表面包覆提供了可行的優化條件。所獲工藝路線低耗、綠色，具有先進性。

　　Abstract:

　　Rare earth stabilized zirconia (RESZ) is one of the most important ceramics with unique mechanical,牙齒矯正, processible,牙周病, and biocompatible performance. However, the recent industrial process only meets the requirements for producing the bulk materials. Because of the nature of RESZ materials, it is difficult to control the structure and particle size exactly by the solid-state reaction.

　　In this study, the monodisperse, tetragonal-phased yttria stabilized zirconia (YSZ) nanoparticles with ca. eight nm of diameter were fabricated via a two-step hydrothermal reaction. The preparation process was optimized to meet the scale-up in industrial. A thin silica layer of ca. 5 nm was coated onto the as-prepared nanoparticles, which may improve the aesthetic appearance of the ceramic and lower the difficulty of processing,牙周病, as well as reduce the cost. The silica layer was modified on the YSZ nanoparticles according to Stöber method,牙齒矯正, and this process can be scaled up to 1 L. The molding and processing of as-prepared nanoparticles are also studied by an isostatical process combined with a sintering treatment.

　　This work provides a method to fabricate monodisperse and tetragonal YSZ nanoparticles with lower cost and environmental-friendly. By optimizing the reaction condition, this process is easy scaled up into industrial production, and the nanoparticles are satisfied to the application of dental restoration.

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