owadays, because of limited resourses of energy, thermal insulation factor is becoming very important for engineers. Thus the main purpose of this work is to investigate thermal insulation property of three-dimensional knitted spacer fabrics which are improved by ceramic powders impregnated fabrics. Alternative textile structure such as three-dimensional knitted spacer fabrics have superior cyclic compression-recovery properties but are normally found in applications outside thermal insulation. However, due to the highly porous structure and the open apertures in the surfaces, three-dimensional knitted spacer fabrics usually have high air permeability and low thermal resistance. Films or some fabrics can be attached to the spacer fabric surfaces to reduce the air permeability and therefore minimize heat loss through convection. Ceramic materials are very known and useful for thermal insulation applications. Heat flux passing through a participating medium may in general be represented by several mechanisms: free and forced convection, conduction through solid fibers, conduction through air in the interfiber spaces and radiation. Thermal conduction is one mode of heat transfer in which an energy exchange takes place from the higher temperature to the lower temperature as a result of kinetic motion or direct impact of molecules.
