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Porous powder and preparation method thereof

A technology of porous powder and powder, which is applied in the field of dual-phase or multi-phase alloy powder and its preparation method, can solve the problems that the properties cannot be applied to other materials, the reaction temperature is low, and the porous structure is affected. The effect of high specific surface area and simplified process

Inactive Publication Date: 2011-05-04
IND TECH RES INST
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Problems solved by technology

Japanese Patent No. 2008050237 discloses a method for preparing spherical porous carbon powder. In this method, carbon powder and acetaldehyde are added to an aqueous solution to carry out a polymerization reaction. After the reaction, solid-liquid separation is performed, and the powder is taken out and dried, and then It is placed in an inert gas for heat treatment at 500 to 1000°C to make it carbonized, and finally activated to make porous carbon powder, but this method is only applicable to organic materials such as carbon powder
Japanese Patent No. 2005002395 discloses a method for preparing porous nickel powder by a two-stage reaction method. In this method, the nickel compound is first placed in an oxidizing atmosphere. In the first stage, the temperature is raised to 300 to 500°C. The stage rises to 800 to 1300°C, and after the metal oxide is formed on the surface, the oxide is reduced in a reducing atmosphere to make porous nickel powder, but this method is mainly aimed at the preparation of nickel powder
Japanese Patent No. 2007099621 discloses a method for preparing porous silica powder. In this method, the silica powder is heated to 1100 to 1600°C in vacuum or inert gas to generate silicon oxide vapor, and then the silicon oxide vapor is Evaporate on a cold body with a temperature of about 100 to 400°C, and control it so that the specific surface area is about 5 to 300m 2 / g of porous silica powder, but this method is mainly only applicable to high vapor pressure materials
Chinese Patent No. 101177296 discloses a method for preparing zinc oxide nanopowder with sheet-like porous structure. In this method, the mixture of zinc acetate solution and urea solution is placed in a microwave oven and reacted for 30 to 60 minutes at a power of 500 to 900W. Minutes, the reaction temperature is about 60 to 95 ° C, and then the resulting mixed solution is separated, washed, and dried to make a precursor of basic zinc carbonate, and then the precursor is fired at 400 to 600 ° C, that is Porous nano-zinc oxide powder can be obtained, but the reaction temperature of this method is low, which may affect the obtained porous structure
[0005] In summary, the current development direction of porous materials is mostly focused on using grinding methods to grind porous materials to make porous particles, or to prepare porous powders for specific materials, but these methods not only increase the number of process steps And the cost is also limited by the nature and cannot be applied to other materials for mass production, which is not economically beneficial

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Embodiment 1

[0060] refer to figure 1 In the nickel-silicon equilibrium phase diagram shown, the vertical axis represents temperature (° C.), the upper horizontal axis represents the atomic ratio of silicon, and the lower horizontal axis represents the weight ratio of nickel to silicon. After two elements of nickel and silicon are selected in the equilibrium phase diagram, the atomic ratio of nickel and silicon is nickel: when silicon is 1:2 (if falling in figure 1 The dotted line marked L) has nickel disilicide (NiSi 2 ) intermetallic compound phase, so when the weight ratio of nickel and silicon is adjusted to 45:55, two different phase alloy powders of pure silicon and nickel disilicide can be produced. Place the selected elements in the silicon carbide crucible of the gas spray pulverizer, use a mechanical pump to pump the vacuum of the cavity below about 10-1 Torr (torr), and then according to the phase diagram, Si 55 Ni 45 The melting point is about 1185°C (if falling in figure 1...

Embodiment 2

[0063] refer to Figure 4 In the equilibrium phase diagram of gold indium shown, the vertical axis represents temperature (° C.), the upper horizontal axis represents the atomic ratio of indium, and the lower horizontal axis represents the weight ratio of indium. After two elements of gold and indium are selected in the equilibrium phase diagram, according to the atomic ratio of gold and indium, gold: indium is 1:2, and gold diindium (AuIn 2 ) intermetallic compound phase, so when the weight ratio of indium and gold is adjusted to 90:10, pure indium and AuIn can be produced 2 Alloy powder of two different phases. Place the selected elements in the gas spray mill, and use a mechanical pump to draw the vacuum of the cavity to about 10 -1 Below torr, use the cycle induction method to start increasing the cycle power for heating, raising the temperature to 500°C, melting the indium and gold, pouring the indium and gold into the funnel (Tundish) after they are completely melted, ...

Embodiment 3

[0066] refer to Figure 5 In the copper-magnesium equilibrium phase diagram shown, the vertical axis represents temperature (° C.), the upper horizontal axis represents the atomic ratio of magnesium, and the lower horizontal axis represents the weight ratio of magnesium. After selecting copper and magnesium in the equilibrium phase diagram, according to the atomic ratio of copper and magnesium, copper: magnesium has a copper dimagnesium (CuMg 2 ) intermetallic compound phase, so when the weight ratio of copper and magnesium is adjusted to 10:90, pure magnesium and CuMg can be produced 2 Alloy powder of two different phases. Place the selected elements in the gas spray mill, and use a mechanical pump to draw the vacuum of the cavity to about 10 -1Below torr, use the cycle induction method to start increasing the cycle power to heat up to 650°C to melt the copper and magnesium. After the copper and magnesium are completely melted, pour them into the funnel (Tundish), and then ...

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Abstract

The invention discloses a preparation method of porous powder, comprising the following steps: melting at least two elements at a blended ratio into a melting liquid with at least two phases; pelleting the melting liquid into powder pellets of at least two phases; and performing acid etching on the powder pellets to cause one of the at least two phases to be corroded and lead the pellets in the corroded phase to extend from the surfaces to the insides to form holes, thus obtaining the porous powder. As for the porous powder prepared by the invention, the surface of each pellet is provided with multiple holes, and the holes extend to the inside of the pellet, thus having high specific surface area, and being applicable to the fields of energy storage, chemical absorption materials or catalysts, and the like.

Description

【Technical field】 [0001] The present invention relates to a porous material and its preparation method, especially to a dual-phase or multi-phase alloy powder and its preparation method. The surface of the powder particle is formed with a plurality of holes extending from one of the phases to the interior of the particle. 【Background technique】 [0002] With the vigorous development of energy and chemical industries, the requirements for the characteristics of functional materials are gradually increasing. Due to the special structure and high specific surface area of ​​porous materials, they are widely used in energy storage, chemical adsorption materials, electrode materials, catalysts, electromagnetic waves There are more and more applications in absorption, filters, etc. Porous materials include various pure elements, alloys, and compounds of different compositions. After being made into porous powder structures, they all exhibit different characteristics and have many u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08
Inventor 曹申萧达庆
Owner IND TECH RES INST