推荐回答(2个)
1、测试条件
测试准确度:±2 %~3 %
测量范围:0.005~100.0 W/(m•K) 温度范围:-30 ℃~200 ℃
2、测量方法及标准
测量方法:瞬态热线法、探针法
参考标准:ASTM C1113,GB/T 10297,ASTM D5930
对于固体的导热系数测量,其测量方法很多,如稳态法中的平板法、热流计法以及非稳态法中的瞬态热线法(THW)、瞬态平面热源法(TPS)、探针法(THP)、激光法、3ω法等。随着电子和计算机的发展,采集速度的快速提高和数据处理方式的优化,瞬态法因为测量快速、样品用量少等优点,而得到学术界和工程领域的广泛应用和快速发展。
对于导热系数测量方法的评价,目前我国以及国际上都还没有建立量值传递体系。在科学研究以及相关的工业行业标准(如ISO8302,ASTM C177, ASTM C518, ASTM D2717)中,都是以标准物质(CRM)作为评价导热系数方法和特定仪器设备的依据。在众多的测量方法中,热线法被认为是获得标准物质的标准数据(Standard Reference Data)的最好方法,也是国际纯粹与应用化学联合会(IUPAC)和美国国家标准技术局(NIST)推荐的导热系数一级测量方法。除瞬态法均具有的测量快、样品需求量低等优点外,相比于其他的瞬态法,热线法的主要优点包括:
1) 具有完整的数学模型、工作方程和和一系列可以反映实际与理想模型的偏差的修正公式; 2) 瞬态热线法是一种绝对测量法,其直接测量参数都可以以较高的准确度获得;
夏溪科技配备的基于瞬态热线法通用型导热系数仪系统,可实现-30~200度范围内各种块状、片状、薄膜、胶体、膏体、粉末、熔融体等材料的导热系数高精度测量和研究,不仅可以获得被测样品的高精度的导热系数数据,还可以获得导热系数-温度曲线。
有如下两个标准:
GB 3399-1982 塑料导热系数试验方法 护热平板法
GB/T 3139-2005 纤维增强塑料导热系数试验方法
【标准信息】
标准号:GB 3399-1982(现 行)
中文名称: 塑料导热系数试验方法 护热平板法
英文名称:Test method far thermal conductivity of plastics by means of the guarded hot plate
发布日期:1982-12-29 实施日期:1983-10-01
起草单位:化学工业部晨光化工研究院一分院
归口单位:全国塑料标准化技术委员会物理力学试验方法分会
范围:
本标准适用于护热平板稳态法测量塑料导热系数,不适用于测量导热系数大于2.20W/(m·K)的塑料。
标准号:GB/T 3139-2005(现 行)
中文名称: 纤维增强塑料导热系数试验方法
英文名称:Fiber-reinforced plastics composites. Determination of thermal conductivity
发布日期:2005-05-18 实施日期:2005-12-01
代替标准:GB/T 3139-1982
起草单位:北京玻璃钢研究设计院
归口单位:全国纤维增强塑料标准化技术委员会
标引依据:国家标准批准发布公告2005年第8号(总第82号)
范围:
本标准规定用护热板法测定纤维增强塑料导热系数的试验原理、试样、试验仪器、试验条件、试验步骤、计算结果和试验报告。
本标准适用于测定纤维增强塑料的导热系数。
【附件】
GB/T 3399-1982 塑料导热系数试验方法 护热平板法.pdf
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