共查询到20条相似文献,搜索用时 218 毫秒
1.
用化学复合镀的方法,把聚四氟乙烯(PTFE)作为第二相加入到化学镀钴、磷镀液中得到复合镀层.改变还原剂次亚磷酸钠和全氟表面活性剂(FC- 400)在镀液中的相对浓度,得到各种镀层表面成分;利用摩擦磨损试验机、电化学综合测试仪、X射线光电子能谱(XPS)和扫描电子显微镜等分析复合镀层的摩擦磨损性能、耐腐蚀性能、表面形貌特性.结果表明:通过化学复合镀的方法得到钴、磷、聚四氟乙烯复合镀层,其平均厚度约为54 μm,平均接触角(对纯净水)约为72°;随着次亚磷酸钠和FC- 400浓度的增加,复合镀层摩擦因数明显变小,其抗磨损性能增加;随着FC- 400浓度的增大,镀层的耐腐蚀性能变好,而随着次亚磷酸钠的浓度增大,腐蚀电流增加,镀层的腐蚀性能变差;复合镀层中主要含有Co、P、C、F元素,其中Co以单质的形态出现,元素F的出现,说明聚四氟乙烯已沉积到复合镀层中. 相似文献
2.
用电沉积方法在316L不锈钢表面制备了纯镍镀层和纳米SiC/Ni复合镀层,考察了电镀时间、SiC质量浓度、电流密度和镀液温度对复合镀层中纳米SiC含量的影响,表征了镀层的表面形貌和SiC纳米颗粒的尺寸;最后研究了镀层的摩擦磨损性能。结果表明:复合镀层中纳米SiC的含量随着电镀时间延长、电流密度增大、镀液温度升高以及SiC质量浓度的增大先升高后降低,且最佳工艺参数为电镀时间30min,SiC质量浓度20g·L-1,电流密度2A·dm-2,镀液温度60℃,镀液pH4.5,搅拌速度300r·min-1;与纯镍镀层相比,纳米SiC/Ni复合镀层的晶粒更细小,组织更致密,具有更好的摩擦磨损性能,摩擦因数降低了7%以上,磨损率降低了50%。 相似文献
3.
4.
5.
6.
7.
通过化学沉积法在MoS2颗粒表面形成一层氧化铝,采用化学复合镀覆的方法制备Ni-P-MoS2/Al2O3复合镀层。研究复合镀液中MoS2颗粒含量和搅拌速度对复合镀层显微硬度及摩擦磨损特性的影响,比较由MoS2改性方式和添加分散剂方式获得镀层的性能,分析复合镀层的横截面及表面形貌。结果表明:随着MoS2颗粒含量和搅拌速度增加,镀层显微硬度、摩擦因数、耐磨性均先减小后增大。与添加分散剂制备的Ni-P-MoS2复合镀层相比,改性颗粒获得的Ni-P-MoS2复合镀层的自润滑性、显微硬度、耐磨性均有所提高。 相似文献
8.
在传统的镍磷化学复合镀液中加入纳米SiC粒子,即Ni-P-SiC(纳米)化学复合镀工艺是一项新型的、很有前景的模具表面处理技术。这种方法能进一步提高镀层表面的硬度和耐磨性。采用正交试验方案对45号钢板进行Ni-P-SiC(纳米)化学复合镀工艺试验,归纳和分析了纳米SiC粒子浓度、施镀温度、搅拌速度、镀液PH值4个工艺参数对镀层硬度的影响规律,由正交工艺试验结果推导出最优工艺参数组合。工艺试验得到的镀层硬度值表明优化结果正确。 相似文献
9.
10.
利用化学沉积方法对表面改性后的碳纳米管进行进行镍包覆,在Ti(C,N)基金属陶瓷中添加不同含量的碳纳米管作为增强相,采用粉末冶金法制备了碳纳米管增强的Ti(C,N)基金属陶瓷材料;研究了碳纳米管的表面改性、加入量及烧结温度对金属陶瓷性能的影响。结果表明:当pH值为4.5时得到的镍镀层比pH值为9时得到的镍镀层连续光滑;当碳纳米管含量由0增加到0.5%(质量分数)时,Ti(C,N)基金属陶瓷的抗弯强度随碳纳米管含量的增加而升高,1 420℃烧结时,其抗弯强度最大。 相似文献
11.
12.
13.
