利用拟薄水铝石的凝胶作用,以浓 HNO3为引发剂,将 Al2 O3(1μm)粉末和含3% Y2 O3的 ZrO2(200 nm)粉末均匀填充在拟薄水铝石的溶胶双电层内,在一定温度和时间下胶凝固化并干燥成坯。将生坯通过不同的温度烧结后,制备出 ZTA 陶瓷正畸托槽材料。主要研究拟薄水铝石的胶体行为、不同固含量下生坯的性能以及 ZrO2对陶瓷晶粒结构和力学性能的影响。结果表明,经拟薄水铝石凝胶制备的陶瓷生坯具有一定抗弯强度(达4 MPa),可用于力学加工。在该制备方法中,ZrO2可更好地发挥增韧作用,增加陶瓷烧结后致密度,提高陶瓷托槽材料的抗弯强度。
Al2 O3 (1 μm)powder and ZrO2 (200 nm)contain 3% Y2 O3 powder evenly were filled in the electrical double layer by pseudo-boehmite gel method with HNO3 as a initiator.The green body was obtained after gelling and drying under special temperature and time.ZTA ceramic bracket material was formed through different sintering tem-perature.The colloidal behavior of boehmite,the mechanical properties of the green bodies with different solid content and the influence of ZrO2 on grain structure and mechanical properties of the ceramic materials were studied.The re-sults showed that the bending strength of green bodies was 4 MPa,which could be used in the mechanical processing. In this process,ZrO2 is a better toughening agent for the ceramics sample,which increased the density and the ben-ding strength of the sintered ceramic bracket materials.
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