A silicon nitride-based composite material antenna window and its preparation method
A composite material and silicon nitride-based technology, which is applied in manufacturing tools, additive processing, ceramic molding machines, etc., can solve problems such as large interface stress, large difference in thermophysical properties, and difficulty in preparing silicon nitride-based antenna windows. Achieve the effect of eliminating interface stress and simple process
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[0039] The invention provides a method for preparing a silicon nitride-based composite material antenna window, comprising the following steps:
[0040] Step S1: According to the change law of the dielectric constant of the antenna window of the silicon nitride-based composite material with the thickness, the change law of the porosity with the thickness is determined, and then the solid phase content of the ceramic slurry for preparing the silicon nitride-based composite material is determined. The law of change.
[0041] The different broadband wave-transmission requirements of the antenna window can be realized through the design of the gradient change form of the dielectric constant of the wave-transmissive material. The intrinsic dielectric constant of the silicon nitride-based composite material is a certain value, and the dielectric constant of air is approximately 1. The introduction of pores in silicon nitride based composites will reduce the dielectric constant of si...
Embodiment 1
[0091] This embodiment provides a method for preparing a silicon nitride-based composite material antenna window, which includes the following steps in sequence:
[0092] Step S1: The dielectric constant and thickness of the silicon nitride-based composite antenna window are designed as follows: the dielectric constant decreases linearly from 5.8 to 1.8 in the thickness direction, and the change size in the thickness direction is 9.75mm, and then the dielectric constant is from 1.8 to 1.8. 4.8 Linear increase, the thickness direction change size is 6.25mm. The corresponding relationship between dielectric constant, porosity and solid phase content is determined through experiments, and factors such as sintering shrinkage rate and machining allowance are considered to determine the change law of solid phase content in ceramic slurry with thickness, specifically as follows figure 2shown. The solid phase content decreases linearly from 60vol% to 10vol% in the thickness directio...
Embodiment 2
[0102] This embodiment provides a method for preparing a silicon nitride-based composite material antenna window, which includes the following steps in sequence:
[0103] Step S1: The dielectric constant and thickness of the silicon nitride-based composite material antenna window are designed as follows: in the thickness direction, the dielectric constant decreases from 5.8 to 1.8 according to the parabolic equation, and the thickness direction changes to 9.75mm, and then the dielectric constant is determined by From 1.8 to 3.2, the parabola equation increases incrementally, and the change size in the thickness direction is 6.25mm. The corresponding relationship between the dielectric constant, porosity and solid phase content was determined through experiments, and the factors such as sintering shrinkage and machining allowance were comprehensively considered to determine the variation law of the solid phase content in the ceramic slurry with the thickness, as follows: Figur...
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