| 摘要 |
An improved ceramic article useful after firing as an electrical suppressor element, especially suitable for use in spark plugs, is disclosed. The suppressor element is a copper-aluminum composition modified with a mangesium, calcium, strontium or barium metal compound. The numerical value of the atom ratio of the article, Cu/M+ Al WHERE M represents magnesium, calcium, strontium or barium is from 0.5 to 4. The atom ratio of M to Al is from about 0.5:1 to 2.0:1. The temperature coefficient of resistance of the suppressor, defined by (R2) (1) n = 2.303 log x 100 in %/ DEG C (R1) (T2 - T1) is between about -0.1%/ DEG C and -1.0%/ DEG C. |
