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以球状锌粉和片状锌粉为原始锌粉借助于机械镀工艺制备了无结晶锌防护层,运用光学显微镜(OM)、扫描电子显微镜(SEM)观察了镀层的结构形貌;采用XRD技术分析了镀层的物相组成;采用贴滤纸法进行了镀层的孔隙率测试。研究结果表明,片状锌粉制备的镀层比球状锌粉制备的镀层表面要平滑、光亮。球状锌粉制备的镀层中锌粉颗粒呈紧密堆积,部分锌粉颗粒发生塑性变形;片状锌粉制备的镀层中的锌粉颗粒呈层片状叠加,镀层中锌粉颗粒没有发生明显塑性变形。两种形状锌粉制备的镀层均为锌基多相混合体系,镀层中没有固溶体、化合物等合金相产生,属于锌基复合镀层。锌粉颗粒形状对镀层中颗粒之间的结合机理没有显著影响,两种镀层中锌粉颗粒间均以机械咬合为主。 相似文献
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机械镀镀层制备及性能研究 总被引:4,自引:0,他引:4
用325目电炉球状锌粉并经冷扎处理为片状锌粉分别制备了镀层Ⅰ和镀层Ⅱ,通过扫描电子显微镜(SEM)对该镀层的形貌分析、中性盐雾试验、附着力测试等手段对该镀层的性能进行了研究.结果表明,片状锌粉用于机械镀,锌粉活性明显增强,镀覆效率提高;片状锌粉层层叠加,镀层的耐腐蚀性、表面密封性、可钝化性、镀层光亮度等均有明显改善,具有较好的工业应用价值.
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热镀锌铝稀土及锌镍合金镀层性能的研究 总被引:4,自引:0,他引:4
用光学显微镜、扫描电镜、电子探针等手段分析了我院研制的Zn-5%Al-RE、Zn-Ni合金镀层的性能。实验表明,Zn-5%Al-RE、Zn-Ni合金镀层比纯Zn镀层有极优异的耐腐蚀性能和成形加工性;极薄的合金相层是合金镀层粘附性好的主要原因;镀液中合金元素的加入是提高耐腐性能的重要因素。 相似文献
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研究了稀土Ce对45Cr2NiMoVSi热锻模具钢强度、硬度、塑性和冲击韧性的影响,并在相同的热处理工艺条件下,分别加入5种不同含量Ce后与不添加Ce的45Cr2NiMoVSi钢的力学性能进行对比.结果表明:Ce添加量在适当的范围内可显著提高45Cr2NiMoVSi的强度、硬度、塑性和冲击韧性,并且当Ce添加量为0.22%时,45Cr2NiMoVSi钢可获得最好的综合力学性能. 相似文献
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It was shown in the previous paper that the low coefficients of friction of TiN coatings with (111) preferred grain orientation were measured under dry condition. In this paper, the new Ti-B-N coatings with (111) preferred grain orientation were developed for the industrial application. The coefficients of friction of the Ti-B-N coatings against steel materials were measured by ball-on-disc friction tester. As a result, it was found that the Ti-B-N coatings were able to maintain the low coefficients of friction over long sliding distance under severe sliding condition in comparison with the TiN coatings. It is understood that the Ti-B-N coatings have the possibility of being applied to the sliding parts of industrial machines under dry condition. 相似文献
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CrN coatings have been grown by arc ion plating (AIP) onto Ti6Al4V alloy substrate at various nitrogen pressures (PN2). The goals of this investigation are to study the influence of nitrogen pressure content on the composition, structure and mechanical properties of AIP CrN coatings, as well as their tribological properties. With an increase of PN2, the main phases in the coatings changed from CrN + Cr2N + Cr to CrN, and the texture of CrN was transformed from CrN (111)-oriented to (220)-oriented. Furthermore, the multi-layers including a metal Cr layer, a Cr2N layer and a CrN layer were observed by cross-sectional TEM (XTEM), besides an “unbalanced” state transition layer at the interface of CrN/substrate which was analyzed by nucleation thermodynamics subsequently. An increase in nitrogen pressure also resulted in a change of micro-hardness due to the variation in composition and structure. Finally, the tribological properties of the Ti6Al4V substrate and the CrN/Ti6Al4V coating system have also been explored, which shows that CrN coatings can act as good wear resistance layer for Ti6Al4V substrate. 相似文献
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系统研究了钎焊CBN工具用稀土元素La改性Ag-Cu-Ti钎料合金的熔化温度、微观组织、显微硬度及钎料与45钢基体钎焊接头抗剪强度.结果表明,稀土元素La对Ag-Cu-Ti钎料合金的熔点影响很小,但是可以促进钎料的合金化,提高其合金化程度,稀土La加入量不超过0.5%(质量分数)时可以改善Ag-Cu-Ti钎料合金的微观组织,使金属间化合物分布更加均匀,提高Ag-Cu-Ti钎料合金的显微硬度,还可以明显改善钎料与45钢基体的钎焊接头抗剪强度. 相似文献
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本文采用电弧离子镀沉积NiCrAlY涂层,探讨NiCrAlY涂层作为阻尼涂层的可行性并研究涂层的阻尼测试方法和阻尼特性。本文采用X射线衍射和扫描电镜等手段分别对涂层的物相结构、表面形貌以及化学成分进行了测试表征。而涂层阻尼的测试则采用动态机械分析仪和正弦扫频的方法进行,实验结果表明NiCrAlY涂层能明显提高样品的阻尼性能。 相似文献
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采用电弧离子镀技术在模具钢H13表面沉积CrxTi1-xN涂层,系统研究了不同Cr/Ti原子比对CrTiN合金化涂层结构、力学性能以及耐腐蚀性能的影响。结果表明:通过改变分离靶弧流实现CrTiN涂层中Cr/Ti原子比的有效调控,所制备的CrTiN涂层主要由面心立方结构(Cr, Ti)N和CrN组成,随着Cr/Ti原子比从1.1增加至1.8,涂层相结构由随机取向向(111)晶面优先生长转变。CrTiN合金化涂层显微硬度较CrN涂层得到明显提升,并随着固溶引起的晶格畸变程度变化而具有一个极大值。通过电化学阻抗谱和动电位极化曲线分析,当Cr/Ti原子比为1.4时,致密的Cr0.59Ti0.41N涂层具有最佳的耐腐蚀性能。 相似文献
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采用力学性能测试、疲劳断口形貌及裂纹源非金属夹杂物扫描电镜分析等方法,研究了稀土元素La对300M钢常规力学及高周疲劳性能的影响,以及稀土La对300M钢非金属夹杂物形态及尺寸的改性作用。结果表明:添加0.006%(质量分数)的稀土La对300M钢的常规力学性能影响较小,却显著提高300M钢的高周疲劳性能;300M钢加入稀土La后,其疲劳极限σ-1由867 MPa提高至940 MPa;添加稀土La改性后的钢中夹杂物尺寸变大,并转变为含S、O的稀土夹杂物,其硬度、弹性模量、膨胀系数与钢基体更接近,有效减小了夹杂处的应力集中,有利于提高钢的高周疲劳性能。 相似文献