A hole sealing method for a powder metallurgy chromium alloy fuel cell connector

A powder metallurgy and fuel cell technology, applied in the direction of fuel cell components, etc., can solve the problems such as the inability to use battery connectors, achieve the effect of convenient operation, simple process, and solve the problem of air tightness

Active Publication Date: 2018-09-04
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The working temperature of the connectors is 800-1000°C, which leads to the impregnation of powder metallurgy products with resin or inorganic sodium silicate and other sealing agents, which cannot be applied to battery connectors.
[0003] At present, there are no relevant reports on the sealing treatment of powder metallurgy chromium-based products at home and abroad.

Method used

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  • A hole sealing method for a powder metallurgy chromium alloy fuel cell connector
  • A hole sealing method for a powder metallurgy chromium alloy fuel cell connector
  • A hole sealing method for a powder metallurgy chromium alloy fuel cell connector

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The chromium content is 85%, the porosity is 10%, and the powder metallurgy chromium alloy connector with a thickness of 3mm is placed in a heat treatment furnace at 800°C for 3 hours, and then heated to 900°C for 1 hour, carbon potential Cp: 1.0%, It is then cooled in air and finally sandblasted. Pore ​​morphology before sealing figure 1 As shown, the pore morphology after sealing is as follows figure 2 shown. The depth of the compound layer immersed in the internal pores of the part is 1.5mm, the thickness of the compound layer is 0.8-1.0μm, and the compound is dense and continuous.

Embodiment 2

[0022] The chromium content is 95%, the porosity is 12%, and the powder metallurgy chromium alloy connector with a thickness of 3mm is placed in a heat treatment furnace at 880°C for 3 hours, and the carbon potential Cp: 1.0%, then cooled in the air, and finally Sandblasting. The pore morphology after sealing is as follows: image 3 shown. The depth of the compound layer immersed in the internal pores of the part is 1.5mm, the thickness of the compound layer is 1.5-2.0μm, and the compound is dense and continuous.

Embodiment 3

[0024] The chromium content is 75%, the porosity is 15%, and the powder metallurgy chromium alloy connector with a thickness of 3mm is placed in a heat treatment furnace at 850°C. Carbon potential Cp: 0.8 and kept for 3 hours, then heated to 980°C. , keep warm for 1 hour, then cool in the air, and finally perform sandblasting. The morphology of the compound in the pores after sealing is as follows: Figure 4 shown. The depth of the compound layer immersed in the internal pores of the part is 0.5mm, the thickness of the compound layer is 2-3μm, and the compound is relatively loose.

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Abstract

A hole sealing method for a powder metallurgy chromium alloy fuel battery connecting part is characterized in that the powder metallurgy chromium alloy connecting part to be subject to hole sealing is put into a heat treatment furnace under the sintering state, oxidation-carbonization heat treatment under the carburizing atmosphere at 800 DEG C to 1050 DEG C is carried out, the carbon potential Cp ranges from 0.3% to 1.5%, the heat preservation time ranges from 1 h to 8 h, then cooling in the air is carried out, and finally, through sand blasting, chromium carbon / oxygen compounds on the surface of the connecting part are removed; the content of chromium in the powder metallurgy chromium alloy connecting part ranges from 75% to 100%, the porosity ranges from 5% to 20%, oil does not exist, and treatment like machining or sand blasting does not exist. The method is simple in technology and convenient to operate; the problem of gas tightness of the powder metallurgy chromium alloy connecting part is solved well, through heat treatment and sand blasting, a continuous compact compound layer is formed on the porous surface of the powder metallurgy chromium alloy connecting part, and the performance of a base body is not changed; and the gas tightness of the connecting part can be effectively improved, and the hole sealing method for the chromium alloy has the wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of energy production, and in particular relates to a hole sealing method for a powder metallurgy chromium alloy fuel cell connector of a solid oxide fuel cell stack. Background technique [0002] The working principle of the solid oxide fuel cell is to continuously feed fuel gas on the anode side, for example: hydrogen (H 2 ), methane (CH 4 ), city gas, etc., the surface of the anode with catalytic function adsorbs fuel gas, and diffuses to the interface between the anode and the electrolyte through the porous structure of the anode. Oxygen or air is continuously fed into the cathode side, and the surface of the cathode with a porous structure absorbs oxygen. Due to the catalytic effect of the cathode itself, the O 2 Gain electrons and become O 2- , under the action of chemical potential, O 2- Enter the solid oxygen ion conductor that acts as an electrolyte, diffuse due to the concentration gradient, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/24H01M8/02
CPCY02E60/50
Inventor 周国燕包崇玺詹学救柳睿
Owner NBTM NEW MATERIALS GRP
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