The sintering behavior and the thermoelectric performance of Ca₃Co₄O₉ multilayer laminates were studied, and a multilayer thermoelectric generator was fabricated. Compacts and multilayer samples with anisotropic microstructure and residual porosity were obtained after conventional sintering at 920 °C, whereas dense and isotropic multilayer samples were prepared by firing at 1200 °C and reoxidation at 900 °C. A hot-pressed sample has a dense and anisotropic microstructure. Samples sintered at 920 °C exhibit low electrical conductivity due to the low density, whereas the Seebeck coefficient is not sensitive to preparation conditions. However, thermal conductivity of multilayers is very low, and, hence acceptable ZT values are obtained. A transversal multilayer thermoelectric generator (TMLTEG) was fabricated by stacking layers of Ca₃Co₄O₉ green tapes, AgPd conductor printing, and co-firing at 920 °C. The TMLTEG has a power output of 3 mW at ΔT = 200 K in the temperature interval of 25 °C to 300 °C.

Ca ₃ Co ₄ O ₉的烧结行为和热电性能研究了多层层压板，并制造了多层热电发电机。在920°C的常规烧结条件下，可以获得具有各向异性微观结构和残余孔隙率的压坯和多层样品，而在1200°C的温度下烧结并在900°C的温度下进行再氧化制备了致密且各向同性的多层样品。热压样品具有致密且各向异性的微观结构。由于密度低，在920°C下烧结的样品显示出低电导率，而塞贝克系数对制备条件不敏感。然而，多层的热导率非常低，因此获得了可接受的ZT值。通过堆叠Ca ₃ Co ₄ O _9的层来制造横向多层热电发电机（TMLTEG）绿色胶带，AgPd导体印刷，并在920°C下共烧。在25°C至300°C的温度间隔内，TMLTEG在ΔT= 200 K时的功率输出为3 mW。