镍表面制备Pb-Si-Mg-Ti-O系陶瓷涂层及其高温绝缘性研究

Preparation of Pb-Si-Mg-Ti-O Ceramic Coating on Nickel Surface and Its High Temperature Insulation

以改性的铅玻璃粉、滑石粉、蒙脱土等为溶质,钛酸丁酯、二甲苯为溶剂,制备高粘度陶瓷浆料。通过浸渍提拉-低温烧结在镍表面快速制备Pb-Si-Mg-Ti-O系陶瓷涂层。研究了较高温度时陶瓷涂层的绝缘性;通过划痕法测试其与镍基底的附着力;采用FE-SEM研究了该涂层的微观形貌及涂层厚度等。结果表明:当固含量为25%时,涂层较薄且连续性较差;当固含量为35%时,涂层微观结构均匀,附着性良好,陶瓷涂层厚度约15.5μm;当固含量增加到45%时,涂层厚度增加,涂层局部出现明显熔融玻璃态。Pb-Si-Mg-Ti-O系涂层与镍基体的结合良好,当温度低于350℃时,固含量为35%的陶瓷涂层能保持良好的绝缘性能,并具备较好的随镍片变形的可挠曲性。

Taking modified lead glass powder,talcum powder,montmorillonite as solute,and butyl titanate and xylene as solvent,the ceramic coating with high viscosity was prepared.Pb-Si-Mg-Ti-O series ceramic coating was rapidly prepared on nickel surface by dip-coating and low-temperature sintering.The insulation of ceramic coatings at higher temperature was investigated.The adhesion between ceramic coating and nickel was measured by scratching method.The microstructure and thickness of the coating were researched by FE-SEM.The results show that when the solid content is 25%,the coating is thin and the continuity is poor.When the solid content is 35%,the microstructure of the coating is uniform and the adhesion is well,and the thickness of the ceramic coating is about 15.5μm.As the solid content is up to 45%,the thickness of the coating increases,and the coating partially shows a clear molten glass state.The Pb-Si-Mg-Ti-O coating has good bonding with the nickel substrate.When the temperature is lower than 350℃,the ceramic coating with a solid content of 35%could maintain good insulation properties and has good flexibility with the deformation of nickel sheet.