| 摘要 |
PROBLEM TO BE SOLVED: To prevent a glass cover from cracking, by depositing/forming the glass cover contg. PbO and TeO2 to the surface of a thermoelectric converter element made of a thermoelectric conversion material contg. Pb and Te. SOLUTION: A columnar PbTe thermoelectric conversion blank 1 having electrodes 2 bonded to electrode forming faces 1a, 1b at both end faces, a glass paste is prepared by kneading a glass powder in an organic solvent, the glass powder is composed of PbO 29.1 wt.%, TeO2 20.8 wt.%, SiO2 10.5 wt.%, B2 O3 13.5 wt.%, NaO2 5.3 wt.% ZnO 3.5 wt.%, BaO 4.7 wt.% and Al2 O3 2.6 wt.%, the organic solvent uses ethyl cellulose dissolved inα-terebineal and is coated on the outer surface of the blank 1 and dried. The total content of PbO and TeO2 in the glass cover is 5-70 wt.% of the total glass material. If less than 5%, the glass cover may crack, but if over 5 wt.%, the cracking can be avoided.
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