Preparation method of high-strength Si3N4/SiC composite ceramics

A composite ceramic, high-strength technology, applied in the field of SiC composite ceramic preparation, can solve the problems of reducing the surface accuracy of materials, easy oxidation and corrosion of materials, etc., and achieve the effect of improving surface corrosion resistance

Inactive Publication Date: 2013-01-30
NANJING DADI REFRIGERATION FOOD
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Problems solved by technology

At present, in the sintering preparation process, it is usually screened to add suitable sintering aids to improve the various properties of the material, such as alumina, which can improve the Vickers hardness of the material, but it is easy to accumulate on the surface of the material, making the material easy to be oxidized and corroded, reducing the The surface accuracy of its material

Method used

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Embodiment Construction

[0008] The present invention will be further described below.

[0009] A high-strength Si 3 N 4 The preparation method of / SiC composite ceramics is mainly based on SiC powder, adding 14% Si powder and 2.5% Al 2 o 3 , 0.68% Fe 2 o 3 , 2.6% of Y 2 o 3 and 0.8% CeO 2 , then wet the roll in the ball mill for 5 hours, dry to obtain 800-mesh powder, and then after granulation and dry pressing, nitriding and sintering at 1580°C to obtain Si 3 N 4 / SiC composite ceramics.

[0010] The composite ceramic prepared by the above method has been tested: its Vickers hardness can reach 2.185GPa; the thermal bending strength at 150°C can reach 420MPa, and the fracture toughness can reach 12MPa m 1 / 2 . Through scanning electron microscopy and XRD testing, the surface of the material is less enriched in aluminum, which can reduce the impact on the surface appearance of the metal aluminum due to oxidation and corrosion.

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Abstract

The invention discloses a preparation method of high-strength Si3N4/SiC composite ceramics; and the preparation method comprises the following steps of: (a) using SiC powder as a main material; adding 10-15 % of Si powder, 2.2-2.7 % of Al2O3, 0.6-0.8 % of Fe2O3, 2.5-3.0 % of Y2O3 and 0.5-1.2 % of CeO2 to the main material; (b) wetly rolling a mixed powder obtained in the step (a) in a ball mill for 4-6 h; drying and granulating the mixed powder; and dryly pressing the mixed powder for molding; and (c) nitriding and sintering the mixed powder at 1500-1600 DEG C so as to obtain the Si3N4/SiC composite ceramics. The Vickers hardness of the composite ceramic material prepared by the method disclosed by the invention can reach 2.185 GPa, the heat bending strength of the composite ceramic material can reach 420 MPa, and the breaking tenacity of the composite ceramic material reaches 12 MPa*m1/2; and the corrosion resistance of the surface of the composite ceramic material is enhanced.

Description

[0001] technical field [0002] The invention belongs to the field of inorganic functional materials, in particular to the preparation of SiC composite ceramics. Background technique [0003] Si 3 N 4 Composite ceramic materials combined with SiC have high temperature resistance strength, fracture toughness and oxidation resistance, and are widely used in electronics, construction and metallurgy industries. At present, in the sintering preparation process, it is usually screened to add suitable sintering aids to improve various properties of the material, such as alumina, which can improve the Vickers hardness of the material, but it is easy to be enriched on the surface of the material, making the material easy to be oxidized and corroded, reducing the Its material surface accuracy. Contents of the invention [0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a high-strength Si 3 N 4 / SiC composite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622
Inventor 陈大弟
Owner NANJING DADI REFRIGERATION FOOD
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