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| Resource processing and thermoelectric properties optimization of Bi2Te3 based zone melting crystals bar head and tail |
| Received:May 10, 2018 Revised:June 22, 2018 |
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| DOI： |
| KeyWord:thermoelectric performance; Bi2Te3; Recycling; resistance pressing sintering |
| Author | Institution |
| Kan Zongxiang |
香河东方电子有限公司 |
| Xiang Qiusheng |
钢铁冶金及资源利用省部共建教育部重点实验室 |
| Chen Lei |
河南鸿昌电子有限公司 |
| Chen Jianming |
河南鸿昌电子有限公司 |
| Chen Shushan |
香河东方电子有限公司 |
| Fan Xi’an |
钢铁冶金及资源利用省部共建教育部重点实验室 |
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| Abstract: |
| Thermoelectric (TE) materials are functional materials which can convert heat directly into electricity and vice versa. Bi2Te3 based thermoelectric materials is always the best thermoelectric materials near room temperature. In view of the present situation that high scrap rate in the processing and production of Bi2Te3 based thermoelectric materials in the semiconductor refrigeration industry, and the drawbacks of existing waste recycling technology such as environmentally unfriendly, process complicated, long cycle and high cost, the impurities in the crystals bar head and tail were removed by CO reduction and vacuum metallurgical, and the p-type Bi2Te3 based bulk materials with excellent properties were prepared by component adjustment, second smelting and RPS process. All evidences confirmed that oxide impurities such as Sb2O3 and Bi2O3 from crystals bar head and tail could be removed by carbon monoxide reduction and vacuum metallurgical process. The maximum ZT value of the sample which after component adjustment was 1.05, and these ZT values of this sample are greater than 0.9 from 303 K to 423 K. These results are comparable with the p-type Bi2Te3 based sintered sample start from high purity elements and commercial zone melting thermoelectric materials. The recycle process introduced here is a green process with no secondary pollution, low cost, efficient, high utilization rate (above 98%) and high thermoelectric performance. |
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