I目录摘要......................................................................IAbstract...................................................................II第一章绪论...............................................................11.1选题的背景及意义....................................................11.1.1化学热处理技术.................................................11.1.2电刷镀技术.....................................................21.1.3热喷涂技术.....................................................41.1.4气相沉积镀膜...................................................71.2电火花沉积..........................................................81.2.1电火花沉积工艺的发展概况.......................................91.2.2电火花沉积的理论研究现状......................................101.2.3电火花沉积工艺的发展趋势......................................121.3研究内容及方法......................................................131.3.1研究内容......................................................131.3.2测试工具......................................................13第二章电火花沉积原理及沉积设备............................................142.1电火花沉积原理、过程及特点.........................................142.1.1电火花沉积原理................................................142.1.2电火花表面强化的沉积过程......................................142.1.3电火花沉积强化的特点..........................................152.2沉积设备的结构.....................................................162.3电火花沉积材料的选择...............................................17第三章实验过程及分析......................................................193.1表面预处理........................................................193.2基材的选取与制备..................................................193.2.1试样沉积......................................................203.2.2沉积层线切割..................................................223.2.3镶样处理......................................................22II3.2.4后期处理......................................................233.3实验方法...........................................................253.4实验结果与分析.....................................................273.4.1电火花沉积层显微观察..........................................273.4.2电火花沉积层成分分析..........................................283.4.3电火花沉积层相结构分析........................................293.4.4电火花沉积层随时间变化规律.........................................................................293.6本章小结...........................................................32第四章结论...............................................................33参考文献...................................................................34致谢.....................................................错误!未定义书签。附录一任务书..............................................................36附录二开题报告.............................................错误!未定义书签。附录三中文译文.............................................错误!未定义书签。附录四外文原文.............................................错误!未定义书签。I摘要本文通过采用新型电火花沉积设备,以WC-Co硬质合金为电极材料,以H13钢为基体材料进行电火花沉积工艺实验。通过工艺试验,研究沉积时间对沉积层厚度的影响规律,用X射线衍射仪分析沉积层的组织结构,通过硬度实验和抗磨损实验测定沉积层的硬度和抗磨损性能,得出电火花沉积时间对沉积层相结构产生影响。由实验结果分析可知,基材(H13钢)在随时间变化沉积时,沉积层厚度并不是随着时间的延长而无限增厚,达到一定厚度后延长沉积时间反而会使沉积层变薄;通过金相照片可以看见白亮层情况恶化,沉积层破碎减薄,孔隙较多,产生撕裂、碎化的倾向更严重,有的地方出现脱落现象,沉积层质量较差;经过电火花沉积强化后,沉积层的硬度和抗磨损性能提高。电火花沉积后组成工件和电极的各元素均发生扩散和移动,在极短的时间内形成分布,工件元素和电极元素呈一定的梯度分布。关键词:电火花沉积;WC-Co沉积层;沉积层厚度;沉积时间IIAbstractThenewsparkdepositionequipmentusesWC-Cocarbideaselectrodematerials,andH13steelassubstratematerialtomakesparkdepositionprocessexperiments,whichleadstoamorein-depthstudyabouttheorganizationalstructureoftheelectricsparkdepositionlayer.Throughtheprocesstest,effectofdepositiontimeondepositionlayerthickness,microstructureofdepositedlayerbyXraydiffraction,hardnessandwearresistanceoftheexperimentaldeterminationofthehardnessofdepositedlayerexperimentandwearresistance,theelectricsparkdepositiontimeimpactonphasestructureofsedimentarylayer.Fromtheanalysisofexperimentalresults,thesubstrate(H13steel)inthechangewithtimeofdeposition,depositionlayerthicknessandnotwiththeextensionoftimeandinfinitethickening,prolongthedepositiontimereachesacertainthicknessbutwillmakethedepositionlayerbecomesthinner;throughmetallographicphotoscanseewhitebrightlayerconditionworsens,sedimentarylayerbreakingthinning,poremore,haveapropensitytotearing,breakingthemoreserious,sheddingphenomenonappearedinsomeplaces,thepoorqualityofthedepositionlayer;Aftertheelectricsparkdepositionstrengthening,coatinghardnessandabrasionresistance.Theelementalcompositionofworkpieceandelectrodesparkdepositionoccurredafterthediffusionanddistributionofmobile,formedinaveryshortperiodoftime,acertaingradientdistributionofworkpieceandelectrodeelementsareelements.Keywords:sparkdeposition;WC-Cocoatings;Sedimentthickness;depositiontime1华北水利水电学院毕业论文第一章绪论1.1选题的背景及意义自改革开放以来,工业技术的发展极大的推动了我国经济的崛起。其中,在各表面加工行业中,设备的表面由于长期接触高温高压,雨雪天气,以及高速重载等相对恶劣的环境中,因此一些大型设备和关键设备的部件很容易收到侵蚀、磨损和破坏,对生产加工的进度和精度等产生了极大的影响,也影响了经济效益。在以往,由于工具的加工表面以及一些细微零件的表面磨损失效,腐蚀,开裂等引起产品不合格的事故时有发生。因此,对于设备的表面,各行业都非常重视其性能,对其性能也提出了相当高的要求。因此,为了增加经济效益,提高产品的质量和性能,以及工具的寿命,对加工工具和零件的表面进行强化处理已经迫在眉睫,各行业也急需这方面技术的研究。在传统的表面加工工艺研究中,很难达到目前加工行业的要求水准,一种崭新的表面强化处理技术呼之欲出。出现的技术之一是零件表面强化处理,这可以有效的提高零件和加工工具的使用寿命和实用性。在这技术当中,激光、