Silicon-nitrogen-oxygen ceramic transmitted wave material and method for producing the same

Abstract

The invention relates to silicon nitrogen oxygen ceramic wave penetrating material and belongs to the special type and functional ceramics technical field. The invention comprises the components in weight proportion that: 90 to 95 percent of silicon nitride, 5 to 10 percent of yttria, and 70 to 80 percent of adscititious quartz. The product is produced by compounding, moulding and burning, wherein, the mixed powder is shaped by firstly producing the granule of the mixed power lot by utilizing the adhesives and then being pressed, the granularity is controlled between 60 and 90 micron; the material product is shaped by adopting the cold isostatic compaction with the pressure being 100 to 160 MPa, and is sintered without pressure under the nitrogen ambience with the sintering temperature being 1700 to 1750 DEG C and the high temperature heat preserving time being 60 to 90 minutes. The material product not only has good dynamical and thermal property, high intensity, low conducting and small heat swelling, but also has excellent dielectric capacity; the dielectric constant Epsilon is less than 3.5 and the electric medium wastage is less than 2.3 multiple 10E-3, so that the invention can satisfy the applying requirements of the high penetrating rate of 8 mm wave band. The invention has scientific and reasonable preparing method, simple and easy operation and easy implementation.

Description

technical field [0001] The invention relates to a silicon oxynitride ceramic wave-transmitting material and a preparation method thereof, belonging to the technical field of special and functional ceramics. Background technique [0002] Millimeter wave guidance has quasi-all-weather characteristics and good low-altitude, ultra-low-altitude overlooking tracking and the ability to deal with stealth targets. However, due to the short wavelength of millimeter waves (8mm), the required high-performance millimeter-wave materials must have high electromagnetic wave penetration capabilities, and at the same time require light weight and high strength. Its thermal, electrical, structural strength and rigidity are very demanding, the wall thickness tolerance is small, and the processing accuracy of the cover body is high, which increases the difficulty of material research, production and product molding. Traditional ceramic materials cannot meet the above comprehensive requirements,...

AI Technical Summary

Problems solved by technology

Its comprehensive properties such as heat, electricity, structural strength and rigidity are very demanding, the wall thickness tolerance is small, and the processing accuracy of the cover body is high, so it increases the difficulty of material research, production and product molding

Traditional ceramic materials cannot meet the above comprehensive requirements. Therefore, it has been a difficult problem for domestic and foreign scholars to overcome the wave-transparent composite ceramic materials that can be applied to the 8 mm wave band.

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