Ceramic/metal composite of gradient double-continuous structure and preparation method and application of ceramic/metal composite

A technology of metal composite materials and metal materials, which is applied in the field of ceramic/metal composite materials and its preparation, can solve the problems of restricting the high hardness of ceramic materials, reducing the load-bearing capacity and impact resistance, and achieve high load-bearing capacity and impact resistance. even force effect

Active Publication Date: 2017-09-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional gradient ceramic-metal composite material generally adopts the metal phase dispersed in the end rich in ceramic phase, and the ceramic phase is dispersed in the end rich in metal phase. The schematic diagram of its microstructure is as follows: figure 1 As shown in , when the traditional gradient ceramic metal composite is subjected to dynamic load, the stress wave is transmitted mainly through the interface between the ceramic phase and the metal phase, and stress concentration will occur at the interface between the two phases, which reduces its bearing capacity and resistance. Therefore, it restricts the full play of the advantages of high hardness, high compressive strength and metal phase high toughness and high tensile strength of ceramic materials.

Method used

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  • Ceramic/metal composite of gradient double-continuous structure and preparation method and application of ceramic/metal composite
  • Ceramic/metal composite of gradient double-continuous structure and preparation method and application of ceramic/metal composite
  • Ceramic/metal composite of gradient double-continuous structure and preparation method and application of ceramic/metal composite

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A ceramic / metal composite material with a gradient bicontinuous structure, which is composed of a porous ceramic material with a continuous gradient of porosity and a metal material filled in the pores of the porous ceramic material, wherein the ceramic material is Al 2 o 3 , SiC, Si 3 N 4 , B 4 C or TiB 2 Any one of them; the metal material is a fusible metal, which is any one of aluminum alloy, magnesium alloy or iron alloy.

[0034] The schematic diagram of the microstructure of the ceramic / metal composite material with gradient bicontinuous structure is as follows figure 2 As shown, the ceramic phase and the metal phase form a bicontinuous structure. In this structure, due to the continuous distribution of the metal phase, when the force is applied, the composite material is evenly stressed through the transmission of the metal phase, and no stress concentration occurs. The ceramic phase and the metal phase respectively provide high elastic stiffness and failu...

Embodiment 2

[0037] Prepare the ceramic / metal composite material with gradient bicontinuous structure described in Example 1, comprising the following steps: the ceramic material used is B 4 C, the metal material used is aluminum alloy, which is prepared by squeeze casting method, which specifically includes the following steps:

[0038] S1: The porous B with a continuous gradient of porosity 4 C ceramic material is used as a preform, and the preform is put into an infiltration mold and preheated to 400°C;

[0039] S2: Heat and melt the aluminum alloy at 800°C, pour the obtained aluminum alloy melt into the impregnation mold, pressurize immediately, the pressure is 80MPa, and infiltrate the aluminum alloy melt from top to bottom Into the prefabricated body; keep the pressure for 20 minutes to ensure that the aluminum alloy melt is completely solidified under this pressure, and then withdraw from the mold. got a B 4 Composite materials with C / Al alloy gradient bicontinuous structure, whi...

Embodiment 3

[0043] The preparation of the ceramic / metal composite material with a gradient bicontinuous structure described in Example 1 comprises the following steps: the ceramic material used is SiC, the metal material used is aluminum alloy, and is prepared by a pressureless infiltration method, specifically including the following steps :

[0044] The porous SiC ceramic material with a continuous gradient of porosity is used as a preform, the preform is placed on the aluminum alloy, and then the whole is placed in a vacuum environment for heating, and the vacuum degree is lower than 10 -2 Pa, the heating rate is 2°C / min; when the temperature rises above the melting point of the aluminum alloy, N 2 Or Ar protective atmosphere, after holding for 0.1-10h, cooling to room temperature and demoulding, a composite material with gradient bicontinuous structure of SiC / Al alloy is obtained, which has a gradient change from high content of ceramic phase to high content of metal phase, such as ...

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Abstract

The invention provides a ceramic / metal composite of a gradient double-continuous structure. The ceramic / metal composite is formed by compounding a porous ceramic material with the porosity continuous gradient and a metal material arranged in holes of the porous ceramic material in a filling manner. Any one of Al2O3, SiC, Si3N4, B4C and TiB2 is used as the ceramic material. Any one of an aluminum alloy, a magnesium alloy and an iron alloy is used as the metal material. The ceramic / metal composite has the beneficial effects that in the ceramic / metal composite of the gradient double-continuous structure, ceramic phases and metal phases form the double-continuous structure; and in the structure, due to the continuous distribution of the metal phases, when stressed, the composite is evenly stressed due to the transmission function of the metal phases, no stress concentration is generated, and the composite has the higher bearing capacity and the impact resistance.

Description

technical field [0001] The invention relates to a ceramic / metal composite material with a gradient bicontinuous structure, in particular to a ceramic / metal composite material with a gradient bicontinuous structure, and a preparation method and application thereof. Background technique [0002] The highly technologically developed war environment has put forward higher strategic and tactical mobility requirements for weapons and equipment, so the armor system must strictly control its own quality, and the homogeneous metal-based armor material is difficult to meet the lightweight requirements due to its high density. Ceramic materials have outstanding characteristics such as high hardness, high strength, high elastic modulus, low density, wear resistance and corrosion resistance, and show good protection performance against high-speed armor-piercing projectiles and jets, and their protection coefficient is much higher than that of standard homogeneous armor steel. . However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C04B35/58C04B35/584C04B38/00C04B35/565C04B35/563C04B35/10
CPCC22C1/1036C04B35/10C04B35/563C04B35/565C04B35/58071C04B35/584C04B38/0045C22C1/1021C22C1/1073
Inventor 刘强叶枫高烨华鑫源张海礁张标
Owner HARBIN INST OF TECH
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