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采用氧一乙炔焰喷熔工艺制备了碳化钨(WC)颗粒增强镍基合金喷熔层,研究了它的腐蚀磨损行为。结果表明:喷熔层耐腐蚀磨损性能随WC含量增加而提高,WC含量在20%~30%范围内,喷熔层耐腐蚀磨损性能最佳,超过30%时,其耐腐蚀磨损性能下降。载荷增加,腐蚀磨损率增大;速度增加,腐蚀磨损率下降。低速重载荷时,WC颗粒增强效果明显,且含30%WC喷熔层耐腐蚀磨损性能最好;高速轻载荷时,因WC原电池效应显著,WC颗粒增强效果减弱。基于人工神经网络的喷熔层腐蚀磨损行为预测与实验结果吻合较好,对喷熔层的应用具有重要指导作用。 相似文献
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研究了用立方氮化硼刀具加工轧机辊道镍基合金喷焊辊子的工艺特点,提出了刀具和机床的选用要点,用以车代磨的方法解决了镍基合金难磨削材料的加工问题. 相似文献
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感应熔覆镍基合金粉末涂层研究 总被引:7,自引:0,他引:7
采用不同的方法分析了感应熔覆镍基合金粉末涂层的性能以及感应涡流在涂层中的分布规律;由GPl00高频感应设备和中频感应设备KGPS—M试验了不同截面形状感应器和不同工艺参数下的熔覆过程;通过电子显微镜和x射线扫描研究了高频和中频下涂层元素分布和基体热影响的差别;测量了高频感应和氧.乙炔喷焊Ni60的极化曲线;采用GCr15与高频感应、激光熔覆和氧-乙炔喷焊GNi—WC25涂层干磨进行了磨损试验。结果表明:高频感应比中频感应致热快。涂层内贫铬组织少,基体热影响小;感应熔覆前需预热200℃且采用单匝圆截面感应器;高频感应Ni60涂层抗蚀性高于氧-乙炔喷焊层,GNi-WC25高频感应涂层耐磨性高于激光熔覆层和氧.乙炔喷焊层。 相似文献
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热喷焊镍基合金具有良好的耐腐蚀性和高的耐磨性,可使易磨损零件的使用寿命大大提高,如油田广泛使用的柱塞,热喷焊的柱塞比35CrMo钢的柱塞,使用寿命提高50倍。但热喷焊镍基合金的磨削相当困难,国内外作了多种磨削方法的研究,这里介绍我们的研究成果以及与多种磨削工艺的比较。当前国内外磨削热喷焊镍基合金,有用普通磨料砂轮的(如刚玉、碳化硅或混合磨料),也有用金刚石磨料砂轮和立方氮化硼磨料砂轮的。据国外文献介绍,用碳化硅和锆玉砂轮的磨削比小于0.5;而用金刚石砂轮,磨削比超过500。对于航空发动机制造或制泵工业中,一些零件的喷焊层,单经磨削还不能满足质量要求,还要用金刚石微粉进行研磨,使表面粗糙度Ra≤0.1微米才行。我国随着热喷焊涂层的推广应用,各单位对涂层的磨削加工也进行了研究,有多种磨削工艺效果较好。如: 1)北京装甲兵工程学院曾对内孔壁上的Ni06、Ni04喷焊层(HRC=50)用金刚石砂轮进行电解磨 相似文献
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钛材上火焰喷焊Ni-WC耐磨涂层的组织和性能 总被引:5,自引:0,他引:5
研究了在钛合金Ti-6Al-4V表面上采用火焰喷焊技术制备镍基碳化钨型自熔性合金涂层的可行性,利用SEM、XRD等手段分析了它的组织和性能。结果表明:采用火焰喷焊技术在钛合金表面上获得了功能梯度涂层,Ni-WC涂层为韧基体+硬质相的耐磨组织,涂层和过渡层之间形成了韧性镍基合金层,在涂层、过渡层和基体之间形成了牢固的冶金结合,涂层的组织和显微硬度沿层深方向呈连续性和渐变性,喷焊表层中WC起到了主要的抗磨作用,涂层磨损失重仅为未喷焊钛合金的1/10。 相似文献
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In this article, the tribological behaviors of tin-based Babbitt alloy ZChSnSb 8–8 sliding against AISI 302 stainless steel lubricated by seawater were investigated. The results indicated that the friction coefficient decreases with increasing load and sliding speed, and the wear rate increases slightly with load but decreases with sliding speed. The low friction coefficient and wear rate are attributed to the unique “concrete structure” and seawater. As a lubrication medium, seawater has lubricating, cooling, and corrosive effects on the sliding couple. 相似文献
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不同铁含量镍-铁合金镀层的摩擦磨损性能 总被引:1,自引:0,他引:1
采用电沉积方法在LY12CZ铝合金表面制备了不同铁含量的镍-铁合金镀层,研究了铁含量对合金镀层硬度和摩擦磨损性能的影响;并根据镀层的磨损形貌探讨了其磨损机理。结果表明:当铁含量低于12.63%(原子分数,下同)时,随着铁含量增加,镀层的硬度增加,摩擦因数减小,耐磨性能提高;当铁含量为由12.63%增至23.59%时,镀层的摩擦因数略有增加,硬度和耐磨性能有所降低;镍镀层的主要磨损机理为显微推碾,随着铁含量的增加,镍-铁合金镀层的磨损机理由显微推碾转变为显微切削。 相似文献
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温度对火焰喷涂FEP涂层制备及摩擦学性能的影响 总被引:1,自引:0,他引:1
利用火焰喷涂在不同预热温度制备了FEP涂层,评价了环境温度对涂层摩擦学性能的影响,并对涂层进行了XRD、SEM等分析。结果表明:FEP涂层的最佳预热温度为270℃,此时涂层与基材的结合面上缺陷很少。FEP粉末和涂层中都含有无定形和结晶相,形成涂层后的结晶度有了明显的提高;环境温度在200℃以下时,涂层摩擦因数变化不大;200℃以后摩擦因数迅速增大,且涂层的磨损率随着环境温度的升高而增大;在较高的环境温度下,涂层的磨损呈现出明显的疲劳磨损特征。 相似文献
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In this article, the tribological behaviors of Cu–30wt% Pb (denoted as CuPb) alloy sliding against aluminum bronze ZCuAl9Mn2 lubricated by seawater were investigated. It was found that the friction coefficients decrease with increasing load and sliding speed, and the wear rates increase slightly with applied load but decrease with sliding speed. The low friction coefficient and wear rate can be attributed to the seawater as a lubrication medium, which has lubricating, cooling, and corrosive effects on the sliding couple. 相似文献
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A series of lubricated pin-on-disk wear experiments were performed to investigate the tribological behaviors of in-line (IN) and staggered (ST) patterned PVD TiN coatings as well as a fully TiN-coated (FC) coating on M2 steel against ASSAB 17 tool steel mating pins. The influence of applied load on the tribological behavior of the individual types of coating was also investigated. The experimental results showed that the tribological behavior of the two patterns and the FC M2 steel sliding against tool steel was a function of applied load. The wear resistance for any PVD TiN coating pattern was relatively higher at the specific individual loadings of 394, 800, 900 and 1100 N for 4 h under wet lubrication. Wear loss of the two types of patterned discs and pins was lower than that of the full coating counterpart. Wear mechanisms are suggested. 相似文献