| 摘要 |
In a spark plug insulator having a sintered ceramic body, the ceramic body has silicon nitride (Si3N4), aluminum nitride (AlN) and alumina (Al2O3), the weight ratio of aluminum nitride (AlN) and alumina (Al2O3) to silicon nitride (Si3N4) being in the range of 0.093 to 1.439; and at least one sintering additive is among the group consisting of yttrium oxide (Y2)3), calcium oxide (CaO), lanthanum oxide (La2O3), magnesia (MgO), cerium oxide (CeO2), scandium oxide (Sc2O3), strontium oxide (SrO), barium oxide (BaO) and neodymium (Nd2O3). The weight percentage of the sintering additive ranges from 0.3% to 15.0% of the total weight of the silicon nitride (Si3N4), aluminum nitride (AlN) and alumina (Al2O3).
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