Lesson_3 Plastics and ceramics (5)

Lesson_3 Plastics and ceramics (5) - Glossary 493 V Many...

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V Many silicates and other ceramics form glasses rather easily, since the kinetics of crystallization are sluggish. Glasses can be formed in the form of sheets using float- glass or fibers and other shapes. Silicate glasses are used in a significant number of applications that include window glass, windshields, fiber optics, and fiberglass. V Glass-ceramics are formed using controlled crystallization of inorganic glasses. These materials are used widely for kitchenware and many other applications. V Ceramics, in the form of fibers, thin films, coatings, and single crystals, have many di¤erent applications. GLOSSARY Apparent porosity The percentage of a ceramic body that is composed of interconnected porosity. Bulk density The mass of a ceramic body per unit volume, including closed and interconnected porosity. Cementation Bonding ceramic raw materials into a useful product, using binders that form a glass or gel without firing at high temperatures. Ceramic An inorganic material with high melting temperature. Usually hard and brittle. Ceramic bond Bonding ceramic materials by permitting a glassy product to form at high firing temperatures. Cermet A ceramic-metal composite (e.g., WC-Co) providing a good combination of hardness with other properties such as toughness. Cold isostatic pressing (CIP) A powder-shaping technique in which hydrostatic pressure is applied during compaction. This is used for achieving a higher green ceramic density or compac- tion of more complex shapes. Devitrification The crystallization of glass. Enamel A ceramic coating on metal. Firing Heating a ceramic body at a high temperature to cause a ceramic bond to form. Flux Additions to ceramic raw materials that reduce the melting temperature. Glass An amorphous material derived by cooling of a melt. Glass-ceramics Polycrystalline ceramics formed initially in the glassy state and later crystallized during heat treatment to achieve improved strength and toughness. Glass formers Oxides with a high bond strength that easily produce a glass during processing.
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  • Spring '14
  • Colombo
  • Physics, Ceramics, Material Science, Plastics, Manufacturing, Metals, Glass, Ceramic materials, sintering, Ceramic engineering

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