原位氧化FeNiMnAlCrC高熵合金的光热转换性能  

Photothermal conversion performance of in situ oxidizing FeNiMnAlCrC high entropy alloy

作　　者：李雨洁 章飞 陈梅洁 李开洋 熊志平 宋旼[1] 王章维 LI Yujie;ZHANG Fei;CHEN Meijie;LI Kaiyang;XIONG Zhiping;SONG Min;WANG Zhangwei(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;School of Energy Science and Engineering,Central South University,Changsha 410083,China;School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China;National Key Laboratory of Science and Technology on Materials in Impact Environment,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]中南大学能源科学与工程学院,长沙410083 [3]华北电力大学能源动力与机械工程学院,北京102206 [4]北京理工大学冲击环境材料技术国家级重点实验室,北京100081

出　　处：《中国有色金属学报》2024年第11期3595-3607,共13页The Chinese Journal of Nonferrous Metals

基　　金：国家重点研发计划资助项目(2022YFE0134400);冲击环境材料技术国家重点实验室基金资助项目(6142902220101);中南大学研究生自主探索创新项目(2023ZZTS0273)。

摘　　要：本文采用经济的原位氧化和选择性刻蚀工艺,通过调控氧化温度和表面粗糙度,研究了Fe_(40)Ni_(11)Mn_(35)Al_(7)Cr_(6)C_(1)(摩尔分数,%)高熵合金表面的氧化产物变化及其对太阳能光热转换性能的影响。结果表明:在500~700℃范围内,随着温度升高和刻蚀引起的初始表面粗糙度的增大,氧化后高熵合金表面的氧化物尺寸、氧化层厚度、粗糙度和氧化物种类均呈上升趋势,使得光热转换性能逐渐提升。预先刻蚀并经700℃氧化2 h后,合金的太阳能吸收率和光热转换效率分别达到峰值90.4%和87.9%。当氧化温度继续升高至800℃后,由于热膨胀系数不匹配导致热应力增大,合金表面生成的氧化层均开始大面积脱落,进而导致材料的光热性能开始下降。本研究为金属氧化层的有效设计提供了理论支持,有助于实现高熵合金光热性能的优化与提升。In this paper,the variations in the oxidation products on the surface of a Fe_(40)Ni_(11)Mn_(35)Al_(7)Cr_(6)C_(1)(mole fraction,%)high entropy alloy and its effects on photothermal conversion performance were studied by adjusting oxidation temperature and surface roughness using economical in situ oxidation and selective etching techniques.The results show that,in the range of 500-700℃,as temperature and initial surface roughness increase,the oxide size,oxide thickness,roughness and oxide species on the alloy surface after oxidation exhibit an increasing trend,and the photothermal conversion performance gradually improves.After pre-etching and oxidation at 700℃for 2 h,the solar energy absorptance and photothermal conversion efficiency of the alloy reach the peak values of 90.4%and 87.9%,respectively.When the oxidation temperature continues to rise to 800℃,thermal stress that is increased due to the mismatch of thermal expansion coefficients,causes the oxide layer generated on the alloy’s surface before and after etching to begin flaking off extensively,leading to a decline in the photothermal conversion performance of materials.This study provides theoretical support for the effective design of metal oxide layers,and helps to optimize and improve the photothermal performance of high entropy alloys.

关 键 词：高熵合金 原位氧化 选择性刻蚀 光热转换 太阳能选择性吸收材料 

分 类 号：TG139[一般工业技术—材料科学与工程]