粉體特性及燒結製程對平板型熱管毛細結構特性及熱傳性能之影響

The Effects of Powder Characteristics and Sintering Processes on the Wick Properties and Thermal Performance of Flat Plate Heat Pipe

吳昶輝(Chang-Hui Wu)

指導教授 ： 邱六合

大同大學/工程學院/材料工程學系所/博士(2006年)

摘要

本研究以銅粉燒結方式製備平板型熱管之毛細結構，探討不同種類的銅粉(電解粉、水霧粉、氣霧粉、氧化還原粉)及不同燒結參數(溫度及時間)所燒結成的毛細結構對平板型熱管之蒸發及其熱傳性能比較。研究結果顯示，氣霧粉體(GA)及900˚C燒結溫度為較佳的粉體及製程參數選擇，在其條件下所獲得之毛細結構，具有較低蒸發阻抗(約0.031˚C/W)，以其毛細結構燒結於123mm × 60mm × 9mm之平板型熱管內，其散熱模組相較於其他毛細結構具有較低之熱阻值(0.33˚C/W)。

關鍵字

平板型熱管 ； 燒結製程 ； 毛細特性 ； 熱傳特性

並列摘要

The purpose of this thesis is to study the effects of copper powders characteristics and sintering process parameters on the porous properties of sintered wicks. Additionally, experimental results of properties of sintered wicks are analyzed to evaluate its influence in the performance of heat pipe, and further to optimize the copper powders selection and sintering parameters decision. The results show that, the gas-atomized powder greens exhibited volume shrinkage below 10%, and the small porosity deviation in gas-atomized powder wicks at the studied sintered temperature range was less 5%. Meanwile, the wicks sintered using electrolytic deposition copper powder have the most obvious variation, including a difference in the volume shrinkage of about 42% and a variation in porosity of about 47%, which decreases with the sintering temperature between 700˚C and 1000˚C. The gas-atomized powder wick with the highest green density (6.08 g/cm3) at 800˚C sintering temperature presented the lowest volume shrinkage (0.5%) among all tested wicks. The electrolytic deposition powder wicks sintered at 1000˚C showed the larger porosity variation (15%) and the decreasing ratio of permeability (89%) than the other wicks. The permeability results were influenced by the interaction between porosity and maximum pore size of sintered wicks in this study. The permeability of electrolytic deposition powder wicks sintered from 800˚C to 1000˚C had the decrease ratio about 97% with porosity decreasing. The correlation functions of wicks properties as function of porosity, particle size, sintering temperature and sintering time duration were reported. The gas-atomized powder wick yielded the lowest evaporation resistance (about 0.031˚C/W) at heat input 90W among tested wicks. The flat plate heat pipe heat sink using gas-atomized powder had lower thermal resistance (0.33˚C/W) than the other tested flat plate heat pipe heat sinks.

並列關鍵字

Flat Plate Heat Pipe ； Sintering Processes ； Wick Properties ； Thermal Properties

參考文獻

66. C.C. Lai, “Thermal Performance of Flat Plate Heat Pipe using Different Wick Structures”, Master Thesis, (2004), Tatung University.

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