护热板法测量高温下材料导热系数的研究

doi:10.3969/j.issn.1000-1158.2023.06.06

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摘要中国计量科学研究院(NIM)新研制了单样品高温防护热板法装置,设计工作温度范围从室温至500 ℃、导热系数测量范围0.02～0.5W/(m·K)。通过新的温度控制技术,有效抑制了系统热惯性引起的热振荡,在长达2h的热平衡期内,各部件的温度波动可控制在0.005℃以内;采取上防护板温度补偿,抑制了上防护板的漏热。新装置测量导热系数的不确定度为1.2%(k=2)。在平均温度30～70℃范围,与美国国家标准技术研究院的导热系数标准参考物质NIST SRM 1450d标准值相对偏差为0.2%～1.9%。测量了有机玻璃的导热系数,与PTB测量值的相对偏差为-0.8%～-1.5%。在40～400℃温度范围,测量了高温岩棉的导热系数,测量不确定度为4.7%(k=2)。

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	刘晔
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	王金库
	王明凯
	孙坚
	徐红伟

关键词 ：计量学, 导热系数, 防护热板法, 温度控制, 岩棉

Abstract：Guarded-hot-plate (GHP) method plays the primary procedure for measurements of the thermal conductivity of insulators. The method has important applications in the fields of new material explorations and industrial energy savings. The National Institute of Metrology(NIM) has newly developed a single sample high temperature protection hot plate method device, the design working temperature ranges from room temperature to 500 ℃, and the thermal conductivity measurement range is 0.02～0.5W/(m·K). We developed a new controlling scheme that effectively suppressed the thermal oscillation caused by the thermal inertia of the big equipment ensemble. The temperature of each component of the device is continuously stablized within 0.005℃ in a period up to 2 hours. The heat leak from the upper guarded plate is a specific question with the GHP devices of the single sample type. The phenomenon become serious with increasing temperatures. We studied the temperature compensation procedure that effectively suppresses the heat leak through the upper guarded plate. We applied the device measuring the standard reference material for thermal conductivity of SRM1450d of NIST, in the sample average temperature from 30℃ to 70℃, the relative deviation from the reference values falls in the range of 0.2%～1.9% with the measurement uncertainty of 1.2% (k=2). We used the device measuring the thermal conductivity of cast polymethyl methalcylate, and observed the relative deviation of -0.8% to -1.5% from the publication data by the PTB. We then measured the thermal conductivity of mineral wool in the temperatures ranging from 40~ 400℃ with the measurement uncertainty of 4.7% (k=2 ).

Key words： metrology;thermal conductivity;guarded-hot-plate temperature control rock wool

收稿日期: 2022-08-21 发布日期: 2023-06-25

PACS:

TB94

通讯作者: 张金涛(1964-),男,湖北武汉人,中国计量科学研究院研究员,从事热物理量的精密测量技术和仪器方面的研究工作。Email:zhangjint@nim.ac.cn E-mail: zhangjint@nim.ac.cn

作者简介: 刘晔(1993-),男,安徽安庆人,中国计量大学与中国计量科学研究院联合培养硕士研究生,研究方向为检测技术与自动化装置。Email:2023326348@qq.com

引用本文:

刘晔,张金涛,王金库,王明凯,孙坚,徐红伟. 护热板法测量高温下材料导热系数的研究[J]. 计量学报, 2023, 44(6): 871-877.
LIU Ye,ZHANG Jin-tao,WANG Jin-ku,WANG Ming-kai,SUN Jian,XU Hong-wei. Study on Measuring Thermal Conductivity of Materials at High Temperature by Guarded-hot-plate. Acta Metrologica Sinica, 2023, 44(6): 871-877.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2023.06.06 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2023/V44/I6/871

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