采用叠片法的黄铜低温接触热阻测量

doi:10.16183/j.cnki.jsjtu.2021.394

摘要/Abstract

摘要：

以往低温接触热阻测量研究主要集中于液氮温区及以上,77 K以下温区的固体接触热阻数据鲜有报道.基于RDK-408D2型二级G-M低温制冷机,采用叠片法测量不同粗糙度和螺栓转矩下黄铜样品在10~30 K温区的接触热阻,并讨论不同因素对接触热阻的影响程度.结果表明:该温区黄铜接触面接触热阻值在6.89×10^-4~ 1.86×10^-2 m²·W/K之间,接触面粗糙度越小、温度越高、螺栓转矩越大,接触热阻就越小,结论与常规定性认识相符.该低温实验数据能够为相关低温应用设计中的连接热阻计算提供一定支持.

关键词: 接触热阻, 低温, 制冷机, 黄铜, 叠片法, 测量

Abstract:

Prior studies on cryogenic thermal contact resistance (TCR) measurement mainly focus on liquid nitrogen temperature region and above. There are limited solid TCR data in the lower temperature region. The present measurement is based on an RDK-408D2 two-stage G-M cryogenic refrigerator. By using the laminated method, the TCR data of brass samples in the temperature range of 10—30 K at different roughnesses and preloads are measured and the influence of different factors on TCR is discussed. The results show that the TCR of the brass contact surface in this temperature zone is between 6.89×10^-4 and 1.86×10^-2 m²·W/K. With a smaller roughness of the contact surface, higher temperature, and greater pre-tightening force, the TCR becomes smaller. This behavior is consistent with the conventional qualitative understanding. The above cryogenic experimental data can provide certain support for the calculation of TCR for related cryogenic application design.

Key words: thermal contact resistance (TCR), cryogenic, cryocooler, brass, lamination method, measurement

中图分类号:

TB61
O 514.2

沈逸, 曹家兴, 黄永华. 采用叠片法的黄铜低温接触热阻测量[J]. 上海交通大学学报, 2023, 57(1): 76-83.

SHEN Yi, CAO Jiaxing, HUANG Yonghua. Measurement of Cryogenic Thermal Contact Resistance of Brass by Lamination Method[J]. Journal of Shanghai Jiao Tong University, 2023, 57(1): 76-83.

图/表 12

图1

图2

表1

主要设备部件型号及参数

设备和部件	型号	数量	精度
真空泵	PFEIFFER HiCube 80 Eco	1	10^-4 Pa
冰点仪	OMEGA TRCIII-A	1	0.1 K
温控仪	Lake Shore Model 335	1	±0.01 K
数据采集仪	Keysight 34972A	1	6 $12$ 位
热电偶	OMEGA TT-T-36	8	0.1 K
加热器	非标定制25 Ω加热棒	1	25±0.5 Ω
标准温度计	LakeShore CX-1070-CU-HT	2	0.05 K
数据采集终端	Lenovo ThinkPad T410	1
扭力扳手	ADEMA数显式扳手	1	±2%
穿仓引线	26芯电缆线	1
一级冷屏	镀镍铜屏	1	厚1 mm
真空罩	铝制	1

表1

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表2

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图6

图7

图8

图9

图10

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Ra	M/(N·m)	T/K
1.6	1.0	10~30
3.2	0.8, 1.0, 1.2, 1.4	10~30
6.3	1.0	10~30