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High mechanical strength foamed ceramic material and preparation method thereof

A foamed ceramic and mechanical strength technology, applied in the field of foamed ceramic materials, can solve problems such as material fracture or fragmentation, and achieve the effects of improving mechanical strength, prolonging service life, and eliminating stress concentration.

Active Publication Date: 2015-03-11
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

[0004] The purpose of the present invention is to provide a foamed ceramic material with high mechanical strength and its preparation method, which solves the problem that the triangular central hole of the existing foamed ceramic material is easy to form a high stress concentration point at the top corner under the condition of internal stress or external force. , resulting in problems such as fracture or shattering of the material under relatively small pressure

Method used

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  • High mechanical strength foamed ceramic material and preparation method thereof
  • High mechanical strength foamed ceramic material and preparation method thereof
  • High mechanical strength foamed ceramic material and preparation method thereof

Examples

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preparation example Construction

[0028] Such as figure 1 , image 3 As shown, the preparation method of the high mechanical strength ceramic foam material of the present invention prepares an additional coating on the surface of the polymer foam plastic, and modifies the triangular ribs of the polymer foam plastic into a circle or a nearly circular shape. The polymer foam is used as the precursor, and the ceramic foam material is obtained by the replication method. The central hole is circular or nearly circular. Compared with the ceramic foam material with a triangular central hole, the mechanical strength of the material is significantly improved. Specifically Including the following steps:

[0029] (1) dissolving the soluble polymer resin in distilled water or an organic solvent to form a resin solution with a concentration of 10-100 g / L;

[0030] (2) Fully immerse the polymer foam in the above solution to ensure that the resin solution and all areas of the polymer foam are fully infiltrated. If necessar...

Embodiment 1

[0037] The preparation process of the present embodiment to prepare high mechanical strength foamed silicon carbide is as follows:

[0038] 1. Dissolve water-soluble polycarbonate in distilled water to obtain a resin solution with a concentration of 5 g / L;

[0039] 2. Fully soak the polyurethane foam in the above solution, and squeeze the foam repeatedly to ensure that the resin solution is in full contact with all parts of the polyurethane foam. After soaking for 2 minutes, take out the polyurethane foam, and blow off the excess liquid with compressed air;

[0040] 3. Dry the soaked polyurethane foam at 80°C, so that the resin is cured on the surface of the polyurethane foam to obtain a coating, and the triangular ribs of the polyurethane foam are initially rounded;

[0041] 4. Weigh and record data;

[0042] 5. Repeat steps 2 to 4 above until the weight gain of the polyurethane foam reaches twice the weight of the original polyurethane foam;

[0043]6. Using the polyureth...

Embodiment 2

[0047] The difference from Example 1 is that the resin concentration is 10 g / L, and other conditions are the same.

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Abstract

The invention relates to the field of foamed ceramic materials, in particular to a high mechanical strength foamed ceramic material provided with a circular centre hole or a suborbicular centre hole and a preparation method of the high mechanical strength foamed ceramic material. The preparation method adopts a soluble high-molecular polymer cladding method to make a cross section shape of a rib body of the high-molecular foamed plastic transformed from a triangle to a circle; the circular high-molecular foamed plastic is taken as a precursor, and the foamed ceramic material obtained finally is provided with the circular centre hole or the suborbicular centre hole. The preparation method comprises the following steps: preparing an additional coating on the surface of the high-molecular foamed plastic; modifying the triangular rib of the high-molecular foamed plastic to be circular or suborbicular; utilizing the circular high-molecular foamed plastic as the precursor; adopting a cloning method to obtain the foamed ceramic material of which the centre hole is circular or suborbicular. Compared with the mechanical strength of the same material with a triangular centre hole, the mechanical strength of the foamed silicon carbide ceramic is obviously improved. Therefore, the service life of the material can be effectively prolonged.

Description

Technical field: [0001] The invention relates to the field of foamed ceramic materials, in particular to a high-mechanical-strength foamed ceramic material with a circular or nearly circular central hole and a preparation method thereof. Background technique: [0002] Foamed silicon carbide ceramic materials not only have excellent material properties such as corrosion resistance, high temperature oxidation resistance, high thermal conductivity, low expansion, and chemical inertness, but also have structural characteristics such as three-dimensional connectivity and good heat and mass transfer performance, so they are ideal structural carrier material. [0003] Among the current foamed silicon carbide production technologies, the most cost-effective and the most promising technology for large-scale industrial production is the replica molding method. The main technical feature of this method is to use the polymer foam material as the precursor, uniformly wrap a layer of slu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/565C04B35/14C04B35/185C04B35/195C04B35/622
Inventor 张劲松杨振明田冲曹小明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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