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
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[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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