The inorganic fibrous heat insulating and sound absorbing material refers to a natural or artificial type of fibrous material which is based on inorganic minerals. The oldest natural inorganic fiber material used by humans is asbestos. Due to the growing scarcity of quality resources and the fact that asbestos is harmful to human health, traditional asbestos and asbestos products have gradually faded out of the construction market. Inorganic fibrous adiabatic and sound absorbing materials mainly refer to artificial inorganic fibrous materials such as rock wool, mineral wool, glass wool and aluminum silicate cotton.
These materials have the same fibrous morphology and structure in appearance, and have low density, good thermal insulation effect, no burning, corrosion resistance, strong chemical stability, good sound absorption performance, no toxicity, no pollution, anti-mite, and low cost. And so on, it can be widely used as building insulation, sound absorption, sound insulation and insulation, heat insulation, cold insulation and sound absorption materials for industrial pipes, furnaces and various thermal equipment. At present, Sanmao products (rock wool, mineral wool, glass wool) have been widely used as building insulation and sound absorbing materials at home and abroad. Aluminum silicate fiber, due to its high temperature resistance, stable physical and chemical properties, low thermal conductivity, small heat capacity and good thermal stability, is a new type of lightweight and efficient thermal insulation material recognized at home and abroad. It is mainly used for high temperature insulation of industrial furnaces. And used as a filtering and sound absorbing material.
Silicon nitride ceramic is an inorganic material ceramic that does not shrink when sintered. Silicon nitride is very strong, especially hot pressed silicon nitride, which is one of the hardest substances in the world. It has high strength, low density and high temperature resistance.
Si3N4 ceramic is a covalent bond compound. The basic structural unit is a [SiN4] tetrahedron. The silicon atom is located at the center of the tetrahedron. There are four nitrogen atoms around it, which are located at the four vertices of the tetrahedron, and then every three A tetrahedron shares the form of an atom, forming a continuous and robust network structure in three dimensions.
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