Submicron Al₂O₃ powders were activated by Diffuse Coplanar Surface Barrier Discharge (DCSBD) plasma. The influence of the plasma treatment on the powder properties and their impact on the microstructure of dry and wet shaped ceramics were investigated. Raman and FTIR analyses of treated powders showed a substantial increase of the powder’s surface hydroxylation, surface cleaning, and the presence of adsorbed NO_x originating from the DCSBD. Sintering of the dry shaped plasma treated powders did not influence sintering behavior. On the other hand, the plasma treated powder was able to form stable water suspension without any chemical stabilization aid. Slip cast samples exhibited finer pore size distribution, a higher sinterability, and a finer final microstructure. The grain size of slip casted plasma treated powder was reduced by a factor of 1.7, which facilitated a grain size of 0.68 μm at the relative density of 99.54% t.d. obtained by pressure-less sintering.

亚微米Al ₂ O ₃粉末通过扩散共面表面势垒放电（DCSBD）等离子体活化。研究了等离子处理对粉末性能的影响及其对干，湿形陶瓷微观结构的影响。拉曼和FTIR处理粉体的分析表明该粉末的表面羟基化的大幅增加，表面清洁，并吸附NO的存在_X源于DCSBD。干燥成型的等离子体处理过的粉末的烧结不影响烧结行为。另一方面，经等离子体处理的粉末能够在没有任何化学稳定助剂的情况下形成稳定的水悬浮液。滑模铸造样品表现出更细的孔径分布，更高的烧结性和更精细的最终微观结构。滑模等离子体处理过的粉末的晶粒尺寸减小了1.7倍，这在通过无压烧结获得的相对密度为99.54％td的情况下促进了0.68μm的晶粒尺寸。