胶粘陶瓷涂层中氧化锌含量对涂层显微组织的影响

Effect of Zinc Oxide on Microstructure of Ceramic Adhesive Coating of Plain Carbon Steel

用高温胶粘剂制备胶粘陶瓷涂层施工简易,但制备温度过高时涂层易起泡开裂;纳米氧化锌可与磷酸二氢铝胶粘剂迅速反应以降低涂层制备温度。以磷酸二氢铝为胶粘剂,氧化铝、氧化锆和硅酸锆为陶瓷骨料,高铝水泥为固化剂,氧化铬为消泡剂,纳米氧化锌为表面调和剂,在45钢表面制备了胶粘陶瓷涂层。采用光学显微镜观察了不同氧化锌含量的陶瓷涂层表面的裂纹长度和深度,并基于液滴观测法,研究了不同氧化锌含量的陶瓷涂层的孔隙率。结果表明:随氧化锌含量的增加,胶粘陶瓷涂层表面裂纹的长度和深度先增加后减少,气孔率逐步减少;当氧化锌含量为1.6 g时,获得了致密、无开裂、无气孔的陶瓷涂层。

Ceramic adhesive coatings were prepared on the surface of plain carbon steel (45 steel) with aluminum dihydrogen phosphate as binder,Al 2 O 3 ,ZrO2 and ZrSiO 4 as ceramic powders,high alumina cement as curing agent,and ZnO as surface modulating agent. The length and depth of the cracks on the surfaces of as-prepared ceramic adhesive coatings with different content of nanoscale ZnO were observed with an optical microscope,and the porosity of as prepared coatings was determined by water droplet diffusion method. Results showed that the length and depth of the cracks on the surfaces of as-prepared ceramic adhesive coatings initially rose but declined later with increasing content of nanoscale ZnO,and the porosity of the coatings gradually declined therewith. Particularly,as-prepared ceramic adhesive coating containing 1. 6 g nanoscale ZnO was compact and free of cracks and pores.