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反应热压烧结Si3N4基陶瓷及其性能
作者:苏国康 谭大旺 郭伟明 吴利翔 林华泰 伍尚华 
单位:广东工业大学机电工程学院 广州 510006 
关键词:氮化硅 六方氮化硼 导电性能 电火花加工 机械加工 
分类号:TQ174.1
出版年,卷(期):页码:2017,45(6):823-828
DOI:10.14062/j.issn.0454-5648.2017.06.11
摘要:

 以60%(质量分数)Si3N4和30%ZrB2为主要原料、10%Al2O3–Y2O3为助剂,通过反应热压烧结制备可电火加工和机械加工的Si3N4基陶瓷。结果表明:在1 600 ℃氩气和真空环境下ZrB2均可以与Si3N4发生完全的化学反应,获得Si3N4–ZrSi2–ZrN–BN陶瓷。由于导电相ZrSi2和ZrN的形成,Si3N4基陶瓷具有较优异的导电性能,适合电火花线切割加工。然而,在氩气和真空环境下反应生成的h-BN具有不同的显微形貌,导致在氩气环境下制备的Si3N4基陶瓷具有良好的钻孔可加工性,在真空环境下制备的Si3N4基陶瓷具有较差的钻孔可加工性。因此,在氩气下反应热压烧结制备的Si3N4基陶瓷具备良好的可电火花加工和机械加工性能。

 

 Si3N4-based ceramic was prepared by reactive hot pressing using 60%Si3N4 and 30%ZrB2 as raw materials and 10%Al2O3–Y2O3 as sintering aids. The electrical discharge and machinable properties were determined. The results show that Si3N4–ZrSi2–ZrN–BN ceramic is obtained via the reaction between ZrB2 and Si3N4 in both argon and vacuum environments at 1 600 ℃. Due to the formation of ZrSi2 and ZrN phases, reactive hot-pressed Si3N4-based ceramic exhibits a good electrical conductivity, which is suitable for wire electrical discharge machining (W-EDM). However, the h-BN particles formed in argon and vacuum environments have different morphologies, leading to different drilling machinabilities of Si3N4-based ceramic. The Si3N4-based ceramic hot-pressed in argon has a good machinability, whereas the Si3N4-based ceramic hot-pressed in vacuum has a poor machinability. As a result, the Si3N4-based ceramic reactively hot-pressed in argon has both good EDM and machinability.

 
基金项目:
广东省引进创新科研团队计划(2013G061);国家自然科学基金(51402055)资助。
作者简介:
苏国康(1994—),男,本科生。
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