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Ceramic material titanium tantalum silicon carbon for solid oxide fuel cell interconnector

A solid oxide, ceramic material technology, used in fuel cells, circuits, electrical components, etc., can solve the problems of insufficient creep resistance of alloy connector materials, mismatched thermal expansion coefficients, and decreased battery output performance, and achieve anti-oxidation. Good properties, high creep resistance, and the effect of reducing thermal stress

Inactive Publication Date: 2018-04-06
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chromium oxide will form volatile chromium compounds in the working environment, these compounds will poison the cathode, reduce the output performance of the battery, and finally accelerate the aging of the stack
[0004] 2. Thermal expansion coefficient mismatch problem
The mismatch of thermal expansion coefficient will lead to large thermal stress in the stack during the heating and cooling process, causing battery components to break
[0005] 3. Insufficient creep resistance
Creep experiments on alloy connectors show that the creep resistance of alloy connector materials is insufficient

Method used

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  • Ceramic material titanium tantalum silicon carbon for solid oxide fuel cell interconnector
  • Ceramic material titanium tantalum silicon carbon for solid oxide fuel cell interconnector
  • Ceramic material titanium tantalum silicon carbon for solid oxide fuel cell interconnector

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Effect test

Embodiment 1

[0048] When x=0.05 in the chemical formula, the selected experimental material is titanium tantalum silicon carbon material (Ti 0.95 Ta 0.05 ) 3 SiC 2 , and its preparation process is as follows:

[0049] Ti, Ta, Si, and C element powders are used as synthetic materials. The above-mentioned material powders are prepared according to the ratio of 2.85:0.15:1:2. , taken out and sieved; cold-pressed in a graphite mold with a pressure of 5MPa, and put into a hot-pressed furnace for hot-pressing synthesis. In the present invention, the technology adopted for the hot-pressing synthesis is: under the pressure of 30 MPa, heat preservation at 1650° C. for 60 minutes, and the reaction atmosphere is flowing Ar gas.

[0050] figure 1 The sintered dense (Ti 0.95 Ta 0.05 ) 3 SiC 2 XRD results of the bulk.

[0051] figure 2 It is a synthetic titanium-tantalum-silicon-carbon material (Ti 0.95 Ta 0.05 ) 3 SiC 2 SEM backscattered image of the polished surface. It can be seen th...

Embodiment 2

[0061] When x=0.005 in the chemical formula, the selected experimental material is titanium tantalum silicon carbon material (Ti 0.995 Ta 0.005 ) 3 SiC 2 , and its preparation process is as follows:

[0062] Ti, Ta, Si, and C element powders are used as synthetic materials. The above-mentioned material powders are prepared according to the ratio of 2.985:0.015:1:2. The raw powders are mixed in a ball mill tank, and the ball milling time is 10 hours. , taken out and sieved; cold-pressed in a graphite mold with a pressure of 3 MPa, and put into a hot-pressed furnace for hot-pressing synthesis. In the present invention, the technology adopted for the hot-pressing synthesis is: under the pressure of 20 MPa, heat preservation at 1600° C. for 40 minutes, and the reaction atmosphere is flowing Ar gas. The density of the synthesized material is 98.6%. The oxidation kinetic constant at 800°C is: 9.86×10 -14 g 2 cm -4 ·s -1 .

Embodiment 3

[0064] When x=0.5 in the chemical formula, the selected experimental material is titanium tantalum silicon carbon material (Ti 0.5 Ta 0.5 ) 3 SiC 2 , and its preparation process is as follows:

[0065] Ti, Ta, Si, and C element powders are used as synthetic materials. The above-mentioned material powders are prepared according to the ratio of 1.5:1.5:1:2. , taken out and sieved; cold-pressed in a graphite mold with a pressure of 10MPa, and put into a hot-pressed furnace for hot-pressing synthesis. In the present invention, the technology adopted for the hot-pressing synthesis is: under 70MPa pressure, heat preservation at 1650°C for 30 minutes, then heat preservation at 1400°C for 60 minutes, and the reaction atmosphere is flowing Ar gas. The density of the synthesized material is 98.1%. The oxidation kinetic constant at 800°C is: 1.25×10 -13 g 2 cm -4 ·s -1 .

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Abstract

The invention belongs to the technical field of energy engineering and technology, in particular to a novel ceramic material titanium tantalum silicon carbon used for a solid oxide fuel cell (SOFCs) interconnectors. The chemical formula of the novel ceramic material is (Ti<1-x>TaM<x>)<3>SiC<2> (x=0.005-0.5). The ceramic material has better oxidation resistance and electrical conductivity than commercial alloy Crofer22 APU; the thermal expansion coefficient is (9.2+ / -0.5)*10<-6>K<-1>, and is close to the thermal expansion coefficient of SOFCs electrolyte yttria-stabilized zirconia (YSZ), that is 10.5*10<-6>K<-1>; the creep resistance is high, the thermal stability is good, and processing is easy. Compared with alloy interconnector materials, the ceramic material is most characterized in that the ceramic material does not generate volatile contaminants in the SOFCs working environment, avoids poisoning of a cathode and deteriorating of stack performance. Therefore, the ceramic interconnector material can solve the problem of volatilization of the alloy connector during use, and has a great practical prospect in SOFCs.

Description

technical field [0001] The invention belongs to the field of energy engineering and technology, and in particular relates to a novel ceramic material titanium tantalum silicon carbon used for solid oxide fuel cell (SOFCs) connectors. Background technique [0002] Due to the advantages of using carbon-containing fuels, high power generation efficiency and low power generation cost, solid oxide fuel cells have broad application prospects in the fields of distributed power stations and power sources. But its linker material is one of the bottlenecks in the development of SOFCs. Before the 1990s, the connector material of SOFCs was lanthanum chromate or doped lanthanum chromate, but this connector material has many disadvantages: the battery is required to work at above 1000 ° C, the sintering performance in air is poor, and the thermal conductivity is not good. Good, difficult to form, easy to form oxygen vacancies, poor low temperature conductivity, etc. After the 1990s, as ...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/58C04B35/622C04B35/645H01M8/0215
CPCC04B35/5607C04B35/58085C04B35/622C04B35/645C04B2235/404C04B2235/422C04B2235/428C04B2235/602C04B2235/656C04B2235/6567C04B2235/658C04B2235/9607C04B2235/9684H01M8/0215Y02E60/50
Inventor 郑莉莉李美栓李希超钱余海徐敬军
Owner QINGDAO UNIV