钐铁合金熔体渗氮实验研究
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摘要
采用静置渗氮与底吹氮气渗氮两种工艺对钐铁熔体进行渗氮,通过XRD、SEM、EDS等手段分别研究渗氮合金样品的物相、形貌及成分,对比了两种工艺的渗氮效果。结果表明,钐铁合金熔体静置渗氮过程中,表面易形成高熔点难熔物质氧化钐,由于氧化钐覆盖在钐铁合金表面阻碍了N原子向熔体内部扩散,静置渗氮法未能达到理想的渗氮效果;底吹氮气渗氮试样的Sm_2Fe_(17)相中存在N元素,同时Sm_2Fe_(17)相主峰向小角度方向发生偏移,表明N原子进入Sm_2Fe_(17)相中,且渗氮效果良好。
The static nitriding and bottom-blown nitrogen nitriding processes of Sm-Fe melt were researched.The phase,morphology and composition of nitrided alloy samples were investigated through XRD,SEM and EDS,respectively.And the effects of the two nitriding processes were compared.The results show that during static nitriding of Sm-Fe alloy melt,the surface of the sample is easy to form high-melting-point refractory Sm_2O_3.Sm_2O_3 covers Sm-Fe alloy surface to hinder the diffusion of N atoms into the melt,and therefore the static nitriding method fails to achieve the desired nitriding effect.The nitrogen element is found in Sm_2Fe_(17) phase of the alloy sample after bottom-blown nitrogen nitriding,and the main peak of Sm_2Fe_(17) phase shifts to a smaller angle,indicating that N atoms enter Sm_2Fe_(17) phase and the nitriding effect is good.
The static nitriding and bottom-blown nitrogen nitriding processes of Sm-Fe melt were researched.The phase,morphology and composition of nitrided alloy samples were investigated through XRD,SEM and EDS,respectively.And the effects of the two nitriding processes were compared.The results show that during static nitriding of Sm-Fe alloy melt,the surface of the sample is easy to form high-melting-point refractory Sm_2O_3.Sm_2O_3 covers Sm-Fe alloy surface to hinder the diffusion of N atoms into the melt,and therefore the static nitriding method fails to achieve the desired nitriding effect.The nitrogen element is found in Sm_2Fe_(17) phase of the alloy sample after bottom-blown nitrogen nitriding,and the main peak of Sm_2Fe_(17) phase shifts to a smaller angle,indicating that N atoms enter Sm_2Fe_(17) phase and the nitriding effect is good.
引文
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[12]叶金文,刘颖,郑华雄,等.Sm2Fe17Nx的结构精修分析[J].稀有金属材料与工程,2011,40(6):1 015-1 018.
[2]罗晓宁,鄢春根,杨悦.稀土永磁材料专利信息分析[J].稀土,2015(2):113-118.
[3]宫清,张法亮,邓小霞,等.烧结钕铁硼磁体晶界扩散Dy/DyFe工艺研究[J].稀土,2015(4):120-126.
[4]KOU X C.Coercivity of SmFeN permanent magnets produced by various techniques[J].Journal of Alloys and Compounds,1998,281:41-45.
[5]KOBAYASHI K,IRIYAMA T,YAMAGUCHI T.Magnetic properties of the single magnetic domain particles of Sm2Fe17Nx compounds[J].Journal of Alloys Compounds,1993,193(1/2):235-238.
[6]DING J,MCCORMICK P G,STREET R.Structure and magnetic properties of mechanically alloyed SmxFe100-x nitride[J].Journal of Alloys Compounds,1992,189(1):83-86.
[7]王冰,范承恩.世界最强的最大磁能积的各向同性SmZr-Fe-N系粘结磁粉[J].国外金属热处理,2002,23(2):6-7.
[8]YANG Y C,ZHANG X D,GE S L.Magnetic and crystallographic properties of novel Fe-rich rare earth nitrides of the type RTiFe11 Nx[J].Journal of Applied Physics,1991,70(10):6 001-6 005.
[9]SZEKELY J,WANG H J,KAISER K M.Flow pattern velocity and turbulence energy measurement and prediction in a water model of and argon-stirred ladle[J].Metallurgical and Materials Transactions B,1976,7(2):287-295.
[10]SZEKELY J,LEHNER T,CHANG C W.Flow phenomena,mixing and mass transfer in argon-stirred ladles[J].Ironmaking&Steelmaking,1979,6(6):285-295.
[11]王书桓,袁亮亮,赵定国,等.Sm2Fe17型合金氮化工艺的研究进展[J].中国稀土学报,2017,35(3):318-319.
[12]叶金文,刘颖,郑华雄,等.Sm2Fe17Nx的结构精修分析[J].稀有金属材料与工程,2011,40(6):1 015-1 018.