A preparation method of chromium-based composite material for connecting plate

A composite material and connecting plate technology are used in the preparation of chromium-based composite materials and the field of powder metallurgy alumina dispersion reinforced chromium-based composite materials, which can solve the problem of preventing large grain size chromium oxide and reducing the formation of powder metallurgy formed parts. Density and other issues, to achieve the effect of slowing chromium high temperature oxidation, low cost and simple process

Active Publication Date: 2017-02-08
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually the particle size of alumina powder is on the order of 10 μm, which is the same order of magnitude as the original particle size of chromium (10-100 μm). If alumina powder is directly added to chromium-based alloys, it is difficult to prevent oxidation of large grain sizes. The formation of chromium, and the direct addition of micron-sized alumina powder will reduce the forming density of powder metallurgy formed parts

Method used

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  • A preparation method of chromium-based composite material for connecting plate
  • A preparation method of chromium-based composite material for connecting plate
  • A preparation method of chromium-based composite material for connecting plate

Examples

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Embodiment 1

[0030] A method for preparing a chromium-based composite material for a connecting plate, the specific steps are as follows:

[0031] 1) Aluminum sol dispersion: Add alumina sol to deionized water at a ratio of 1:3.5, and disperse with magnetic stirring in a water bath at 85°C for 60 minutes until the aluminum sol is completely dispersed.

[0032] 2) Coating with chromium powder: Add the chromium powder to the dispersed aluminum sol after passing through a 100-mesh sieve, the ratio of chromium powder to alumina sol is 25:1, stir vigorously and slowly heat to 80°C, keep warm until the water evaporates completely.

[0033] 3) Drying of coated powder: transfer the above-mentioned aluminum sol coated powder to an oven at 100° C. for 2 hours for sufficient drying.

[0034] 4) Mixing: The dried aluminum sol is coated with chromium powder, iron powder and lubricant, and mixed in a double-cone or V-shaped mixer or other mixers according to the proportion. The specific ratio is as fol...

Embodiment 2

[0045] A method for preparing a chromium-based composite material for a connecting plate, the specific steps are as follows:

[0046] 1) Dispersion of aluminum sol: Add alumina sol to deionized water at a ratio of 1:10, and disperse with magnetic stirring in a water bath at 80°C for 30 minutes until the aluminum sol is completely dispersed.

[0047] 2) Coating with chromium powder: Add the chromium powder to the dispersed aluminum sol after passing through a 100-mesh sieve, the ratio of chromium powder to alumina sol is 50:1, stir vigorously and slowly heat to 80°C, keep warm until the water evaporates completely.

[0048] 3) Drying of coated powder: transfer the above-mentioned aluminum sol coated powder to an oven at 100° C. for 2 hours for sufficient drying.

[0049] 4) Mixing: The dried aluminum sol is coated with chromium powder, iron powder, tungsten powder, and lubricant, and mixed in a double-cone or V-shaped mixer or other mixers according to the ratio. The specific ...

Embodiment 3

[0059] A method for preparing a chromium-based composite material for a connecting plate, the specific steps are as follows:

[0060] 1) Dispersion of aluminum sol: Add alumina sol to deionized water at a ratio of 1:10, and disperse with magnetic stirring in a water bath at 80°C for 30 minutes until the aluminum sol is completely dispersed.

[0061] 2) Coating with chromium powder: Add chromium powder to the dispersed aluminum sol after passing through a 100-mesh sieve. The ratio of chromium powder to alumina sol is 100:1. Stir vigorously and slowly heat to 80°C, keep warm until the water evaporates completely.

[0062] 3) Drying of coated powder: transfer the above-mentioned aluminum sol coated powder to an oven at 100° C. for 2 hours for sufficient drying.

[0063] 4) Mixing: Add pure iron powder and lubricant to the dried coated chromium powder, and mix them in a V-shape mixer or other mixers. The addition amount of pure iron powder and lubricant is preferably 5wt%, and th...

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Abstract

The invention relates to a method for preparing a chromium-based composite material for a connecting plate. Aluminum oxide is adopted by the chromium-based composite material for replacing Yttrium oxide in a commercial Cr-5Fe-1Y2O3 material, the aluminum oxide in a submicron level can be uniformly and dispersedly arranged in a chromium-based body, chromium oxide crystalline grains are prevented from being thickened and enlarged, and high-temperature oxidation of chromium is slowed down. The method comprises the preparing steps of firstly, preparing aluminum sol coating chromium powder; then mixing the aluminum sol coating chromium powder with alloying elements and a lubricating agent; then, forming in a pressing way; finally, cooling after high-temperature sintering. According to the method for preparing the chromium-based composite material for the connecting plate, disclosed by the invention, the technology is simple, and the prepared chromium-based composite material has excellent high temperature-resisting performance and corrosion resistance; compared with existing commercial Cr-5Fe-1Y2O2, the cost is low, meanwhile, the thermal expansion coefficient is close to that of other components of a solid fuel cell, large influence on assembling and use cannot be generated, the chromium-based composite material can be used as a connecting plate of a fuel cell and is a feasible material for replacing the Cr-5Fe-1Y2O2, and the chromium-based composite material is suitable for being produced in a large scale.

Description

technical field [0001] The invention belongs to the technical field of chromium-based alloy composite materials, and relates to a powder metallurgy alumina dispersion-reinforced chromium-based composite material for high-temperature applications, in particular to a preparation method for a chromium-based composite material applied to fuel cell connecting plates. Background technique [0002] The solid oxide fuel cell is a clean, efficient, and noiseless green energy with an energy conversion efficiency of up to 85%, but the power of a single cell is limited, and several single cells must be assembled into a battery pack through a connector to obtain all required power. The connecting body needs to be made of materials that are resistant to high temperature oxidation, have good electrical and thermal conductivity, have thermal expansion characteristics that match those of other battery components, and can work stably for a long time. Currently there is Cr-5Fe-1Y 2 o 3 A se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/16B22F1/02C22C27/06
Inventor 柳睿马建包崇玺周国燕
Owner NBTM NEW MATERIALS GRP
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