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High-volume-fraction ceramic-metal layered composite material and preparation method thereof

A metal composite material and a composite material technology, which are applied in the field of high-volume ceramic-metal layered composite materials and their preparation, can solve the problems of disorder, structure containing residual pores, and high metal phase content, so as to improve performance, eliminate The effect of porosity defect, good toughening effect

Active Publication Date: 2017-11-07
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The key problem to be solved by the present invention is that the layers of the ceramic-metal layered composite material produced by traditional freeze casting are only in an orderly arrangement on a one-dimensional scale, but in other directions they are in a disordered and disordered structure. The content of the metal phase in the medium is too high (more than 50vol.%) and the structure contains defects such as residual holes

Method used

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  • High-volume-fraction ceramic-metal layered composite material and preparation method thereof
  • High-volume-fraction ceramic-metal layered composite material and preparation method thereof
  • High-volume-fraction ceramic-metal layered composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Will Al 2 o 3 Ceramic powder (D 50 =5μm, 99.9%) and deionized water are mixed at a volume ratio of 1:2.3, and a dispersant (polyammonium methacrylate, accounting for 1wt.% of the mass of the ceramic slurry) and a binder (polyvinyl alcohol, accounting for the ceramic slurry mass) are added 1wt.% of the slurry mass), then ball milled (speed 150 rev / min, ball milled for 8 hours) and defoamed for 20min to prepare an Al with an initial ceramic content of 30vol.%. 2 o 3 Ceramic slurry 200ml. Install the polytetrafluoroethylene mold on the wedge-shaped frozen copper plate, the plate length is 100mm, and the inclination angle is 5°. The mold is placed at a distance of 10mm from the thick end of the wedge-shaped frozen plate, and then the ceramic slurry is injected into the polytetrafluoroethylene mold. The thick end of the tube was cooled at a constant rate of 1°C / min from room temperature. After the frozen ceramic green body is removed from the mold, it is quickly put int...

Embodiment 2

[0032] Will Al 2 o 3 Ceramic powder (D 50 =2μm, 99.9%) and deionized water are mixed at a volume ratio of 1:4, and a dispersant (ammonium polymethacrylate, accounting for 1wt.% of the mass of the ceramic slurry) and a binder (polyvinyl alcohol, accounting for the ceramic slurry mass) are added 1wt.% of the slurry mass), then ball milled (speed 150 rev / min, ball milled for 8 hours) and defoamed for 20min to prepare an Al with an initial ceramic content of 20vol.%. 2 o 3 Ceramic slurry 200ml. Install the polytetrafluoroethylene mold on the wedge-shaped frozen copper plate, the plate length is 60mm, and the inclination angle is 10°. The mold is placed at a distance of 5mm from the thick end of the wedge-shaped frozen plate, and then the ceramic slurry is injected into the polytetrafluoroethylene mold. The thick end of the tube was cooled at a constant rate of 5°C / min from room temperature. After the frozen ceramic body is removed from the mold, it is quickly put into a freez...

Embodiment 3

[0036] Will Al 2 o 3 Ceramic powder (D 50 =500nm, 99.9%) and deionized water are mixed at a volume ratio of 1:4, and a dispersant (polyammonium methacrylate, accounting for 1wt.% of the mass of ceramic slurry) and a binder (polyvinyl alcohol, accounting for ceramic slurry mass) are added 1wt.% of the slurry mass), then ball milled (speed 150 rev / min, ball milled for 8 hours) and defoamed for 20min to prepare an Al with an initial ceramic content of 20vol.%. 2 o 3 Ceramic slurry 200ml. Install the polytetrafluoroethylene mold on the wedge-shaped frozen aluminum plate, the plate length is 80mm, and the inclination angle is 7.5°. The mold is placed 20mm away from the thick end of the wedge-shaped frozen plate, and then the ceramic slurry is injected into the polytetrafluoroethylene mold. The thick end is cooled at a constant rate of 1°C / min from room temperature. After the frozen ceramic green body is removed from the mold, it is quickly put into a -50°C freeze dryer for fre...

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Abstract

The invention relates to a high-volume-fraction ceramic-metal layered composite material. The volume fraction of ceramics reaches 70-90 vol.%, and the ceramics are of high directional layered parallel structures; ceramic layers are connected through a metal ligament bridge; the thickness of the ceramic layer is 20-80 [mu]m, and the thickness of the metal ligament bridge is 5-10 [mu]m. According to the high-volume-fraction ceramic-metal layered composite material and a preparation method thereof, a layered porous ceramic skeleton is made by the double-temperature gradient freezing casting process, the whole (three-dimensional) layered structures are regular and are arranged in parallel; excess metal phase in the layered composite material is pressed out by utilizing the hot pressing process, so that the layered ceramic-metal composite material with the ceramic volume fraction being up to 70-90 vol.% is successfully prepared and is closer to the composition ratio of a shell pearl layer; the ceramic layers which are stem grafting are broken into separated layer pieces by utilizing the hot pressing process, the excess metal phase is squeezed into the gap between these separated ceramic layers, a brick-mud structure which is very similar to the shell pearl layer is formed, and the strengthening and toughening effect is better.

Description

technical field [0001] The invention relates to a high-volume ceramic-metal layered composite material and a preparation method thereof, belonging to the technical field of composite materials. Background technique [0002] Natural biomaterials are usually composed of simple raw material components such as minerals and organic matter in nature, but their complex multi-scale hierarchical assembly structure endows them with excellent mechanical properties and the best adaptability to the living environment. A typical example of this is seashells. Pearl oyster is composed of about 95vol.% brittle aragonite (mainly composed of CaCO 3 ) and about 5vol.% of organic matter, but its fracture toughness is more than 3000 times that of natural aragonite, which is mainly due to the multi-scale and multi-level "brick-mud" layered structure formed by the alternate layering of aragonite and organic matter . The toughness mechanism of pearl oyster provides inspiration for overcoming the ...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C29/00
CPCC22C1/10C22C29/00
Inventor 沈翔天沈平胡志杰刘玉华
Owner JILIN UNIV
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