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Cr2O3掺杂对17Ni/(10NiO-NiFe2O4)金属陶瓷的致密化及抗熔盐腐蚀性能的影响

刘槟赫，林启权*，刘建鹏，周 行
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2017年 第36卷 第4期: 1000-6281（2017）04-0342-09     下载地址：

Cr2O3掺杂对17Ni/(10NiO-NiFe2O4)金属陶瓷的致密化及抗熔盐腐蚀性能的影响

刘槟赫，林启权*，刘建鹏，周 行

(湘潭大学机械工程学院，湖南 湘潭 411105)

摘  要  采用常规冷压烧结技术制备Cr2O3掺杂17Ni/(10NiO-NiFe2O4)金属陶瓷试样，并研究Cr2O3不同掺杂量对金属陶瓷材料物相组成、显微组织、烧结致密化和电解温度（960℃）下的抗熔盐腐蚀性能的影响。结果表明：Cr2O3掺杂后固溶在陶瓷基体相NiFe2O4晶格内，导致晶格发生畸变，促进了烧结致密化。随着Cr2O3掺杂量逐步加大，试样的致密度也逐步提高，当Cr2O3掺杂量达到4%时，致密度高达99%，比未掺杂Cr2O3的试样提高了4.98%。同时发现掺杂适量的Cr2O3能够明显改善17Ni/(NiFe2O4-10NiO)金属陶瓷抗熔盐腐蚀性能，当Cr2O3的掺杂量为2%时，试样在熔盐腐蚀中更易生成致密的腐蚀反应层，抗熔盐腐蚀性能最优异，熔盐腐蚀率最低，为1.7736×10-3g﹒cm-2﹒h-1，约为未掺杂Cr2O3的1/3。

关键词  10NiO-NiFe2O4 基金属陶瓷；Cr2O3；致密度；抗熔盐腐蚀性能

中图分类号：TF125；TG148；TG115.21+5.3     文献标识码：A   doi:10.3969/j.issn.1000-6281.2017.04.007

 

Effect of Cr2O3 doping on densification and the corrosion resistance  to molten salt of 17Ni/(10NiO-NiFe2O4) cermets

LIU Bin-he，LIN Qi-quan*，LIU Jian-peng，ZHOU Hang

（School of Mechanical Engineering，Xiangtan University，Xiangtan Hunan411105，China )

Abstract  Cr2O3 doped 17Ni/(10NiO-NiFe2O4)  cermet inert anodes were prepared by a cold isostatic pressing-sintering process.The effects of Cr2O3 doping with different content on the phase composition, microstructure, the sintering densificationand the corrosion resistance in the electrolysis temperaturewere investigated by means of XRD, SEM. The results show that doped Cr2O3 is solid soluted into the phase NiFe2O4 lattice of the ceramic matrix after doping, producing the lattice distortion and thus promoting the sintering densification. With the increase of the content Cr2O3, the relative density of the sample also increases gradually. When the content of Cr2O3 is 4%，the relative density of the cermet is 99%，which is 4.89% higher than that of undoped one. At the same time，Cr2O3 doping can obviously improve the corrosion resistance of 17Ni/(10NiO-NiFe2O4) cermet. When the content of Cr2O3 is 2%，a dense layer of corrosion reaction is easily formed in the cermet and the corrosion resistance is the best in the molten salt with the molten salt corrosion rate as low as 1.7736×10-3g﹒cm-2﹒h-1，about 1/3 of the one without additives.

Keywords 10NiO-NiFe2O4 based cermets；Cr2O3；relative density；corrosion resistance to molten salt

 

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