登录    |    注册

您好,欢迎来到中国江苏快三开奖资讯平台!

首页>《中国测试》期刊>本期导读>试样表面处理对激光法导热测量的影响

试样表面处理对激光法导热测量的影响

85    2019-04-28

¥0.00

全文售价

作者:赵瑾, 邹涛, 陈宇迪, 郭姝

作者单位:北京市理化分析测试中心, 北京 100087


关键词:LFA;激光法;导热;热扩散系数


摘要:

基于绝热条件下一维理想导热过程的原理,对激光法导热系数测量中试样状态导致的测试问题进行分析比较,提出试样表面处理方法的最优方案。针对试样的厚度、表面状态、反光度和透光度,确定导热测量中单层垂直、单层水平、双层垂直3种基本模式下试样表面处理的具体方法,对比每种方法的测试结果。实验表明,试样厚度是测试的关键影响因素,准确测量试样厚度以及预估试样临界最小厚度dmin,是测试工作的重点环节;提出显著降低测试误差,实现单层垂直和单层水平测量模式的相互转换方法;根据材料的反光度和透光度采用不同的喷涂方法,保证测试结果的准确性。该文从原理和实际操作上系统阐述试样表面处理可行的方法,为激光法导热系数测试工作提供更多的解决方案。


Effect of sample surface-treatments on thermal conductivity measurement by laser method
ZHAO Jin, ZOU Tao, CHEN Yudi, GUO Shu
Beijing Center for Physical & Chemical Analysis, Beijing 100087, China
Abstract: Founded on the principle of one-dimensional ideal heat conduction process in adiabatic condition, the test questions caused by sample state during thermal conductivity measurement by laser method were analyzed and the optimal method of sample surface-treatment was concluded. According to the thickness, surface state, reflectivity and transmittance of the sample, the specific methods of sample surface-treatment under the three basic modes of single layer vertical, single level and double vertical were determined, and the test results were compared. Experimental results show that accurate measurements of sample thickness and prediction of the specimen critical minimum thickness are the main factors during the test. The method of conversion between single vertical and single horizontal measurement mode can greatly reduce the test error. Spraying method according to the reflectivity and transmittance can promote accuracy in results. In this paper, feasible method of sample surface-treatment is systematically demonstrated in principle and practice,which can provides more testing solutions for the laser thermal conductivity measurement.
Keywords: LFA;laser flash method;thermal conductivity;thermal diffusivity
2019, 45(4):53-57  收稿日期: 2018-01-07;收到修改稿日期: 2018-02-19
基金项目:
作者简介: 赵瑾(1983-),女,山东青岛市人,助理研究员,硕士,主要从事材料热性能、热物性测试研究
参考文献
[1] 邢磊. 基于瞬态法的界面基础换热系数实验研究[D]. 大连:大连理工大学, 2007.
[2] 刘黎, 周旺枝, 张洪雷. 激光法测量材料热物理性能的原理及方法[J]. 武钢技术, 2013, 51(3):9-12
[3] 唐云杰, 陈蓓. 激光闪射法测量双层材料导热系数的实验探索[J]. 产品检测与可靠, 2013, 5:36-41
[4] 王东, 刘宗奎, 张斌, 等. 激光闪射法测试氮化硅结合碳化硅材料导热系数的研究[J]. 耐火与石灰, 2012, 37(6):121-122
[5] 刘晓燕, 郑春媛, 黄彩凤. 多孔材料导热系数影响因素分析[J]. 低温建筑技术, 2009, 135(9):3-6
[6] 张纯, 王日初, 彭超群, 等. 表面镀钨层对金刚石/铜复合材料热导率的影响[J]. 稀有金属材料与工程, 2016, 45(10):2692-2696
[7] 袁观明, 李轩科, 董志军, 等. 高导热石墨膜的制备及表征[J]. 功能材料, 2015, 46(17):17097-17106
[8] 朱教群, 宋轶, 周卫兵, 等. 基于碳材料的有机复合相变材料导热增强研究进展[J]. 储能科学与技术, 2017, 6(2):213-219
[9] WANG K, PENG H, GUO H B, et al. Effect of sintering on thermal conductivity and thermal barrier effects of thermal barrier coatings[J]. Chinese Journal of Aeronautics, 2012, 25:811-816
[10] 尹传根, 范金辰, 闵宇霖, 等. 聚酰亚胺/氮化硼导热绝缘复合材料的研究进展[J]. 绝缘材料, 2017, 50(8):34-40