Moisture-proof method of porous composite quartz ceramic material

Abstract

The invention discloses a moistureproof method of a porous composite quartz ceramic material. The method comprises the following steps: 1) preparing mixed liquid of an organosilicon compound and an alkane solvent; 2) roasting a porous composite quartz ceramic material; 3) soaking the roasted material in the mixed liquid prepared in the step 1) and then roasting; 4) preparing slurry with a hole sealing capacity; 5) repairing pits of the material which is roasted in the step 3) by using slurry obtained in the step 4); 6) roasting and polishing the repaired material; 7) repeating the steps 5)-6) till the surface of the material has no pits; 8) uniformly spraying mixed liquid of tetraethoxysilane, polytetrafluoroethylene resin and anhydrous ethanol on the material treated in the step 7); and 9) drying under reduced pressure. The porous composite quartz ceramic material treated by the method disclosed by the invention is good in electric performance and strong in wave permeability and has relatively good moisture resistance, appearance quality and mechanical property.

Description

technical field [0001] The invention relates to the technical field of porous composite quartz ceramic materials, in particular to a moisture-proof method for porous quartz fiber reinforced quartz ceramic materials (referred to as porous composite quartz ceramic materials). Background technique [0002] Porous composite quartz ceramic material is one of the most popular materials in recent years due to its excellent electrical insulation, electromagnetic wave permeability, thermal shock resistance, low thermal expansion coefficient, low and stable dielectric constant and dielectric loss tangent, and good strength stability at high temperature. The radome material widely used in many types of missiles at home and abroad developed in the past ten years, but this material has poor moisture resistance and water resistance due to its own porous structure and hydrophilic surface, and after the material absorbs moisture, The wave transmission performance of the radome is affected, ...

AI Technical Summary

Problems solved by technology

[0002] Porous composite quartz ceramic materials are the most popular in recent years because of their excellent electrical insulation, electromagnetic wave permeability, thermal shock resistance, low thermal expansion coefficient, low stable dielectric constant and dielectric loss tangent, and good strength stability at high temperatures. The radome material widely used in many types of missiles at home and abroad developed in the past ten years, but due to its own porous structure and hydrophilic surface, this material has poor moisture resistance and water resistance on the one hand. After the material absorbs moisture, The wave-transmitting performance of the radome is affected, and it is extremely harmful to the normal operation of the electronic components in the radome; The comprehensive mechanical properties of the material are poor, which cannot meet the requirements of severe environments such as high-speed aerodynamic heating, loading, and raindrop impact when the missile is flying at a high Mach number

[0003] At present, there is no moisture-proof method that can reduce the moisture absorption rate of porous composite quartz ceramic materials to 0.07-0.4%, and at the same time ensure its superior electrical properties (dielectric constant ≤ 2.9) and excellent appearance properties.