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成果報告書詳細
管理番号20170000000115
タイトル*平成27年度中間年報 未利用熱エネルギーの革新的活用技術研究開発 熱電変換材料の技術シーズ発掘小規模研究開発 シリサイド系多孔質熱電変換材料を用いた高効率熱電変換素子の研究開発
公開日2017/5/10
報告書年度2015 - 2015
委託先名株式会社白山製作所
プロジェクト番号P15007
部署名省エネルギー部
和文要約
英文要約Title:Research and Development Project for Innovative Thermal Management Materials and Technologies

Incubation Research on Innovative Technologies in the Thermoelectric Materials

Title : Research and Development for Innovative Technologies for the Using of Waste Heat Energies / Small Scale of Research and Development for Finding of Technical Seeds / Research and Development for High Efficient Thermoelectric Element of Silicide Materials

1, We requested both National institute of Advanced Industrial Science and Technology (AIST) and Industrial Research Institute of Ishikawa (IRII) to evaluate the thermoelectric properties of our samples which contain magnesium, silicon and tin.
The results of AIST show as follows.
(1) Seebeck coefficients are measured at temperature between 300K and 750K. The magnitudes of them are about two thirds compared with the ones that were made by SPS method.
(2) The electrical resistivity of our samples shows almost the same value as that of SPS samples. This is a striking difference compared with other porous materials which has always shown the big value of the electrical resistivity
(3) Power factor can be calculated using the value of Seebeck coefficient and electrical resistivity (PF=S2/ρ).The value of it shows over 10-3W/mK2 which is nearly equal to the value of the SPS samples.
(4) The thermal conductivities (κ) are measured by laser flash method. The results show big dispersion between 0.5~3W/K. It is considered that the samples did not have uniformity because of the lack of porous homogeneity.
(5) The thermal conductivities are also measured by Steady State Thermal Conductivity Measurement Method in IRII. About 1 W/mK is obtained.
(6) The value of the dimensionless figure of merit can be calculated using the value of PF and thermal conductivities (Z=(PF/κ)T). ZT~1.2 is obtained in our samples, but ZT>2 cannot be obtained because of imperfection of crystal structure and the lack of porous homogeneity.
(7)Because of the lack of the uniformity of our samples, the results of evaluation of the thermoelectric properties in AIST and in IRII show the small difference.

2, Next stage of proceeding is as follows.
(1) We will try to improve the uniformity of our samples to control the process of giving the porous character.
(2 ) We also continue to give our efforts to get the higher ZT. Our target is still ZT>3.
(3) After above improving, we will request again for AIST and IRII to evaluate the thermoelectric properties of our samples.
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