Ceramic fibres

Introduction

Ceramic fibers are a family of high-temperature fibers designed to be used in a variety of industrial and commercial applications. Manufactured from alumina-silica materials, fibers are chemically inert. Some of the• unique properties these fibers offer are:• High-temperature stability• Low thermal conductivity• Low heat storage• Excellent thermal shock resistance• Light weight

Basic compositions of ceramic fiber

• SiO2 50-60 % • Al2O3 30-50 % • Na2O-H2O 0.1 % • Fe2O3 0.04 % • Leachable Chlorides - 10 ppm

General properties of ceramic fiber textile products

• High temperature stability• Excellent thermal shock resistance• Good dimensional stability• Low density• Low thermal conductivity• Incombustible • Good flexibility• Good resistance to chemical• Continuous use limit 1260 °C • Melting Point 1790 °C

Manufacturing of ceramics

Manufacturing

Manufacturing

• Properties• Diameter 10-20 um• Young modulus 200 gpa• Room temparature strength 2 gpa

Applications

• Knife blades (zarconia ZnO2)• Ceramic knives will not corrode in harsh environments, are non-

magnetic, and do not conduct electricity. Because of their resistance to strong acid and caustic substances, and their ability to retain a cutting edge longer than forged metal knives, ceramic knives are a much more suitable culinary tool for slicing boneless meat, vegetables and fruit. Since they are brittle they may break if dropped on a hard surface

• A brake disc is usually made of cast iron, but may in some cases be made of composites such as reinforced carbon-carbon or ceramic matrix composite. This is connected to the wheel and/or the axel.

Vehicle brake discs

Protection

• A ballistic vest, bulletproof vest or bullet-resistant vest is an item of personal armour that helps absorb the impact from fireman-fired projectiles and shrapnel from explosions. Soft vests are made from many layers of woven or laminated fibers and can be capable of protecting the wearer from small-caliber handgun and shotgun projectiles, and small fragments from explosives such as handgrenades.

• Metal or ceramic plates can be used with a soft vest, providing additional protection from rifle rounds, and metallic components or tightly woven fiber layers can give soft armor resistance to stab and slash attacks from knives and similar close-quarter weapons. Soft vests are commonly worn by police forces, private citizens, security guards, and bodyguards, whereas hard-platereinforced vests are mainly worn by combat soldiers, police tactile units, and hostage rescue teams.

Watch making

• High-tech ceramic is used in watch making for producing watch cases. The material is valued by watchmakers for its light weight, scratch resistance, durability and smooth touch.