Patent ID: 7001861

Claim:
A ceramic article having a composition comprising u (Al 2 O 3 —TiO 2 )+v (R)+w (3Al 2 O 3 -2SiO 2 )+x (Al 2 O 3 )+y (SiO 2 )+z (1.1SrO-1.5Al 2 O 3 -13.6SiO 2 —TiO 2 )+a (Fe 2 O 3 —TiO 2 )+b (MgO-2TiO 2 ), where, R is SrO—Al 2 O 3 -2SiO 2 or 11.2SrO-10.9Al 2 O 3 -24.1SiO 2 —TiO 2 , where u, v, w, x, y, z, a and b are weight fractions of each component such that (u+v+w+x+y+z+a+b=1), and 0.5<u≦0.95, 0.01<v≦0.5, 0.01<w≦0.5, 0≦x≦0.5, 0≦y≦0.1, 0≦z≦0.5, 0<a≦0.3, and 0≦b≦0.3.