材料比热容测试国内外试验方法比较

Comparison on Domestic and Foreign Testing Methods for Specific Heat Capacity of Materials

比热容是衡量材料热物理性能的重要参数,但是国内尚无可供参考的测试方法标准,目前常采用传统的比较法。分别采用比较法和国外的ASTM E1269-2011和DIN 51007-1994方法对蓝宝石标准试样的比热容进行了测试。结果表明:按照ASTM E1269-2011和DIN 51007-1994方法测试得到的比热容更接近于蓝宝石比热容的标准值,测试相对偏差较低,在1.3%~3.7%;而传统比较法的测试相对偏差在1.7%~4.3%。由此可见,ASTM E1269-2011和DIN51007-1994方法的测试精度更高,更适合用于材料比热容的测试。

The specific heat capacity is one of the important parameters to determine the thermal physical properties of materials,but there were no domestic testing methods for reference,and usually the traditional comparison method was used.The specific heat capacity of standard sapphire sample was tested by comparison method and method of ASTM E1269-2011 and DIN 51007-1994 separately.The results show that the specific heat capacity value tested by foreign method was closer to the standard value of sapphire compared to the value tested by comparison method.The testing relative deviation of foreign method was lower and in the range of1.3%-3.7%,and the relative deviation of traditional comparison method was in the range of 1.7%-4.3%.Therefore,the test accuracy of method of ASTM E1269-2011 and DIN 51007-1994 was higher than that of comparison method and it was more suitable for specific heat capacity testing of materials.