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A kind of preparation method of chromium alloy fuel cell connector

A fuel cell and chromium alloy technology, applied in the field of powder injection molding, can solve the problems of low connection density, high cost, high scrap rate, and achieve the effects of more design freedom, favorable for popularization and mass production, and uniform density

Active Publication Date: 2022-05-24
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The density of the connection prepared by the pressing method in the above-mentioned patent is low, and it is easy to drop edges and corners, and the scrap rate is high in large-scale production.
[0004] The connecting plate prepared by pressing and sintering has a low density, and usually must be sealed before it can be used. For example, the applicant's first patent application for Chinese rods "a method for sealing holes in powder metallurgy chromium alloy fuel cell connectors", its patent number It is ZL201410554424.2 (the authorization notification number is CN105562698B), which discloses a method of oxidizing the chromium-based connecting plate in a carburizing atmosphere, but this method requires long-term high-temperature treatment above 800°C, and the cost is relatively high

Method used

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  • A kind of preparation method of chromium alloy fuel cell connector
  • A kind of preparation method of chromium alloy fuel cell connector
  • A kind of preparation method of chromium alloy fuel cell connector

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Embodiment 1

[0038] like Figure 1 to Figure 6 shown, is the first preferred embodiment of the present invention.

[0039] The preparation method of the chromium alloy fuel cell connector of this embodiment includes the following steps in sequence:

[0040] (1) Composition of chromium alloy mixed powder

[0041] According to the weight percentage, its composition is 94% of chromium, 5% of alloy elements, 1% of rare earth oxides. The chromium in this embodiment is spherical Cr powder and irregular Cr powder. For details, please refer to image 3 As shown, the average particle size of chromium is 10um, and the tap density is 4.1g / cm 3 ; The alloying elements are iron powder and titanium powder, and the iron powder is carbonyl iron powder. For details, see Figure 5 The average particle size is 3um, the rare earth oxide is yttrium oxide powder, and its morphology is shown in Figure 4 As shown, the particle size of the rare earth oxide is 0.5um. The particle size of the above alloying el...

Embodiment 2

[0054] The preparation method of the chromium alloy fuel cell connector of the present embodiment includes the following steps in sequence:

[0055] (1) Composition of chromium alloy mixed powder

[0056] According to the weight percentage, its composition is 94% chromium, 5% alloying element, 1% rare earth oxide, wherein the particle size of chromium is 0.5um, the alloying element adopts iron powder with particle size of 10um, and the rare earth oxide adopts particle size is 5um cerium oxide powder; specifically, the weight ratio of spherical Cr powder, irregular Cr powder, iron powder and cerium oxide powder is 50:44:5:1. The Cr powder and the irregular Cr powder are melted and atomized to obtain the chromium alloy powder, and then the chromium alloy powder is added to the cerium oxide powder for mixing to obtain the chromium alloy mixed powder;

[0057] (2) Preparation of chromium alloy feed

[0058] A binder is added to the chromium alloy mixed powder in step (1) for mix...

Embodiment 3

[0066] The preparation method of the chromium alloy fuel cell connector of the present embodiment includes the following steps in sequence:

[0067] (1) Composition of chromium alloy mixed powder

[0068] According to the weight percentage, its composition is 96.5% chromium, 3% alloying element, 0.5% rare earth oxide, wherein, the chromium element adopts spherical Cr powder with a particle size of 38um, and the alloy element adopts iron powder with a particle size of 30um. The rare earth oxide adopts cerium oxide powder with a particle size of 0.5um; specifically, the weight ratio of spherical Cr powder, iron powder and cerium oxide powder is 96.5:3:0.5. The powder is melted and atomized to obtain the chromium alloy powder, and then the chromium alloy powder is added to the cerium oxide powder for mixing to obtain the chromium alloy mixed powder;

[0069] (2) Preparation of chromium alloy feed

[0070] A binder is added to the chromium alloy mixed powder in step (1) for mixi...

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Abstract

The invention relates to a preparation method of a chromium alloy fuel cell connector, wherein the preparation method of a chromium alloy fuel cell connector includes selecting components of chromium alloy mixed powder, preparing chromium alloy feedstock, injection molding, degreasing and sintering, and adopting the following steps: The metal injection molding method makes the chromium alloy mixed powder and the binder mixed and granulated. The chromium alloy feed has good fluidity and can freely fill the membrane cavity, thereby forming the desired shape of the chromium alloy fuel cell connector, and the density is high. Uniform, the density after sintering is close to full density, and no sealing is required, which can eliminate the disadvantages of low density, non-uniform density and high temperature sealing in the pressing and sintering method in the background art.

Description

technical field [0001] The invention belongs to the technical field of powder injection molding, and particularly relates to a metal powder injection molding method for a chromium alloy fuel cell connector. Background technique [0002] Chromium-based alloy materials have been widely used in the field of solid fuel cells. In order to improve the efficiency of the fuel cell, the surface shape of the fuel cell connector is generally designed to be more complex. However, the melting point of chromium is high (near 1900 ° C), the activity is strong, and it is easy to be brittle. It is prepared by traditional methods (casting + machining). Difficult and expensive. [0003] In recent years, chromium-based fuel cell connectors prepared by a single pressing-sintering method have appeared. The surface shape is directly formed, and the strength can meet the requirements after high temperature sintering. For example, the Chinese utility model patent "A Solid Oxide Fuel Cell Connector...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/22B22F3/10C22C27/06C22C1/04
CPCB22F3/225B22F3/1021C22C27/06C22C1/045
Inventor 秦晓冬包崇玺颜巍巍陈志东
Owner NBTM NEW MATERIALS GRP