Fabrication of Multi-Functional Ceramic Composites by Slurry Stacking Method

本文介绍了一种用于陶瓷/金属混合粉末精细堆积的计算机控制粉末喷雾堆积装置。将不同配比的金属粉末和陶瓷粉末均匀混合在以乙醇为溶剂的悬浮液中，然后通过计算机控制喷涂到预热的连续梯度基体上，再通过热等静压工艺成功地制备出了由陶瓷到金属连续过渡的功能梯度材料。然后将沉积的粉末压块冷等静压、玻璃封装和热等静压。显微组织观察表明，该工艺可精确控制各种成分分布，最小控制尺寸为0.01mm厚。结果表明，采用本工艺制备的金属/陶瓷梯度功能材料比氧化锆陶瓷具有更高的抗断裂性能和抗热震性能。

A powder spray stacking apparatus with a computer-controlling system has been developed for fine stacking of mixed ceramic/metal powders. Functionally gradient materials with a continuous microstructural transition from ceramics to metals have been successfully fabricated using this process followed by hot-isostatic pressing.In the present process, metal and ceramic powders with different mixing ratios were mixed homogeneously in the suspension using ethanol as a solvent, and were sprayd onto a preheated substrate with continuously graded composition by the computer control. The deposited powder compacts were then cold-isostatically pressed, glass-encapsulated and hot-isostatically pressed. The microstructural observation showed that this process could precisely control the various composition profile with the minimum control size of 0.01mm in thickness. It has been shown that the metal/ceramic functionally gradient materials fabricated by the present process have larger fracture resistance and thermal shock resistance than the monolithic Zirconia ceramics.