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Preparation method of metal matrix composite

A composite material and metal-based technology, which is applied in the field of preparing composite materials and metal-based composite materials, can solve the problems of sweating molten metal, sintered non-dense products of large size, deformation of sintered products, etc., and achieves the effect of improving wettability

Inactive Publication Date: 2013-03-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The powder metallurgy method mainly includes three basic processes of mixing, pressing, and sintering. Metal matrix composites are prepared by powder metallurgy. In most cases, liquid phase sintering is used. The sintering temperature is relatively close to the melting point of the metal, which is prone to deformation of sintered products and sintering of large-scale products. Non-dense phenomenon, when the wettability of the metal and ceramic phases is poor, there will also be phenomena such as "sweating" and loss of molten metal during the sintering process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Implementation example 1: Fe-Cr-C alloy powder infiltration Ni-Ti-TiC porous framework

[0018] 1. Weigh 100g TiC-10Ni-50Ti mixed powder (average particle size 50μm, particle size less than 100μm), add 60g sucrose powder (average particle size 150μm, particle size less than 300μm), mix evenly to prepare mixture;

[0019] 2. Use the gel injection molding toluene-HEMA gel system to mold the mixture into a body with a specified shape, and then dry it for 6~8 hours to prepare a prefabricated body with a porous skeleton.

[0020] 3. Weigh 370g of electrolytic iron powder, 12.5g of graphite powder, and 10g of chromium powder by high-energy vibration ball milling for 8 hours, using absolute ethanol as the medium, and then dry and sieve to prepare alloy powder.

[0021] 4. Put the alloy powder and porous skeleton prefabricated body into a ceramic crucible, heat and infiltrate in a vacuum furnace, keep it at 1400°C for 2 hours, and finally prepare a metal matrix composite materi...

Embodiment 2

[0022] Implementation example 2: Fe-Cr-C alloy powder infiltration Ni-Ti-WC porous framework

[0023] 1. Weigh 100g WC-10Ni-50Ti mixed powder (average particle size 50μm, particle size less than 100μm), add 55g sucrose powder (average particle size 150μm, particle size less than 300μm), mix evenly to prepare mixture;

[0024] 2. Use the gel injection molding toluene-HEMA gel system to mold the mixture into a body with a specified shape, and then dry it for 6~8 hours to prepare a prefabricated body with a porous skeleton.

[0025] 3. Weigh 450g of electrolytic iron powder, 12.5g of graphite powder, and 13g of chromium powder by high-energy vibration ball milling for 8 hours, use absolute ethanol as the medium, then dry and sieve to prepare alloy powder.

[0026] 4. Put the alloy powder and porous skeleton prefabricated body into a ceramic crucible, heat and infiltrate in a vacuum furnace, keep it at 1370°C for 2 hours, and finally prepare a metal matrix composite material in wh...

Embodiment 3

[0027] Implementation example 3: Fe-Cr-C alloy powder infiltration Ni-Ti-Al 2 o 3 Porous skeleton

[0028] 1. Weigh 100g Al 2 o 3 -10Ni-50Ti mixed powder (average particle size 50μm, particle size less than 100μm), add 42g sucrose powder (average particle size 150μm, particle size less than 300μm), mix evenly to prepare mixture;

[0029] 2. Use the gel injection molding toluene-HEMA gel system to mold the mixture into a body with a specified shape, and then dry it for 6~8 hours to prepare a prefabricated body with a porous skeleton.

[0030] 3. Weigh 410g of electrolytic iron powder, 12.5g of graphite powder, and 11g of chromium powder by high-energy vibration ball milling for 8 hours, use absolute ethanol as the medium, then dry and sieve to prepare alloy powder.

[0031] 4. Put the alloy powder and porous skeleton prefabricated body into a ceramic crucible, heat and infiltrate in a vacuum furnace, keep it at 1410°C for 2 hours, and finally prepare TiC and Al 2 o 3 Meta...

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PUM

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Abstract

The invention provides a preparation method of a metal matrix composite and belongs to the field of preparation of structural materials. Compared with a traditional powder metallurgy process, the method provided by the invention has the following advantages: (1) a series of complex process such as pressing, degumming, sintering and the like in traditional powder metallurgy can be omitted; and (2) by virtue of the induction actions of capillary force and Ti-C reaction, the wetting property of molten metal and a ceramic phase can be improved, and phenomena such as sweating, loss of the molten metal and the like caused by poor wetting property of the metal and ceramic phase in a powder metallurgy sintering process do not exist. The method is characterized in that a porous framework is prepared by adopting a gel casting and carbohydrate body pore-forming method, so that the interior of the porous framework is provided with air holes which are totally communicated, and the porosity is 70-80%; in an infiltration process, various C-containing metal powder, comprising iron powder, nickel powder, cobalt powder and other alloy powder, can be adopted; and finally, the metal matrix composite with TiC generated in situ and the ceramic phase dispersed in a metal matrix can be prepared. The preparation method provided by the invention is low in technical cost and simple in process and can be used for preparing large-szie and complex-shape products; and the finished product can maintain the shape of the porous framework and can be subjected to net size molding.

Description

technical field [0001] The invention relates to a metal-based composite material preparation technology, which belongs to the field of structural material preparation, and especially provides a new technology for preparing composite materials with low cost, simple process and industrialization. Background technique [0002] Metal matrix composites have the advantages of light weight, high strength, and good wear resistance and heat resistance. They are advanced engineering materials and are increasingly widely used in high-tech fields such as aerospace, automobiles, and bioengineering. However, the difficulty of its production process is that many metals and their alloys are almost non-wetting with the reinforcement, which makes the preparation process more demanding. After more than ten years of development, the relatively mature methods mainly include powder metallurgy, squeeze casting, and semi-solid mixing. The powder metallurgy method mainly includes three basic proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C32/00C22C1/05
Inventor 郭志猛石永亮方哲成
Owner UNIV OF SCI & TECH BEIJING