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

Abstract

The invention relates to ferrite stainless steel which includes rare earth element yttrium and is used for a solid oxide fuel cell. The invention is characterized in that the invention comprises the following elements according to the mass percent: Y is 0.01 to 0.10 percent, C is lower than 0.03, Mn is 0.40 to 1.20 percent, Ni is 0.20 to 0.26 percent, Cr is 14.00 to 26.00 percent, Mo is 0.02 to 2.00 percent, W is 0.01 to 0.10 percent, P is lower than 0.04 percent, S is lower than 0.03 percent, Si is 0.01 to 0.05 percent, the residual is Fe; the thermal expansion coefficient is in the range of (11.8 to 13.0) is multiplied by 10 <-6> K at 25-1000 DEG C, and preferred in the range of (12.0 to 12.5) is multiplied by 10 <-6> K, and ferrite stainless steel alloy material is the alloy material which is particularly suitable for connecting and encapsulating the negative electrode and the positive electrode of the moderate temperature type solid oxide fuel cell, or can be used as the lighter of a vehicle engine, or can be used for high temperature boiler heating parts. The alloy is easy for the domestic industrial smelting and the processing formation, the manufacture cost is low, the alloy is suitable for the commercialization production, and has very 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 environ...

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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