摘要
本文研究了非金属刚性材料导热系数的两种测定方法。在室温常压下，对标准试样用方法一的测试值与国际推荐值之间的最大偏差小于１％。方法一与二作比对测试，其最大偏差小于１％。在温度≤５３０Ｋ及压力≤１０Ｍｐａ下，用方法二测试了岩石热导系数随温，压变化的规律。对测试装置的原理性误差以及二次仪表的测量误差分别进行分析和讨论。温压下，其测量结果的最大误差小于７％。
The two transient hot wire methods for measuring the thermal conductivity of nonmetallic rigid materials are presented in this paper.For the first method,a platium wire (Φ=0.1mm)is embeded between two pieces of the sample.The wire is used as both a heating element and a resistance temperature detector(RTD),and formed one arm of a high precision Kelvin bridge.An adjustable resistance R m with a very low temperature coefficient is formed the other arm of the bridge.A temperature rise of the wire is measured by the unbalanced bridge.The thermal conductivity of the materials can be obtained from the temperature rise over a known time interal.The method is an absolute measurement one.The second method is that one of the above mentioned sample pieces is replaced by a soft material with known thermal conductivity.Its measurement procedure is same as the first one.The results of the former can be used as a standard.For the first method,under (291K,0.1MPa) condition comparing the experimental results of fused quartz(99.9%SiO 2),glycerine (AR) with the TPRC recommended values,the maxium relative error is less than 1%.Comparing the second method with the first one,the maxium relative error is also less than 1%. In addition,the second method was used to measure the thermal conductivities of some rocks,under(291～530K,0.1～10MPa) conditions.Detailed discussion on the measurement principle and error analysis were prsented.The maxium relative error is less than 7%.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
1997年第1期38-44,共7页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金
中国科学院资助项目
关键词
导热系数
非金属刚性材料
测量
室温常压
Thermal conductivity,High Pressures and middle temperatures, Nonmetallic rigid materials.
