烧结温度对Fe-Ni-Mo磁温度补偿合金热磁性能的影响

Effects of sintering temperature on pyromagnetic performance of Fe-Ni-Mo temperature compensation calmalloy

采用粉末冶金法制备Fe-Ni-Mo磁温度补偿合金,研究了烧结温度对试样相结构和热磁性能的影响。对不同烧结温度试样X射线衍射(XRD)分析发现:1100℃与1150℃烧结产物均为γ(Fe,Ni)与体心立方Mo;1200℃为γ(Fe,Ni)、α(Fe,Ni)与体心立方Mo;1250℃烧结产物分别为γ(Fe,Ni)、α(Fe,Ni)、体心立方Mo与面心立方Mo四相;1300℃烧结产物为γ(Fe,Ni)、α(Fe,Ni)与面心立方Mo。从衍射峰相对强度变化可知:烧结产物α(Fe,Ni)含量随烧结温度先增后减,1250℃烧结α(Fe,Ni)含量最高。通过磁性测量与电镜分析可知,粉末冶金法制备磁温度补偿合金的关键是烧结温度。通过粉末冶金法与铸造法制得的试样热磁性能对比可知:粉末冶金法试样的热磁性略低于铸造试样的,但其热磁性能的稳定性得到很大提高。

Fe-Ni-Mo temperature compensation magnetic alloy was fabricated by powder metallurgy. The effects of sintering process on the construction of phases and thermal magnetic performance of the materials were investigated. X-ray diffraction （XRD） had been employed to follow the structural evolution during the sintering process. It is observed that when sintering at 1100℃ and 1150℃ ,the sintered product consits of 7（Fe, Ni） and bee Mo; when sintering at 1200℃ it consits of 7（Fe, Ni） α（Fe, Ni） and bee Mo; when at 1250℃ sintered product consts of 7 （Fe, Ni）,α（Fe, Ni）,bcc Mo and fee Mo. The study on relative intensity of X-ray diffraction peak indicates that with sintering temperature increasing, the sintered product α （Fe, Ni） increase first and then decrease, which achieve the maximum at 1250℃ . By magnetic measurements and observation of electrical microscopy, it is found that the sintering temperature is the key of fabricating temperature compensation magnetic alloy. It is found that the thermal magnetic performance of samples fabricated by PM is slightly lower but much stabler than that of products fabricated by casting.