Micro-nano graded porous copper and preparation method thereof

A graded porous, micro-nano technology, applied in the preparation of micro-nano graded porous copper, the field of micro-nano graded porous copper, can solve the problems of uneven pore structure, high cost, complicated operation, etc., to improve gas-liquid flow and ion exchange. The effect of speed, large specific surface area and simple process

Inactive Publication Date: 2020-12-08
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation methods of micro-nano hierarchical porous metals include solid-gas eutectic directional solidification, percolation casting method, hydrogen template method, etc., but these methods have complicated operation, high cost or uneven pore structure, and the method o

Method used

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  • Micro-nano graded porous copper and preparation method thereof
  • Micro-nano graded porous copper and preparation method thereof
  • Micro-nano graded porous copper and preparation method thereof

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[0028] The invention discloses a method for preparing micro-nano graded porous copper. The preparation method is a combination of adding a pore-forming agent method and a dealloying method, and is specifically implemented according to the following steps:

[0029] Step 1. Weigh copper powder, manganese powder and sodium chloride particles in a certain proportion, and mix the powder evenly;

[0030] In step 1, the molar ratio of copper powder to manganese powder is 4:6-5:5.

[0031] In step 1, the amount of NaCl particles accounts for 60-80vol% of the total volume of the three raw materials of copper powder, manganese powder and sodium chloride particles.

[0032] In step 1, the powder mixing time is 4-8h.

[0033] Step 2. Fill the uniformly mixed powder in step 1 into the mold, press with a certain pressure, and hold the pressure for a certain period of time;

[0034] In step 2, the molding pressure is 2-20MPa, and the holding time is 1min;

[0035] Step 3. Place the sample...

Embodiment 1

[0044] Step 1: Weigh copper powder and manganese powder with a molar ratio of 5:5, and weigh 60 vol% of the total volume ratio of sodium chloride particles, and mix the powder for 8 hours.

[0045] Step 2: Weigh the uniformly mixed powder and fill it into a mold, press at a pressure of 10 MPa, and hold the pressure for 1 min.

[0046] Step 3: Place the pressed sample in a high-temperature tube furnace for sintering at a heating rate of 10°C / min. The sintering temperature is 870°C, keep it warm for 4 hours, and take out the sample after cooling with the furnace. The whole process is protected by argon gas.

[0047] Step 4, polish the surface of the sintered sample on sandpaper, and place it in a water bath with a constant temperature of 60° C. for immersion.

[0048] Step 5, take out the sample after water immersion, and then place it in 0.1mol / L HCl solution for dealloying. The dealloying process is carried out in a water bath at a constant temperature of 70°C. No obvious bub...

Embodiment 2

[0051] Step 1: Weigh copper powder and manganese powder with a molar ratio of 5:5, and weigh 70 vol% of the total volume ratio of sodium chloride particles, and mix the powder for 4 hours.

[0052] Step 2: Weigh the uniformly mixed powder and fill it into a mold, press with a pressure of 2MPa, and hold the pressure for 1min.

[0053] Step 3: Place the pressed sample in a high-temperature tube furnace for sintering at a heating rate of 10°C / min, the sintering temperature is 820°C, keep it warm for 4 hours, and take out the sample after cooling with the furnace. The whole process is protected by argon gas.

[0054] Step 4: Polish the surface of the sintered sample on sandpaper to make it bright, and place it in a water bath with a constant temperature of 60° C. for water immersion.

[0055] Step 5, take out the sample after water immersion, and then place it in 0.1mol / L HCl solution for dealloying. The dealloying process is carried out at a constant temperature of 70°C in a wat...

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Abstract

The invention discloses a preparation method of micro-nano graded porous copper. The preparation method is specifically implemented according to the following steps that S1, copper powder, manganese powder and sodium chloride particles are weighed according to a certain proportion and mixed uniformly; S2, the uniformly mixed powder in S1 is filled into a mold and pressed at a certain pressure, andthe pressure is maintained for a certain period of time; S3, a sample pressed in S2 is placed in a high-temperature tubular furnace, sintered at a certain heating rate, subjected to heat preservationfor a certain period of time, cooled along with the furnace and then taken out, and argon is introduced for protection in the whole process; S4, the surface of the sintered sample is polished to be bright on abrasive paper, and the sample is placed in deionized water of a constant-temperature water bath to be soaked in water; and S5, the sample soaked in water continues to be subjected to dealloying treatment with hydrochloric acid under the condition of the constant-temperature water bath, dealloying is completed when no obvious bubbles escape, and then composite porous copper with two-stagemicron-pores and single-stage nano-pores is obtained. The preparation method is beneficial for providing a larger specific surface area and improving the catalytic performance of a porous material.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanoporous metal materials, and in particular relates to a micronano graded porous copper and a preparation method of the micronano graded porous copper. Background technique [0002] Due to their low density, high porosity and high specific surface area, porous materials exhibit special physical, chemical and mechanical properties, so they are widely used in many fields such as catalysis, sensing, energy, fuel cells and surface-enhanced Raman scattering. Show great application potential. Materials with hierarchical pore diameters can further improve their properties such as specific surface area and porosity, so it is very important to prepare hierarchical porous materials with uniform and controllable pore diameters. The preparation methods of micro-nano hierarchical porous metals include solid-gas eutectic directional solidification, percolation casting method, hydrogen template method,...

Claims

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Application Information

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IPC IPC(8): C22C1/08C22C3/00C22C9/00
CPCB22F3/1134C22C3/00C22C9/00
Inventor 杨卿雷欢夏天洗孙少东梁淑华
Owner XIAN UNIV OF TECH
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