共查询到18条相似文献,搜索用时 140 毫秒
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镍-磷-氧化铝复合化学镀层的耐磨性研究 总被引:7,自引:2,他引:7
将微粒三氧化二铝与镍-磷化学镀液复合,使三氧化二铝微粒均匀地弥散分布于镍-磷基体中,以提高镀层的耐磨性.着重研究了复合化学镀工艺条件和镀后热处理温度对Ni-P-Al2O3复合镀层耐磨性的影响.试验结果表明:施镀工艺对镀速、三氧化二铝在镀层中的分布有影响,镀后热处理可提高镀层硬度.在pH=5.4、施镀温度为90±2℃、α-Al2O3微粒加入量为5g/L、搅拌速度为400r/min的条件下所得复合镀层加热到400℃、保温1 h后,镀层耐磨性最佳.在相同的磨损条件下,复合镀层的耐磨性比Ni-P镀层提高6~7倍,比45钢淬火态提高30多倍. 相似文献
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化学镀Ni-P/纳米Al2O3复合镀层结构及性能研究 总被引:1,自引:0,他引:1
通过化学复合镀工艺制备了Ni-P/纳米Al2O3复合镀层.利用扫描电子显微镜(SEM)和X射线衍射(XRD)对复合镀层的表面形貌及结构进行了测试,研究了纳米Al2O3添加剂、Al2O3复合量质量分数、热处理等工艺条件对Ni-P/纳米Al2O3复合镀层结构与性能的影响.结果表明,Ni-P/纳米Al2O3复合镀层的硬度和耐磨性高于Ni-P合金镀层,而且随着Al2O3复合量的增大镀层硬度和耐磨性增加.当纳米Al2O3复合量质量分数为10.1%时,Ni-P/纳米Al2O3复合镀层的硬度较Ni-P合金镀层增大28%,磨损失重减少20%以上.400℃热处理后,复合镀层结构由非晶态转变为晶态,镀层硬度由570 HV增大到1 185 HV,耐磨性也进一步提高. 相似文献
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Al2O3/Ni功能梯度材料电沉积工艺的研究 总被引:3,自引:1,他引:2
功能梯度材料的组成和结构呈梯度变化并呈适应使用环境要求的梯度分布.在瓦特型镀镍溶液中,利用复合电沉积的技术,制备了Ni/Al2O3梯度镀层.通过改变镀液中Al2O3颗粒的浓度、阴极电流密度、镀液的搅拌速度3种工艺参数,研究了Al2O3颗粒在形状为正八面体的阴极上的复合镀层的分布规律.对Al2O3颗粒在复合镀层内的含量进行了测量并对镀层断面的金相照片进行了观察和分析,得出了制备梯度镀层的最佳工艺.试验结果表明,在适当的工艺参数下,通过旋转阴极,能够制取Ni/Al2O3梯度镀层.为制备梯度复合材料提供了一种新的方法. 相似文献
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利用喷射电沉积工艺制备了Ni-Al2O3纳米复合镀层,分析了纳米Al2O3颗粒添加量、阴极电流密度以及电解液喷射速度对复合镀层中纳米颗粒含量的影响,采用扫描电镜(SEM)以及X-射线衍射仪对复合镀层的微观形貌进行了分析,研究了复合镀层中纳米颗粒含量对其显微硬度、结合强度、耐腐蚀性的影响。结果表明,镍沉积层具有纳米晶微观结构,平均晶粒尺寸约为50nm;纳米Al2O3颗粒在沉积层中的含量可达12.2at%;随Al2O3含量的提高,镀层显微硬度逐渐提高,结合强度和耐腐蚀性先提高后有所降低。 相似文献
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Ni-α-Al2O3纳米复合电镀工艺的优选及镀层的硬度和耐蚀性 总被引:1,自引:0,他引:1
为了提高Ni-Al2O3纳米复合电镀层的硬度和耐蚀性,以正交试验对镀液温度、电流密度、α-Al2O3纳米粒子质量浓度等因素进行了优选,采用扫描电镜、能谱仪、硬度仪及电化学工作站分别研究了镀层的微观形貌、能谱、硬度和耐蚀性。获得了最优工艺条件:镀液温度65℃,阴极电流密度2 A/dm2,Al2O3加入量为10g/L;在此工艺条件下所得Ni-α-Al2O3纳米复合镀层晶粒细小、表面平整、光滑,显微组织致密、均匀,镀层的硬度及耐蚀性比纯镍镀层均有显著提高。 相似文献
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脉冲电沉积RE-Ni-W-B-PTFE-Al2 O3复合镀层性能的研究 总被引:2,自引:0,他引:2
高性能复合镀层具有优良的耐磨、耐蚀性能,能满足工业生产对材料性能的要求.研究了脉冲电沉积RE-Ni-W-B-PTFE-Al2O3复合镀层的成分、形貌及性能.结果表明:脉冲电流及Al2O3固体颗粒能明显提高RE-Ni-W-B-PTFE-Al2O3复合镀层中W和B的含量;与直流电沉积相比,脉冲电沉积RE-Ni-W-B复合镀层的表面裂纹已明显减小,但裂纹仍存在,当Al2O3耐磨颗粒及PTFE减摩微粒嵌入RE-Ni-W-B复合镀层中以后,在SEM 400倍下观察,RE-Ni-W-B-PTFE-Al2O3镀层已不存在裂纹, 而且镀液中Al2O3颗粒含量越多,晶粒就越细;此外,研究表明,镀液中Al2O3颗粒含量增加, RE-Ni-W-B-PTFE-Al2O3复合镀层镀态硬度增加,磨损率降低. 相似文献
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镍 -纳米氧化铝复合电镀液的制备及影响因素研究 总被引:5,自引:0,他引:5
性质均匀稳定的镍/纳米颗粒复合镀液是制备镍/纳米复合镀层的物质和工艺基础.在瓦特镀镍溶液中加入纳米Al2O3粉末,混合液静置10 h后,因颗粒沉淀而产生不同程度的分层,通过比色法研究了分散剂、分散形式、镀液pH值对纳米Al2O3粉末在镀液中均匀稳定分散的影响.结果表明,在镀液中加入适量的聚羧酸铵、柠檬酸三铵或十六烷基三甲基溴化铵分散剂,并通过超声分散,可得到稳定分散10 h以上的复合电镀液.原子力显微镜分析表明,复合镀液中纳米颗粒的平均尺寸为63 nm,略大于其原料颗粒的尺寸(40 nm),大部分的纳米颗粒在复合镀液中能实现高度分散. 相似文献
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《材料科学技术学报》2020,(9)
