摘要
利用失重法对316L奥氏体不锈钢纤维的高温氧化动力学进行了研究,通过对氧化动力学曲线的分析可以得出:700℃时因氧化反应动力学曲线一直呈上升趋势,直至120h后曲线开始平缓;900～1000℃时氧化到一定阶段后,因氧化物(MoO3、Cr2O3等)的挥发均呈现一个下降趋势,之后氧化达到饱和状态基本不再变化;且达到饱和的时间随温度升高而减少。扫描电镜对高温氧化后的形貌观察发现700℃时碳化物(Cr23C6)大量析出,900℃下氧化后纤维表面呈密集颗粒状,温度再升高至1000℃后,由于颗粒周围基体的氧化和氧化物的挥发,颗粒掉落严重。
High-temperature oxidative dynamics of 316 L austenitic stainless steel was studied using weight loss testing method. Ascending trend of dynamic curve at 700 ℃ was analyzed, after 120 h turned into slow oxidative stage. Downtrend happened during 900-1 000 ℃ becanse of volatilization of oxide （MoO3,Cr2O3,then reach saturation state and no more alteration. Saturated time cut down along with temperature hoisting. Morphology of high-temperature oxidation was observed with scanning electron microscope. Largescale carbonizationin （Cr23C6） separated at 700 ℃ .Mass granulate precipitates were discovered at 900 ℃.Temperature-rise to 1 000 ℃,grain dropped badly, as a result of oxidation and volatilization around grain.
出处
《河北化工》
2008年第2期24-26,共3页
Hebei Chemical Industry
关键词
不锈钢纤维
高温氧化
动力学曲线
形貌
stainless fibre
high-temperature oxidation
dynamic curve
morphology
