MANUFACTURING METHOD OF THERMOELECTRIC CONVERSION ELEMENT AND MANUFACTURING METHOD OF THERMOELECTRIC CONVERSION MODULE USING THE SAME

• Main Authors: NAKAZAWA HAYATO, TOHIRA TOMOTAKE, SHIMADA TAKESHI, NOKAWA GENYA, MATSUDA MICHIKO
• Format: Patent
• Language: English; Japanese
• Published: 07.10.2021
• Subjects: CASTING; ELECTRICITY; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING; WORKING METALLIC POWDER

To solve a problem in which a crack and the like occur in a diffusion prevention layer at a joint, and it is difficult to make the diffusion prevention layer dense at the same time as the powder of a thermoelectric conversion material.SOLUTION: A manufacturing method of a thermoelectric conversion element includes a step of sintering a thermoelectric conversion material powder containing Sb in contact with an alloy foil containing Ti and Al to obtain a thermoelectric conversion material having a diffusion prevention layer, and in the alloy foil containing Ti and Al, in a cross-section observation method that can determine an orientation difference of a crystal, when an area of 5000 μm2 or more is observed, the number of crystal grains defined by the grain boundaries with an orientation difference of 10 degrees or more is 1.0 or less/5000 μm2.SELECTED DRAWING: Figure 1 【課題】接合部における拡散防止層にクラック等が生じ、熱電変換材料の粉末と同時に、拡散防止層を緻密化させることが難しいという課題があった。【解決手段】 Ｓｂを含む熱電変換材料の粉末と、ＴｉとＡｌを含む合金箔とを接触させた状態で焼結し、拡散防止層を備えた熱電変換材料を得る工程、を有し、前記ＴｉとＡｌを含む合金箔は、結晶の方位差を判別可能な断面観察手法において、５０００μｍ２以上の広さの領域を観察したとき、１０度以上の方位差の粒界で規定される結晶粒の数が１．０個以下／５０００μｍ２であることを特徴とする熱電変換素子の製造方法。【選択図】図1