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Preparation method of rare earth oxide silicon-based ceramic core

A rare earth oxide, ceramic core technology, applied in the field of ceramic core manufacturing, can solve the problems of low strength, poor compressive performance, etc., and achieve the effect of improving electrical conductivity, high temperature resistance, and high plasticity

Inactive Publication Date: 2019-08-30
安徽齐鑫新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the defects of poor compressive performance and low strength of the ceramic core in the prior art, and provide a preparation method of a rare earth oxide silicon-based ceramic core, which has ultra-high temperature resistance and high-strength compressive resistance performance

Method used

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preparation example Construction

[0031] A method for preparing a rare earth oxide silicon-based ceramic core. The chemical composition percentage of the silicon-based ceramic core material is: 8%-10% ceramic fiber, 3%-5% ethyl silicate hydrolyzate, 8%-10% zirconium British powder, 40% ~ 60% silicon nitride, 10% ~ 20% boron oxide, 1% ~ 2% aluminum oxide, 1% ~ 2% lanthanum oxide and 10% ~ 12% plasticizer, this material is composed of The rare earth element lanthanum oxide in the silicon-based ceramic core improves the conductivity and high temperature resistance of the ceramic core, and the zircon powder makes the surface smooth to further enhance the high temperature resistance. A small amount of alumina forms an aluminum oxide film on the surface of the ceramic core to improve the performance of the ceramic core. Excellent strength and oxidation resistance, the viscosity of the ethyl silicate hydrolyzate improves the overall strength of the ceramic core, while its fire resistance makes the ceramic core fire re...

Embodiment 1

[0046] A preparation method of a rare earth oxide silicon-based ceramic core in this embodiment, the chemical composition percentage of the aluminum-based ceramic core material is: 10% ceramic fiber, 5% ethyl silicate hydrolyzate, 10% zircon powder, 40% Silicon nitride, 20% boron oxide, 1% aluminum oxide, 2% lanthanum oxide and 12% plasticizer.

[0047] It is measured that the decomposition temperature of the ceramic core obtained after the preparation of the above-mentioned ratio of materials is greater than or equal to 2000°C, and the compressive strength is 1315Mpa.

Embodiment 2

[0049] A preparation method of a rare earth oxide silicon-based ceramic core in this embodiment, the chemical composition percentage of the aluminum-based ceramic core material is: 8% ceramic fiber, 4% ethyl silicate hydrolyzate, 10% zircon powder, 45% Silicon nitride, 15% boron oxide, 1% magnesium oxide, 1% lanthanum oxide and 10% plasticizer.

[0050] It is measured that the decomposition temperature of the ceramic core obtained after being prepared by using the materials in the above ratio is greater than or equal to 2108° C., and the compressive strength is 1390 MPa.

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Abstract

The invention relates to a preparation method of a rare earth oxide silicon-based ceramic core, and belongs to the technical field of ceramic manufacturing. The silicon-based ceramic core material comprises the following chemical components in percentage by weight: 8-10% of ceramic fibers, 3-5% of an ethyl silicate hydrolysate, 8-10% of zircon powder, 40-60% of silicon nitride, 10-20% of boron oxide, 1-2% of aluminum oxide, 1-2% of lanthanum oxide and 10-12% of a plasticizer. The silicon-based ceramic core disclosed by the invention has superhigh temperature resistance and high strength.

Description

technical field [0001] The invention belongs to the field of ceramic core manufacturing, and more specifically relates to a preparation method of a rare earth oxide silicon-based ceramic core. Background technique [0002] There are many kinds of oxide ceramics, which are widely used. They can be used as structural materials, functional materials and advanced refractory materials in many fields such as electronics, information, laser, infrared, computer, aerospace, atomic energy, chemical industry and metallurgy. [0003] At present, alumina and silica-based ceramic cores, which have been widely studied, are difficult to apply to the field of titanium alloy precision casting because the core materials do not have good chemical reaction inertness to molten titanium alloys and the core removal process is complicated. It has good reaction inertness at high temperature, so adding a small amount of rare earth oxides in the ceramic core can improve the high temperature creep resis...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/80
CPCC04B35/806C04B35/584C04B2235/3217C04B2235/3227C04B2235/3409C04B2235/3427C04B2235/483C04B2235/5216C04B2235/96
Inventor 高博王伟周衡潘教庆
Owner 安徽齐鑫新材料科技有限公司