Patent ID: 8614542
Filing Date: 2013-12-24
Classification: C04B,H01T

Abstract:
1. A ceramic material for an insulator of a spark plug comprising, in weight percent (wt %) of said ceramic material, aluminum oxide (Al at least one oxide of a Group 2 alkaline earth metal (Group 2 oxide) in an amount of 0.16 wt % to 0.70 wt %; said at least one Group 2 oxide including at least one of calcium oxide (CaO), magnesium oxide (MgO), beryllium oxide (BeO), strontium oxide (SrO), barium oxide (BaO), and radium oxide (RaO); silicon dioxide (SiO at least one oxide of a Group 4 transitional metal (Group 4 oxide) in an amount of 0.01 wt % to 0.16 wt %, said at least one Group 4 oxide including at least one of zirconium oxide (ZrO at least one oxide of a Group 1 alkali metal (Group 1 oxide) in an amount less than 0.0060 wt %; said at least one Group 1 oxide including at least one of potassium oxide (K