Patent ID: 6576579
Filing Date: 2003-06-10
Classification: C04B,Y10S

Abstract:
A ceramic comprising a first phase having a general formula R1+(x/2)Zr4P6âˆ’xSixO24 where R is selected from the group consisting of Ba, Ca, and Sr and 0&lE;x&lE;2, wherein the first phase has a volumetric heat capacity (Cp1), and at least 10 weight percent of a second phase having a volumetric heat capacity (Cp2), wherein Cp2>Cp1, wherein the ceramic has a coefficient of thermal expansion from 22Â° to 1000Â° C. of âˆ’15Ã—10âˆ’7/Â° C. to +15Ã—10âˆ’7/Â° C., a permeability of at least 0.25Ã—10âˆ’12 m2, a total porosity of at least 35% by volume, a median pore diameter of at least 6 micrometers, and a volumetric heat capacity Cp(solid) of at least 3.15 J/cm3 K.