Patent ID: 6335065
Filing Date: 2002-01-01
Classification: B28B,H01L,Y10S,Y10T

Abstract:
A highly textured hollow tube prepared by the process of:providing an absorbent hollow mold rotatable about its axis, said mold comprising a porous inner surface; rotating said mold about its axis at a speed sufficient to produce a centrifugal force sufficient to force an introduced slip radially outward toward said inner surface of said mold; centrifugally casting a slip within said rotating mold, wherein said slip comprises a carrier fluid and a suspended powder, wherein substantially all of said suspended powder comprises powder particles having large dimensional aspect ratios, wherein during centrifugal casting said powder particles settle in a textured arrangement toward said mold inner surface with the long dimensions of said particles aligned substantially along an axis, wherein during centrifugal casting and after powder particle settlement said carrier fluid further textures said settled particles by passing by capillary action radially outward around said settled particles, through said inner surface, and into said mold to be absorbed thereby, whereby a cast tubular greenbody is formed of settled powder particles; stopping rotation of said mold; and removing said greenbody from said mold.