Ferritic stainless steel containing rare earth element yttrium for solid-oxide fuel battery

Abstract

The ferritic stainless steel for solid oxide fuel cells containing rare earth element yttrium of the present invention is characterized in that, by mass percentage, it contains elements: Y 0.01%-0.10%, C<0.03%, Mn0.40%-1.20% , Ni 0.20%~0.26%, Cr 14.00%~26.00%, Mo 0.02%~2.00%, W 0.01%~0.10%, P<0.04%, S<0.03%, Si 0.01%~0.05%, the balance Fe; The coefficient of thermal expansion at 25-1000°C is in the range of (11.8~13.0)×10-6 / K, preferably in the range of (12.0~12.5)×10-6 / K. The ferritic stainless steel alloy material is a An alloy material that is especially suitable for connecting the cathode and anode of a packaged medium-temperature solid oxide fuel cell, or can be used as a lighter for an automobile engine, or can be used for a heating part of a high-temperature boiler. The alloy is easy for domestic industrial smelting and processing, has low production cost, is suitable for commercial production, and has high promotion and application value.

Description

technical field [0001] The invention relates to a ferritic stainless steel alloy material. Background technique [0002] Connector materials for single cell stacking in solid oxide fuel cells (SOFC) must be airtight to the supply gas, have excellent high-temperature electrical conductivity in high-temperature environments, stability in oxidizing and reducing atmospheres, and thermal shock resistance, etc. mechanical stability. So far, the main interface of solid oxide fuel cells is LaCrO 3 A series of ceramic materials have also been studied, and metal materials are used to replace ceramic connector materials. [0003] Metal connectors can usually be used in SOFC operating environments. Although they have the advantages of high mechanical strength and deformation resistance, good thermal conductivity, and low processing costs, there is a problem that the thickness of the oxide film increases and the conductivity decreases in high temperature environments. , The thermal ex...

AI Technical Summary

Problems solved by technology

In terms of high-temperature conductivity of these materials, some of them cannot meet the performance requirements of SOFC, and the Cr formed on the surface of some alloys 2 o 3 The membrane contains columnar TiO 2 Membrane, resulting in loosening and rupture of the membrane, cannot guarantee Cr 2 o 3 Due to the compactness of the membrane, the measured resistance data is not authentic

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