Filled skutterudite-based alloy, production method thereof and thermoelectric conversion device fabricated using the alloy

A technology of skutterudite and base alloy, which is applied in thermoelectric devices that only utilize the Peltier or Seebeck effect, junction lead-out materials of thermoelectric devices, and manufacturing/processing of thermoelectric devices. Mineral thermoelectric conversion components and other issues, to achieve satisfactory mechanical strength, the effect of reducing production costs

Inactive Publication Date: 2005-10-19
SHOWA DENKO KK
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] However, even with this method, it is difficult to obtain a filled skutterudite thermoelectric conversion element with a satisfactory purity because the obtained alloy strip is amorphous, or it contains, for example, Sb 2 Decomposition products of Fe and Sb
Therefore, the alloy rod must be heated at temperatures between 873 and 1,073 Kelvin for five hours or more to achieve a practically usable purity, creating additional problems

Method used

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  • Filled skutterudite-based alloy, production method thereof and thermoelectric conversion device fabricated using the alloy
  • Filled skutterudite-based alloy, production method thereof and thermoelectric conversion device fabricated using the alloy
  • Filled skutterudite-based alloy, production method thereof and thermoelectric conversion device fabricated using the alloy

Examples

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example 1

[0046] Weigh the rare earth metal La, electrolytic iron and Sb to obtain LaFe 4 Sb 12 stoichiometric composition. The mixture was melted in an Ar gas atmosphere of 0.1 MPa by heating the mixture to 1400°C. Subsequently, through figure 1 The strip casting apparatus shown pours the molten alloy onto copper rolls cooled with water and rotates at a rotational speed of 0.92m / s, with a pouring speed of 150g / s and a pouring width of 85mm such that Alloy bars were formed with a thickness of 0.28 mm. Estimated cooling rate during casting is about 1×10 3 °C / sec.

[0047] The alloy bars thus formed were ground and the powder formed was analyzed by powder X-ray diffraction measurements. Such as figure 2 As shown, almost no Sb was observed 2 Fe or Sb peaks. According to the calculation of the figure, it is found that the filled skutterudite phase (such as LaFe 4 Sb 12 ) content is 98% or higher, and Sb 2 The content of Fe is 2% or less.

[0048] The alloy strip thus formed wa...

example 2

[0050] A misch metal, electrolytic iron and Sb (99%) comprising 53% by mass of the rare earth metal Ce and 47% by mass of the rare earth metal La was weighed to obtain (Ce x , La 1-x )Fe 4 Sb 12 stoichiometric composition. The mixture was melted in an Ar gas atmosphere of 0.1 MPa by heating the mixture to 1400°C. Subsequently, through figure 1 The strip casting apparatus shown pours the molten alloy onto copper rolls cooled with water and rotates at a rotational speed of 0.92m / s, with a pouring speed of 150g / s and a pouring width of 85mm such that Alloy bars were formed with a thickness of 0.28 mm.

[0051] The alloy bars thus formed were ground and the powder formed was analyzed by powder X-ray diffraction measurements. The results show that the filled skutterudite (eg (Ce x , La 1-x )Fe 4 Sb 12 ) phase content is 98% or higher, while Sb 2 The content of Fe is 2% or less.

[0052] Immediately after finishing casting the alloy, the cooling rate in the receiving box...

example 3

[0054] Weigh the rare earth metal La, electrolytic iron and Sb to obtain LaFe 4 Sb 12 stoichiometric composition. The mixture was melted in an Ar gas atmosphere of 0.2 MPa by heating the mixture to 1400°C. Subsequently, through figure 1 The strip casting apparatus shown pours the molten alloy onto copper rolls cooled with water and rotates at a rotational speed of 0.92m / s, with a pouring speed of 150g / s and a pouring width of 85mm such that Alloy bars were formed with a thickness of 0.28 mm.

[0055] The alloy bars thus formed were ground and the powder formed was analyzed by powder X-ray diffraction measurements. The results show that the filled skutterudite (such as LaFe 4 Sb 12 ) phase content is 95% or higher, while Sb 2 The content of Fe is 5% or less.

[0056] The alloy strip thus formed was then subjected to heat treatment at 550° C. for one hour in an Ar flow at atmospheric pressure. Powder X-ray diffraction measurements showed that the heat-treated product co...

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Abstract

A method for producing a filled skutterudite-based alloy includes the steps of melting alloy raw material that includes a rare earth metal R that is at least one species selected from among La, Ce, Pr, Nd, Sm, Eu and Yb, a transition metal T that is at least one species selected from among Fe, Co, Ni, Os, Ru, Pd, Pt and Ag, and metallic antimony Sb to form a melt; and rapidly quenching the melt through strip casting to form a solidified product that is the filled skutterudite-based alloy advantageously usable for a thermoelectric element.

Description

[0001] Cross References to Related Applications [0002] This application is an application filed pursuant to 35 U.S.C. §111(a), pursuant to 35 U.S.C. §119(e)(1), requesting the application 60 / 410,702 filed September 16, 2002 under 35 U.S.C. §111(b) rights and interests. technical field [0003] The present invention relates to a filled skutterudite-based alloy for use in thermoelectric conversion elements that convert thermal energy directly into electrical energy according to the Seebeck effect, and to methods of forming and utilizing the alloy Manufactured thermoelectric conversion elements. Background technique [0004] compared to e.g. CoSb 3 An intermetallic compound having a skutterudite-type crystal structure, a thermoelectric conversion material formed from a filled skutterudite-based alloy has low thermal conductivity, and the intermetallic compound is a conventional thermoelectric conversion material. Accordingly, thermoelectric materials formed from filled sku...

Claims

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Application Information

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IPC IPC(8): C22C28/00C22C12/00C22F1/00H01L35/18H01L35/22H01L35/28H01L35/34
Inventor 中岛健一郎
Owner SHOWA DENKO KK
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