Study On The Characteristic And Structure Of The Alumina-silicate Fiber Paper

Along with the rapid development of aeronautic and astronautic industries of high technology, the performance of heat insulation materials need higher requirement. The performance of heat resisting and heat insulating directly influence the exertion of the properties of advanced flight vehicles. Alumina-Silicate fiber possesses the better heat insulation capability at high temperature,so it is extensively used as excellent high temperature insulators for aerospace industry in a number of grades and forms; however the performance of heat resisting and heat insulating need to be improved in order to meet the heat insulation need of the new equipment. The purpose of the research is to develop the heat-insulating composites with low conductivity based of alumina-silicate fiber to meet the particular need of the equipment.We have prepared highly effective thermal insulations made of the alumina-silicate fiber using vacuum filtering molding web technique, Alumina-silicate fiber is used as a matrix; PVA,CMC,SBR,PAC are used as additives for heat insulation. In the experiment, we had found the techniques parameters which affect the change of thermal-conductivity. The shapes of heat-insulating composites based of the Alumina-Silicate fiber have been investigated by means of scanning electron microscope (SEM),the heat insulation mechanism of the heat-insulating composites is discussed .Results we get as following:1. The heat-insulating composites with low thermal-conductivity based of the Alumina-Silicate fiber can be prepared using vacuum filtering molding web technique by adding the bend,In which,Alumina-Silicate fiber is used as fibrous materials.2. Based on the traditional papermaking technical, the mill can be appropriate to improve the beating alumina-silicate fibers for papermaking fibers.3. Taking the advantage of different characteristics of silicate fibers and residue-density, we use the settlement method to clean the fiber.4. Through the choice of different adhesive and modified, paper strength can be improved .the best dosage is 4% of Na2HPO4 and 2% of the Na2B4O45. We modified water glass and discussed by X-ray diffraction and infrared spectral analysis. And I found water glass and not modified to form a new compound or chemical bonds, but just form a composite network. It improved the character of the paper making. Through this paper, the character of the aluminum silicate fiber paper was influenced by the dosage of the adhesive. The adhesive improve the heat insulation and the strength of the paper.