Whisker composite ceramics for metal extrusion or the like
AssigneeCorning Glass Works
InventorsKishor P. Gadkaree, K. Pattabhirami Reddy
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Abstract
A composite ceramic extrusion die consisting of a silicon carbide wisker-reinforced cordierite ceramic wherein the predominant matrix phase is cordierite or, preferably, barium-stuffed cordierite having a crystal compositon xBaO.4MgO.(4+x)Al.sub.2 O.sub.3.(10-2x)SiO.sub.2 wherein x ranges from zero up to about 0.5, such extrusion die exhibiting excellent durability under the conditions of non-ferrous metal alloy extrusion at temperatures of 700.degree.-900.degree. C., is described.
Claims4
In a metal extrusion die for the extrusion of ferrous and non-ferrous alloys comprising a ceramic body incorporating an extrusion orifice therethrough for the extrusion of said alloys, the improvement wherein the die consists of a whisker-reinforced crystalline body consisting essentially of about 5-35 weight percent of SiC whiskers and 65-95 weight percent of a crystalline matrix, the predominant crystal phase in the crystalline matrix consisting of a crystal selected from the group consisting of cordierite and barium-stuffed cordierite.
Dependencies are inferred from the claim text.