Preparation and Properties of Thermoelectric Materials by PM Process.

PM 工艺制备热电材料及其性能。

• 批准号: 03650554
• 负责人: NAGAI Hiroshi
• 金额: $ 1.41万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650554/
• 关键词: Thermoelectric; FeSi_2; LaS_x; Powder Metallurgy; Rare Earth; Chalcogenide; Sintering; Thermoelectric Power; LaSy; カクコゲナイト; 超微粒子; 希土類; カルコゲナイト

In this study, the preparation process and the thermoelectric properties of beta-FeSi_2 and gamma-LaS_x were investigated. The results are summarized as follows:1. Preparation and properties of beta-FeSi_2.1.1. Effect of Mechanical Grinding(MG)MG and Hot-pressing significantly improved the densification and transition from alpha+epsilon phase to beta-phase. Finely dispersed epsilon-phase in beta-FeSi_2 by MG increased the thermoelectric properties by decreasing the resistivity.1.2. Effect of Co, Ni, B Addition.Co, Ni addition markedly accelerated the sintering of FeSi_2, while B addition hindered the sintering. Co addition increased the thermoelectric power, while Ni and B addition decreased the thermoelectric power.2. Preparation and properties of gamma-LaS_x.Thre are three phases(alpha、beta、gamma) in LaS_x(4/3*X*3/2) and gamma-LaS_x phase is expected to be good thermoelectric material. However, the conditions to prepare gamma-LaS_x phase have not been clarified. In this study, the preparation process of gamma-LaS_x and their thermoelectric properties were investigated. Through solid phase reaction between metallic La and S ina quartz capsule at 1273 K, it became clear that gamma-phase was obtained in the low S compositions.

本研究对β-FeSi_2和γ-LaS_x的制备过程及热电性能进行了研究，研究结果如下： 1．β-FeSi_2.1.1机械研磨的影响。热压显着改善了β-FeSi_2 中的致密化和从α+ε 相到β 相的转变，从而提高了β-FeSi_2 中的ε 相。 1.2 Co、Ni、B添加的影响 Co、Ni的添加显着促进了FeSi_2的烧结，而B的添加阻碍了烧结，而Ni和B的添加则降低了FeSi_2的热电性能。 2. γ-LaS_x的制备及性质。LaS_x(4/3*X*3/2)有三相(α、β、γ) γ-LaS_x相有望成为良好的热电材料，但目前制备γ-LaS_x相的条件尚未明确。本研究通过固相反应研究了γ-LaS_x的制备过程及其热电性能。在 1273 K 石英胶囊中的金属 La 和 S 之间，很明显在低 S 成分中获得了 γ 相。

项目成果

永井 宏: "β-FeSi_2焼結体の作製に及ぼすMGの効果" 粉体および粉末冶金. 40. 225-229 (1993)

永井浩：“MG对β-FeSi_2烧结体制备的影响”粉末与粉末冶金。 40. 225-229 (1993)

永井 宏: "β-FeSi_2焼結体の熱電特性に及ぼすMG及び添加元素の影響" 粉体および粉末冶金. 40. (1993)

Hiroshi Nagai：“MG和添加元素对β-FeSi_2烧结体热电性能的影响”粉末和粉末冶金40。（1993）

永井 宏: "β-FeSi_2焼結体の作製に及ぼすMGの効果" 粉体および粉末冶金. 40. 332-336 (1993)

永井浩：“MG对β-FeSi_2烧结体制备的影响”粉末与粉末冶金。 40. 332-336 (1993)

Hiroshi Nagai: "Effect of M.G. on the Preparation of Sintered beta-FeSi_2." J. Jpn. Soc. Powder & Powder Metallurgy. vol.40 No.3. 332-336 (1993)

Hiroshi Nagai：“M.G. 对烧结 β-FeSi_2 制备的影响。”