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

A technology of solid oxides and rare earth elements, applied in fuel cells, circuits, electrical components, etc., can solve problems such as inability to guarantee compactness, inaccurate resistance data, and inability to meet SOFC performance requirements

Inactive Publication Date: 2008-06-11
JILIN INST OF CHEM TECH
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  • Abstract
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  • Claims
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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 con

Method used

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

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[0020]The present invention will be further described below in conjunction with specific embodiments.

[0021] The ferritic stainless steel containing the above-mentioned alloying elements is refined into 0.5 kg ingots by argon arc melting (Arc melting), homogenization heat treatment is performed at 1200°C for 24 hours, and isothermal treatment is performed at 800°C for 1 hour. A single ferritic stainless steel is obtained, and the mass percentages of alloying elements are as follows: Y 0.04%~0.08%, C<0.03%, Mn 0.40%~1.00%, Ni 0.20%~0.26%, Cr19.00%~24.00%, Mo 1.00% to 2.00%, W 0.05% to 0.10%, Si 0.02% to 0.05%, P<0.04%, S<0.03%, and the balance Fe. Table 1 shows the element composition of several specific embodiments of the present invention.

[0022] Table 1

[0023] Implement

[0024] Table 2

[0025] Example

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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...

Claims

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Application Information

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IPC IPC(8): C22C38/44H01M8/00H01M8/1246
CPCY02E60/50Y02P70/50
Inventor 金光熙
Owner JILIN INST OF CHEM TECH
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