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Ceramic sheets and boards are stock shapes available as solid plates, slabs, and substrates. The board or plate may consist of a ceramic fiberboard product, a dense sintered ceramic plate, or a precast cement bonded slab. Dimensional specifications for ceramic sheets and boards are given as length, width, and thickness or wall thickness. Units of measure include inches (in) and fractions of inches, and millimeters (mm) and centimeters (cm). In terms of features, some products are coated, hollow, or modified. Others are porous to provide insulation, or made of single-crystal materials that exhibit desirable piezoelectric, optical or magnetic properties. Sintered ceramic sheets and boards are also available. Often, hot isostatic pressing (HIP) is used to densify these materials.
Types of Ceramic Materials
Ceramic sheets and boards are made of many different types of ceramic materials. Choices include alumina and alumina oxide, alumina-zirconia, aluminum-nitride, and aluminum silicate; boron carbide and boron nitride; calcium aluminate, carbon, ceria, and cordierite; forsterite and graphite; and hafnia and hafnium oxide. Ceramic sheets and boards may also be made of kaolin or clay-based. Materials may also include magnesia or magnesite, metal boride, mullite, rare earth oxides (REO), porcelain, and sapphire. Silica, fused silica, silicon carbide, silicon nitride, SiAION, and silicide ceramic sheets and boards are available, too. SiAION is an alloy of silicon nitride and aluminum oxide that provides a superior refractory material. Ceramic sheets and boards are also available in steatite, titania, yttria, tungsten carbide, zircon, zirconia, and zirconium phosphate.
Ceramic Sheet Applications
There are many different applications for ceramic sheets and boards. For example, bioceramics are specially formulated or designed to have suitable biocompatibility for biotechnology and medical applications. Optical-grade materials are used in the fabrication or processing of optical components such as lenses, windows, or prisms. Some ceramic sheets and boards are used in chemical and material processing, dielectric and electrical insulating, or foundry and metal processing applications. Others are used to fabricate electrical parts for high voltage (HV) or power applications. Ceramic boards that are designed for electronics, radio frequency (RF), microwave, structural, or wear parts applications are also available from many different suppliers