Corundum-silicon carbide crystal whisker composite ceramic material taking natural minerals as raw materials and preparation method thereof

A technology of silicon carbide whiskers and natural minerals, applied in the field of ceramic materials, can solve the problems of low product yield, high raw material cost, and high product cost, and achieve the effects of high mechanical strength, reduced product cost, and improved yield

Active Publication Date: 2018-07-13
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of material system generally has problems such as high raw material cost, uneven mixing, and uneven performance; even though some studies have adopted the method of in-situ synthesis of whiskers to introduce silicon carbide, the aluminum and silicon sources are still selected as industrial-grade raw materials , not only the product cost is high, but also it is not easy to form, and the product yield is low

Method used

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  • Corundum-silicon carbide crystal whisker composite ceramic material taking natural minerals as raw materials and preparation method thereof

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Effect test

Embodiment 1

[0022] 1. In this embodiment, a corundum-silicon carbide whisker composite ceramic material utilizing natural minerals as raw materials includes a base material and a binder. The base material is composed of kaolin (250 mesh) 65wt%, metal aluminum powder (180 mesh) 35wt%, the binding agent is a PVA solution with a concentration of 5wt%, and its consumption is 8wt% of the base material.

[0023] 2. In this embodiment, a corundum-silicon carbide whisker composite ceramic material using natural minerals as raw materials is as follows:

[0024] After mixing the above-mentioned base materials, add a binder and mix them evenly; after stirring and trapping the materials, select an appropriate pressure according to the size of the product for compression molding, and dry at a temperature of 110°C to obtain a green body (moisture content in the kiln <0.5%); then Embedding graphite powder and firing at 1450°C for 2 hours, the corundum-silicon carbide whisker composite ceramic material w...

Embodiment 2

[0026] 1. In this embodiment, a corundum-silicon carbide whisker composite ceramic material utilizing natural minerals as raw materials, including a base material and a binder, the base material is composed of kaolin (250 mesh) 40wt%, bauxite (180 mesh) 40wt%, metal aluminum powder (325 mesh) 20wt%, binding agent is the PVA solution of concentration 5wt%, and its consumption is 6wt% of base material.

[0027] 2. In this embodiment, a corundum-silicon carbide composite ceramic material using natural minerals as raw materials is as follows:

[0028] After mixing the above-mentioned base materials, add a binder and mix them evenly; after stirring and trapping the materials, select an appropriate pressure according to the size of the product for compression molding, and dry at a temperature of 110°C to obtain a green body (moisture content in the kiln <0.5%); then Buried carbon powder, fired at 1500°C for 2 hours, and the corundum-silicon carbide whisker composite ceramic material...

Embodiment 3

[0030] 1. In this embodiment, a corundum-silicon carbide whisker composite ceramic material utilizing natural minerals as raw materials includes a base material and a binder. The base material is composed of kaolin (250 mesh) 30wt%, andalusite (180 mesh) 40wt% %, metal aluminum powder (325 order) 30wt%, binding agent is the PVA solution of concentration 5wt%, and its consumption is 8wt% of base material.

[0031] 2. In this embodiment, a corundum-silicon carbide whisker composite ceramic material using natural minerals as raw materials is as follows:

[0032] After mixing the above-mentioned base materials, add a binder and mix them evenly; after stirring and trapping the materials, select an appropriate pressure according to the size of the product for compression molding, and dry at a temperature of 110°C to obtain a green body (moisture content in the kiln <0.5%); then Embedding graphite powder and firing at 1550°C for 2 hours, the corundum-silicon carbide whisker composite...

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Abstract

The invention discloses a corundum-silicon carbide crystal whisker composite ceramic material taking natural minerals as raw materials. The corundum-silicon carbide crystal whisker composite ceramic material is prepared from a basic material and a binding agent, wherein the basic material is prepared from the following components: 65 to 90 weight percent of aluminum silicate minerals and 10 to 35weight percent of metal aluminum powder and the dosage of the binding agent is 6 to 12 weight percent of the basic material. Furthermore, the invention discloses a preparation method of the corundum-silicon carbide crystal whisker composite ceramic material taking the natural minerals as the raw materials. A mixture of the natural minerals and the metal aluminum powder is used as a raw material system and corundum and silicon carbide crystal whiskers are introduced through an in-situ synthesis manner, so that the problem in the prior art that industrial powder and aggregate are not easy to mixuniformly is effectively solved and the performance of the corundum-silicon carbide composite ceramic material is improved to the greatest extent. The corundum-silicon carbide crystal whisker composite ceramic material disclosed by the invention has the advantages of easiness for obtaining the raw materials, simple technology, low firing temprature and high rate of finished products; the corundum-silicon carbide crystal whisker composite ceramic material has important meanings of improving the quality of the corundum-silicon carbide composite ceramic material and saving the product cost, andis good for progression and development of popularization and application and an industry technology.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a corundum-silicon carbide whisker composite ceramic material and a preparation method thereof. Background technique [0002] As a high-purity, fine-grained material, corundum ceramics have been widely used for a long time because of their advantages such as high refractoriness, high hardness, high strength and chemical inertness. However, due to the low fracture energy of corundum ceramics, it cannot withstand the thermal stress caused by rapid cooling and rapid heating, so it is easy to cause fracture, which restricts its application in some high-temperature structural fields. Silicon carbide has the advantages of high thermal conductivity, high strength and high thermal shock resistance, which can make up for the shortage of corundum materials. Therefore, silicon carbide combined with corundum materials is a composite ceramic material that combines the advantages of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/81C04B35/10C04B35/634
CPCC04B35/10C04B35/63416C04B35/803C04B2235/3463C04B2235/349C04B2235/402C04B2235/425C04B2235/524C04B2235/96C04B2235/9607
Inventor 徐笑阳劳新斌李亚格
Owner JINGDEZHEN CERAMIC INSTITUTE
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