不烧不油浸金属-陶瓷复合Al2O3-C滑板的应用研究

Application research of un-fired and non-dipped pitch metal-ceramic bonding Al2O3-C sliding plate

研究开发了不烧不油浸金属-陶瓷复合Al2O3-C滑板,利用XRD、SEM和EDS对用后残砖的物相组成和显微结构进行了分析。结果表明:在使用过程中加入的金属Al粉原位反应生成了非氧化物增强相,其显微结构特征从以碳结合为主转化为以非氧化物及陶瓷结合为主。在使用时工作层的非氧化物和碳被氧化,形成脱碳层,导致结构疏松,强度降低,铸孔处由高温钢水冲刷引起孔径扩大,滑板工作面因机械摩擦造成滑动面拉毛。经批量使用,其寿命与高温烧成Al2O3-ZrO2-C滑板相当,优于高温烧成Al2O3-C滑板。

The un-fired and non-dipped pitch metal-ceramic bonding Al2O3-C sliding plate are developed.The phase composition and microstructure of the residual bricks are analyzed by XRD,SEM and EDS.The results show that the in-site reaction of the added metal Al powder produces a non-oxidized reinforcing phase,and its microstructure is mainly changed from carbon-bonded to non-oxide and ceramic.The non-oxide and carbon of the working layer are oxidized to form a decarbonized layer during use,resulting in loose structure and reduced strength.The hole is enlarged by the casting of high temperature molten steel,and the sliding plate working surface wears due to mechanical friction.The service life of the sliding plate is comparable to that of high temperature fired Al2O3-ZrO2-C sliding plate when used in bulk,which is superior to high temperature fired Al2O3-C sliding plate.