作　　者： ; ; ;

机构地区： 华南理工大学机械与汽车工程学院

出　　处： 《材料工程》 2003年第5期33-36,共4页

摘　　要： 对等离子喷涂含Cr,Ni,W,Mo,C,Si等合金元素的Fe-B基非晶合金涂层进行了100～730℃不同温度4h热处理试验。差热分析结果表明,涂层的急剧结晶温度在590℃附近。热处理试验结果表明,在450℃以下热处理时,涂层仍基本保持非晶态,硬度变化不大。在450～610℃之间热处理时,随温度升高,涂层逐渐晶化,析出以Fe23(C,B)6和Fe23B6相为主的硬质相和富Fe相,在590℃左右获得晶粒尺寸约为20nm纳米晶组织,涂层硬度随温度升高急剧增大,在610℃左右硬度达到最大值,约1270HV。在630～730℃之间热处理时,富Fe相逐渐成为主要相,并有Fe23(C,B)6,Fe23B6,Fe3B和FeB等多种硬质硼化物相形成,晶粒尺寸随温度升高长大并形成树枝晶,涂层硬度逐渐降低。 A kind of FeB base amorphous alloy coating(contains Cr,Ni,W,Mo,C,Si) was fabricated by plasma spraying, and the coating was heattreated at different temperature(100~730℃) for 4h respectively The DSC test shows that the coating′s crystallizing temperature is about 590℃ The heat treatment results show that, when the heat treatment temperature is below 450℃,the coating is still amorphous structure, and the hardness changes a little When the heat treatment temperature is in the range of 450~610℃, the content of crystallizing phases increases gradually with the temperature improving, the crystallizing phases consist of Fe23(C,B)6, Fe23B6 and richFe phase, and the grain size of crystallizing phase is very small(that is about 20nm after 590℃4h heat treatment), so the hardness increases rapidly The hardness of the coating up to maximum value(about 1270HV) after 610℃4h heat treatment When the heat treatment temperature is in the range of 630~730℃,richFe phase becomes a primary microstructure,and the grain grows up to 5μm after 660℃4h heat treatment Although some Fe23(C,B)6,Fe23B6,Fe3B and FeB phase exist in the coating,the hardness decreases rapidly with the temperature increasing 

关 键 词： 等离子喷涂 非晶合金涂层 晶化

领　　域： [金属学及工艺] [金属学及工艺]