Stratified aluminum boron carbide compound material and preparation method thereof

A composite material, boron carbide technology, applied in the field of layered composite materials, can solve problems such as easy fracture or even broken, user loss, and affecting material application

Inactive Publication Date: 2017-12-22
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the relative reduction in the bonding strength between layers, when encountering stress wave impact, the layers near the inside and inside are easy to break or even break, which seriously affects the application of materials and causes losses to users.

Method used

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  • Stratified aluminum boron carbide compound material and preparation method thereof
  • Stratified aluminum boron carbide compound material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step S110, selecting aluminum powder with an average particle size of 50-60 μm and boron carbide powder with an average particle size of 1-30 μm. The aluminum powder and boron carbide powder were weighed and mixed according to the following 5 groups of volume ratios to obtain 5 groups of mixed powders. Group 1: 95vol% aluminum powder and 5vol% boron carbide powder; Group 2, 90vol% aluminum powder and 10vol% boron carbide powder; Group 3, 85vol% aluminum powder and 15vol% boron carbide powder; Group 4, 80vol % aluminum powder and 20vol% boron carbide powder; Group 5, 75vol% aluminum powder and 25vol% boron carbide powder.

[0023] In step S120, the mixed powders in step S110 are respectively put into a planetary ball mill by wet mixing method, and after ball milling, put into a blast drying oven for drying, and respectively make 5 groups of aluminum boron carbide powders correspondingly. Specifically, the following steps are included:

[0024] In step S121, each group ...

Embodiment 2

[0031] Example 2 Except that the sintering conditions in the vacuum hot-press furnace are inconsistent with Example 1, other steps are consistent with Example 1, see Example 1

[0032] In the first stage of the vacuum hot pressing furnace in Example 2, the temperature rises from normal temperature to 500°C, and the heating rate is 10°C / min; Insulate at 680°C for 90 minutes. Start the pressurization program before the temperature rises to 530°C, pressurize to a sintering pressure of 30MPa, and hold the pressure for 90min.

[0033] The mechanical properties of the layered aluminum boron carbide composite material obtained in Example 2 are measured by testing: density 98.43%, bending strength 629.63±27.24MPa, toughness 12.45±2.12MPa m 1 / 2 , hardness 151.11±18.65Hv.

[0034] figure 1 The scanning electron micrograph of the layered aluminum boron carbide composite material prepared for the second embodiment can be obtained by figure 1 a It can be seen that the layered aluminum ...

Embodiment 3

[0036] Example 3 Except that the sintering conditions in the vacuum hot-press furnace are inconsistent with Example 1, other steps are consistent with Example 1, see Example 1

[0037] In the first stage of the vacuum hot pressing furnace in Example 3, the temperature was raised from normal temperature to 500°C, and the heating rate was 10°C / min; Insulate at 700°C for 120 minutes. Start the pressurization program before the temperature rises to 550°C, pressurize to a sintering pressure of 20MPa, and hold the pressure for 120min.

[0038] The mechanical properties of the layered aluminum boron carbide composite material obtained in Example 3 are measured by testing: density 99.01%, bending strength 685.12±32.18 MPa, toughness 12.87±2.23MPa m 1 / 2 , hardness 156.89±20.45Hv.

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Abstract

The invention discloses a stratified aluminum boron carbide compound material and a preparation method thereof. The stratified aluminum boron carbide compound material comprises n stratified structures distributed on one side of an axial plane and n stratified structures symmetrically distributed on the other side of the axial plane, wherein n is greater than or equal to 2; the stratified structures are prepared from aluminum powder and boron carbide powder. The content of the aluminum powder in the stratified structures in percentage by volume of the raw materials is increased layer-by-layer from inside to outside, increased from 50 vol.% to 100 vol.%; the content of the boron carbide powder is decreased layer by layer from inside to outside, decreased from 50 vol.% to 0 vol.%; and raw materials on two sides of the axial plane are consistent in change. According to the stratified aluminum boron carbide compound material disclosed by the invention, when the outer layer is destroyed, deformation also expands the propagation path of cracks to absorb more breaking energy, so that the integral strength and toughness of the material are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of layered composite materials, in particular to a layered aluminum boron carbide composite material and a preparation method thereof. Background technique [0002] Boron carbide ceramics have low density (2.5g / cm 3 ), high hardness (second only to diamond and cubic boron nitride), corrosion resistance and wear resistance. However, boron carbide is difficult to sinter and dense, and its fracture toughness is very low (MPa·m 1 / 2 ). Aluminum has the advantages of good toughness, low temperature resistance and corrosion resistance, and its density is similar to that of boron carbide (2.7g / cm 3 ), but the hardness of aluminum is low. Therefore, the aluminum boron carbide composite material combines the advantages of boron carbide and aluminum. It is a composite material with both the strength of ceramics and metal plasticity. It is used in light protection and armor bulletproof applications that require mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/02B22F3/14
CPCB22F3/14B22F7/02B22F2998/10B22F2009/043B22F2003/145
Inventor 张柳王志李庆刚史国普吴俊彦吴昊
Owner UNIV OF JINAN
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