两种化学复合镀层的耐磨性能之比较 总被引:2,自引:0,他引:2
本文用化学复合镀技术,在45钢基体上沉积了镍-磷-巴基管和镍-磷-碳化硅两种复合镀层。作者详细实验研究了此两种复合镀层的摩擦,磨损工进行了比较。结果表明,两种复合镀层均具有优异的耐磨特性。并且镍-磷-巴基管复合镀层的耐磨特性更佳。 相似文献
14.
采用激光熔覆技术在45钢样品表面制备了Ni/TiC复合涂层,利用光学显微镜、SEM,EDS,XRD、显微镜硬度计及摩擦磨损试验机等检测设备研究了Ni/TiC复合涂层的组织和性能。试验结果表明:Ni/TiC复合涂层没有出现裂纹、孔洞等缺陷,涂层与基体之间具有良好的冶金结合,涂层显微硬度沿层深皆呈明显的阶梯状分布,最外表面的熔覆层硬度最高,约为800 HV;熔覆试样的比磨损率比基体试样的比磨损率下降了86.5%,表明Ni/TiC复合涂层具有较好的耐磨性能。 相似文献
15.
Carbon nanotubes (CNT) have received considerable interest in many industries, but composite coatings of CNTs have not yet been sufficiently developed for use in biomedical implants. This investigation elucidates the wear and corrosion behavior of electroplated Ni/CNT composite coatings on Ti–6Al–4V alloy in Hanks’ solution. Experimental results indicate that the CNTs in an electroplated Ni/CNT composite coating increase its hardness to 98.5% higher than that of a pure Ni coating. Additionally, an Ni/CNT composite coating can form stable and dense passive film, which significantly improves wear and corrosion in Hanks′ solution. 相似文献
16.
利用化学镀的方法在GCr15钢的基体上沉积了N i-P-SiC-MoS2复合镀层,借助于扫描电镜、X衍射分析仪、显微硬度计、M-2000型磨损试验机等设备对复合镀层的表面形貌、成分、结构、硬度及其耐磨性等作了综合分析。结果表明,SiC、MoS22种粒子同时加入N i-P合金基质中所得到的N i-P-SiC-MoS2复合镀层镀态时为非晶态结构,且复合镀层的硬度低于N i-P-SiC而高于N i-P-MoS2镀层;N i-P-SiC-MoS2复合镀层摩擦磨损性能最好,是一种具有良好耐磨性及自润滑性的复合镀层。 相似文献
17.
18.
Dry friction and wear characteristics of nickel/carbon nanotube electroless composite deposits 总被引:3,自引:0,他引:3
X.H. Chen C.S. Chen H.N. Xiao H.B. Liu L.P. Zhou S.L. Li G. Zhang 《Tribology International》2006,39(1):22-28
Ni/carbon nanotube (Ni/CNTs) composite coatings were deposited on carbon steel plate by electroless deposition. The friction and wear properties were examined under dry sliding conditions using the ball-on-disk configuration. For reference, carbon steel plate was coated with Ni, Ni/SiC and Ni/graphite. The results show that the Ni/CNT coating has a microhardness value of 865 Hv, greater than for SiC reinforced composite deposits. The Ni/CNTs composite coating possesses not only a higher wear resistance but also a lower friction coefficient, resulting from their improved mechanical characteristics and the unique topological structure of the hollow nanotubes. 相似文献
19.
The present contribution reports the tribological properties of Ni–WC composite coatings, electrodeposited on steel substrate. Commercial WC particles with an average size of 5 μm were codeposited with Ni on a mild steel substrate using a Watts bath at 50°C. The effect of plating variables on deposition behavior was studied. The amount of WC in the deposited layer decreased and plating efficiency increased with an increase in current density from 0.1 to 0.3 A/cm2. The tribological properties of the coatings were studied using a small amplitude reciprocating friction wear tester. The addition of WC in Ni increases the microhardness of the electrodeposited coatings. An important result is that the presence of embedded WC particles in the electrodeposited coatings results in a much lower coefficient of friction (COF) of 0.34, when compared with pure Ni (COF 0.62) and mild steel (COF 0.54). 相似文献
20.
This paper investigates the microstructure and wear resistance of nickel–carbon nanotube (CNT) composite coating deposited by brush plating technique. The Ni/CNT coating deposited with a pulse current source has less porosity, higher hardness and higher wear resistance than that with a DC source. CNTs greatly improve the coating performance. The wear mechanism is mainly the smearing of the Ni/CNTs coatings, instead of the fracture for the Ni coatings. 相似文献