Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 24    No. 1    January 2014

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Design and fabrication of sintered wick for miniature cylindrical heat pipe
Le-lun JIANG1, Yong TANG2, Wei ZHOU1, Lin-zhen JIANG3, Tan XIAO1, Yan LI1, Jin-wu GAO1

1. School of Engineering, Sun Yat-sen University, Guangzhou 510006, China;
2. School of Mechanical and Automotive Engineering, South China University of Technology,
Guangzhou 510640, China;
3. School of Foreign Studies, Yiwu Industrial and Commercial College, Yiwu 322000, China

Abstract:Miniature cylindrical metal powder sintered wick heat pipe (sintered heat pipe) is an ideal component with super-high thermal efficiency for high heat flux electronics cooling. The sintering process for sintered wick is important for its quality. The sintering process was optimally designed based on the equation of the heat transfer limit of sintered heat pipe. Four-step sintering process was proposed to fabricate sintered wick. The sintering parameters including sintering temperature, sintering time, sintering atmosphere and sintering position were discussed. The experimental results showed that the proper sintering temperature was 950 °C for Cu powder of 159 μm and 900 °C for Cu powders of 81 and 38 μm, respectively, while the wick thickness was 0.45 mm and sintering time was 3 h. The optimized sintering time was 3 h for 0.45 and 0.6 mm wick thickness and 1 h for 0.75 mm wick thickness, respectively, when copper powder diameter was 159 μm and sintering temperature was 950 °C. Redox reduction reaction between H2 and CuO during sintering could produce segmentation cracks in Cu powders as a second structure. Sintering at vertical position can effectively avoid the generation of gap between wick and the inner wall of pipe.

 

Key words: heat pipe; wick; sintering; porosity; shrinkage

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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