[通过等静压技术制备Al2O3/ZrO2复合牙科陶瓷]
[Preparing of Al2O3/ZrO2 composite dental ceramics through isostatic pressing technology].
作者信息
Liang Xiao-Feng, Yin Guang-Fu, Yang Shi-Yuan, Wang Jun-Xia
机构信息
School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 612010, China.
出版信息
Hua Xi Kou Qiang Yi Xue Za Zhi. 2006 Aug;24(4):303-5.
OBJECTIVE
To find out how to prepare high-density dental ceramics through isostatic pressing so that sintering shrinkage will be reduced.
METHODS
To prepare Al2O3/ZrO2 composite powder first, then to mold through dry-pressing, and to shape the green-body through isostatic pressing. The green-bodies were sintered at the temperature of 1 400 degrees C and kept at the temperature for different period of time (2 h, 3 h, 4 h). After that, the density and fracture strength were measured and the microstructure observed by scanning electron microscope (SEM).
RESULTS
The sample product's density, line-shrinkage, and fracture strength of ceramics was rising with the sintering time lengthened. The sample product kept under the temperature of 1 400 degrees C for 4 hours, the fracture strength was (497.27 +/- 78.45) MPa and glass phase distributed evenly in the ceramics and the grains were integrated owing to the glass phase. The longer the sintering time, the more even the microstructure was.
CONCLUSION
The sintering quality and the efficiency were improved through isostatic pressing.
目的
探究如何通过等静压制备高密度牙科陶瓷，以降低烧结收缩率。
方法
先制备Al2O3/ZrO2复合粉末，然后通过干压成型，再经等静压使坯体成型。将坯体在1400℃温度下烧结，并在该温度下保持不同时间（2小时、3小时、4小时）。之后，测量密度和断裂强度，并用扫描电子显微镜（SEM）观察微观结构。
结果
随着烧结时间延长，陶瓷样品产品的密度、线收缩率和断裂强度均上升。样品在1400℃温度下保持4小时，断裂强度为（497.27±78.45）MPa，玻璃相在陶瓷中分布均匀，且由于玻璃相的作用，晶粒结合完整。烧结时间越长，微观结构越均匀。
结论
通过等静压提高了烧结质量和效率。
Zotero 插件