金属高温导热系数测量

发布时间：2018-04-18 07:46

本文选题：导热系数 + 金属材料　；参考：《安徽工业大学》2017年硕士论文

【摘要】：导热系数是表征材料物理性能不可或缺的一种基本热物性参数,反应材料的导热性能,因此对导热系数测量方法的研究就显得十分有意义。在现有的测试方法中,直接通电纵向热流法测量导热系数具有准确度高、重复性好、操作简单的优点,但是这种方法测量金属材料导热系数时在高温阶段误差较大,甚至不能测量。因此本研究依据一维导热原理,研究金属试样在高温加热和纵向通电加热条件下的传热分析,建立试样一维稳态条件下的导热方程,利用能量守恒原理,分别推导出两种测量金属导热系数的计算公式。分别选取了导热系数与温度变化趋势不同的三种典型钢种:Q235A碳钢、高锰钢、3.5镍钢作为实验测试实验。从而验证了所提出的测试计算公式的可靠性,扩大了直接电加热测量导热系数的温度范围,为金属高温导热系数的测量和运用提供参考依据。
[Abstract]:Thermal conductivity is an indispensable basic thermal physical parameter to characterize the physical properties of materials, and the thermal conductivity of reactive materials. Therefore, it is of great significance to study the measurement method of thermal conductivity.In the existing testing methods, the direct electrified longitudinal heat flux method has the advantages of high accuracy, good repeatability and simple operation. However, the error of this method in measuring the thermal conductivity of metal materials at high temperature is large.You can't even measure it.Therefore, according to the principle of one-dimensional heat conduction, the heat transfer analysis of metal samples under the condition of high temperature heating and longitudinally electrified heating is studied, and the heat conduction equation under one dimensional steady state condition is established, and the energy conservation principle is used.Two formulas for measuring the thermal conductivity of metals are derived.Three typical types of steel, namely, 1: Q235A carbon steel and 3. 5 nickel steel of high manganese steel, which have different thermal conductivity and temperature change trend, are selected as experimental test experiments.Thus, the reliability of the proposed formula is verified, and the temperature range of the direct electric heating measurement is enlarged, which provides a reference for the measurement and application of the high temperature thermal conductivity of metals.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG142.1

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