Determination of specific heat capacity and Curie temperature of NdFeB by differential scanning calorimetry
The specific heat capacity of NdFeB material was determined by differential scanning calorimetry(DSC)meth-od.The optimal test conditions were explored from the aspects of crucible selection,standard sample mass and sample weight.Meanwhile,the Curie temperature of NdFeB material was determined by the abnormal turning point of the specific heat capacity near the Curie temperature.The optimal testing conditions were obtained as below:the aluminum(Al)cruci-ble was selected;the mass of sapphire standard sample was 43.3 mg;the sample weight was about 43.3 mg.The results showed that the Curie temperature(Tc)of NdFeB material determined by DSC was consistent with that of typical NdFeB magnetic steel(310 ℃).The Curie temperature of NdFeB materials with different grades was in range of 290-330 ℃,and the Curie temperature of NdFeB magnetic material obtained by this method was in the range of 243-386 ℃ of the third gen-eration of rare earth permanent magnet materials R2Fe14B series compounds.
neodymium iron boronspecific heat capacityCurie temperaturesecond order phase transitiondifferential scanning calorimetry
万方数据
维普
