等离子喷涂钙镁铝硅酸盐陶瓷涂层制备及性能  

Fabrication and Properties of Plasma Sprayed Calcium Magnesium Aluminum Silicate Ceramic Coatings

作　　者：王志平 曹雨函 程涛涛 罗震[3] 刘为东 WANG Zhiping;CAO Yuhan;CHENG Taotao;LUO Zhen;LIU Weidong(Key Laboratory for Civil Aircraft Airworthiness and Maintenance,Civil Aviation University of China,Tianjin 300300,China;School of Mechanical Engineering,Hebei University of Technology,Tianjin 300401,China;School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]中国民航大学,天津市民用航空器适航与维修重点实验室,天津300300 [2]河北工业大学机械工程学院,天津300401 [3]天津大学材料科学与工程学院,天津300350

出　　处：《硅酸盐学报》2023年第11期2780-2791,共12页Journal of The Chinese Ceramic Society

基　　金：天津市教委自然科学研究项目(2020KJ030);天津市民用航空器适航与维修重点实验室开放基金项目“高熵氧化物陶瓷涂层制备及抗污损机理研究”;中国民航大学实验技术创新基金(2022CXJJ49)。

摘　　要：采用高温熔制法制备了1种CaO-MgO-Al_(2)O_(3)-SiO_(2)非晶陶瓷材料,利用高速破碎技术和等离子喷涂技术在45号钢基体上制备得到钙镁铝硅酸盐陶瓷涂层。对块状陶瓷和涂层的物相组成、显微硬度和微观形貌进行了分析,通过拉伸实验测试了涂层的结合强度。通过盐溶液浸泡腐蚀实验研究了涂层的耐腐蚀性能和腐蚀机理。结果表明:钙镁铝硅酸盐陶瓷涂层的孔隙率为7.93%±3.27%,无明显层状结构,涂层显微硬度值为6.63 GPa,与块体材料相比仅降低了3.89%,非孔隙区域具有类块体陶瓷材料的显微结构和力学性能;涂层结合强度为(16.25±2.11)MPa,断裂发生在涂层与金属过渡层的界面处,与等离子喷涂其它陶瓷涂层的结合性能相当;通过1000 h的浸泡腐蚀实验得到涂层试样的腐蚀速率为0.1026 g·m^(-2)·h^(-1),与基体试样相比降低了12.3倍,具有良好的耐腐蚀性能;分析腐蚀截面形貌发现,涂层的致密结构对腐蚀起机械隔绝作用,堆积在涂层孔隙与裂纹表面的腐蚀产物的溶解速率与腐蚀液渗至基体的速率达到平衡,减缓了腐蚀的发生。A CaO-MgO-Al_(2)O_(3)-SiO_(2) amorphous ceramic material was fabricated by a high-temperature melting method,and calcium magnesium aluminum silicate ceramic coating was prepared on 45#steel substrate via high-speed grinding and plasma spraying.The phase composition,microhardness,and microstructure of monolithic ceramics and coatings were analyzed,and the bonding strength of the coatings was tested through tensile experiments.The corrosion resistance and mechanism of the coating were investigated through salt solution immersion corrosion experiments.The results indicate that the porosity of the calcium magnesium aluminum silicate ceramic coating is 7.93%±3.27%,without an obvious layered structure.The microhardness value of the coating is 6.63 GPa,which is only 3.89%lower than that of monolithic materials.The non-porous area has the microstructure and mechanical properties of monolithic ceramic materials.The bonding strength of the coating is(16.25±2.11)MPa,and the fracture occurs at the interface between the coating and the metal transition layer,which is equivalent to the bonding performance of other plasma spraying ceramic coatings.The corrosion rate of the coated sample is 0.1026 g·m^(-2)·h^(-1),which is reduced by 12.3 times,compared to the substrate sample,indicating a good corrosion resistance through a 1000 h-immersion-corrosion-experiment.Based on the analysis of the corrosion cross-section,the dense structure of the coating plays a mechanical isolation role in corrosion.The dissolution rate of corrosion products accumulated on the pores and crack surfaces of the coating is balanced with the rate of corrosion liquid penetrating into the substrate,reducing the corrosion.

关 键 词：钙镁铝硅酸盐 非晶陶瓷涂层 等离子喷涂 耐腐蚀性能 类块体材料 

分 类 号：TQ174.75[化学工程—陶瓷工业]