MAX-phase ceramic-magnesium or magnesium alloy composite material and preparation method thereof

A composite material and magnesium alloy technology, applied in the field of MAX phase ceramic-magnesium or magnesium alloy composite material and its preparation, can solve the problems of mechanical property influence, uneven dispersion, long production cycle, etc., and achieve the improvement of mechanical properties and the preparation method Simplicity and high productivity

Inactive Publication Date: 2021-07-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventors of the present invention have found that the above-mentioned technology has at least the following technical problems: (1) the above method needs to be opened for the second time during the operation (that is, after the magnesium or magnesium alloy is heated to a semi-solid state, the furnace needs to be opened again to add MAX Phase ceramic powder), heating and heating for many times, the prepared material still needs further mechanical processing or deformation treatment, which makes the preparation production cycle long, low efficiency, numerous preparation steps, complicated process and large energy waste, etc.
(2) The above method adds ceramic powder to semi-solid magnesium or magnesium alloy and stirs it, but this addition is not unlimited. Adding too much will make the powder in the semi-solid magnesium or magnesium alloy Clusters gather, disperse unevenly, and form defects. Therefore, the volume content of MAX phase ceramics in the composite materials prepared by the prior art is low, basically 5-30%, and it is not easy to adjust, so that the hardness, strength, wear resistance Cannot meet the requirements of most practical applications
(3) The composite material is prepared by the traditional mechanical stirring method, the ceramic phase and the metal phase cannot be uniformly dispersed, the interface between the two is weak, the ceramic phase is blocked by the metal, and the connectivity is poor, which affects the mechanical properties

Method used

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  • MAX-phase ceramic-magnesium or magnesium alloy composite material and preparation method thereof
  • MAX-phase ceramic-magnesium or magnesium alloy composite material and preparation method thereof
  • MAX-phase ceramic-magnesium or magnesium alloy composite material and preparation method thereof

Examples

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Effect test

preparation example Construction

[0048] The preparation of the MAX phase ceramic body can be made by cold pressing or grouting according to actual needs. Specifically, in the step of cold press forming: the pressure of press forming is 3-10 MPa, and the holding time is 0.1-2h. Specifically, in the slip casting step: deionized water is used as a dispersant, and the Ti 2 AlC or Ti 3 AlC 2 The powder accounts for 40-70% of the total mass of the slurry.

[0049] Specifically, the set temperature during sintering is 750-1200°C, and the first set time is 0.5-2h. The set temperature for high temperature infiltration is 750-900°C, which should be higher than the melting point of Mg and Mg alloy, and the second set time is at least 5 minutes.

[0050] For the above scheme, Ti can be directly 2 AlC or Ti 3 AlC 2 The powder is put into a graphite mold (or graphite crucible), and then the graphite mold is placed on the base of the furnace cavity of the heating furnace, directly sintered into a sintered block, and ...

Embodiment 1

[0055] This embodiment provides a Ti 2 The preparation method of AlC-Mg composite material, adopted raw material comprises Ti 2 AlC powder and Mg block. Among them, the present embodiment prepares Ti 2 For the process principle of AlC-Mg composite materials, see figure 1 As shown, and in the preparation process, the program control temperature-time curve set on the heating furnace is as follows figure 2 As shown, the specific preparation steps are as follows:

[0056] Preparation of Ti 2 AlC green body step: 20gTi 2 AlC powder is put into the mold evenly. Then adjust the stroke of the hydraulic press to the fully open state, and the Ti 2 The mold of AlC powder is placed in the center of the hydraulic press, pressurized to 4MPa and then the pressure is released, and then the upper mold base is adjusted to completely open the hydraulic press, and the mold and Ti are taken out. 2 AlC body.

[0057] Feeding step: Ultrasonic cleaning the graphite crucible in absolute etha...

Embodiment 2

[0062] This embodiment provides a Ti 3 AlC 2 -The preparation method of Mg alloy composite material, wherein, the difference between the preparation method of this embodiment and embodiment 1 is as follows:

[0063] (1) The raw materials used in this embodiment include Ti 3 AlC 2 Powder and Mg alloy block of model AZ91D;

[0064] (2) After adding Ti 3 AlC 2 Powder prepared into Ti 3 AlC 2 For the green body: pressurize to 8MPa and release the pressure;

[0065] (3) For Ti 3 AlC 2 When the green body is sintered, the temperature is raised to 1200°C for heat preservation;

[0066] (4) The mass of Mg alloy block required for high-temperature infiltration is 25g; and during high-temperature infiltration, the temperature is lowered to 900°C, and the holding time is 30min.

[0067] Other steps and parameters are the same.

[0068] This embodiment prepares Ti 3 AlC 2 -The program control temperature-time curve of AZ91D composite material is as follows Figure 4 As show...

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Abstract

The invention relates to an MAX-phase ceramic-magnesium or magnesium alloy composite material and a preparation method thereof. According to the main technical scheme, the preparation method of the MAX-phase ceramic-magnesium or magnesium alloy composite material comprises the following steps that putting MAX-phase ceramic powder or an MAX-phase ceramic green body prepared from the MAX-phase ceramic powder in a heating area in a heating furnace, and putting a magnesium block or a magnesium alloy block in a feeder of the heating furnace; heating the MAX-phase ceramic powder or the MAX-phase ceramic green body placed in the heating area to a sintering temperature under a protective atmosphere or a vacuum condition, and keeping the temperature for a first set time to obtain a sintered block; and adjusting the temperature of the sintered block to the infiltration temperature, controlling the feeder to turn over, feeding the magnesium block or the magnesium alloy block to the sintered block, carrying out heat preservation for second set time so that high-temperature infiltration can be conducted, and obtaining the MAX-phase ceramic-magnesium or magnesium alloy composite material after cooling. The method is mainly used for preparing the light, high-strength and wear-resistant MAX-phase ceramic-magnesium or magnesium alloy composite material through a simple process.

Description

technical field [0001] The invention relates to the technical field of lightweight high-strength structural materials, in particular to a MAX phase ceramic-magnesium or magnesium alloy composite material and a preparation method thereof. Background technique [0002] Due to its light weight and superior mechanical properties, lightweight high-strength structural materials are of great significance to engineering applications such as aerospace and automotive industries, and have the advantages of load reduction, weight reduction, energy saving and emission reduction. [0003] As a lightweight metal structure material, magnesium alloy has high specific strength and specific stiffness, excellent casting performance and machining performance, and has broad application prospects. However, the low elastic modulus, limited high-temperature strength, poor wear resistance and corrosion resistance of magnesium alloys greatly limit its industrial application. The method of composite s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622C04B38/00C22C1/10C22C23/00C22C29/06C22C32/00C04B41/88
CPCC04B35/5618C04B35/622C04B38/0054C22C1/1015C22C29/067C22C23/00C22C32/0052C04B41/88C04B41/009C04B41/51C04B2235/96C04B2235/77C22C1/1021C04B38/0074C04B38/0067C04B41/4523
Inventor 刘增乾谷瑞成刘艳艳张哲峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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