Alumina ceramic fibers can be found on almost every commercial aircraft in the world. The reason: The ceramic textiles withstand extremely high temperatures and are extremely durable. At the same time, they’re flexible and light, and meet high fire protection requirements in aircraft. They’re also used as structural reinforcement in modern metal, polymer, and oxide ceramic (CMC) composites for structural applications.
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Products made from these ceramic fibers have long been used in spacecraft as heat shields and for impact protection - in applications ranging from door seals, gaskets and gap fillers to tiles for the space shuttle. For example, blankets sewn from Nextel fabrics protect the Delta II rocket engine from the exhaust plume of the solid boosters, and Whipple shields made from Nextel fabrics protect the International Space Station and satellites from impacts from micrometeorites and space debris.
In addition, these ceramic fibers are also used in a variety of high temperature sealing and heat protection applications, such as door seals, rotary kiln gaskets and furnace linings. They meet the most stringent thermal, mechanical, and electrical performance requirements, exceeding the limits of traditional high-temperature textiles such as aramid, carbon, quartz, and glass. They’re also oxidation resistant, chemically inert, lightweight, flexible, flame retardant, and electrically insulating at high temperatures.
Ceramic fibers prevent erosion of ceramic fiber modules. This helps reduce dust that can contaminate products and be a problem for nearby operators and personnel. Reducing erosion of insulation structures can also help reduce maintenance costs and time.
Ceramic fibers make a significant contribution to the development and series production of innovative Ceramic Matrix Composites (CMC) with outstanding properties. They have the highest breaking strength even under high thermal and mechanical loads and are therefore clearly superior to monolithic ceramics. CMC can also be used to implement demanding special applications up to and including ceramic sheet.
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The aluminum oxide ceramic fibers have very good strength and flexibility even under the highest temperature stresses.
The high electrical resistance of ceramic fibers at high temperatures makes them an excellent choice for high temperature electrical insulation applications.
The ceramic fibers have very low shrinkage and thus offer excellent dimensional stability.
Due to their special surface structure, the ceramic fibers are not hygroscopic: if they are exposed to 100% humidity for two hours, they only increase by 0.08% of their original weight.
There are also several other positive properties that make this material perfect for many high-tech applications. Other outstanding properties of ceramic fibers include their fire resistance, their chemical resistance and their resistance to abrasion and impact.
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