Process for preparing nano SiBON ceramic powder

Abstract

A nanometer SiBON ceramic powder preparation method relates to a preparation method for nano-ceramic powders, which solves the problems that the existing SiBON ceramic powder preparation is of longersynthesis cycle and complex process. The method of the invention is as follows: first, ethyl borate, ethanol and benzene are confected into mixture and are put into a three-necked bottle; second, silicon tetrachloride liquid is added to the mixture; third, magnetic stirring is maintained to charge nitrogen airflow to the three-necked bottle, and the reaction temperature is controlled through an oilbath heating means; fourth, the reaction temperature is raised; fifth, gel powders are put into a tubular furnace for heat treatment and removed after heat treatment and furnace cooling to room tempe rature; sixth, the heat-treated gel powders are put into an atmosphere sintering furnace, and then high-purity nitrogen gas is charged into the atmosphere sintering furnace, so that the SiBON nano-ceramic powder is obtained. The materials adopted by the invention is easily obtainable; the process cycle is short and is simple to be operated; the product particle size is between 20 to 50 nanometers;the product is an amorphous SiBON nano-ceramic powder provided with good dispersibility.

Description

technical field [0001] The invention relates to a preparation method of nano ceramic powder. Background technique [0002] Microwave dielectric materials refer to materials with a wavelength of 11000 mm and a frequency of 0.3 to 300 Hz. The electromagnetic wave transmittance is greater than 70%. It belongs to the category of optical, electrical, magnetic and structural functional composite materials. It is a dielectric-heat-proof-structural integration Chemical functional materials with low dielectric constant, low dielectric loss, low thermal conductivity, low thermal expansion rate, thermal shock resistance and chemical stability. Therefore, it is widely used in high-tech fields such as aerospace, electronics, and communications. SiO 2 BN and BN are two commonly used microwave dielectric materials. Their dielectric constant and dielectric loss are very small, and their thermal conductivity, thermal shock resistance and chemical stability are also excellent. However, whe...

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Problems solved by technology

However, when used alone as missile antenna window materials, both materials have the following problems: fused silica material is easy to devitrify during sintering and has poor ablation resistance; BN material is easy to oxidize and deliquescence when used in air, and During the ablation process, the surface temperature is as high as 3000°C, which leads to ionization on the surface of the material and damages its wave-transmitting performance

SiO 2 When combined with BN, it can achieve a good synergistic strengthening effect, although it can solve the problem of SiO 2 The problem of high surface temperature during sintering crystallization and BN ablation, but SiO 2 It is difficult to ensure the uniformity of BN and BN in the ball milling process, which directly affects the performance of composite materials.

Zhang Junbao of Harbin Institute of Technology and others used the sol-gel method to study the method of preparing SiBON bulk materials for the first time, which effectively solved many problems in the use of the above-mentioned wave-transparent materials, and the SiBON bulk materials obtained better mechanical properties, but this The preparation of ceramic powder by the method has a long synthesis period (10-30 days), complex preparation process (strict requirements on temperature conditions, narrow reaction temperature, not easy to control, and is not conducive to mass production), large particle size, etc. problem, therefore, restricts the application of the material