IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0585367
(2009-09-14)
|
등록번호 |
US-8420184
(2013-04-16)
|
우선권정보 |
TW-97136359 A (2008-09-22) |
발명자
/ 주소 |
- Bai, Ching-Yuan
- Wu, Min-Sheng
- Ger, Ming-Der
|
출원인 / 주소 |
- National Defense University
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
3 |
초록
▼
A method for preparing a surface modification coating of metal bipolar plates is disclosed, which comprises the following steps: providing a substrate; pre-treating the substrate by processing the substrate, depositing a Ni-layer on the substrate, or a combination thereof, to form an activated layer
A method for preparing a surface modification coating of metal bipolar plates is disclosed, which comprises the following steps: providing a substrate; pre-treating the substrate by processing the substrate, depositing a Ni-layer on the substrate, or a combination thereof, to form an activated layer on the surface of the substrate; packing the substrate in a powder mixture containing a permeated master metal, an activator, and filler powder; and heat-treating the packing to allow the permeated master metal to diffuse into the activated layer and then to form a surface modification coating. The permeation rate of the permeated master metal can be increased due to the activated layer having a high defect concentration. Hence, it is possible to prepare a surface modification coating at a low temperature. The surface modification coating of the present invention can also decrease the interface contact resistance between the bipolar plates and gas diffusion layers.
대표청구항
▼
1. A method for preparing a surface modification coating of metal bipolar plates, comprising the following steps: (A) providing a substrate, wherein the substrate is an iron-based alloy;(B) pre-treating the substrate by substrate processing, depositing a Ni-layer on the substrate, or a combination t
1. A method for preparing a surface modification coating of metal bipolar plates, comprising the following steps: (A) providing a substrate, wherein the substrate is an iron-based alloy;(B) pre-treating the substrate by substrate processing, depositing a Ni-layer on the substrate, or a combination thereof, to form a defective activated layer on the surface of the substrate; wherein the defective activated layer by means of depositing a Ni-layer on the substrate has a high defect concentration containing a large amount of grain boundaries, dislocations, voids; wherein the defective activated layer by means of the substrate processing exhibit rough microstructures which contain a large amount of voids, dislocations, grain boundaries, and plastic deformation zones and extremely high residual stress;(C) packing the substrate in a powder mixture, wherein the powder mixture comprises a permeated master metal, an activator, and filler powder; wherein the permeated master metal is Cr or a Cr-alloy, and(D) heat-treating the powder mixture and the substrate packed therein to make the permeated master metal diffuse to the defective activated layer so as to form a surface modification coating, wherein the surface modification coating is made of chromium-iron carbides, chromium-iron nitrides, or a combination thereof. 2. The method as claimed in claim 1, wherein the substrate processing in the step (B) is electrical discharge machining, sand blasting, rolling, or punching. 3. The method as claimed in claim 2, wherein a discharge current applied in the electrical discharge machining is in a range of 1 A to 10 A. 4. The method as claimed in claim 2, wherein a size of sand particles used in sand blasting is in a range of 50 to 300 meshes. 5. The method as claimed in claim 1, wherein the activator is a halide. 6. The method as claimed in claim 1, wherein a content of the permeated master metal is 5 to 30% by weight based on a total amount of the powder mixture. 7. The method as claimed in claim 1, wherein a content of the activator is 1 to 10% by weight based on a total amount of the powder mixture. 8. The method as claimed in claim 1, wherein a temperature of the heat-treatment in the step (D) is in a range of 400 to 800° C. 9. The method as claimed in claim 1, wherein the heat-treatment in the step (D) is performed under vacuum, or an ambient or protective atmosphere.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.