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Chromium-based alloy and manufacturing method thereof

A technology of chromium-based alloys and manufacturing methods, which is applied in the field of chromium-based alloys for fuel cell connection plates and its manufacturing, can solve the problems of impact toughness not meeting the requirements, limiting the application of chromium-based alloys, and high ductile-brittle transition temperature of chromium, so as to achieve the goal of using Long life, improved organizational structure, high temperature effect

Inactive Publication Date: 2015-03-18
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ductile-brittle transition temperature of chromium is high. Secondly, when exposed to the air at high temperature, the plasticity of the alloy will deteriorate due to the infiltration of nitrogen, and the impact toughness cannot meet the requirements.
The above-mentioned defects limit the application of chromium-based alloys

Method used

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  • Chromium-based alloy and manufacturing method thereof
  • Chromium-based alloy and manufacturing method thereof
  • Chromium-based alloy and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Design material composition and mixing: the composition of the chromium-based alloy material is 5% iron, 1.0% yttrium oxide, 13% manganese, and the rest is chromium; iron is added in the form of pure iron powder, and manganese is added in the form of manganese powder. Chromium is added in the form of reduced chromium powder or electrolytic chromium powder; the specific ratio is as follows: pure iron powder: 5%; manganese powder: 13%; yttrium oxide powder: 1%; reduced chromium powder or electrolytic chromium powder: 80.7%, Powder lubricant: 0.3%; according to the ratio, mix in a double-cone or V-shaped mixer or other mixers.

[0031] 2) Pressing, the above mixed powder is pressed on a forming press, which can be pressed by ordinary molding, the forming pressure is 700Mpa, and the forming density is 6.2g / cm 3 .

[0032] 4) Dewaxing and sintering: Carry out in the vacuum sintering integrated with dewaxing and sintering; the dewaxing temperature is 400°C, the time is 20...

Embodiment 2

[0036] 1) Design material composition and mixing: the composition of the chromium-based alloy material is 5% iron, 1.0% yttrium oxide, 7% manganese, and the rest is chromium; iron is added in the form of 434L stainless steel and ferromanganese master alloy powder, and manganese is added in the form of Ferromanganese master alloy powder (manganese content is 85-90%, carbon content is less than 0.2%, the rest is less than 2%, and the rest is iron). The chromium part is added in the form of reduced chromium powder or electrolytic chromium powder, and part is added in the form of 434L stainless steel mother alloy. Add in the form of alloy powder; the specific ratio is as follows: 434L stainless steel powder: 4.8%; ferromanganese alloy powder: 8%; yttrium oxide powder: 1%; reduced chromium powder or electrolytic chromium powder: 85.7%; powder lubricant: 0.5%; Mix in double cone or V-shape mixer or other mixers according to the ratio.

[0037] 2) Pressing, pressing the above mixed p...

Embodiment 3

[0042]1) Design material composition and mixing: the composition of chromium-based alloy materials is 5% iron, 1.0% yttrium oxide, 2% manganese, and the rest is chromium; iron is added in the form of 434L stainless steel, and manganese is added in the form of pure manganese powder. Most of the chromium is added in the form of reduced chromium powder or electrolytic chromium powder, and a small part is added in the form of 434L stainless steel; the specific ratio is as follows: 434L stainless steel: 6%; manganese powder: 2%; yttrium oxide powder: 1%; Chromium powder or electrolytic chromium powder: 90.7%, powder lubricant: 0.3%; mix in double-cone or V-shaped mixer or other mixers according to the proportion.

[0043] 2) Compression, the above mixed powder is pressed on a forming press, which can be pressed by warm compression molding, the forming pressure is 700Mpa, and the forming density is 6.3g / cm 3 .

[0044] 4) Dewaxing and sintering: Carry out in the vacuum sintering in...

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Abstract

A chromium-based alloy and a manufacturing method thereof. The chromium-based alloy comprises following components, by mass, 4-6% of Fe, 0.8-1.2% of Y2O3, 0.1-15% of Mn, not more than 2% of unavoidable impurities and the balanced chromium. The manufacturing method comprises following steps: designing the composition of the components, mixing the components, pressing the components, dewaxing the components and sintering the components to obtain the alloy, cooling the alloy, and analyzing and detecting the alloy. The chromium-based alloy is manufactured with manganese so that an organization structure of a part can be effectively improved since the manganese and manganese-iron alloy are low in melting point and can form liquid-phase sintering when the temperature is higher than 1246 DEG C, thereby finally improving the performances of the part and enabling a corrosion-resistant performance and a high-temperature performance of the chromium-based alloy to be better with influence on thermal-expansion coefficient of the material being less. The chromium-based alloy is excellent in the corrosion-resistant performance and the high-temperature-resistant performance, can be used as a joint plate in a fuel cell, is higher in operation temperature, is longer in service life and is free from greatly influencing assembly and usage since the thermal-expansion coefficient of the alloy matches with other assemblies in the fuel cell.

Description

technical field [0001] The invention belongs to the technical field of chromium-based alloys, and relates to powder metallurgy chromium-based alloys for high-temperature applications, in particular to chromium-based alloys applied to fuel cell connecting plates and a manufacturing method thereof. Background technique [0002] Metal chromium has a high melting point (1857°C), high specific strength (ratio of strength to density), good oxidation resistance, high sulfur resistance, diesel fuel, seawater corrosion performance and high thermal conductivity, so it has great potential in high temperature fields. potential application prospects. However, the ductile-brittle transition temperature of chromium is high. Secondly, when exposed to the air at high temperature, the plasticity of the alloy will deteriorate due to the infiltration of nitrogen, and the impact toughness cannot meet the requirements. These defects above limit the application of chromium-based alloys. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/06C22C1/05
Inventor 包崇玺周国燕柳睿
Owner NBTM NEW MATERIALS GRP
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