silica refractory
41Cristobalite — spheres formed via devitrification (loss of silica) from the obsidian matrix (California, USA) 5.9×3.8×3.8 cm. General Category Silicate mineral …
42silicon — /sil i keuhn, kon /, n. Chem. a nonmetallic element, having amorphous and crystalline forms, occurring in a combined state in minerals and rocks and constituting more than one fourth of the earth s crust: used in steelmaking, alloys, etc. Symbol …
43metallurgy — metallurgic, metallurgical, adj. metallurgically, adv. metallurgist /met l err jist/ or, esp. Brit., /meuh tal euhr jist/, n. /met l err jee/ or, esp. Brit., /meuh tal euhr jee/, n. 1. the technique or science of working or heating metals so as… …
44Brick — For other uses, see Brick (disambiguation). An old brick wall in English bond laid with alternating courses of headers and stretchers …
45Concrete — This article is about the construction material. For other uses, see Concrete (disambiguation). Outer view of the Roman Pantheon, still the largest unreinforced solid concrete dome.[1] …
46Slag — is the by product of smelting ore to purify metals. They can be considered to be a mixture of metal oxides; however, they can contain metal sulfides (see also matte) and metal atoms in the elemental form. While slags are generally used as a waste …
47Freeze casting — Freeze casting, or freeze gelation is a form of sol gel processing of ceramics that enables a ceramic object to be fabricated in complex shapes, without the need for high temperature sintering.The process is simple, but the science is, as of 2005 …
48Oughtibridge — Coordinates: 53°26′10″N 1°32′20″W / 53.436°N 1.539°W / 53.436; 1.539 …
49Cement — In the most general sense of the word, a cement is a binder, a substance which sets and hardens independently, and can bind other materials together. The name cement goes back to the Romans who used the term opus caementicium to describe masonry… …
50aluminum processing — Introduction preparation of the ore for use in various products. Aluminum, or aluminium (Al), is a silvery white metal with a melting point of 660° C (1,220° F) and a density of 2.7 grams per cubic centimetre. The most abundant… …
