Method for preparing silicon carbide particle-reinforced silicon nitride composite ceramic parts

A technology of silicon nitride complex phase and silicon carbide particles, which is applied in the field of composite ceramic parts preparation, can solve the problems of complex shape, uneven structure of composite ceramic parts, difficult processing, etc., and achieves the effect of uniform product structure and high dimensional accuracy.

Inactive Publication Date: 2010-12-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a method for preparing SiCp / Si 3 N 4 Composite Parts Approach, Solving SiCp / Si 3 N 4 In the production process of composite ceramic parts, there are problems such as uneven structure, difficult processing, and high cost, and SiCp / Si with complex shape and high dimensional accuracy has been realized. 3 N 4 Low Cost Fabrication of Composite Ceramic Parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: SiCp / Si containing 5wt% SiC and 58vol% loading 3 N 4 Composite Parts

[0015] The mass fraction of each component of the raw material is 5% SiC+85% Si 3 N 4 +4.3%Al 2 o 3 +5.7%Y 2 o 3 , the binder is a multi-polymer paraffin-based binder, the weight fraction of each component is 65% PW+25% HDPE+10% SA, and the powder loading is 58vol%.

[0016] High-purity silicon nitride micropowder with a particle size of 0.58 μm, silicon carbide powder with a particle size of 0.09 μm, and sintering aids were mixed in proportion, and ball milled in a corundum ball mill jar for 16 hours with absolute ethanol as a solvent. Then the ball-milled ceramic powder and binder are prepared according to the ceramic powder volume fraction of 58%, and are mixed evenly at 140° C. on an SK2160 type open plastic mill. Then use the PSJ32 single-screw extruder to extrude and granulate. On the CJ80E injection molding machine, the injection pressure is 100MPa, the injection temperature...

Embodiment 2

[0017] Example 2: SiCp / Si containing 10wt% SiC and 50vol% loading 3 N 4 Composite Parts

[0018] The mass fraction of each component of the raw material is 10% SiC+80% Si 3 N 4 +4.3%Al 2 o 3 +5.7%Y 2 o 3 , The binder is a multi-polymer paraffin-based binder, the weight fraction of each component is 63% PW+27% HDPE+10% SA, and the powder loading is 50vol%.

[0019] Mix high-purity silicon nitride micropowder with a particle size of 0.8 μm, silicon carbide powder with a particle size of 0.09 μm, and sintering aids in proportion, and use absolute ethanol as a solvent to ball mill in a corundum ball mill for 16 hours. Then the ball-milled ceramic powder and binder are prepared according to the volume fraction of the ceramic powder at 58%, mixed evenly on the SK2160 open plastic mill at 140 ° C, and then extruded and granulated with a PSJ32 single-screw extruder. On the CJ80E injection molding machine, the injection pressure is 100MPa, the injection temperature is 180°C, th...

Embodiment 3

[0020] Example 3: SiCp / Si with 20wt% SiC and 58% loading 3 N 4 Composite Parts

[0021] The mass fraction of each component of the raw material is 5% SiC+85% Si 3 N 4 +4.3% Al 2 o 3 +5.7%Y 2 o 3 , the binder is a multi-polymer paraffin-based binder, the weight percentage of each component is PW:HDPE:SA=65:25:10, and the powder loading is 58vol%.

[0022]Mix silicon nitride micropowder with a particle size of 0.58 μm and high-purity α-phase>93%, silicon carbide powder with a particle size of 0.09 μm, and sintering aids in proportion, and use absolute ethanol as a solvent to ball mill in a corundum ball mill for 16 hours. Then the ball-milled ceramic powder and binder are prepared according to the volume fraction of the ceramic powder at 58%, mixed evenly on the SK2160 open plastic mill at 140 ° C, and then extruded and granulated with a PSJ32 single-screw extruder. On the CJ80E injection molding machine, the injection pressure is 100MPa, the injection temperature is 170...

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Abstract

The invention discloses a method for preparing silicon carbide particle-reinforced silicon nitride composite ceramic parts, and belongs to the technical field of ceramic part preparation. The method comprises the following steps of: mixing SiC powder, Si3N4 powder, a sintering acid and a paraffin base multicomponent binder into a uniform feed; and performing solvent-thermal debinding and presintering at the temperature of between 1,150 and 1,200 DEG C on a preformed blank obtained by injection molding of the feed, and sintering in a vacuum carbon tube furnace at the temperature of between 1,800 and 1,900 DEG C and at the normal pressure in the Ar atmosphere to prepare SiCp/Si3N4 composite ceramic parts. The method for preparing the silicon carbide particle-reinforced silicon nitride composite ceramic parts has the advantages of direct preparation of SiCp/Si3N4 composite ceramic products with complicated geometry, uniform texture, high dimensional accuracy and no need of subsequent processing, achievement of integrated molding of the SiCp/Si3N4 materials and the parts, and establishment of low-cost preparation technology for the SiCp/Si3N4 composite ceramic parts with complicated shapes and high dimensional accuracy.

Description

technical field [0001] The invention belongs to the technical field of preparation of composite ceramic parts, and in particular provides a method for preparing silicon carbide particle-reinforced silicon nitride (SiCp / Si 3 N 4 ) method of multiphase ceramic parts to realize the preparation of low-cost, high-performance ceramic matrix composite parts. Background technique [0002] SiCp / Si 3 N 4 The material has the heat resistance, thermal shock resistance, wear resistance and corrosion resistance required as a high-temperature structural material, and is lighter than metal. It is of great significance to meet the needs of nuclear energy, petrochemical, aerospace, national defense and other fields. The ceramic material itself is inherently brittle and high hardness. Although the traditional powder metallurgy molding method is simple in process, the formed blank formed by molding often has uneven density, and the shape complexity of the parts is also limited to a certain e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/583C04B35/622
Inventor 何新波田常娟梅敏曲选辉
Owner UNIV OF SCI & TECH BEIJING
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