共查询到20条相似文献,搜索用时 125 毫秒
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选择感应等离子体工艺对球形碳化钨粉进行了研制,混合镍合金粉后研制成球形镍基碳化钨粉。采用等离子体转移弧堆对耐磨耐蚀涂层进行制备,这一涂层的性能主要为耐酸、防锈、耐热以及抗磨损等。因为涂层内具有较高碳化钨含量,有助于机械零件耐蚀性与耐磨性的提升,在深海石油钻采中的应用前景广阔。 相似文献
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超音速火焰喷涂碳化钨钴合金涂层对橡胶密封件的磨损研究 总被引:1,自引:0,他引:1
通过磨合试验,比较了超音速火焰(HVOF)喷涂碳化钨钴合金涂层与传统的含氰镀铬镀层与橡胶密封件对磨时的磨损情况.结果表明:HVOF喷涂碳化钨钴合金涂层具有良好的耐磨性和致密性,始终保持较良好的表面状况,对非金属密封件具有良好的适应性. 相似文献
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采用原子沉积法(Atomic Layer Deposition,ALD)分别在点状微织构和条状微织构YT5硬质合金刀具(微织构刀具)上制备了纳米Al_2O_3涂层,通过直角切削实验研究了纳米Al_2O_3涂层对微织构刀具刀-屑界面间摩擦系数的影响,并将纳米Al_2O_3涂层微织构刀具与微织构刀具、YT5硬质合金刀具进行对比。结果表明,微织构能降低刀具刀-屑界面间的摩擦系数;纳米Al_2O_3涂层能进一步降低微织构刀具刀-屑界面间的摩擦系数,其中厚度为100 nm的Al_2O_3涂层微织构刀具刀-屑界面间的摩擦系数最小,当点状微织构间距为0.15 mm时摩擦系数值最优,当条状微织构方向垂直于主切削刃时摩擦系数值最优;刀具刀-屑界面间的摩擦系数随着切削速度的增加而增大。纳米Al_2O_3涂层与微织构相结合将刀-屑界面间的摩擦由滑动摩擦转变为滑动-滚动复合摩擦的形式,降低了微织构刀具刀-屑界面间的摩擦系数,改善了摩擦性能,有利于提高刀具耐用度。 相似文献
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将纳米α-Al2O3颗粒或Ni包裹的纳米α-Al2O3复合粉和镍基粉用湿法混合,采用火焰热喷涂工艺制备了复合涂层,用磨粒磨损试验机进行磨损试验,研究了纳米α-Al2O3的体积分数、粒径和是否预先进行包裹处理对涂层喷焊性和耐磨粒磨损性能的影响。结果表明,纳米α-Al2O3以包裹形式加入能有效改善弥散相与Ni基涂层的相容性,相应涂层的耐磨性优于未包裹处理;当纳米Al2O3的体积分数为2%时,涂层的耐磨性能最好,为Ni基涂层的2倍多;在相同的体积分数下,随着涂层中弥散强化相尺寸的减小,涂层的耐磨性提高。 相似文献
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使用热丝化学气相沉积(HFCVD)装置,在以WC - CO硬质合金为衬底,采用调节涂层生长参数,制备出性能优良的微/纳米金刚石涂层.用SEM,AFM,Raman表征微观结构和表面品质.采用压痕法评估涂层的结合性能,并与微米金刚石涂层、纳米金刚石涂层进行比较.结果显示,当生长气压由3.3 kPa降为1.0 kPa时,底层的微米级晶粒逐渐被上层纳米级晶粒覆盖,并且涂层表面显露出纳米金刚石涂层特性.在结合性能实验中也指出,微/纳米金刚石涂层的结合性能比纳米金刚石涂层要优异. 相似文献
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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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等离子喷涂WC/Co Fe基涂层摩擦与磨损性能 总被引:1,自引:0,他引:1
以普通铸铁为基体,碳化钨陶瓷粉末WC 12Co为热喷涂材料,采用大气等离子法制备WC/Co Fe复合涂层.通过SEM、EDS、XRD等手段对WC/Co Fe涂层微观组织与结构进行表征,并对WC/Co Fe复合涂层耐磨损性能进行测试.结果表明,等离子喷涂制备的WC/Co Fe涂层物相以WC相为主;WC涂层摩擦因数波动小于铸铁材料摩擦因数,表明WC复合涂层具有良好的抗摩擦性能.WC涂层耐磨损性能高于铸铁,主要归因于WC颗粒韧性好、硬度高、抗冲击及抗磨损性能强,与基体金属的结合性好. 相似文献
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超音速火焰喷涂微米和纳米结构WC-12Co涂层及其性能 总被引:4,自引:0,他引:4
以纳米和微米级WC-12Co粉末为原料,采用超音速火焰喷涂(HVOF)方法在16Mn基体上制备了两种涂层.利用X射线衍射仪对喷涂粉末及涂层进行了相结构分析,用扫描电镜对喷涂粉末、磨粒磨损前后的涂层表面形貌进行了观察,探讨了粉末结构、涂层的组织和结构以及抗磨粒磨损的性能.结果表明:WC-12Co粉末结构对涂层的组织结构影响非常显著,微米WC-12Co粉末中的WC的分解基本上得到了抑止,而纳米结构的粉末由于出现了WC的部分分解,导致了纳米涂层的抗磨粒磨损性能相对于微米涂层提高不多,但是与基体16Mn相比,两种涂层均表现出优异的抗磨粒磨损性能. 相似文献
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激光重熔纳米SiC复合陶瓷涂层组织和性能研究 总被引:8,自引:0,他引:8
研究了WC/Co-NiCrAl等离子复合陶瓷涂层、激光重熔等离子涂层、激光渗入纳米SiC涂层的组织结构、耐磨性能。结果证明:在所定的工艺参数下,等离子喷涂层组织呈层片状,层间为机械结合界面;经激光重熔后,激光作用区涂层组织细化,孔隙率降低,耐磨性能是原等离子涂层的1.3倍;渗入纳米SiC后,组织进一步细化,孔隙率进一步降低,SiC颗粒仍处于纳米尺度,分布在粗颗粒表面及粗颗粒之间,其耐磨性能是原等离子涂层的2.6倍。 相似文献
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Sliding wear behavior of Fe-Al and Fe-Al/WC coatings prepared by high velocity arc spraying 总被引:1,自引:0,他引:1
A comparative study was carried out to investigate the microstructure and tribological behavior of Fe-Al and Fe-Al/WC iron aluminide based coatings against Si3N4 under dry sliding at room temperature using a pin-on-disc tribotester. The coatings were prepared by high velocity arc spraying (HVAS) and cored wires. The effect of normal load on friction coefficient and wear rate of the coatings was studied. The microstructure and the worn surfaces of the coatings were analysed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersion spectroscope (EDS). The results showed that, the main phases in both coatings were iron aluminide (Fe3Al and