工艺因素对纳米四方多晶氧化锆浆料固化的影响

Influence of Process Factors on Polymerizing Behaviors of Nano-sized Tetragonal Polycrystals Zirconia Slurries

摘要:

水基凝胶流延成型工艺是1种薄片式材料制备新技术，主要是利用陶瓷浆料中有机单体聚合反应形成三维空间的网络结构，将陶瓷颗粒填充于网络骨架中形成具有较高强度的结构均匀的陶瓷坯体。主要研究四方多晶氧化锆薄膜制备过程中，有机单体溶液浓度和pH值对纳米四方多晶氧化锆浆料固化反应的影响。结果表明：随浆料中有机单体浓度的增加，浆料聚合反应速率显著提高，为保证合适的固化时间，有机单体浓度可控制存10％～40％(质量分数)范围内；浆料的PH值对聚合反应速率有显著的影响，随PH值的增大，聚合反应速率降低，合适的pH值范围为9～10；在高于35℃温度范围内，聚合反应速率变化显著，适当的成型温度范围为35℃～45℃；引发剂和催化剂用量增加，反应速率大大提高，为获得较好的成型性能，浆料的引发剂用量应控制在0．15％～0.30％(体积分数，下同)的范围内，催化剂用量在0．20％左右为宜。

Abstract:

The aqueous-gel-tape-casting process is a novel technique fabricating flat ceramic materials. Employing the mechanism of three dimensions net structure formed by polymerized organic monomers, the high strength green bodies are formed by the net structure and ceramics particle filling in it. In the present work the influence of the organic monomer concentration and pH value and the polymerizing temperature and the concentration of initiator and catalyst on polymerization of the nanosized 3Y-TZP slurries during the aqueous-gel-tape-casting process was investigated. The results show that the polymerizing rate of the organic monomers increases greatly with the increase of the concentration of organic monomer in slurries. To ensure the proper polymerizing time, the concentration of the organic monomer solution must be controlled in the range of 10wt%~40wt%. The polymerizing rate of the organic monomers changes evidently with the different pH values. The higher the pH value, the lower the polymerization rate. The proper pH value is between 9~10. The polymerizing rate of the organic monomers increases with the increase of the temperature. Exceeding 35oC the polymerizing rate of the organic monomers changes greatly. The proper polymerizing temperature is from 35oC to 45 oC. The polymerizing rate of the organic monomers increases evidently with the increase of the concentration of the initiator and the catalyst. For perfect forming properties the concentration of initiator should be controlled in the range of 10wt% to 40wt%, the concentration of catalyst is about 0.20vol %.