本文關(guān)鍵詞：硅油基導(dǎo)熱膏的制備與導(dǎo)熱性能研究　出處：《青島科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 熱界面材料 導(dǎo)熱膏 導(dǎo)熱系數(shù) 硅烷偶聯(lián)劑 填料搭配

【摘要】：熱界面材料(TIMs)在實(shí)現(xiàn)功率元件與散熱裝置之間的快速傳熱方面有很重要的作用。其中,導(dǎo)熱膏具有良好的導(dǎo)熱性能,并具有一定的流動(dòng)性,只需很薄的一層就可以有效的降低接觸界面之間的熱阻,在實(shí)現(xiàn)快速傳熱方面很有應(yīng)用前景。本文用簡(jiǎn)單的物理研磨方法制備了氧化鋁／硅油導(dǎo)熱膏,用XRD和SEM等表征手段對(duì)兩種不同形貌的氧化鋁進(jìn)行了表征,對(duì)改性后的氧化鋁進(jìn)行了紅外分析,用KD2 Pro導(dǎo)熱儀對(duì)制得的導(dǎo)熱膏的導(dǎo)熱系數(shù)進(jìn)行測(cè)量。實(shí)驗(yàn)結(jié)果表明：氧化鋁的加入可以有效的提高硅油的導(dǎo)熱系數(shù),球形氧化鋁對(duì)導(dǎo)熱的增強(qiáng)效果要好于非球形氧化鋁,然而填充量卻小于非球形氧化鋁；導(dǎo)熱膏的導(dǎo)熱系數(shù)隨著氧化鋁填充量的增加而增大；氧化鋁的粒徑大小對(duì)導(dǎo)熱膏的性能也有一定影響,在四中不同尺寸的氧化鋁中,含40岬球形氧化鋁的導(dǎo)熱膏其導(dǎo)熱系數(shù)最高；硅烷偶聯(lián)劑(KH570)的加入可以有效的提高導(dǎo)熱膏的導(dǎo)熱系數(shù)；KH570的加入量在1.7wt.%-2.5wt.%時(shí),導(dǎo)熱膏具有最高的導(dǎo)熱系數(shù);不同粒徑粉料的合理搭配可以有效提高導(dǎo)熱膏的導(dǎo)熱性能,40μm和5μm的球形氧化鋁的混合比例在4：1時(shí),63vol.%的導(dǎo)熱膏的導(dǎo)熱系數(shù)達(dá)到1.64W.m-1·K-1,比單一粒徑的填充效果好很多。本文還制備了石墨纖維／硅油導(dǎo)熱膏,研究了石墨纖維添加量、硅烷偶聯(lián)劑使用、石墨纖維鍍銀處理以及金屬粉的加入對(duì)體系導(dǎo)熱性能的影響。研究結(jié)果表明：導(dǎo)熱膏的導(dǎo)熱系數(shù)隨著石墨纖維添加量的增大而增大,最大填充量為56vo1.%,導(dǎo)熱系數(shù)達(dá)到1.21W·m-1·K-1：硅烷偶聯(lián)劑KH570的加入量在2wt.%-3wt.%時(shí),效果最好；加入經(jīng)過鍍銀處理的石墨纖維,體系的導(dǎo)熱系數(shù)得到進(jìn)一步提高；不同種類的導(dǎo)熱粉料的混合使用要比單獨(dú)的使用效果更好,石墨纖維與銅粉和鍍銀銅粉的最佳混合比例(體積比)分別為10：1和4：1。晶閘管散熱器的系統(tǒng)熱阻與循環(huán)水的流量、壓裝壓力、加熱功率有關(guān),導(dǎo)熱膏的加入可以在很大程度上降低系統(tǒng)的熱阻。總體而言,自制的55vo1.%的石墨纖維與銅粉混合體系的導(dǎo)熱膏的導(dǎo)熱效果要好于填充體積為63vo1.%球形氧化鋁體系的導(dǎo)熱膏。
[Abstract]:Thermal interface material (TIMs) has a very important role in the realization of rapid heat transfer between the power element and the radiating device. The thermal paste has good thermal conductivity, and has certain liquidity, only a very thin layer can effectively reduce the thermal contact resistance of the interface, it has application prospect in to achieve rapid heat transfer. Alumina / silicone oil thermal paste prepared by means of physical grinding method simple, the characterization of two different morphologies of alumina by using XRD and SEM techniques, the modified alumina were analyzed by infrared analysis, measurement of thermal conductivity of thermal paste prepared by KD2 Pro thermal conductivity meter. The experimental results show that the addition of alumina can improve the thermal conductivity of silicone oil effectively, spherical alumina on the heat transfer of the reinforcing effect is better than the non spherical alumina, but non spherical filling amount is less than the oxidation Aluminium; thermal conductivity paste increases with the amount of alumina filled; properties of alumina particle size on the thermal paste also has certain effect in four different sizes of alumina, thermal paste containing 40 point spherical alumina, its thermal conductivity is highest; silane coupling agent (KH570) could improve the thermal conductivity the effective thermal paste; the amount of KH570 in 1.7wt.%-2.5wt.%, with the highest thermal conductivity thermal paste; reasonable collocation can effectively improve the thermal conductivity of thermal paste of different size powder, mixing ratio of spherical aluminum oxide 40 m and 5 m in 4:1, the thermal conductivity of the 63vol.% paste at 1.64W.m-1 K-1, than the single grain filling effect much better. The system also graphite fiber / silicone oil thermal paste by research, graphite fiber content, silane coupling agent, graphite fiber with silver plating And adding metal powder effect on the thermal performance of the system. The results show that the thermal conductivity of thermal paste increases with the increase of the content of graphite fiber, the maximum filling amount is 56vo1.%, the thermal conductivity reached 1.21W - M-1 - K-1: the amount of silane coupling agent KH570 has the best effect in 2wt.%-3wt.%, after adding graphite fiber; silver plating, thermal conductivity of the system has been further improved; mixed conducting powder of different kinds of use should be better than the separate use effect, the best ratio of graphite fiber and copper and silver plated copper powder (volume ratio) respectively for the system resistance and circulating water 10:1 and 4:1. thyristor radiator flow pressing pressure, heating power, thermal paste could reduce the thermal resistance of the system to a great extent. Overall, the thermal conductivity of graphite fiber made of 55vo1.% mixed with copper powder system The thermal conductivity of the paste is better than the heat conduction paste filled with 63vo1.% spherical alumina system.

【學(xué)位授予單位】：青島科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB34

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相關(guān)期刊論文 前2條

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本文編號(hào)：1378820