FeAl) and α. WC/W2C particles were embedded in the matrix of the composite coating. With adding WC hard particles, the Fe-Al/WC composite coating exhibited higher wear-resistance than Fe-Al coating. But the friction coefficient of both coatings showed little difference. As the load increased, the friction coefficient decreases slightly due to a rise of friction contact temperature and larger areas of oxide film formation on the worn surface, which act as a solid lubricant. Increasing load causes the maximum shear stress occurring at the deeper position below the surface, thereby aggravating the wear. The coating surface is subjected to alternately tensile stress and compression stress during sliding, and the predominant wear mechanism of the coatings appears to be delamination. 相似文献
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基体表面粗糙度对纳米复合镀层组织及性能的影响 总被引:1,自引:0,他引:1
采用电刷镀技术在不同表面粗糙度的W18Cr4V高速钢基体上制备了纳米PTFE和纳米WC颗粒增强的镍基复合镀层,采用扫描电镜对纳米复合镀层的表面和截面形貌进行了观察,研究了基体表面粗糙度对纳米复合镀层耐磨性、耐蚀性和结合强度的影响.结果表明:随着基体表面粗糙度的减小,纳米复合镀层的表面更加平整致密,组织更加细小均匀,镀层厚度减小,镀层中的裂纹数量减少,镀层的耐磨性、耐蚀性和结合强度均得到明显提高. 相似文献
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Satpal Sharma 《The International Journal of Advanced Manufacturing Technology》2012,61(9-12):889-900
In the present investigation, Ni–WC composite powder was modified with the addition of CeO2 in order to form a new composition of Ni–WC–CeO2. The Ni–WC and Ni–WC–CeO2 compositions were used for coating deposition by high-velocity oxy-fuel (HVOF) spraying process so as to study the effect of CeO2 addition on microstructure, distribution of various elements, hardness, formation of new phases, and abrasive wear behavior. Further, the effect of load, abrasive size, sliding distance, and temperature on abrasive wear behavior of these HVOF-sprayed coatings was investigated by response surface methodology. To investigate the abrasive wear behavior of HVOF-sprayed coatings four factors such as load, abrasive size (size in micrometers), sliding distance (meters), and temperature (°C) with three levels of each factor were investigated. Analysis of variance was carried out to determine the significant factors and interactions. Investigation showed that the load, abrasive size, and sliding distance were the main significant factors while load and abrasive size, load and sliding distance, abrasive size and sliding distance were the main significant interactions. Thus an abrasive wear model was developed in terms of main factors and their significant interactions. The validity of the model was evaluated by conducting experiments under different wear conditions. A comparison of modeled and experimental results showed 4–9% error. The abrasive wear resistance of coatings increases with the addition of CeO2. This is due to increase in hardness with the addition of CeO2 in Ni–WC coatings. 相似文献
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The study deals with tribological properties of the nanostructured WC-12%Co coatings deposited by the detonation method. It is found experimentally that their wear resistance depends on the concentration of monocarbide WC. The dependence of the WC concentration in the coating on deposition conditions is obtained. The microstructure of the coatings, their physical-mechanical properties, phase composition, porosity, hardness, and modulus of elasticity are studied. The advantage of the nanostructured coatings over the coatings deposited from micropowders is shown. 相似文献