| 摘要: | 在日常生活中有許多耗費能源生成，卻被作為廢棄的熱能，因此發展出熱
電效應，將熱能與電能之間做轉換，主要可分為發電及致冷，可以利用溫差產生電位差，以及電壓差以電流通入熱電元件中，使元件的端點產生吸熱及放電的現象，而此篇我們著重於用溫差產生電位差。
熱電能源算是一種綠色能源，熱電效應在這幾年逐漸被大家所重視，利用
熱 電材料的特性將廢熱轉換成電能，以達到更高的能量使用效率。可以運用於1. 機械裝置 2.人體溫差穿戴式系統 3.汽車廢熱發電 4.綠能的環保發電系統等，因此 有效率的回收散失的熱能變成一件重要的課題。
由於在轉換的過程中材料並未涉及物理及化學變化，較不會有二氧化碳或
副產物的產生，且熱電材料構造簡單，可達到熱電發電、致冷及溫差發電等功能，熱電材料的優點有體積小、噪音小、使用壽命長、安全環保，可達到輕量化小尺寸的效果，更可取代許多發熱與冷卻系統，具有商業的潛能。
本論文主要是研究 P-type Mg2(Si,Sn) 熱電材料，測試各種不同的製程參數、粉末混合比例、燒結試片的包法、Si 粉的摻雜…等，分析試片的熱電特性，選擇最佳的製程條件製備試片，並連接金屬電極進行單一元件輸出量測；其中 MgSiSn 試片的電阻約為 0.63mΩ，Seebeck 係數為 134 μV/ K，單一元件以鎳片作為試片上下兩端的金屬電極的最大輸出功率約為 339 nW，銅片則為1010 nW。
;In daily life, there are many energy generations but used as waste energy. Therefore, the thermoelectric effect is developed to convert thermal energy and electrical energy. It can be divided into power generation and refrigeration. The temperature difference can be used to generate the electric potential difference. The current flows into the thermoelectric device, causing the end of the device to absorb heat and discharge. In this thesis, we focus on generating electric power under a temperature bias. Thermoelectric energy can be regarded as a kind of green energy. In recent years people pay more and more attention to the problem of the thermoelectric effect. Use the characteristics of thermoelectric materials to convert waste heat into electrical energy to achieve higher energy efficiency. It can be used in 1. mechanical device 2. wearable devices using human body temperature difference 3.automobile waste heat generation system 4. Green energy environmentally friendly power generation system, etc. Therefore, efficient recovery of lost heat has become an important issue. Because of conversion process doesn’t involve physical and chemical changes, there will be less carbon dioxide or by-products, and the thermoelectric material has a simple structure, which can achieve the functions of thermoelectric power generation, refrigeration, and thermoelectric power generation. The advantages of thermoelectric materials are small size, low noise, long service life, safety, and environmental III protection, can achieve the effect of lightweight and small size, can replace many heating and cooling systems, and have greater development potential. The main research direction of this thesis is P-type Mg2(Si, Sn) thermoelectric materials. Testing different process parameters, powder material ratio, silicon powder doping, etc. Analyzing their thermoelectric characteristics. Finally, select the best process conditions to prepare samples and connect metal electrodes to measure the output of a single device. Among them, the resistance of the MgSiSn sample made by the best method is about 0.63mΩ, the Seebeck coefficient is 134 μV/K. The maximum output power of a single device with nickel as the metal electrode is 339 nW and copper is 1010 nW. |
