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Preparation method of light-weight intermetallic compound based layered composite material

A technology of intermetallic compounds and composite materials, which is applied in the field of preparation of composite materials, can solve problems such as poor production safety, environmental impact, and large smog, and achieve the effects of high hardness, high interface bonding strength, and low density

Inactive Publication Date: 2014-02-12
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the advantages of low cost, strong flexibility, and simple operation, but its disadvantages are also very prominent, that is, metals with high strength and low toughness are prone to brittle cracks at room temperature due to their low welding strength. Loud noise and smog, poor production safety, and serious impact on the environment

Method used

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  • Preparation method of light-weight intermetallic compound based layered composite material
  • Preparation method of light-weight intermetallic compound based layered composite material
  • Preparation method of light-weight intermetallic compound based layered composite material

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0039] Pretreatment of the surface of the raw material: Choose Ti foil and Al foil with thicknesses of 520μm and 620μm, and cut the metal foil into 100mm×100mm squares for surface pretreatment. First, use sandpaper to clean the surface of Ti foil and Al foil. Polish to remove the oxide scale on the surface until the fresh surface is exposed, and then treat the polished Ti foil and Al foil with ultrasonic for 15-20 minutes. Finally, clean the surface with alcohol to remove the remaining oxide particles and impurities, and then air dry. Put it into the drying dish to be processed.

[0040] The two foils are overlapped with each other. The number of layers of Ti foil and Al foil is 14 and 13 respectively, and the outermost layer is Ti foil, and the final number of layers is 27. See the attached figure 1 .

[0041] Put the above-mentioned metal foil laminate into a graphite mold in a vacuum hot pressing furnace for vacuum hot pressing and sintering. The background vacuum degree is 6.67...

example 2

[0044] Compared with Example 1: The surface pretreatment process of the material and the composition of the material, the thickness of the layer, the number of layers and the stacking method are exactly the same, but the process parameters of the vacuum hot pressing are different.

[0045] The vacuum hot pressing process of Example 2 is shown in the attachment Figure 5 :The background vacuum is 6.67×10 -3 Pa, heat up to 640°C at a heating rate of 10°C / min for 1 hour, then heat up to 675°C at a heating rate of 3.5°C / min, hold for 1 hour, and then heat to 685°C / min at a heating rate of 1°C / min, Keep for 7h. During the heating process and the 640°C holding stage, a pressure of 4MPa was applied. During the 675°C holding stage and the 685°C holding stage, the pressure was not applied for the first 2 hours, and the pressure was applied at the last 5 hours of the 685°C holding stage.

[0046] This sintering and 40%Ti / Al 3 The difference in Ti sintering process is that the holding time is...

example 3

[0049] Compared with Example 1: The surface pretreatment process of the metal foil is exactly the same, and the composition of the original material remains unchanged. The thickness of the Ti foil remains unchanged. The thickness of the Al foil used is 840μm. The number of Ti foil and Al foil is adjusted to 13 and 12 respectively. The surface-treated metal foils are overlapped and the outermost end is Ti layer.

[0050] The heat treatment process used in Example 3 is the same as that in Example 2, and the process parameters are shown in the attachment Figure 5 .

[0051] For the microstructure of the composite material prepared in Example 3, see attached Figure 7 . After measurement, Ti layer and Al 3 The thickness of the Ti layer is 240μm and 960μm, and the volume percentage of the reinforcement Ti in the composite material is 20%. This sample is named 20%Ti / Al 3 Ti. The composite material after the hot-pressing treatment was subjected to a compression experiment, and the mech...

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Abstract

The invention provides a preparation method of a light-weight intermetallic compound based layered composite material. The preparation method comprises the following steps: with Ti foil and Al foil as raw materials, alternately stacking the pretreated Ti foil and Al foil, keeping the Ti foil at the outmost layer, and carrying out vacuum hot pressing treatment under the conditions that the base pressure is 6.67*10<-3>Pa, the reaction temperature is 640-685 DEG C, the heating rate is 1-10 DEG C / min, the applied pressure is 0-4MPa, and the temperature preservation time is 1-10h. According to the preparation method, the mutually stacked Ti foil and Al foil are subjected to diffusion reaction by using a vacuum hot pressing method to generate an intermetallic compound Al3Ti, and the intermetallic compound Al3Ti and the residual Ti layer are formed into a layered composite material with a Ti layer as a reinforcement body. The intermetallic compound Al3Ti has high strength and hardness, low density and higher fragility, while the Ti layer is the reinforcement body with better toughness, so that the obtained intermetallic compound based layered composite material has high toughness on the basis of high strength.

Description

Technical field [0001] The invention relates to a method for preparing composite materials, in particular to a method for preparing lightweight and high-performance Ti / Al by metal foil metallurgy 3 Ti layered composite material method. Background technique [0002] Biological research shows that the main component of shells is CaCO 3 However, this low-strength and high-brittle material exhibits excellent high strength and high toughness on the shell. Discovered by studying the structure of shells: CaCO in shells 3 It is distributed in layers, and the gaps are tightly filled with organic matter. It is this layered structure that makes it have good mechanical properties. Therefore, people designed and prepared this kind of layered composite material with shell structure based on bionics, such as a new type of intermetallic compound-based layered composite material Ti / Al 3 Ti. With other intermetallic compounds (such as TiAl, Ti 3 Al, etc.) Compared to Al 3 Ti has the smallest dens...

Claims

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Application Information

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IPC IPC(8): C22F1/18C22F1/04C22F1/02B32B37/10B32B15/01
Inventor 姜风春常云鹏党超果春焕哈金奋张密林
Owner HARBIN ENG UNIV
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