本文目的為使用氧化鋯粉末製作高強度快速原型陶瓷工件。若要得到高強度或高緻密度工件必須使用分散性良好的漿料進行鋪層。本文藉由不同分散劑含量及 pH 值探討漿料的分散性質。結果顯示,0.2μm釔安定氧化鋯漿料分散劑含量 0.75wt%具有最低黏度、pH 值調整到 10有較大的電位值。 分散後的氧化鋯漿料,以快速原型技術製作生坯試塊,試塊燒結前後緻密度分別為 46.31 % 與 99.46 %; X 軸線平均收縮率 24.38%、標準差 0.057%,Y軸線平均收縮率 24.36%、標準差 0.078%。生坯平均強度19.14Mpa,經過燒結之平均強度達到 923.2Mpa,比氧化鋁為基材所製作的工件強度要高出許多。 本研究使用陶瓷粉末調配成漿料,經鋪層、乾燥後,以雷射掃描方式製作工件,再以超音波震盪清料後成功地從生坯塊中取出陶瓷扳手與金字塔工件。
The purpose of this paper is to use zirconia powder to produced high strength rapid prototyping ceramic workpiece. To obtain high strength or high density workpiece, layer should be casted with well-dispersed slurry. Current study investigated the dispersion characteristic of the slurry by varying the dispersant content and pH value. The results showed that the lowest viscosity of the slurry could be achieved when the dispersant in the slurry was made up with 0.2μm yttrium-zirconium and pH value was adjusted to 10 to obtain a higher zeta-potential. The dispersed zirconia slurry was employed to manufacture the green spiecemens by rapid prototyping technology. The densities of the specimens were 46.31% and 99.46% before and after sintering respectively. The average shrinkage of X-axis was 24.38%, and standard deviation was 0.057%. The average shrinkage of Y-axis was 24.36%, and standard deviation was 0.078%. The average bending strength of the green specimens were 19.14Mpa but increased to 923.2Mpa after sintering. It was much higher than that of alumina specimens. In this study, the slurry was made up with ceramic powder. After paving and drying, laser scanned for fabrication of the workpiece. After removing the material which surrounded the green workpiece by using of ultrasonic, a ceramic spanner and a pyramid workpiece were taken out from the green block.