ASTM E 1530导热系数测试/导热性能测试/ASTME1530

ASTM E 1530 Standard test method for Evaluating the Resistance to thermal transmission of materials by the guarded heat flow meter technique.

ASTM E 1530用保护的热流计技术评定材料的耐传热性能的测试标准。

This test method covers a steady-state technique for the determination of the resistance to thermal transmission (thermal resistance) of materials in thickness of less than 25mm. This test method is useful for materials having a thermal resistance in the range from 10 to 400 ×10^-4 m² k/w thermal conductivity in the approximate range, temperature range from 150 to 400K. It can be used outside these ranges with reduced accuracy for thicker specimens and for thermal conductivity values up to 60W/(M.K)

ASTM E 1530标准与ASTM C 518测试方法及概念类似。

样品要求：The recommended specimen configuration is a 50.8±0.25mm diameter disk, having smooth flat and parallel faces. The thickness less than 25mm.

导热系数（thermal conductivity）:热流密度与温度梯度之比。即在单位温度梯度作用下物体内所产生的热流密度，单位为W/(m (℃)。导热系数是指在稳定传热条件下，1m厚的材料，两侧表面的温差为1度（K,°C）,在1秒内，通过1平方米面积传递的热量，用λ表示，单位为瓦/米·度（W/m·K,此处的K可用℃代替）。

导热系数与材料的组成结构、密度、含水率、温度等因素有关。非晶体结构、密度较低的材料，导热系数较小。材料的含水率、温度较低时，导热系数较小。

通常把导热系数较低的材料称为保温材料(我国国家标准规定，凡是平均温度不高于350℃时导热系数不大于0.12W/(m·K)的材料称为保温材料），而把导热系数在0.05瓦/米摄氏度以下的材料称为高效保温材料。

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 來源：防火網　發布時間：11/12/2010 點擊次數：4069