摘要
采用喷涂法在304不锈钢表面制备了Al2O3-SiO2-Na2O系热处理用高温防氧化涂层,并研究了其对304不锈钢高温氧化行为的影响。用TG-DTA和烧结点试验仪揭示了涂层的高温转变过程,采用扫描电镜和金相显微镜对原始涂层及氧化后试样进行了形貌表征。结果表明,涂层可极大提高不锈钢的收得率及表面质量;在1250℃空气中氧化9 h后,涂覆样的收得率为99.64%,空白样为85.74%;原始涂层在升温过程中逐渐熔融铺展,形成致密熔融膜,防氧化涂层有效地抑制了氧气向金属的扩散,防止了不锈钢的高温氧化。
An Al2O3-SiO2-Na2O based coating for heats treatment application was prepared on 304 stainless steel substrate by airspraying,and its effect on high temperature oxidation behavior of 304 stainless steel was investigated.TG-DTA and sintering point test were employed to examine the coating＇s thermal properties.SEM and optical microscope were used to characterize the as-received coating and cross section of the oxidized specimens.The results show that,when heating up,the coating melts down and transforms into a melting layer.Isothermal oxidation in air at 1250 ℃ for 9 h shows that,yield percentage of the coated and bare specimen was 99.64% and 85.74%.The coating effectively blocks off the invasion of oxygen and protects stainless steel from high temperature oxidation.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2010年第10期90-95,共6页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(50774073)
"十一五"国家科技支撑计划(2006BAC02A14)
中国科学院知识创新工程重要方向项目(KGCX2-YW-224)
关键词
不锈钢
熔融
高温防氧化涂层
热处理
stainless steel
high-temperature oxidation-resistant coating
heat treatment
