Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/11029
標題: 真空熔煉法之製程時間對AgPbmSbTem+2熱電材料特性之影響
Effect of processing time on thermoelectric properties of AgPbmSbTem+2 alloy by vacuum smelting
作者: 林志忠
Lin, Chi-Chong
關鍵字: AgPb18SbTe20;AgPb18SbTe20;thermoelectric material;vacuum smelting;Figure of merit;熱電材料;真空熔煉;熱電優值
出版社: 材料工程學系所
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摘要: 
本研究是利用真空熔煉法搭配搖擺爐,藉由改變熔煉時間及降溫時間來製備AgPb18SbTe20熱電合金塊材,探討改變不同的熔煉時間與降溫時間對AgPb18SbTe20之熱電性質、顯微結構及成分的影響。
由熱電性質量測的結果,發現導電率最佳值出現在熔煉時間14小時、降溫時間40小時的試片,其值為4.95× 10² (Ω-cm)¯¹。其導電率與基底中的Ag含量有關,當Ag含量越高時,導電率隨之增加。Seebeck 係數最佳值出現在熔煉時間14小時、降溫時間80小時的試片,其值為268 (μV/K)。當半導體相的摻雜量濃度上升,會使得Seebeck 係數上升。熱導度最佳值出現在熔煉時間14小時、降溫時間40小時的試片,其值為1.58 (W/K.m)。在顯微結構方面,晶體結構主要為PbTe相。隨著熔煉時間與降溫時間的不同,會有析出相的產生。而析出相與基底的Ag和Sb摻雜原子的多寡為主要改變熱電性質優劣的原因。本研究之最佳熱電性質之條件為在熔煉時間14小時、降溫時間40小時,其熱電優值為0.056。

In this study, the Ag18PbSbTe20 thermoelectric alloy was prepared for various smelting time and various cooling time by using vibration vacuum smelting. The effects of smelting time and cooling time on thermoelectric properties, microstructures and compositions of the AgPb18SbTe20 alloy were studies.
The results of thermoelectric properties show that the optimal electrical conductivity is 4.95× 10² (Ω-cm)¯¹ for specimens smelted 14 hours and cooled from 850℃ to 450℃ for 40 hours. The electrical conductivity increase with the amount of Ag increasing in matrix. The optimal Seebeck coefficient is 268 (μV/K) for specimens smelted for 14 hours and cooled for 80 hours. As the amount of impurities in the semiconductive PbTe phase increases, the Seebeck coefficient increases. The lowest of thermal conductivity is 1.58 (W/K•m) for specimen smelted for 14 hours and cooled for 40 hours. In the microstructural aspect, the major phase of AgPb18SbTe20 is PbTe phase. Precipitates at some conditions. The amount of doping Ag and Sb atom in the precipitates and matrix affects the thermoelectric properties of AgPb18SbTe20 alloy greatly. The optimum parameters of AgPb18SbTe20 alloy by smelting are smelting time of 14 hours and cooling time of 40 hours at this condition that the best figure of merit is 0.056.
URI: http://hdl.handle.net/11455/11029
Appears in Collections:材料科學與工程學系

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