| 摘要: | 近年來，溫室氣體的排放量不斷上升，導致全球暖化問題日益嚴峻。為此，各國專家學者積極尋求可再生能源的替代方案，並致力於擴大能源回收與再利用的研究。其中，熱電發電技術因其具有廣泛的應用前景而備受關注。熱電發電是利用溫度差來發電，根據塞貝克效應（Seebeck effect），當材料兩側存在溫度差時，就會產生電位差，進而產生電流，實現熱能向電能的轉換。
儘管目前熱電材料的轉換效率仍有待提高，但利用回收廢熱發電的方式仍具有可觀的發展潛力。科學家們不斷探索新的熱電材料，並透過合成和結構設計來提升其能量轉換效率。本論文以P型Mg2SnAg0.02+25 at% Mg+4% Mg2Si熱電材料為研究對象，探討了金屬擴散接合、導電銀漿接合、薄膜沉積接合和焊接測試等方法將其與N型Mg2(SiSn)材料組成熱電元件的可行性，並對元件的接合強度和輸出特性進行了量測與分析。
實驗結果表明，最佳的串接方式為金屬擴散接合，橋接金屬選用100um Ni片。採用冷壓方式將30um Al /30um Ag /20um Sn箔片疊加在P、N試片的表面，並進行1小時燒結，使金屬擴散接合成PNPN模組。最後，在PNPN模組兩端的試片表面塗覆導電Ag漿後，使用WU-4焊料焊接組成大型熱電模組。對具有最佳參數的PNPN大型模組進行了後續的熱電性能量測，並對其接合強度和輸出特性進行了進一步的分析。
;Due to the increase in greenhouse gases in recent years, the problem of global warming has become increasingly serious, and experts from all over the world are actively searching for alternative new energy sources and expanding research on energy recycling and reuse. One of the most popular research areas is thermoelectric power generation. Thermoelectric power generation is the use of temperature difference to generate electricity, according to the Seebeck effect, when there is a temperature difference between the two sides, that is, the potential difference, which generates electric current, realizing the result of the conversion of thermal energy into electrical energy.
Currently, the conversion efficiency of thermoelectric materials is still facing challenges, but the use of recycled waste heat and the generation of temperature difference in power generation still has considerable potential for development. Scientists are constantly striving to develop new thermoelectric materials by synthesizing and designing different structures to improve their energy conversion efficiency. In this paper, we focus on P-type Mg2SnAg0.02+25 at% Mg+4% Mg2Si thermoelectric material and try to form a thermoelectric element with N-type Mg2 (SiSn) by metal diffusion bonding, conductive Ag paste bonding, and soldering test, and then we measure and analyze the bonding strength and output characteristics of the element.
In the test results, we compared the best way to connect the thermoelectric elements, the selected bridge metal is 100um Ni sheet, and use the cold-pressing method to stack the contact metal 30um Al /30um Ag /20um Sn foil on the surface of P, N specimen respectively, and sintering for 1 hour to make the metal diffusion bonded to the PNPN module. Finally, the conductive Ag paste is coated on the surface of the specimen at the front and back of the PNPN module, and soldered with WU-4 solder to form a large-scale thermoelectric module. The PNPN module with optimal parameters is subsequently measured and analyzed for bond strength and output characteristics. |
