A kind of preparation method of high porosity thin-walled tubular porous copper

Abstract

A preparation method of porous copper with a high porosity in a thin walled tube shape is characterized by comprising the following steps: preparing ball-shaped copper powder and a binding agent according to a volume percentage of 50%-60%:50%-40%, heating the binding agent to a temperature of 80 to 95 DEG C, when the binding agent is totally melted, adding the ball-shaped copper powder, mixing at a temperature of 80 to 95 DEG C for 1 to 1.5 hours, pouring the fluid mixture into a cavity of a mould with a temperature of 80 to 90 DEG C, forming so as to obtain a blank, cooling, demoulding; placing the formed blank into a degreasing furnace, burying the blank into Al2O3 powder, in the protection of hydrogen gas, heating to a temperature of 45 to 55 DEG C at a heating speed of 8 to 12 DEG C per minute, maintaining the temperature for 20 to 40 minutes, heating to a temperature of 210 to 230 DEG C at a heating speed of 1 to 3 DEG C per minute, maintaining the temperature for 1 to 4 hours, heating to a temperature of 810 to 890 DEG C at a heating speed of 8 to 12 DEG C per minute, and sintering for 1 to 3 hours. The defects that mould forming is difficult to achieve after the addition of a pore-forming agent and the sintering manufacture cost is high are solved; the prepared porous copper in a thin walled tube shape can obtain a perforated structure, and moreover the preparation method has the advantages of simple technology and low manufacture cost.

Description

technical field [0001] The invention belongs to the technical field of preparing metal porous materials by powder metallurgy, in particular to a preparation method of high-porosity thin-walled tubular porous copper. Background technique [0002] There are not many reports on the preparation of high-porosity porous copper by powder metallurgy. In the open literature, the representative literature is the relevant literature published by Zhejiang Jingyuan Machinery Equipment Co., Ltd., Hebei University of Technology, Yunnan University of Technology, and Nanjing University of Science and Technology. [0003] Zhejiang Jingyuan Machinery Equipment Co., Ltd. adopts the principle of sintering-precipitation, and uses spherical metal copper powder and urea particles as raw materials. The urea particles are pore-forming materials. Uniaxial compaction under pressure, and after sintering at 900°C, the pore-forming granular material is dissolved and removed to obtain open-pore porous copp...

AI Technical Summary

Problems solved by technology

The advantage of this preparation method is that the manufacturing process is less and the process is simple. The disadvantage is that the mold is sintered during sintering, the ablation loss of the mold is large, and the high temperature resistance of the mold material is high, and the manufacturing cost is high.

[0004] High-porosity thin-wall tubular porous copper is difficult to realize by adding pore-forming agent because of the thin tube wall. Although loose-pack sintering is simple and easy to implement, the cost is relatively high.