Method for improving pore-forming efficiency of metal sublimation pore-forming method based on element reaction/diffusion principle

A pore-making and element-making technology, which is applied in the field of improving the pore-making efficiency of the "metal sublimation pore-making method" based on the principle of element reaction/diffusion, can solve the problems of increasing furnace pressure, furnace and vacuum pump pollution, and reducing furnace service life.

Inactive Publication Date: 2020-10-23
WUHAN UNIV OF TECH
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Problems solved by technology

However, this method also has certain disadvantages, that is, in a vacuum-tight environment, the sublimated metal vapor in the compact will continue to sublimate, which will increase the furnace pressure, making the pressure of the metal gas approach the saturated vapor pressure continuously. When the two are equal, the metal Sublimation and desublimation reach a dynamic balance, which inhibits the sublimation of metal elements in the sample, resulting in a serious decrease in pore-forming efficiency
In addition, metal gas diffusion will also pollute the furnace and vacuum pump
Even, the active metal vapor will react with the inner wall of the furnace and its heating element, reducing the service life of the furnace

Method used

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  • Method for improving pore-forming efficiency of metal sublimation pore-forming method based on element reaction/diffusion principle

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] High-purity iron powder is used as the raw material, and high-purity manganese powder with high sublimation characteristics is selected as the pore-forming element. The high-purity iron powder and manganese powder are mixed at a mass ratio of 50:50. The particle sizes of the selected iron powder and manganese powder are about 35 μm. The uniformly mixed powders were pressed into billets under a pressure of 300 MPa by compression molding, and a batch of samples to be formed with a diameter of 20 mm and a height of 0.5 mm were obtained. Put the sample to be pore-forming into the sintering chamber of the vacuum sintering furnace, then install a metal vapor absorption stage in the sintering chamber, add iron powder and manganese powder on the sample stage 1 to make the pore-forming sample pressed by iron powder and manganese powder. A plurality of compacted pure silicon powder compacts with a diameter of 20 mm and a thickness of 0.2 mm are added to the stage 2 as reactants f...

Embodiment 2

[0026] High-purity iron powder is used as the raw material, and high-purity zinc powder with high sublimation characteristics is selected as the pore-forming element. The high-purity iron powder and zinc powder are mixed at a mass ratio of 60:40. The particle sizes of the selected iron powder and zinc powder are about 40 μm. After mixing evenly, it is vacuum smelted and cast into a cylindrical sample with a diameter of 20 mm. After the homogenization annealing treatment, the Fe-Zn alloy was cut into thin slices with a thickness of 0.2mm by wire electric discharge cutting equipment, and two slices of the cut zinc-iron alloy slices were taken out and put into the sintering chamber of the vacuum air quenching furnace. Then install the metal vapor absorption stage in the sintering chamber, add the sliced ​​zinc-iron alloy on the sample stage 1, add a plurality of pressed pieces with a diameter of 20mm and a thickness of 0.2mm on the reactant stage 2 A compact of pure copper powde...

Embodiment 3

[0028] High-purity iron powder is used as the raw material, and high-purity magnesium powder with high sublimation characteristics is selected as the pore-forming element. The high-purity iron powder and magnesium powder are mixed at a mass ratio of 50:50. The particle size of the selected iron powder and magnesium powder is about 35 μm. The uniformly mixed powders were pressed into billets under a pressure of 300 MPa by compression molding, and a batch of samples to be formed with a diameter of 20 mm and a height of 0.5 mm were obtained. Put the sample to be pore-forming into the sintering chamber of the vacuum sintering furnace, then install a metal vapor absorption stage in the sintering chamber, add the sample to be pore-forming pressed by iron powder and magnesium powder on the sample stage 1, and in the reactant A plurality of compacted niobium pentoxide compacts with a diameter of 20 mm and a thickness of 0.2 mm are added to the stage 2 as reactants for the reaction with t...

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Abstract

The invention discloses a method for improving pore-forming efficiency of a metal sublimation pore-forming method based on an element reaction/diffusion principle. The method comprises the following steps of a, adding one or more metal pore-forming elements easy to sublimate in a certain proportion into a sample to be pore-formed in a preparation process, and putting the sample into a hearth of ahigh vacuum furnace after preparation; b, installing a vapor absorption objective table in a sintering chamber, and adding a pressed reactant capable of reacting with the sublimating metal elements onthe vapor absorption objective table; and c, sintering the sample in the sintering furnace with high vacuum degree to form holes inside and on the surface of the sample. The sublimated metal vapor reacts with the reactant on the vapor absorption objective table, so that the reaction process is accelerated, the pore formation efficiency is improved, and a porous material with high porosity is obtained. The method has the characteristics of simple process, low cost, high universality and the like, and can be widely applied to the field of preparing porous materials by using the metal pore-forming elements easy to sublimate.

Description

technical field [0001] The invention relates to the field of porous material preparation, in particular to a method for improving the pore-making efficiency of the "metal sublimation pore-making method" based on the element reaction / diffusion principle. Background technique [0002] Porous materials are developing rapidly. With the advancement of science and technology and technological innovation, foamed aluminum, foamed nickel and foamed steel and other foamed metal materials and porous ceramic materials have appeared one after another. These materials are widely used in various important fields of the national economy due to their excellent physical and chemical properties. . As a structural material, porous metal materials have the characteristics of low density, high specific strength and high porosity, and are widely used in the automobile industry, shipbuilding industry, energy absorption and vibration isolation of buildings and bridges; as functional materials, porou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/11C22C1/08
CPCB22F3/1134C22C1/08
Inventor 徐志刚梁金荣王传彬沈强
Owner WUHAN UNIV OF TECH
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