Heat storage material, method for producing same, and heating device

WO2025243533A1PCT designated stage Publication Date: 2025-11-27NISSAN MOTOR CO LTD
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Patent Information

Application Number
PCT/JP2024/019280
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-05-24
Publication Date
2025-11-27

AI Technical Summary

Technical Problem

Existing heat storage materials face issues with alumina coating peeling, exposing the core and risking reaction with water or causing molten core flow, leading to reduced performance and potential adverse effects on catalysts.

Method used

A heat storage material with a γ-alumina shell having a specific crystallite diameter ratio and a manufacturing method involving boehmite-filled peeling repair, ensuring strong bonding and minimal core exposure.

Benefits of technology

The material maintains excellent performance by preventing shell peeling and core exposure, reducing adverse reactions and maintaining catalyst effectiveness without electrical heating.

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Abstract

Provided is a heat storage material excellent in performance as a heat storage material. This heat storage material is provided with heat storage particles having a core containing a phase-change-type heat storage metal capable of heat storage and heat release using a solid-liquid phase change and a shell comprising a coating film containing a metal oxide and covering the core. At least a part of the metal oxide is gamma-alumina. The ratio W440 / W400 of the half-value width W440 of a peak on the 440 plane of the gamma-alumina and the half-value width W400 of a peak on the 400 plane, obtained by x-ray diffraction intensity measurement, is 0.98 or more.
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Citation Information

Patent Citations

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