本文選題：熱電材料　切入點(diǎn)：化學(xué)鍍　出處：《合肥工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著環(huán)境污染和能源問題的加劇,對熱電材料等新型能源轉(zhuǎn)化材料的研究得到廣泛關(guān)注。Bi-Te基熱電材料是室溫附近性能最佳的熱電材料,但仍存在熱電轉(zhuǎn)換效率較低、機(jī)械性能較差等問題。本文以n型和p型Bi-Te基熱電粉體為基體,采用化學(xué)還原沉積法在粉體表面修飾不同種類和含量的金屬層,然后燒結(jié)成塊體試樣,探究其對材料的熱電及機(jī)械性能的影響,具體內(nèi)容如下:1、探究了表面修飾Ni含量對p型Bi_(0.5)Sb_(1.5)Te_3/Ni塊體試樣的性能影響。熱壓和放電等離子燒結(jié)Bi_(0.5)Sb_(1.5)Te_3/Ni塊體試樣的ZT值基本不變或略有下降。但Ni含量較低時(shí),Bi_(0.5)Sb_(1.5)Te_3/Ni塊體合金的Seebeck系數(shù)大幅度上升,該工作為后續(xù)實(shí)驗(yàn)提供了思路。2、研究化學(xué)鍍Cu含量對p型Bi_(0.5)Sb_(1.5)Te_3/Cu塊體試樣的性能影響。隨著Cu含量的增加,試樣的載流子濃度上升,載流子遷移率下降。Bi_(0.5)Sb_(1.5)Te_3/Cu試樣的電導(dǎo)率明顯提高,晶格熱導(dǎo)率大幅度下降,熱電性能得到改善。同時(shí),隨著Cu含量的上升,ZT峰值向高溫端偏移。低溫區(qū)性能最好的試樣Cu含量為0.05wt.%,ZT峰值在372K從_(0.5)9提高到1.08。Cu含量增加到0.22wt.%時(shí),ZT峰值移動(dòng)到高溫區(qū)域(573K)從0.12提高到0.89。3、基于以上實(shí)驗(yàn)結(jié)果,采用在Bi_(0.5)Sb_(1.5)Te_3粉末基體表面先鍍Ni提高試樣的Seebeck系數(shù),再鍍Cu同時(shí)提高功率因子和降低熱導(dǎo)率的方法提高材料的性能。相比于Bi_(0.5)Sb_(1.5)Te_3/Cu試樣,Bi_(0.5)Sb_(1.5)Te_3/Ni-Cu試樣的功率因子上升,晶格熱導(dǎo)率進(jìn)一步下降。在含有_(0.3)wt.%Ni和0.15wt.%Cu的試樣中,ZT峰值在473K從_(0.3)2提高到1.16,材料的熱電性能得到進(jìn)一步提高。4、探究了化學(xué)鍍Cu含量對n型Bi_2Te_(2.7)Se_(0.3)/Cu塊體試樣的影響。Bi_2Te_(2.7)Se_(0.3)/Cu試樣的Seebeck系數(shù)大幅度上升,因而功率因子大幅度上升,說明電傳輸性能得到明顯改善。與Bi_(0.5)Sb_(1.5)Te_3/Cu試樣相似,調(diào)節(jié)Cu含量可以改善試樣在不同溫度區(qū)間的熱電性能。高溫區(qū)性能最好的試樣Cu含量為0.05wt.%,ZT峰值在623K從_(0.3)5提高到0.85。Cu含量增加到0.15wt.%時(shí),ZT峰值移動(dòng)到低溫區(qū)域(373K)從0.24提高到0.71。同時(shí),無論金屬層的種類和含量,所有經(jīng)過表面修飾的試樣的機(jī)械性能得到提高。
[Abstract]:With the increasing of environmental pollution and energy problems, the research on new energy conversion materials, such as thermoelectric materials, has received wide attention. Bi-Te based thermoelectric materials are the best thermoelectric materials near room temperature, but there are still low efficiency of thermoelectric conversion. In this paper, n type and p type Bi-Te based thermoelectric powder were used as the matrix, the surface of the powder was modified with different kinds and contents of metal layer by chemical reduction deposition method, and then sintered into bulk sample. To explore its effect on the thermoelectric and mechanical properties of materials, The specific contents are as follows: 1. The effect of surface modified Ni content on the properties of p-type Bi_(0.5)Sb_(1.5)Te_3/Ni bulk samples is investigated. The ZT values of Bi_(0.5)Sb_(1.5)Te_3/Ni bulk samples by hot pressing and Spark plasma sintering are basically unchanged or slightly decreased, but when Ni content is low, there is no significant difference between them. The Seebeck coefficient of gold increased greatly. This work provides ideas for further experiments, and studies the effect of electroless Cu plating on the properties of p-type Bi_(0.5)Sb_(1.5)Te_3/Cu bulk samples. With the increase of Cu content, the carrier concentration of the sample increases, and the carrier mobility decreases. The lattice thermal conductivity is greatly reduced and the thermoelectric properties are improved. With the increase of Cu content, the peak value of ZT shifted to the end of high temperature. The peak value of Cu in the sample with the best properties in the low temperature region was 0.05wt.t. ZT from 372K to 1.08.Cu, which moved from 0.12 to 0.89.3K. based on the above experimental results, the peak value of ZT shifted from 0.12 to 0.89.3K, and the peak value of ZT shifted to the high temperature region from 0.22wt.% to 0.22wt.% at 372K. The Seebeck coefficient of the sample was improved by Ni plating on the surface of the Bi_(0.5)Sb_(1.5)Te_3 powder, then the power factor and the thermal conductivity of the sample were increased by Cu plating. Compared with the Bi_(0.5)Sb_(1.5)Te_3/Cu sample, the power factor of the Bi_(0.5)Sb_(1.5)Te_3/Cu sample was increased. The lattice thermal conductivity decreased further. The peak value of ZT at 473K was increased from 0.3k-2 to 1.16 in the samples containing 0.3wt. Ni and 0.15wt. Cu.The thermoelectric properties of the materials were further improved .4.The effect of electroless Cu plating on n-type Bi_2Te_(2.7)Se_(0.3)/Cu bulk samples was investigated. The Seebeck coefficient of. As a result, the power factor has been greatly increased, which indicates that the electrical transport performance has been improved obviously, which is similar to that of the Bi_(0.5)Sb_(1.5)Te_3/Cu sample. Adjusting Cu content can improve the thermoelectric properties of the samples at different temperatures. The Cu content of the best samples in the high temperature region is 0.05wt.TZ the peak value of ZT increases from 0.3kg to 0.85wt.% at 623K, and the peak value shifts from 0.24 to 0.71K in the low temperature region. The mechanical properties of all surface modified samples were improved regardless of the type and content of the metal layer.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG174.4

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