Dimensional stability, refractories

CAS 1327-36-2 EINECS/ELINCS 215-475-1 Uses Filler, extender in paints/coatings (extends TiOj, exc. scrubbability and sheen control, hydrophilic, easily dispersed), ceramics (improves fired props., inc. dimensional stability in wh. ware, elec, porcelain, refractories), wire and cable compds. 

Reheat Test. The prescribed heat treatment of a fired refractory to determine its dimensional stability when reheated to a second temperature higher than the temperature to which it was first... 

Oxides with layered stmcture or those whose structures contain large tunnels or cavities may display abnormal ion movement or serve as templates for heterogeneous catalysis (see Ionic Conductors Intercalation Chemistry Oxide Catalysts in Solid-state Chemistry andZeolites). Many oxides are stabilized by the formation of structures that are highly defective nature and have similar properties to those listed above (see Defects in Solids). The strong bonds, which result in three-dimensional cross-linked structures, give rise to inert, refractory materials that have a variety of uses (see Section 5.3.6 and Ceramics). 

Cederqvist studied 17 different tool materials to friction stir weld 50 mm thick copper (Ref 33), and the first material evaluations were for use as the tool pin. Tungsten carbide-cobalt pins provided the initial welding parameter development, but tool life issues (due to large spindle eccentricities) made this tool material impractical for production. Likewise, eccentricity issues caused PCBN, alumino-silicate, and yttria-stabilized zirconium oxide pins to fail within the plunge or dwell sequence of the friction stir welds. A majority of e pins manufactured from refractory metals (four molybdenum-base and three tungsten-base) did not have dimensional... 

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