普碳钢用陶瓷基高温防护涂层制备及其性能表征  

Preparation and Characterization of High Temperature Protective Ceramic Coating for Plain Carbon Steel

作　　者：周旬[1,2] 魏连启[1] 刘朋[1,2] 王晓婧[1,2] 叶树峰[1] 陈运法[1] 

机构地区：[1]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《过程工程学报》2010年第1期167-172,共6页The Chinese Journal of Process Engineering

基　　金：国家科技部重大科技支撑项目基金资助(编号:2006BAC02A14);国家自然科学基金资助项目(编号:50774073);中国科学院知识创新工程重要方向基金资助项目(编号:KGCX2-yw-224)

摘　　要：采用机械混合法制备了一种针对碳钢的新型Al2O3-MgO-TiO2-CaO体系陶瓷基高温防护涂料,1300℃下可在Q235B钢表面形成致密保护层,提高钢抗氧化烧损性能.结果表明,在涂料粒度48～75μm、涂层厚度0.5mm的条件下,涂层防护性能优良.涂层的防护温度范围为900～1300℃,1300℃时比原样可降低氧化烧损59.36%,防护寿命长于8h.涂层的应用将氧化层由经典的Fe2O3/Fe3O4/FeO三层结构转变为一层尖晶石结构,同时减薄了氧化层厚度,显著降低了Fe元素的高温扩散速率.A new high temperature protective ceramic coating used on the surface of plain steel was prepared by mechanical mixing method. The coating was consisted of magnesia, titania, alumina and calcium oxide mixture. Such a coating, when it was applied superficially on Q235B plain steel surface, could form a compact scale and enhance oxidation resistance at 1300 ℃. The experimental result showed that the granularity between 48-75 μm and coating layer thickness of 0.5 mm were needed to observe the coating performance. The coating could work effectively in the temperature range of 900-1300 ℃. Metal loss was diminished by 59.36% compared with the uncoated sample at 1300 ℃. Duration of the coating could last over 8 h. The ceramic coating converted the scale structure from classic Fe2O3/Fe3O4/FeO three layers to one spinel layer, suppressed the growth of iron oxides and decreased Fe diffusion speed sharply at elevated temperature.

关 键 词：陶瓷涂层 Q235B钢 高温防护 

分 类 号：TG174.45[金属学及工艺—金属表面处理]