The research and development of heat insulation materials with low thermal-conductivity in high temperature

Abstract

The important tendency of the new style heat insulation materials is the research and development of the composites which have low thermal-conductivity in high temperature. The characteristics of the alumina-silicate fibre with K2Ti6O13 whiskers and SiO2.aerogel are discussed in this paper. Finally, several future developing directions for heat insulation matrrials with low thermal conductivity in high temperature are suggested. Introduction New heat insulation material has been widely used in aerospace, energy, chemical and metallurgical industries, An important development trend is the research and development of composite function of heat insulation materials with low thermal conductivity. The general heat insulation material has excellent heat insulating property, but the lack of high temperature strength. Therefore, refractory and heat insulation material with excellent thermal insulation properties and high temperature strength of composite function has become a new hotspot. The key technology is how to coordinate and balance the insulation properties and high temperature strength of these two mutually constrained properties in materials design and technology research[1]. In order to obtain the high strength and low thermal conductivity of composite insulation materials, The species and the composition of material need to change, Using different binder and adding amount, Study on the relationship between the material formulation, process parameters and heat insulation effects, The material’s formula is Optimized, Determine the composition structure of the new type of composite insulation materials[2]. This paper mainly discusses the characteristics of the current several heat insulation materials used, And puts forward several development directions of composite insulation materials with high temperature low thermal conduction. The characteristics of kinds of heat insulation materials Aluminum silicate fiber Aluminum silicate refractory fiber as high-temperature insulation material and refractory material has a long history. In recent years, This material is used as a heat insulation material used to prepare new thin ceramic fiber composite material thermal insulation, widely used in aerospace industry. Especially in the insulating parts with the requirement of the light quality and occupy the limited space, This material has been the most effective use , achieveing the ideal effect of thermal protection. With aluminum silicate as articles base ceramic fiber can be made into various forms of products, such as, Fiber mat, fiber board, fiber paper, fiber rope and various kinds of fabrics [3]. In the field of Aerospace, Aluminum silicate fiber insulating layer composite materials have been used as a rocket engine components,Oxygen generator insulation etc. used as the leading edge of the wing and end cap ablative protection layer in the military and commercial aircraft, fire protection layer of various instruments and equipment on the aircraft[4,8]. Compared with other insulating refractory, Aluminum silicate fiber has very small volume density, specific heat, thermal conductivity and particularly good resistance to temperature rapid change, the using temperature higher than 1200°C. If the right amount of alumina fiber is joined, the International Conference on Materials, Environmental and Biological Engineering (MEBE 2015) © 2015. The authors Published by Atlantis Press 868 use of temperature can be higher. Aluminum silicate fiber raw materials used in this experiment is the oil stained cotton provided by the Shandong Lu yang Limited company. It is the production process of ceramic in cotton,and the chemical composition and physical properties is showed in table 1 and table 2. Table 1 Chemical composition of aluminum silicate fiber Al2O3 (%) SiO2 (%) Fe2O3 (%) K2O+Na2O (%) 48.93 49.59 0.98 0.50 Table 2 Physical properties of aluminum silicate fiber fiber diameter