本文選題：導熱絕緣材料 + 多尺度熱導率模型�。� 參考：《重慶大學》2015年碩士論文

【摘要】：大功率LED芯片在工作時產生的熱量,不能快速有效的散失掉,將會嚴重影響大功率LED的發(fā)光強度及使用壽命。隨著節(jié)能減排、發(fā)展低碳經濟政策的推行,人們對于綠色照明光源的需求與日俱增,使得大功率LED在照明領域的應用越來越廣泛,其散熱問題是固態(tài)照明領域必須攻克的一道難關。在大功率LED的多層結構中,其層間粘接材料的低熱導率及界面處理情況成為改善其散熱問題的一個突破點。層間粘接材料需要具有較高的熱導率、粘接強度,較好的絕緣性能以及與被粘接材料相匹配的熱膨脹系數(shù),才能有效地改善大功率LED整體的散熱。本文在分析和總結絕緣導熱粘接材料發(fā)展現(xiàn)狀的基礎上,根據(jù)現(xiàn)有的研究,采用硅烷偶聯(lián)劑及水浴加熱法來改善導熱微粉及層間材料的微觀與宏觀兩種界面,制備了碳化硼/環(huán)氧樹脂、二氧化硅/環(huán)氧樹脂、氮化硼/環(huán)氧樹脂復合材料。并分別用OLYMPUS_BX53光學顯微鏡、SEM、FTIR、粘接強度測試、熱導率測試、熱膨脹系數(shù)測試、介電常數(shù)測試等對制備的復合材料進行了表征與分析。在有效介質均勻分布理論及傅里葉導熱理論的基礎上,運用Pal模型與Lewis-Nielsen模型計算理論熱導率值,結合熱導率實驗結果與SEM圖分析了范德瓦爾斯力對于復合材料熱導率的影響。在此基礎上,將制備的氮化硼/環(huán)氧樹脂粘接材料與基板材料一起,制備環(huán)氧樹脂多層復合材料,實驗測試并研究了表面處理對于多層復合材料熱導率、粘接強度、界面耐溫性能及溫度對耐久性能的影響。得到的主要結果如下:①在應用Pal模型與Lewis-Nielsen模型計算制備的碳化硼/環(huán)氧樹脂、二氧化硅/環(huán)氧樹脂復合材料熱導率時發(fā)現(xiàn):隨著導熱微粉質量分數(shù)的增加,導熱微粉之間的距離減小,范德瓦耳斯力的作用增強,實驗中二氧化硅/環(huán)氧樹脂復合材料和碳化硼/環(huán)氧樹脂復合材料的熱導率也相繼增加。通過對二氧化硅/環(huán)氧樹脂復合材料的SEM圖進行分析,證實了我們對于復合材料熱導率機理的推斷是正確的。②通過多次實驗與性能測試,確定下來最佳的導熱微粉表面處理方案。并用這種處理方法處理氮化硼導熱微粉。實驗結果表明:經表面處理后的氮化硼制備的氮化硼/環(huán)氧樹脂復合材料熱導率要遠高于未經過表面處理的氮化硼/環(huán)氧樹脂復合材料的熱導率。與此同時,經過表面處理的氮化硼/環(huán)氧樹脂復合材料的粘接強度要優(yōu)于沒有經過表面處理的氮化硼/環(huán)氧樹脂復合材料。③經過表面處理的氮化硼/環(huán)氧樹脂復合材料作為粘接劑,與基板材料一起制備的三層復合材料,其熱導率遠高于未經過表面處理的氮化硼/環(huán)氧樹脂復合材料、基板材料組成的三層復合材料的熱導率。在光學顯微鏡下觀察氮化硼/環(huán)氧樹脂三層復合材料宏觀表面發(fā)現(xiàn)(俯視圖與側視圖),未經過表面處理的氮化硼/環(huán)氧樹脂復合材料表面出現(xiàn)了明顯的熱膨脹,材料被破壞。而經過表面處理的氮化硼/環(huán)氧樹脂復合材料的表面,在溫度升高時,表面未有明顯變化,耐溫性增強。對制備的三層復合材料進行相同時長,相同溫度的熱處理,發(fā)現(xiàn)經過表面處理的三層復合材料耐久性更好。
[Abstract]:The heat generated in the high power LED chip can not be lost quickly and effectively, which will seriously affect the luminous intensity and service life of high power LED. With the energy saving and emission reduction, the development of low carbon economic policy, the demand for green lighting is increasing day by day, making the application of high-power LED more and more widely in the field of lighting. The problem of heat dissipation is a difficult problem to be overcome in the field of solid-state lighting. In the multi-layer structure of high power LED, the low thermal conductivity and interface treatment of the interlayer bonding material become a breakthrough point to improve the heat dissipation. The interlayer adhesive needs to have high thermal conductivity, bonding strength, good insulation performance and the ability to improve the heat dissipation. The thermal expansion coefficient matched by the bonding material can effectively improve the heat dissipation of the high power LED. On the basis of the analysis and summary of the current development of the insulation and heat conduction adhesive materials, according to the existing research, the silane coupling agent and water bath heating method are used to improve the micro and macro two interfaces of the heat conduction micro powder and interlayer materials, and the preparation of the materials is prepared. Boron carbide / epoxy resin, silica / epoxy resin, boron nitride / epoxy resin composites were used to characterize and analyze the composite materials prepared by OLYMPUS_BX53 optical microscope, SEM, FTIR, bonding strength test, thermal conductivity test, thermal expansion coefficient test, dielectric constant test