Three-dimensional through-hole or part-hole interconnecting porous metal foam and its preparing method

A three-dimensional through-hole, metal foam technology is applied in the field of porous metal foam materials and their preparation, which can solve the problems of combustion, filter materials cannot be recycled, polluted alloy melts, etc.

Inactive Publication Date: 2007-03-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carrier has the advantages of large specific surface area and good heat resistance, but it has fatal defects of large heat and low thermal conductivity. Within 1 to 3 minutes after starting, its purification effect is quite limited. In addition, it also has the defects of being fragile, unable to resist shearing, bending and stretching; (3) metal carrier
The metal carrier has the advantages of large specific surface area, strong shock resistance, fast ignition speed and small back pressure, but the current metal carrier is generally made of corrugated metal foil and flat metal foil stacked together. The honeycomb overall structure made by this structure cannot meet the filter performance requirements for particles
[0003] In the current silicothermal magnesium smelting process, since the surface of the pellets entering the reduction tank inevitably contains free dust, the main components of the dust are CaO, MgO and Si-Fe, the most harmful of which is Si dust, which enters the magnesium After the vapor condensation zone, it is easy to generate Mg 2 Si, this alloyed Mg 2 Si is difficult to remove during the refining of crude magnesium, which will lead to a decrease in the grade of metallic magnesium
Therefore, it is of great significance to filter dust during vacuum thermal red

Method used

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  • Three-dimensional through-hole or part-hole interconnecting porous metal foam and its preparing method
  • Three-dimensional through-hole or part-hole interconnecting porous metal foam and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0035] Preparation of three-dimensional through-hole 316L stainless steel foam with good oxidation resistance and particle trapping performance According to the process shown in Figure 1, three-dimensional through-hole stainless steel foam was prepared.

[0036] Step 1: Preparation of Green Body Precursor

[0037] ① Weigh the raw materials according to the ratio in Table 1, and mix and stir the raw materials in a mixer for 60 minutes to prepare a slurry;

[0038] Table 1 Raw material ratio of precursor slurry

[0039] raw material

Mass percentage (%)

Polyvinyl Alcohol Sol (10%)

Stainless steel powder (316L, 400 mesh)

22

78

[0040] ②Immerse a polyurethane sponge with a sponge foam specification of 20ppi and a diameter of 0.3mm in 10% NaOH solution for 2-4 hours, and then scrub it with clean water to make it hydrophilic;

[0041] ③Immerse the treated polyurethane sponge in the slurry for a period of time, and then squeeze it on the ro...

Embodiment approach 2

[0054] Three-dimensional through-hole 316L / Cr with good high temperature oxidation resistance 2 C 3 Foam Metal Preparation The porous foam material was prepared according to the process flow shown in Fig. 1 .

[0055] Step 1: Preparation of Green Body Precursor

[0056] ① Weigh the raw materials according to the ratio in Table 3, and mix the raw materials in the mixer for 60 minutes to prepare the slurry;

[0057] ②Immerse a polyurethane sponge with a sponge foam specification of 50ppi and a diameter of 0.3mm in 10% NaOH solution for 2-4 hours, and then scrub it with clean water to make it hydrophilic;

[0058] ③Immerse the treated polyurethane sponge in the slurry for a period of time, and then squeeze it on the roller machine to squeeze out the excess slurry; in order to ensure that the slurry is evenly distributed on the sponge foam and reduce hole plugging, this Carried out 5 times of roller extrusion in the embodiment; Adopted roller equipment as shown in Figure 3.

...

Embodiment approach 3

[0066] Preparation of TiAl / 316L Microporous Material

[0067] Prepared according to the process flow shown in Figure 2.

[0068] Select the raw materials in Table 4, use industrial alcohol as dispersant, polyvinyl alcohol as binder, mix in a cylinder mixer for 4 hours, then dry at 80°C, and cold isostatic press the mixed powder at 200Mpa into a green body. The obtained green body is first degreased in a vacuum furnace, and then raised to 1250°C according to a certain heating system for vacuum sintering (vacuum degree is 10 -2 pa), so that a porous material with silver-gray metallic luster can be obtained. The obtained porous material has an open porosity of 46.94%, and its closed porosity is less than 2.5%.

[0069] The material has almost no oxidation in the air at 800°C; it has been soaked in an acidic solution with a pH value of 2 for 24 hours, and no corrosion phenomenon has been found; it contains 2wt% SiO 2 After the aluminum melt was filtered through the microporous...

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Abstract

The invention relates to a multi-hole foamed metal material and the manufacturing method. It includes the following steps: equally dispersing metal or alloy powder that has the particle diameter at 1-100um into solution contains adhesive agent to make slime, pouring the slime into through-hole polyurethane sponge foam, after taking drying and sintering, the material would be gained. It also could be make by the method of directly isostatic cool pressing one or more metal or alloy powder, isostatic cool pressing after mixing with pore forming material or isostatic cool pressing after mixing with adhesive agent solution to gain green pressing that would be sintered in vacuum furnace to make the material. The invention could be used to process vehicle tail gas and could also be used to filter the smoke form thermal power station or metallurgical furnace.

Description

[technical field] [0001] The invention relates to a porous metal foam material for filtering dust or particles and a preparation method thereof. [Background technique] [0002] Exhaust gas from automobiles and flue gas from thermal power plants and metallurgical furnaces contain a large amount of harmful dust such as lead compounds and soot, as well as harmful exhaust gases such as carbon monoxide, hydrocarbons, nitrides, and sulfur dioxide. These harmful dust and Exhaust gas has polluted the human living environment. In the treatment of flue gas, dry methods such as bag dust collection, electric dust collection and cyclone dust collection are usually used, or wet methods such as water film, water bath and Venturi are used for dust collection. However, the temperature of exhaust gas treated by conventional dust collection is required to be below 500°C, and conventional dust collection cannot catalytically decompose exhaust gas, let alone filter and catalytically decompose a...

Claims

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Application Information

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IPC IPC(8): C22C1/08B22F3/16
Inventor 周向阳李劼丁凤其刘宏专龙波
Owner CENT SOUTH UNIV
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