Silicon nitride - boron nitride- silicon dioxide ceramic wave-transparent material and preparation process thereof

Abstract

The invention relates to a ceramic wave-transmitting material and preparing method thereof, wherein the material is prepared from sub-micron high purity silicon nitride, boron nitride, zirconium dioxide and nano silica flour through batching, homogeneously mixing by means of supersonic wave and chemical dispersion method, forming through cold isostatic compaction method, and high-sintering in nitrogen atmosphere.

Description

technical field [0001] The invention relates to a ceramic wave-transparent material and a preparation method thereof, and belongs to the technical field of special and functional ceramic materials. Background technique [0002] The performance of the radome depends on the selected material. In the guidance system, the transmission efficiency and aiming error of the radome are very sensitive to the dielectric properties of the material and their relationship with temperature, frequency, etc., and the material is required to have a low dielectric constant ( ε<10) and dielectric loss, and the dielectric properties do not change significantly with temperature and frequency (such as temperature rise of 100°C, ε change<1%). The high Mach number of the missile makes the instantaneous heating rate of the radome as high as 120°C / S or more. Therefore, when the temperature is raised, the molecular structure of the material is required to be stable, and the material properties (su...

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Problems solved by technology

[0006] High-performance ceramic wave-transparent materials are one of the key directions of material research at home and abroad. In the past, the research focused on quartz ceramics. Due to the low mechanical and temperature resistance and poor ablation performance of quartz ceramics, its application has been greatly affected. limits

In recent years, research on silicon nitride ceramics and boron nitride ceramic materials has been mainly carried out internationally. Since silicon nitride ceramic materials were mainly used as structural ceramics in the past, their mechanics, temperature resistance and ablation resistance are in the material Medium is the best, but its dielectric constant is large, which affects its wave-transmitting performance; boron nitride ceramics have a low dielectric constant, and their stability is very good, but the mechanical properties of boron nitride ceramics are poor, And easy to deliquescence in the air

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