(1.浙江大學(xué) 材料科學(xué)與工程系，杭州 310027；
2.寧波高等專科學(xué)校 機(jī)械系， 寧波 315016)
摘 要: 通過(guò)對(duì)Bi2Te3/FeSi2疊層熱電材料的性能建模計(jì)算，得出了該結(jié)構(gòu)的平均Seebeck系數(shù)及內(nèi)電阻與熱端溫度的關(guān)系可分別用兩個(gè)三次多項(xiàng)式表征。在外阻為0.0734Ω，熱端溫度約510℃時(shí)，Bi2Te3/FeSi2疊層熱電材料的最大輸出功率值與實(shí)驗(yàn)值較為接近，在相同條件下均為計(jì)算得出的單段FeSi2材料的2.5倍，說(shuō)明該方法有效、可行。對(duì)用此方法建模設(shè)計(jì)多種單段材料組合成的梯度結(jié)構(gòu)，計(jì)算發(fā)現(xiàn)以兩種不同成分并經(jīng)相近工藝制備的均質(zhì)FeSi2材料制成的疊層結(jié)構(gòu)性能較優(yōu)，與Bi2Te3/FeSi2結(jié)構(gòu)有相同的最大輸出功率值。但從多方面分析表明，用兩均質(zhì)FeSi2材料制成的寬溫區(qū)熱電材料更具潛力。
關(guān)鍵字: 寬溫區(qū)熱電材料；性能表征；設(shè)計(jì)；輸出功率
for P-type thermoelectric materials
with large temperature span
（1.Department of Materials Science and Engineering,
Zhejiang University, Hangzhou 310027, China;
2.Mechanical Engineering Department, Ningbo College,
Ningbo 315016, China）
Abstract:Several values referring to the performance for the P-type Bi2Te3/FeSi2 graded thermoelectric materials were calculated. It is demonstrated that this simulation and calculation procedure can be proved to be effective and applicable in the design of FGM structure. The relationship between apparent Seebeck coefficient, internal resistance and hot side temperatures for the Bi2Te3/FeSi2 structure using the calculation procedure mentioned above can be described by two three-order polynomials respectively. Although the maximum power output as-calculated is somewhat higher than those as-experimented in the lower load resistance and lower than those in the higher one, their values at a load resistance of 0.0734Ω under a hot side temperature of 510℃ approximately match each other, and is 2.5 times that of monolithic material FeSi2 calculated at the same applied circumstances. The calculation also illustrates that the configuration with two FeSi2 with different compositions and similar preparations, being the best couple among all of the intensively selected P-type monolithic materials FeSi2 with measured parameters, is superior to a large degree to the structure Bi2Te3/FeSi2 in many ways, even though the same maximum power output as that of Bi2Te3/FeSi2 is calculated.
Key words: thermoelectric materials with large temperature span; performance description; design; power output
