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Low temperature dynamic constraint load sintering method for preparing metal polyporous material

A dynamic constraint, metal porous technology, applied in the field of preparation of metal porous materials, can solve the problems of high cost, huge equipment, complicated process, etc., and achieve the effects of controllable porosity, lower sintering temperature, and simple process

Inactive Publication Date: 2009-04-22
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of the existing pressure sintering technology, such as huge equipment, complex process and high cost, and provide a metal porous material with simple process and low cost, which can be prepared by ordinary powder metallurgy sintering furnace with controllable size and porosity Low temperature dynamic confinement loading sintering method

Method used

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  • Low temperature dynamic constraint load sintering method for preparing metal polyporous material

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Effect test

Embodiment 1

[0018] Preparation of nickel micro-flow control core: select nickel powder with a particle size of -80 ~ -400 mesh, directly put it into the sintering mold 5 dense nickel tube, press molding at 2.5 ~ 5.0MPa, and then sandwich a piece of ZrO 2 The isolation layer 3, and then press the molybdenum block with the limit block 2 (that is, the load weight 1), and use the weight of the molybdenum block to load when sintering and softening. The pressure is 2.0-15.0KPa. Vacuum sintering at ~850°C for 2 to 4 hours, when the molybdenum block falls to the limit block 2, stop falling. A small-sized (Φ3-6mm) nickel throttling body (i.e. metal porous material 4) with a porosity of 20-40% is prepared, which is used in a micro-flow controller, which can realize precise and efficient control of micro-flow and improve the efficiency of the throttling device. service life and reliability.

Embodiment 2

[0020] Preparation of large-area titanium porous plates for SPE water electrolysis electrodes: select titanium powder with a particle size of -80 ~ +400 mesh, loosely pack and vibrate into the sprayed ZrO 2 Sand (ZrO 2 In the stainless steel sintering mold 5 with sand as the isolation layer 3 (the upper template has a limit block 2), the weight of the stainless steel plate (that is, the weight 1) is used to load when sintering and softening, the pressure is 1.0-5.0KPa, and the vacuum sintering In the furnace, vacuum sinter at a temperature of 800-1000° C. for 2-4 hours, and stop falling when the stainless steel upper template falls to the limit block 2 . A large-sized (Φ140-200 mm) titanium porous plate (ie metal porous material 4) with a porosity of 40-60% is obtained, which is thin and non-deformable, and is used as an electrode for SPE water electrolysis, and has excellent conductivity, air permeability and resistance Electrochemically corrosive.

Embodiment 3

[0022] Preparation of stainless steel fiber porous plate: select stainless steel fiber with a suitable diameter in the range of 5-30μm, cut it into the required size, lay it layer by layer to a height of 200-500mm, and press molding at 8.0-10.0MPa, sandwiching a layer at the top and bottom Al 2 o 3 Ceramic paper (i.e. isolation layer 3), then put into dense stainless steel sintering mold 5, press the stainless steel plate (i.e. loading weight 1) with stopper 2 on the top of the fiber, utilize the weight of stainless steel plate to soften during sintering Time loading, the pressure is 0.5 ~ 1.0KPa, in the vacuum sintering furnace, vacuum sintering at a temperature of 800 ~ 900 ° C for 2 ~ 4 hours, when the pressed stainless steel plate drops to the limit block 2, it stops falling. A stainless steel porous fiberboard (i.e. metal porous material 4) with a porosity of 30-60% and a size of 20-500×20-500×2-50mm is obtained, which has high strength, good impact resistance and vibrat...

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Abstract

The invention discloses a low-temperature dynamic constraint loading-sintering method for preparing metal porous materials. A preparation process is as follows: to-be-sintered metal blank or powder is directly put into a sintering mold; a heat-resistant loading weight with a limiting stopper is placed on the to-be-sintered metal blank or powder; the gravity of the loading weight is utilized to apply pressure to the to-be-sintered metal blank or powder; then the sintering mold is placed in a vacuum sintering furnace; and low-temperature dynamic constraint loading-sintering is performed under the condition lower than a common metal porous material sintering temperature, so as to prepare the metal porous materials. The low-temperature dynamic constraint loading-sintering method adopted by the invention comprises the following steps of adopting a loading mold with simple structure in a common powder-metallurgy vacuum sintering furnace, utilizing the deadweight phenomenon of the mold to mutually bond metal particles thermally softened and finishing sintering the metal porous materials at a low temperature, which avoids the phenomenon that metal high-temperature grains grow up. The metal porous materials are adjustable in size and controllable in porosity. The method has the advantage of greatly reducing production cost, along with simple process.

Description

technical field [0001] The invention relates to a method for preparing porous metal materials, in particular to a low-temperature dynamic constrained loading sintering method for preparing porous metal materials. Background technique [0002] Porous metal materials are a new class of engineering materials with excellent performance in both function and structure. They are widely used in filtration and separation, fluid separation, Penetration and distribution control, noise reduction and shock resistance, high-efficiency combustion, enhanced mass and heat transfer, flame retardant and explosion-proof and other fields. [0003] Metal porous materials are often prepared by powder metallurgy method, and the sintering of powder or powder compact is one of the key processes of the preparation process, which plays a decisive role in the performance of the final product. Pressure sintering technology is a hot forming technology developed and widely used in powder metallurgy. It is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C1/08B22F3/12
Inventor 谈萍汤慧萍奚正平张健朱纪磊康新婷葛渊汪强兵王建勇
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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