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