zircon refractory

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• refractory — refractorily, adv. refractoriness, n. /ri frak teuh ree/, adj., n., pl. refractories. adj. 1. hard or impossible to manage; stubbornly disobedient: a refractory child. 2. resisting ordinary methods of treatment. 3. difficult to fuse, reduce, or… …   Universalium

• Zircon — Not to be confused with zirconia or cubic zirconia. This article is about the mineral. For other uses, see Zircon (disambiguation). Zircon Zircon crystal from Tocantins, Brazil (2×2 cm) …   Wikipedia

• zircon — /zerr kon/, n. a common mineral, zirconium silicate, ZrSiO4, occurring in small tetragonal crystals or grains of various colors, usually opaque: used as a refractory when opaque and as a gem when transparent. [1785 95; < G Zirkon; see JARGON2] *… …   Universalium

• Refractory — A refractory is a material that retains its strength at high temperatures. ASTM C71 defines refractories as non metallic materials having those chemical and physical properties that made them applicable for structures, or as components of systems …   Wikipedia

• zircon — /ˈzɜkɒn / (say zerkon) noun a common mineral, zirconium silicate, ZrSiO4, occurring in square prismatic crystals or grains of various colours, usually opaque, used as a refractory when opaque and as a gem when transparent. {earlier cicon, variant …  

• dating — I In geology and archaeology, the process of determining an object s or event s place within a chronological scheme. Scientists may use either relative dating, in which items are sequenced on the basis of stratigraphic clues (see stratigraphy) or …   Universalium

• zirconium — zirconic /zerr kon ik/, adj. /zerr koh nee euhm/, n. Chem. a metallic element found combined in zircon, baddeleyite, etc., resembling titanium chemically: used in steel metallurgy, as a scavenger, as a refractory, and as an opacifier in vitreous… …   Universalium

• Hafnium — lutetium ← hafnium → tantalum Zr ↑ Hf ↓ Rf …   Wikipedia

• Sand casting — Sand casting, also known as sand molded casting, is a metal casting process characterized by using sand as the mold material. It is relatively cheap and sufficiently refractory even for steel foundry use. A suitable bonding agent (usually clay)… …   Wikipedia

• Zirconium — (pronEng|zɚˈkoʊniəm, IPA|/ˌzɝˈkoʊniəm/) is a chemical element with the symbol Zr and atomic number 40. It is a lustrous, gray white, strong transition metal that resembles titanium. Zirconium is used as an alloying agent due to its high… …   Wikipedia

• Cubic zirconia — A round brilliant cut cubic zirconia Cubic zirconia (or CZ) is the cubic crystalline form of zirconium dioxide (ZrO2). The synthesized material is hard, optically flawless and usually colorless, but may be made in a variety of different colors.… …   Wikipedia