压电陶瓷表面硅钙复合膜的制备与表征

采用溶胶-凝胶法制备了硅钙复合溶胶,并在压电陶瓷表面制备硅钙复合膜,以改善水泥基压电陶瓷复合材料界面。确定了溶胶配比,研究了陈化、低温热处理和硅烷偶联剂对覆硅钙复合膜压电陶瓷接触角、压电和介电性能的影响。结果表明,硅钙复合溶胶中Ca与Si摩尔比>0.2时不利于成膜;提高陈化温度和延长陈化时间可明显减小硅钙复合膜的接触角;硅钙复合膜层数最佳为3层,烧结温度不大于160℃;加入微量硅烷偶联剂可有效改善膜层开裂。制备的硅钙复合膜接触角最小为27°,亲水性好。

Preparation and characterization of silicon-calcium composite film on piezoelectric ceramic surface

The silica-calcium composite sol was prepared by sol-gel method, and silica-calcium composite film was prepared on the surface of piezoelectric ceramics to improve the interface of cement-based piezoelectric ceramic composites. The sol ratio was determined, and the effects of aging, low temperature heat treatment and silane coupling agent on the contact angle, piezoelectricity and dielectric properties of piezoelectric ceramics with silica-calcium composite film were investigated. The results show that the molar ratio of Ca to Si greater than 0.2 in silica-calcium composite sol is not conducive to film formation; increasing the aging temperature and prolong the aging time can significantly reduce the contact angle; the optimal number of layers of silica-calcium composite film is 3, and sintering temperature is not more than 160℃; the addition of a trace amount of a silane coupling agent can effectively improve the cracking of the film layer. The prepared silica-calcium film has a minimum contact angle of 27° and good hydrophilicity.