Self-growth silicon nitride whisker enhanced radar antenna window/radome and preparation method thereof
A radar antenna, self-growth technology, applied in the direction of the radiation unit cover, etc., can solve problems such as poor high temperature mechanical properties, achieve good thermal shock resistance, improve strength and high temperature resistance, and inhibit devitrification.
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[0019] The invention provides a self-grown Si 3 N 4 The preparation method of the whisker-enhanced radar antenna window / radome, the specific steps are as follows.
[0020] S1: SiO 2f Put the preform into the muffle furnace, raise the temperature to 250-300°C in the air environment for 1 hour, then keep it warm for 2-4 hours, cool down to room temperature with the furnace, and take it out.
[0021] S2: Incorporate nano-Si 3 N 4 Powder and Nano Y 2 o 3 Mix evenly, pour into the PVA aqueous solution, stir evenly at 95-100°C for 2-4 hours, add water continuously during the process to keep the total mass of the powder in 1L PVA aqueous solution at 15-30g, and obtain a mixed solution; among them, nano-Si 3 N 4 Powder and Nano Y 2 o 3 The mass ratio of is 100:(1-2).
[0022] S3: SiO after S1 treatment 2f The preform is placed in the mixed solution, pressurized to 1-2MPa and maintained for 0.5-1 hour; then taken out, and dried in a muffle furnace at 80-90°C for 6-12 hours. ...
Embodiment 1
[0029] This embodiment provides a self-grown Si 3 N 4 The preparation method of the whisker-enhanced radar antenna window / radome, the specific steps are as follows.
[0030] S1: SiO 2f Put the preform into the muffle furnace, raise the temperature to 250°C in the air environment for 1 hour, then keep the temperature for 2 hours, cool to room temperature with the furnace, and take it out.
[0031] S2: 1000g nano-Si 3 N 4 Powder with 10g Nano Y 2 o 3 Mix evenly, pour into 5L PVA aqueous solution, stir evenly at 95°C for 4 hours, add water continuously during the process to keep the concentration basically constant, and obtain a mixed solution.
[0032] S3: SiO after S1 treatment 2fThe preform was placed in the mixed solution, pressurized to 2MPa and kept under pressure for 1 hour; then it was taken out and dried in a muffle furnace at 90°C for 12 hours.
[0033] S4: SiO after S3 treatment 2f The preform was placed in silica sol with a concentration of 30%, pressurized t...
Embodiment 2
[0039] This embodiment provides a self-grown Si 3 N 4 The preparation method of the whisker-enhanced radar antenna window / radome, the specific steps are as follows.
[0040] S1: SiO 2f Put the preform into the muffle furnace, raise the temperature to 300°C in the air environment for 1 hour, then keep the temperature for 2 hours, cool to room temperature with the furnace, and take it out.
[0041] S2: Add 500g nano-Si 3 N 4 powder with 10g Nano Y 2 o 3 Mix evenly, pour into 3.5 LPVA aqueous solution, stir evenly at 100°C for 4 hours, add water continuously during the process to keep the concentration basically constant, and obtain a mixed solution.
[0042] S3: SiO after S1 treatment 2f The preform is placed in the mixed solution, pressurized to 1 MPa and maintained for 0.5 hours; then taken out and dried in a muffle furnace at 85°C for 10 hours.
[0043] S4: SiO after S3 treatment 2f The preform was placed in silica sol with a concentration of 30%, pressurized to 2MPa...
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Abstract
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