Effect of Pore Characteristics on the Performance of Sintered Heat Pipes

• Main Authors: Yueh-Ju Lin, 林岳儒
• Other Authors: Kuen-Shyang Hwang
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/36649415223676181729

碩士 === 國立臺灣大學 === 材料科學與工程學研究所 === 91 === The recent development on computers is heavily focused on the thermal management due to the high heat generated by the powerful IC. To improve the heat dissipation capability, heat pipes have been used widely, particularly the sinter-powder types. The objective of this study was to understand the effects of the powder shape and particle size distribution on the permeability, capillarity, and the overall function of the heat dissipation. Three different powders, water atomized, electrolytic, and gas atomized Cu powders were examined. The calculation shows that the capillarity of all three powders should be strong enough to provide the water to the end of the 150mm long pipes. The performance of the pipe will be determined by the permeability. The results show that higher sintered density, finer particle size and more complicated shape give poorer permeability. The gas atomized powder with large average particle size and spherical shape has the best performance. The pore shape and the surface roughness also affect the permeability. Parts with high compacting pressure and low sintering temperature give rougher surface and more irregular pore shape and thus low permeability.