and so on. On the basis of Fu Liye's thermal conductivity theory, the Pal model and Lewis-Nielsen model are used to calculate the theoretical thermal conductivity, and the thermal conductivity test results and the SEM diagram are used to analyze the influence of Vander Vauls Ley on the thermal conductivity of the composites. On this basis, the prepared boron nitride / epoxy resin bonding material is prepared with the substrate, and the epoxy resin is prepared. The effects of surface treatment on the thermal conductivity, bonding strength, interfacial temperature resistance and temperature on durability of multilayer composites are tested and studied. The main results are as follows: (1) boron carbide / epoxy resin, silica / epoxy resin composites prepared by using Pal model and Lewis-Nielsen model are obtained. The thermal conductivity shows that with the increase of the mass fraction of the heat conduction powder, the distance between the heat conduction micropowders decreases, and the role of van der Waals is enhanced. The thermal conductivity of the silica / epoxy resin composite and the boron carbide / epoxy resin composites are also increased in the experiment. The SEM diagram of the silica / epoxy resin composites is obtained. A row analysis confirms that the inference of the thermal conductivity mechanism of the composite is correct. 2. By several experiments and performance tests, the best surface treatment scheme for the heat conduction micro powder is determined. And this treatment is used to treat the boron nitride thermal conductive powder. The experimental results show that boron nitride / epoxy tree is prepared by the surface treated boron nitride. The thermal conductivity of the composite material is much higher than that of the boron nitride / epoxy resin composite without surface treatment. At the same time, the bonding strength of the surface treated boron nitride / epoxy resin composite is better than that of the boron nitride / epoxy resin composite without surface treatment. 3. The surface treated boron nitride / ring has been used. The oxygen resin composite material is a three layer composite made with the substrate material. The thermal conductivity of the composite is much higher than that of the boron nitride / epoxy resin composite without surface treatment. The thermal conductivity of the three layer composite material of the substrate material is observed. Under the optical microscope, the macroscopic surface of the boron nitride / epoxy resin three layer composite material is observed under the optical microscope. It is found that the surface of the boron nitride / epoxy resin composite surface without surface treatment has obvious thermal expansion, and the material is destroyed. The surface of the surface treated boron nitride / epoxy resin composite is not obviously changed at the temperature, and the temperature resistance is enhanced. The three layer composite materials are prepared. At the same time, the heat treatment at the same temperature showed that the surface treated three layer composite material had better durability.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB332

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