第27卷第6期粉末冶金材料科学与工程2022年12月Vol.27No.6MaterialsScienceandEngineeringofPowderMetallurgyDec.2022DOI:10.19976/j.cnki.43-1448/TF.2022045PMMA表面包覆LaNi5合金粉末的储氢性能李珂，高云鹤，黄通文，周承商(中南大学粉末冶金国家重点实验室，长沙410083)摘要：LaNi5储氢合金粉末易氧化，严重影响其储氢性能。本文采用溶液浸渍法将聚甲基丙烯酸甲酯(polymethylmethacrylate,PMMA)对LaNi5合金粉末进行表面包覆改性，研究粉末的微观形貌、储氢性能和抗氧化性能。结果表明，空气氧化后，PMMA包覆LaNi5合金的储氢量保持在1.29%(质量分数)，而LaNi5合金的储氢量仅为1.15%。对比未包覆的LaNi5合金，PMMA包覆LaNi5合金在空气氧化后仍保持较好的吸放氢动力学性能和储氢量，且具备良好的循环稳定性。因此，PMMA包覆LaNi5合金可减缓合金在空气中的氧化反应，改善合金的抗氧化性能，有利于合金的应用和储氢安全性。关键词：LaNi5合金；抗氧化性能；PMMA；包覆；合金粉末中图分类号：TG139.7文献标志码：A文章编号：1673-0224(2022)06-595-06HydrogenstoragepropertiesofPMMA-coatedLaNi5alloypowdersLIKe,GAOYunhe,HUANGTongwen,ZHOUChengshang(StateKeyLaboratoryofPowderMetallurgy,CentralSouthUniversity,Changsha410083,China)Abstract:LaNi5hydrogenstoragealloypowdersareeasytobeoxidized,seriouslyaffectingthehydrogenstoragepropertiesofLaNi5alloy.Inthispaper,PMMA(polymethylmethacrylate)wasusedtomodifythesurfaceofLaNi5alloybythesolutionimpregnationmethod.Themicrmorphology,hydrogenstorageproperties,andoxidationresistanceofLaNi5alloywereinvestigated.Theresultsshowthatthehydrogenstoragecapacityofair-oxidatedPMMA-coatedLaNi5alloyafteroxidationismaintainedat1.29%,whilethatofLaNi5alloydecreasesto1.15%(massfraction,%,thesamebelow).ComparedwiththeuncoatedLaNi5alloy,thedehydrogenationandhydrogenationkineticandhydrogenstoragecapacityofPMMA-coatedLaNi5alloyafterair-exposurearewellmaintained,andthePMMA-coatedLaNi5alloypossessesgoodcyclingstability.Therefore,PMMA-coatedLaNi5alloycanmitigatetheoxidationreactionofthealloyandimprovetheoxidationresistanceofthealloy.Itisbeneficialforalloyapplicationsandhydrogenstoragesafety.Keywords:LaNi5alloy;oxidationresistance;PMMA...
