火花塞陶瓷绝缘体高温分流电阻的研究

Research of Shunt Resistance of Spark Plug Ceramic Insulator at High Temperature

火花塞陶瓷绝缘体的高温分流电阻会影响火花塞的使用性能和寿命,笔者研究了氧化铝中Na2O含量、配方组成和烧结温度对火花塞陶瓷绝缘体高温分流电阻的影响。结果表明:随着氧化铝原材料中Na2O含量的增加,试样的高温分流电阻逐渐降低;在配方组成中,当CaO的含量由33%增加至40%,氧化铝原材料中Na2O含量为0.1%时,试样在500℃时的分流电阻由517MΩ提升至1 192MΩ;烧结温度低于1 580℃时,试样的高温分流电阻较低。

The performance and life of the spark plug was influenced by shunt resistance of ceramic insulator at high temper-ature .In the present work ,the effect of Na2 O content in the alumina ,formula composition and sinter - ing temperature on shunt resistance of ceramic insulator at high temperature was studied .The results indicate that ,the shunt resistance of ce-ramic insulator at high temperature decreased with the increase content of Na 2 O in the alumina raw material ;the shunt re-sistor at 500 ℃ increased from 517 MΩ up to 1 192 MΩ when the CaO content of formula increased from 33% to 40% with alumina contained 0 .1% Na2O ;the shunt resistance at high temperature was low when the sintering temperature of ceramic insulator was below 1 580 ℃ .