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从坩埚选择、试样称取量、升温速率等方面摸索了差示扫描量热法(DSC)测试非晶材料Fe78Si9B13居里温度的最佳试验条件,分析了不同升温速率对测试结果的影响,同时与该材料晶化温度、In(标准物质)的熔点随升温速率的变化情况进行了对比分析。研究结果表明:该材料的DSC曲线上居里转变过程对应的热信号表现为一个抖动。不同条件下测得的居里温度为399~402℃,与Hall效应法测试结果基本一致。最佳的试验条件是:Al坩埚、试样称取量6mg左右、20K/min。在升温速率不小于10K/min时可以得到居里转变信号,与该材料晶化温度受热滞后影响而明显随升温速率增大而增大的情况不同,由于居里转变过程相变潜热较小,居里温度测试结果基本不受热滞后的影响。
The optimal test conditions for the Curie temperature of Fe78Si9B13 amorphous material by differential scanning calorimetry (DSC) were explored from the aspects of crucible selection, sample weight, heating rate and so on. The effects of different heating rates on the test results were analyzed. At the same time, the crystallization temperature of the material, the melting point of In (standard substance), was compared with the change of heating rate. The results show that the thermal signal corresponding to the Curie transformation on the DSC curve of the material shows a jitter. The Curie temperature measured under different conditions is 399 ~ 402 ℃, which is basically consistent with the Hall effect test results. The best test conditions are: Al crucible, the sample weighed about 6mg, 20K / min. The Curie transition signal can be obtained at a heating rate of not less than 10 K / min. Unlike the case where the crystallization temperature is affected by the heating lag but obviously increases with the heating rate, since the latent heat of phase transformation during Curie transformation is small, The Curie temperature test results are basically unaffected by thermal hysteresis.