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Multi-scale reinforced low/negative thermal expansion magnesium-based composite material and preparation method thereof

A negative thermal expansion, composite material technology, applied in the field of multi-scale reinforced low/negative thermal expansion magnesium matrix composites and their preparation, can solve the problems of huge difference in thermal expansion coefficient, interlayer cracking, etc., so as to reduce the difference in thermal expansion coefficient and avoid easy Aging, the effect of overcoming adverse effects

Active Publication Date: 2019-01-01
山东大华新材料集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method successfully prepared a low thermal expansion magnesium-based composite material, but this laminated composite material is a single-scale reinforced composite material, and there is an alloy layer between the fiber layers, and layers will appear between the two due to the huge difference in thermal expansion coefficient. Between cracks

Method used

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  • Multi-scale reinforced low/negative thermal expansion magnesium-based composite material and preparation method thereof
  • Multi-scale reinforced low/negative thermal expansion magnesium-based composite material and preparation method thereof

Examples

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preparation example Construction

[0044] Wherein, the preparation method of the reinforcement comprises the following steps:

[0045] 1) laying a single layer of fiber without weft or fiber fabric to make a continuous fiber layer;

[0046] 2) uniformly distribute quantitative negative expansion particles on the surface and inside of the single-layer fiber non-weft cloth or fiber fabric;

[0047] 3) Prepare the single-layer fiber non-woven fabric or fiber fabric with negative expansion particles prepared in step 2) into the required laminate preform according to the required layering method, and perform Z-direction puncture reinforcement with punctured fiber bundles ;

[0048] 4) Put the prepared laminated prefabricated body into distilled water and ultrasonically treat it so that the negative expansion particles are more evenly distributed between the layers of the fiber fabric and between the fiber bundles. .

Embodiment 1

[0050] In this example, the base metal is AZ91D magnesium alloy, the solidus is 470°C, and the liquidus is 595°C; the continuous fiber layer is T700 carbon fiber non-weft cloth, and the layering method is unidirectional layering; the negative expansion particles are zirconium tungstate.

[0051] Prepare multi-scale reinforcements by laminating one layer of non-weft cloth and one layer of zirconium tungstate to ensure the same orientation of the fibers of the non-weft cloth. ; The thickness of the zirconium tungstate layer is 0.5 mm, and the distance between the punctured fibers in the Z direction is 20 times the diameter of the fiber bundle. Under the protection of Ar gas, melt AZ91D to 610°C and keep it warm for 45 minutes; put the reinforcement into the impregnation mold, and preheat the reinforcement base impregnation mold to 595°C under the protection of Ar gas, and keep it warm for 45 minutes; The alloy is injected into the extrusion die, and a press is used to apply an i...

Embodiment 2

[0054] In this example, the base metal is AZ91D magnesium alloy, the solidus is 470°C, and the liquidus is 595°C; the continuous fiber layer is T700 carbon fiber non-weft cloth, and the layering method is orthogonal layering; the negative expansion particles are zirconium tungstate.

[0055] The multi-scale reinforcement is prepared by laminating one layer of 0° no weft cloth, one layer of zirconium tungstate and one layer of 90° no weft cloth. The number of laminations of no weft cloth is 7 layers, and the thickness of each layer is one layer of no weft cloth. Cloth thickness: The thickness of the zirconium tungstate layer is 0.5mm, and the distance between the punctured fibers in the Z direction is 20 times the diameter of the fiber bundle. Under the protection of Ar gas, melt AZ91D to 620°C and keep it warm for 45 minutes; put the reinforcement into the impregnation mold, and preheat the reinforcement base impregnation mold to 595°C under the protection of Ar gas, and keep i...

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Abstract

The invention discloses a multi-scale reinforced low / negative thermal expansion magnesium-based composite material and a preparation method thereof. The composite material comprises a base material and a reinforcement body, wherein the base material is prepared from magnesium alloy; the reinforcement body has a multi-scale 2.5D laminated structure, and comprises continuous fiber layers, negative expansion particle layers and Z-direction puncture reinforced fibers, wherein the continuous fiber layers and the negative expansion particle layers are alternately distributed; the upper surface layerand lower surface layer of the reinforcement body are the continuous fiber layers, and negative expansion particles are evenly distributed between the continuous fiber layers and bundles; Z-directionpuncture fiber bundles puncture and reinforce the continuous fiber layers and the negative expansion particle layers along the Z direction. The composite material effectively overcome the adverse effects, caused by'thermal expansion and contraction', on the traditional structural materials in a service process.

Description

technical field [0001] The invention relates to the field of composite material preparation, in particular to a multi-scale reinforced low / negative thermal expansion magnesium-based composite material and a preparation method thereof. Background technique [0002] Most of the traditional structural materials are materials with a positive thermal expansion coefficient. When the temperature changes, the geometric size changes, and the phenomenon of "thermal expansion and contraction" occurs. The phenomenon of destroying the original precision of the structure due to thermal deformation is widely present in the engineering field. , causing immeasurable losses. Composite materials are multi-phase materials composed of two or more different materials. The different performance characteristics of different materials can be used to carry out certain material ratio and microstructure design, so as to achieve low / negative thermal expansion at the same time. The advantages of light w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C49/04C22C47/06C22C47/12C22C101/00
CPCC22C47/06C22C47/12C22C49/04
Inventor 鞠录岩马玉钦梁军浩张建兵
Owner 山东大华新材料集团有限公司
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