用α-Al2O3研究比热测试与MDSC条件的相关性

The Dependences of Specific Heat of α-Al2O3 on the Testing Conditions of Modulated DSC

中文关键词:  比热容,α-Al₂O₃,KCl,调制式差示扫描量热法(MDSC),相关性,相对误差

英文关键词:specific heat,α-Al₂O₃,KCl,MDSC,dependence,relative error

中文摘要:

      通过α-Al₂O₃的比热测试，研究了调制式差示扫描量热法（MDSC）测量比热（C_p）与温度（T）、线性升温速率（β）、温度调制振幅（A_T）和调制周期（ρ）的相关性，并对测试误差进行校正.实验结果表明：C_p随T提高和ρ延长而增大；但β和A_T对C_p影响不大；ρ=30 s时实测值（C^ms_p）与文献值（C^std_p）的相对误差（E^ms_r）最小，在温度为100~200 ℃范围小于3%；导出了对C^ms_p进行修正的多项式校正参数，在ρ为20~50 s、温度为100~200 ℃范围，修正后的比热（C^md_p）与文献值的相对误差（E^md_r）小于1.5%.

英文摘要:

      The dependences of specific heat (C_p) of α-Al₂O₃ on the testing conditions of MDSC, such as temperature (T), linear heating rate (β), modulated amplitude (A_T) and modulated period (ρ), were studied. The results showed that the measured specific heat (C^ms_p) increased with the increase of T and ρ, while was hardly affected by β andA_T. The relative error (E^ms_r) betweenC^ms_p and literature value (C^std_p) reached a minimum value when an optimum ρ was kept to be 30 s, which was less than 3% in the temperature range from 100 to 200 ℃. An emendation parameter to modify C^ms_p was obtained. The modified C^md_p shows good agreement with the literature C^std_p, The relative error E^md_r between C^md_p and C^std_p was less than 1.5%， when the temperature varied from 100 to 200 ℃ and the ρ value changed from 20 to 50 s.