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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  • Summary
  • 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 examp

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 Embodiment

[0045] Example 1:

[0046] Weigh the rare earth metal La, electrolytic iron and Sb to obtain LaFe 4 Sb 12 The stoichiometric composition. The mixture was melted in an Ar atmosphere of 0.1 MPa by heating the mixture to 1400°C. Subsequently, through figure 1 The bar casting equipment shown casts molten alloy onto a copper roller, which is cooled by water and rotated at a rotation speed of 0.92m / s, where the casting speed is 150g / s and the casting width is 85mm, thus An alloy strip with a thickness of 0.28 mm is formed. It is estimated that the 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 measurement. Such as figure 2 As shown, Sb is hardly observed 2 Fe or Sb peak. According to the calculation, it is found that the filled skutterudite phase (such as LaFe 4 Sb 12 ) The content is 98% or higher, while Sb 2 The content of Fe is 2% or less.

[0048] The alloy bar thus...

Example Embodiment

[0049] Example 2:

[0050] The mixed rare earth metal, electrolytic iron and Sb (99%) including 53 mass% of rare earth metal Ce and 47 mass% of rare earth metal La are weighed to obtain (Ce x , La 1-x )Fe 4 Sb 12 The stoichiometric composition. The mixture was melted in an Ar atmosphere of 0.1 MPa by heating the mixture to 1400°C. Subsequently, through figure 1 The bar casting equipment shown casts molten alloy onto a copper roller, which is cooled by water and rotated at a rotation speed of 0.92m / s, where the casting speed is 150g / s and the casting width is 85mm, thus An alloy strip with a thickness of 0.28 mm is formed.

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

[0052] Immediately after finis...

Example Embodiment

[0053] Example 3:

[0054] Weigh the rare earth metal La, electrolytic iron and Sb to obtain LaFe 4 Sb 12 The stoichiometric composition. The mixture was melted in an Ar atmosphere of 0.2 MPa by heating the mixture to 1400°C. Subsequently, through figure 1 The bar casting equipment shown casts molten alloy onto a copper roller, which is cooled by water and rotated at a rotation speed of 0.92m / s, where the casting speed is 150g / s and the casting width is 85mm, thus An alloy strip with a thickness of 0.28 mm is formed.

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

[0056] The alloy bar thus formed was subjected to a heat treatment at 550°C for one hour in an Ar gas flow at atmospheric pressure. Powder X-ray diffraction measurements show that the heat-treat...

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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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