In this study, three kinds of A380/Al_2O_3 composite coatings were prepared by cold spray(CS) using spherical, irregular and spherical + irregular shaped Al_2O_3 particulates separately mixed in the original A380 alloy powders. The influence of Al_2O_3 particulates' morphology on the microstructural characteristics(i.e.retention of Al_2O_3 content in coatings, coating/matrix interfacial bonding, pore size distribution and morphology etc.) and wear performance of the coatings was investigated by scanning electron microscopy(SEM), X-ray computed tomography(XCT) and 3-D optical profilometry. Results indicated that the spherical Al_2O_3 shows obvious tamping effect during deposition process. As a result, the interface showed a wavy shape while the matrix and particulates were mechanical interlocked with much improved adhesion. In addition, the porosity of the coating was minimized and the pores exhibited curved spherical structure with reduced dimensions. The irregular Al_2O_3 particles predominantly displayed the embedding effect together with fragmentation of Al_2O_3 particulates. Consequently, poor coating/matrix interfacial bonding, high porosity and the formation of angular-shaped pores were resulted in the coating. Dry sliding wear tests results revealed that the wear resistance of the coating is directly related with the retained content of Al_2O_3 in the coating. The coating containing irregular Al_2O_3 particulates displayed superior wear performance with its wear rate one seventh of that of the pure A380 alloy coating. The coating containing both kinds of Al_2O_3 particulates showed mixed characteristics of above two kinds of Al_2O_3 composite coatings. 相似文献
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为提高镀铁层的硬度及耐磨性能,采用氯化物低温镀铁工艺,选择纳米ZrO2作为第二相粒子,以不对称交流-直流电源电镀法制备了Fe-纳米ZrO2复合镀层.研究了不对称交流-直流镀铁工艺对镀层的影响,考察了工艺参数对镀层中ZrO2复合量的影响以及表面活性剂对镀层性能的影响.结果表明,采用不对称交流-直流电镀方法可获得内应力小、光滑致密的复合镀层,有效降低镀层裂纹的产生;通过控制工艺参数可调节镀层中ZrO2纳米粒子的复合量;在镀液中加入阴离子型表面活性剂十二烷基硫酸钠可降低纳米粒子的团聚,获得最佳的镀层综合性能. 相似文献
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Ni-SiC脉冲电镀工艺对SiC共沉积量及镀层耐磨性的影响 总被引:2,自引:0,他引:2
采用脉冲电镀法制备了Ni-SiC复合镀层,考察了镀液中SiC质量浓度、脉冲平均电流密度、镀液pH值对复合镀层中SiC共沉积量及镀层耐磨性能的影响.结果表明:电镀工艺参数的改变影响镀层中SiC的共沉积量以及复合镀层的耐磨性.选择适当的工艺参数,可以制备出SiC共沉积量高、微粒弥散较均匀的耐磨复合镀层.复合镀层的抗磨性能不仅与硬质微粒的共沉积量有关,而且与微粒在镀层中分布的均匀性有很大关系,在共沉积量相同的情况下,微粒的分散性越好,镀层的抗磨损性能就越好. 相似文献
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Electrodeposition and mechanical and corrosion resistance properties of Ni-W/SiC nanocomposite coatings 总被引:1,自引:0,他引:1
Ni-W/SiC nanocomposite coatings with various contents of SiC nano-particulates were prepared by electrodeposition in Ni-W plating bath containing SiC particulates. The influences of the SiC nano-particulates concentration, current density and stirring rate of the plating bath on the composition of the nanocomposite coatings were investigated. The surface morphologies of the Ni-W alloy and Ni-W/SiC nanocomposite coating were observed using a scanning electron microscope (SEM). The morphology of Ni-W/SiC nanocomposite coating is smoother than that of Ni-W alloy coating. The microhardness of composite coatings increases with the increasing content of the SiC nano-particulates in the coatings. The corrosion behavior of Ni-W alloy and Ni-W/SiC nanocomposite coatings was evaluated by the anodic polarization curves in 0.5 mol/L NaCl solution at room temperature. It shows that Ni-W/SiC nanocomposite coating has better corrosion resistance than the Ni-W alloy coating. 相似文献