• V W Impex

Ceramic Bearings, Very High Temperature

V W Impex offers very high temperature Silicon Carbide (SiC) Ceramic Bearings that can withstand temperatures up to 1200°C. Silicon carbide is composed of tetrahedra of carbon and silicon atoms with strong bonds in the crystal lattice. This produces a very hard and strong material. Silicon carbide is not attacked by any acids or alkalis or molten salts up to 800°C. In air, SiC forms a protective silicon oxide coating at 1200°C and is able to be used up to 1600°C. The high thermal conductivity coupled with low thermal expansion and high strength gives this material exceptional thermal shock resistant qualities. Silicon carbide ceramics with little or no grain boundary impurities maintain their strength to very high temperatures, approaching 1600°C with no strength loss. Chemical purity, resistance to chemical attack at temperature, and strength retention at high temperatures has made this material very popular as wafer tray supports and paddles in semiconductor furnaces. The electrical conduction of the material has lead to its use in resistance heating elements for electric furnaces, and as a key component in thermistors (temperature variable resistors) and in varistors (voltage variable resistors).

V W Impex is an established name in the field of bearings as an importer, exporter and supplier of eccentric bearings, precision bearings, linear motion guides and rails, ceramic bearings, plastic bearings, and above all Nilos rings. Backed by an experience in this field of over two decades, the company imports directly from manufacturers in Germany, England and USA, a range of hard-to-find bearings not available in the Indian market.