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A method for preparing metal honeycomb material by low-pressure injection molding

An injection molding, metal honeycomb technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of low mechanical/laser drilling processing efficiency, insufficient reliability of honeycomb structure, limited thickness of parts, etc., and achieve accurate process parameters Reliable, low cost, reduced pressure requirements

Active Publication Date: 2021-09-10
SHANGHAI RES INST OF MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the efficiency of mechanical / laser drilling is low, and the thickness of parts is also limited; powder dry pressing can only manufacture parts with relatively simple shapes; metal foil tape winding and metal fiber weaving involve many processes, high cost and insufficient reliability of honeycomb structure; Plastic extrusion can only form structures with flat ends; metal injection molding can produce small and complex structural parts, but is subject to high raw material costs; 3D printing can produce complex structural parts, but the manufacturing cycle is long and the cost is high. Currently, large-scale applications still restricted

Method used

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  • A method for preparing metal honeycomb material by low-pressure injection molding
  • A method for preparing metal honeycomb material by low-pressure injection molding
  • A method for preparing metal honeycomb material by low-pressure injection molding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: Preparation of FeCrAl metal honeycomb body

[0043] (1) Mixing; heat the paraffin to 120°C, slowly add ethylene vinyl acetate and stearic acid, and mix thoroughly with mechanical stirring. The quality of the binder is composed of 83 parts of paraffin, 15 parts of ethylene-vinyl acetate, and 2 copies;

[0044] The FeCrAl pre-alloyed powder (<45μm) was heated to 100°C and then mechanically mixed with 20% of the total weight of the binder for 5min.

[0045](2) Molding: FeCrAl powder-binder mixed raw materials are added to a low-pressure injection molding material cylinder, vacuumized after sealing, heated to 110°C, and mechanically stirred for 30 minutes.

[0046] The slurry is injected into the mold under the pressure of 0.7MPa to make the honeycomb green body.

[0047] (3) Degreasing: take out the green honeycomb and put it into a dichloromethane solution, soak it at 40°C for 12h, take it out, and dry the residual solvent at 90°C.

[0048] (4) Thermal de...

Embodiment 2

[0053] Example 2: Preparation of 304 stainless steel metal honeycomb body

[0054] (1) Mixing: heat the paraffin to 120°C, slowly add low-density polyethylene and stearic acid and mix thoroughly, the quality of the binder is composed of 74 parts of paraffin, 22 parts of low-density polyethylene, and 4 parts of stearic acid;

[0055] 304 stainless steel pre-alloyed powder (<45μm) was heated to 100°C, and then pre-mixed with 15% of the total weight of binder for 5 minutes.

[0056] (2) Molding: Add 304 stainless steel powder-binder mixed raw materials into the low-pressure injection molding material cylinder, vacuumize after sealing, heat to 110°C, and mechanically stir for 30 minutes.

[0057] The slurry is injected into the mold under the pressure of 1.0MPa to make the honeycomb green body

[0058] (3) Degreasing: take out the honeycomb blank and put it into trichlorethylene solution, soak it at 45°C for 15h, take it out, and dry the residual solvent at 90°C.

[0059] (4) Th...

Embodiment 3

[0062] Embodiment 3: Preparation of FeCrAl metal honeycomb body

[0063] (1) Mixing: Premix the binder (70 parts of paraffin wax, 25 parts of ethylene-vinyl acetate and 5 parts of stearic acid) and heat it to melt, then preheat the metal powder (particle size smaller than 45μm FeCrAl heat-resistant alloy powder) was poured into the molten binder and stirred thoroughly to obtain a uniform powder-binder mixed raw material, in which the mass ratio of metal powder to binder was 9:1.

[0064] (2) Molding: the powder-binder mixed raw material is obtained by low-pressure injection molding to obtain a porous honeycomb blank; the process conditions of the low-pressure injection molding are: temperature 90°C, pressure 0.5MPa; mechanical stirring is used to strengthen the slurry during the injection molding process The uniformity of the material, the rotation speed is 500r / min, and it is supplemented by vacuum degassing to eliminate the gas in the slurry.

[0065] (3) Degreasing: fully ...

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Abstract

The invention relates to a method for preparing metal honeycomb material by low-pressure injection molding. The process steps are: mixing metal powder and binder, low-pressure injection molding, solution dewaxing, thermal debonding and sintering in vacuum or protective atmosphere, and the integral metal honeycomb material can be produced. Compared with the prior art, the technology of the present invention has the advantages of wide particle size range of raw material powder, low injection pressure, large product list, simple process flow, high production efficiency, low cost and easy mass production.

Description

technical field [0001] The invention relates to the field of preparation of porous metal materials, in particular to a method for preparing metal honeycomb materials by low-pressure injection molding. Background technique [0002] Metal honeycomb material is a functional composite material that integrates metal properties (thermal conductivity, electrical conductivity, toughness, thermal shock resistance) and macroscopic structural properties (high specific surface area), especially suitable for automobile and motorcycle exhaust gas purification treatment, high-temperature furnace exhaust gas Structural materials for purification treatment, high-efficiency heat dissipation, heat exchangers, etc. Since the shape structure and mechanical bending strength of metal honeycomb materials are important assessment indicators, if there is a manufacturing method that can not only ensure the shape structure but also improve the mechanical bending strength, then the comprehensive perform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/22B22F3/11B22F1/00
CPCB22F3/225B22F3/11B22F2998/10B22F1/103B22F1/10
Inventor 孙继锋杨良良杨旗
Owner SHANGHAI RES INST OF MATERIALS CO LTD
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