氧化锆增韧的纳米复合渗透陶瓷(Al_2O_3-nZrO_2)粉体合成的研究

Study of Processing of Zirconia Toughened Glass Infiltrated Nanometer-ceramic Composite Powder(Al_2O_3-nZrO_2)

目的 研究Al2 O3 -nZrO2 纳米复合陶瓷粉体的合成。方法 采用包裹共沉淀与湿法球磨相结合的方法合成Al2 O3 -nZrO2 纳米复合陶瓷粉体。结果 ①采用观察沉降情况与沉降物体积的方法来评价分散效果 ,粉体分散系沉降过程极慢 ,观察 2 4h后悬浮液的颗粒仍由上而下呈逐渐增浓的弥散分布 ,最后即使经高速离心所得到的沉积物体积亦较小。②SEM观察粉体颗粒分散较好 ,超细颗粒粒径为纳米级。③衍射图剖析结果经稳定剂处理后 ,粉体晶相由单斜相和四方相共同构成 ,即成为有增韧作用的部分稳定ZrO2 粉体。结论 所合成Al2 O3 -nZrO2 粉体的分散效果。

Objective To investigate processing of Zirconia Toughened Glass Infiltrated Nanometer-ceramic Composite (Al 2O 3/nZrO 2). Methods Processing the Zirconia Toughened Glass Infiltrated Nanometer-ceramic Composite(Al 2O 3/nZrO 2) Powder with combination of chemical co-precipitation method and Ball milling .Those two methods were used to reduce agglomeration of micrometer sized α- Al 2O 3 grains coated by the nanoneter sized particles and eliminate the agglomeration of ultrafine zirconia particles respectively. Results ①The studied nanometer ceramic composite powder can be shown to dispersed well in processing system by Gravity Sedimentation Test and SEM observation .②The studied nanometer ceramic composite powder is consisted ofα-Al 2O 3?t-ZrO 2 and m-ZrO 2. Conclusion The studied nanometer ceramic composite powder owns good homogeneity,excellent fluidity and operating ability.