发明名称 |
Ceramic for ignition device insulator with low relative permittivity |
摘要 |
A ceramic insulator for surrounding an electrode of an ignition device, such as a corona igniter or spark plug, is provided. The insulator is formed of a ceramic material including alumina in an amount of 28 to 38 wt. %, silica in an amount of 57 to 67 wt. %, and calcium oxide in an amount of 3 to 7 wt. %, based on the total weight of the ceramic material. The ceramic insulator is typically formed by firing a mixture of Kaolin, calcium carbonate, and silica, wherein the calcium carbonate acts as a flux during firing. The ceramic material has a relative permittivity of about 5.5 to 6.5 and thus improves the electrical efficiency of the ignition device. The ceramic material is also capable of withstanding temperatures of 900 to 1000° C. and has excellent thermal shock resistance, making it suitable for use in internal combustion engines. |
申请公布号 |
US9054502(B1) |
申请公布日期 |
2015.06.09 |
申请号 |
US201414452802 |
申请日期 |
2014.08.06 |
申请人 |
Federal-Mogul Ignition Company |
发明人 |
Walker, Jr. William J. |
分类号 |
C04B35/195;H01T13/20;H01T13/38 |
主分类号 |
C04B35/195 |
代理机构 |
Dickinson Wright, PLLC |
代理人 |
Stearns Robert L.;Dickinson Wright, PLLC |
主权项 |
1. An insulator for an ignition device, comprising:
a ceramic material including alumina in an amount of 28 to 38 wt. %, silica in an amount of 57 to 67 wt. %, and calcium oxide in an amount of 3 to 7 wt. %, based on the total weight of said ceramic material. |
地址 |
Southfield MI US |