Fiber reinforced ceramic-based composite material antenna cover for wave band W and preparation method thereof

[0033] This embodiment provides a method for preparing a W-band fiber-reinforced ceramic matrix composite composite radome, the steps of which are:

[0034] (1) Quartz fiber prefabricated body with 2.5D weaving structure is adopted, the quartz fiber yarn is 190Tex, and the number of warp and weft strands is 1-2 strands; and 50 twists are added during the weaving process;

[0035] (2) Use nitric acid soaking to remove the sundries introduced during the weaving process, and then use a combination of boiling and heat treatment to remove the surface sizing of the quartz fiber preform, and the heat treatment temperature is 500-550°C;

[0036] (3) Use high-purity silica sol to perform liquid-phase impregnation molding on the preformed quartz fiber preform in step (2). The first round of impregnation uses high-purity silica sol with a solid content of 50-55% for cyclic impregnation. The impregnation process uses Vacuum, vibration and high pressure are combined, and after the impregnatio

[0047] This embodiment provides a method for preparing a W-band fiber-reinforced ceramic matrix composite composite radome, the steps of which are:

[0048](1) Use 2.5D woven structure quartz fiber prefabricated body, the quartz fiber yarn is 190Tex or 195Tex, and the number of warp and weft strands is 1-2 strands; and 60 twists are added during the weaving process;

[0049] (2) Use nitric acid soaking to remove the sundries introduced during the weaving process, and then use a combination of boiling and heat treatment to remove the surface sizing of the quartz fiber preform, and the heat treatment temperature is 600°C;

[0050] (3) Using high-purity silica sol to carry out liquid-phase impregnation molding to the preformed quartz fiber prefabricated body in step (2), the first round of impregnation adopts high-purity silica sol with a solid content of 55% for cyclic impregnation, and the impregnation process adopts vacuum, Vibration and high pressure are combined, and after the

[0061] This embodiment provides a method for preparing a W-band fiber-reinforced ceramic matrix composite composite radome, the steps of which are:

[0062] (1) A 2.5D braided quartz fiber preform is adopted, the quartz fiber yarn is 190Tex, and the number of warp and weft strands is 1-2 strands; and 70 twists are added during the weaving process;

[0063] (2) Use nitric acid soaking to remove the sundries introduced during the weaving process, and then use a combination of boiling and heat treatment to remove the surface sizing of the quartz fiber preform, and the heat treatment temperature is 800°C;

[0064] (3) Using high-purity silica sol to carry out liquid-phase impregnation molding to the preformed quartz fiber preform in step (2), the first round of impregnation adopts high-purity silica sol with a solid content of 60% for cyclic impregnation, and the impregnation process adopts vacuum, Vibration and high pressure are combined, and after the impregnation is completed, the