Light high-strength SiC porous material and preparation method thereof
A porous material and high-strength technology, applied in the field of lightweight and high-strength SiC porous materials and their preparation, can solve the problems of limited strength contribution of porous ceramics, and achieve the effect of high strength and low density
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Embodiment 1
[0030] SiC nanowires (length-to-diameter ratio 50-100, diameter-100nm) were put into deionized water in batches, and a 10vol% SiC nanowire slurry was prepared by ultrasonic dispersion, and then the nanowire mass fraction was 10% Al 2 o 3 / Y 2 o 3(Molar ratio 3:2) The sintering aid is added to the dispersed SiC nanowire slurry, and further ultrasonically dispersed. The obtained slurry is sieved through a 60-mesh sieve to filter out large-sized agglomerates that are difficult to disperse. Add polyethylene glycol with a water quality of 10 wt% to the filtered slurry, stir it at high speed mechanically for 6 hours, then add a 1-octanol defoamer with a water content of 1%, and continue stirring for 1 hour to obtain a final paste suitable for printing. The obtained slurry is transferred to the barrel of the 3D printing device based on the slurry extrusion method. Under program control, at room temperature, the paste in the barrel is extruded through a needle with a diameter of 4...
Embodiment 2
[0032] What is mainly prepared in this example is a porous silicon carbide ceramic composed of grid-like oriented SiC nanowires with visible macroscopic pores. The preparation method of the material is the same as in Example 1. The printing parameters were adjusted so that the printing pitch was 500 μm. After sintering, the porosity of the material is 68.2%, and the compressive strength is 38MPa.
Embodiment 3
[0034] This example mainly introduces a porous silicon carbide ceramic composed of oriented SiC whiskers (with an aspect ratio of 10-50 and a diameter of about 1 μm). The specific preparation method is the same as that of Example 1. The porosity of the material is 53.9%, and the compressive strength is 123MPa.
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