(1. 江西科技師范大學(xué) 江西省材料表面工程重點實驗室，南昌 330013；
2. 中國科學(xué)院固體物理研究所，合肥 230031)
摘 要: 研究了高鉻含量的Fe-20Cr、Fe-30Cr和Fe-40Cr三種合金在800 ℃，空氣中的循環(huán)氧化行為和0.1？MPa純氧氣中的恒溫氧化行為。三種合金在循環(huán)氧化條件下的氧化動力學(xué)均不規(guī)則，隨著Cr含量的增加，其抗氧化性能逐漸增強(qiáng)。24 h氧化后，F(xiàn)e-20Cr單位面積增質(zhì)最大，其值為2. 21×10-2 mg/(cm2·h)，F(xiàn)e-40Cr單位面積增質(zhì)最小，其值為1. 45×10-2？ mg/(cm2·h)。結(jié)果表明：三種合金的恒溫氧化動力學(xué)曲線均可分為暫態(tài)氧化和穩(wěn)態(tài)氧化兩個階段，每個階段都能較好地符合拋物線規(guī)律。總體上來說，恒溫條件下三種合金都具有優(yōu)異的抗高溫氧化性能，其24 h單位面積氧化增質(zhì)比循環(huán)氧化下降了將近一個數(shù)量級。但隨著Cr含量的增加，三種合金抗氧化性能逐漸下降，F(xiàn)e-20Cr反而具有最佳的抗氧化性能。在循環(huán)和恒溫氧化條件下，三種Fe-Cr合金均生成了單一的保護(hù)性Cr2O3外氧化膜。
關(guān)鍵字: Fe-Cr；高溫氧化；高鉻含量
（1. Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China;
2. Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China）
Abstract:The cyclic oxidation in air and isothermal oxidation in 0.1？MPa pure oxygen at 800 ℃ for Fe-20Cr, Fe-30Cr and Fe-40Cr alloys with a high Cr content were investigated. The results show that the three alloys exhibit irregular oxidation kinetics under the cyclic oxidation condition. With the increase of Cr content, the oxidation resistance of the alloy is improved. After 24 h oxidation, Fe-20Cr obtains the highest mass gain per unit area with the value of 2.21×10-2 mg/(cm2·h), while Fe-40Cr obtains the lowest value of 1.45×10-2？ mg/(cm2·h). The isothermal oxidation kinetics of the three alloys can be divided into two stages as transient and steady oxidation. At each stage the kinetics obeys the parabolic law quite well. On the whole, the three alloys show excellent oxidation resistance. Compared with the case of cyclic oxidation, the mass gain per unit area after 24 h oxidation of the three alloys decreases by almost an order of magnitude. On the contrary, with the increase of Cr content, the oxidation resistance of the three alloys decreases gradually and Fe-20Cr presents the best performance. Under all conditions, an exclusive and protective Cr2O3 layer forms on the surfaces of the three Fe-Cr alloys.
Key words: Fe-Cr; high temperature oxidation; high Cr content
