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Ni-P/MoS_2自润滑化学复合镀层的制备及性能研究 总被引:3,自引:1,他引:2
在化学镀Ni-P合金镀液中添加自润滑复合颗粒MoS2,制备以45#钢为基体的Ni-P-MoS2化学复合镀层,并研究MoS2固体微粒的镀前预处理技术和化学复合镀层的制备工艺。通过金相显微镜、X射线衍射仪分析复合镀层的表面形貌、结构,在球盘试验机上研究MoS2的添加量对镀层耐磨及减摩性能的影响,并测试复合镀层的耐腐蚀性能。结果表明,制备的Ni-P-MoS2复合镀层为非晶态结构,结合力紧密并具有优异的自润滑性能;MoS2的加入可以显著提高Ni-P/MoS2合金镀层的耐磨、耐蚀及减摩性能。 相似文献
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刀具的抗磨和减摩镀层 总被引:13,自引:0,他引:13
对刀具镀层发展过程的回顾表明,以提高硬度为目标的耐磨镀层已经逐步向具有自润滑功能的耐磨减摩镀层方向发展。结合我们自己的工作,给出了硫化钼、碳膜等镀层的摩擦学性能的研究结果。 相似文献
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金刚石微粉性能是提升金刚石线锯性能的关键因素。用化学镀方法在线锯用金刚石微粉表面镀镍,通过正交试验研究金刚石粒度、次亚磷酸钠浓度、镀液pH值和镀液温度对化学镀镀层沉积速率、镀层密度、镀层耐腐蚀性能、镀层致密度等性能的影响。结果表明:M1/2、M6/12、M20/30三种不同粒度金刚石微粉,在次亚磷酸钠浓度为25~35g/L、化学镀液pH值为3~11、化学镀温度为30℃~90℃时,针对镀层沉积速率、镀层密度和镀层耐腐蚀性的最佳工艺参数不同;不同粒度的金刚石微粉在相同工艺条件下化学镀镍,金刚石微粉粒度越大,镀层越均匀致密;金刚石微粉化学镀镍各工艺参数之间相互作用,共同影响镀层性能。对于不同粒度的金刚石微粉,各因素对镀层性能的影响权重不同,因此针对不同粒度、不同镀层性能需求的金刚石微粉应采取不同的镀覆工艺参数。 相似文献
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采用纳米复合电镀技术,通过向Ni/α-Al2O3纳米复合镀溶液中添加CeO2方法在45#钢上制备了Ni/α-Al2O3-CeO2纳米复合镀层;研究了CeO2对镀层微观组织、显微硬度及摩擦学性能的影响;用分析型扫描电镜、显微硬度计及摩擦磨损试验机对复合镀层组成、微观组织、显微硬度及摩擦学性能进行了分析。结果表明,适量CeO2的加入促进了纳米α-Al2O3的沉积量,使纳米α-Al2O3在镀层中的分布更加均匀,添加过多的CeO2对纳米α-Al2O3分布不利;CeO2添加量为40g/L时,平均显微硬度比未添加CeO2的提高近30%,磨痕宽度减少近40%;CeO2能改善复合镀层的耐磨性能,有效防止镀层片状脱落。 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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A. V. Krokhalev O. A. Avdeyuk K. V. Prikhod’kov A. N. Savkin S. V. Kuz’min V. I. Lysak 《Russian Engineering Research》2014,34(2):85-88
Attention focuses on the application of powder coatings and the shaping of hard alloys from powder mixtures (chromium carbide + metals) in explosive machining. The loading conditions are investigated as a function of the properties of the metal binder, as well as its structure, hardness, and antifrictional behavior. 相似文献
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为增强材料表面硬度和耐磨性,以Ti O2-Al-B4C-C作为粉末体系,利用激光熔覆技术在45#钢基材表面上制备了Ti C-Ti B2增强复合涂层,采用金相显微镜、扫描电镜(SEM)、X射线衍射仪(XRD)、显微硬度计和摩擦磨损试验机研究了不同含量的Ti O2-Al-B4C-C系合金粉末对涂层组织性能的影响。结果表明:复合涂层与基材冶金结合,无裂纹和气孔等缺陷,Ti C、Ti B2弥散分布于涂层中;随着Ti O2-Al-B4C-C系合金粉末含量的增加,涂层组织中Ti C、Ti B2及等轴晶的量逐渐增多;熔覆层的硬度也逐渐增加,当合金粉末含量为70Wt%时,熔覆层硬度最高,为基材的4倍。Ti O2-Al-B4C-C系合金粉末含量为50Wt%时,熔覆层磨损量最小,耐磨性最好 相似文献
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化学复合镀(Ni-P-MoS_2)缝纫机导杆的摩擦磨损性能研究 总被引:1,自引:0,他引:1
以缝纫机导杆的减摩需求为背景,以曲面-曲面接触方式,在5 mm振幅下,以不锈钢为基体,研究Ni-P镀层、外加MoS2的Ni-P镀层及Ni-P-MoS2复合镀层的往复滑动摩擦学行为,研究载荷、频率以及MoS2对摩擦因数和磨损率的影响。研究结果表明,镀层摩擦因数均随着滑行频率和载荷的的增加呈不同的变化趋势,Ni-P镀层的摩擦因数最大,外加MoS2的Ni-P镀层次之,Ni-P-MoS2复合镀层最小;其磨损率均随着滑行频率和载荷的增加而增加,Ni-P-MoS2复合镀层的磨损率较外加MoS2的Ni-P镀层与Ni-P镀层的小,这是由于MoS2的低摩擦性并在化学复合镀后具有较好的结合力,从而使Ni-P-MoS2复合镀层具有较好的耐磨性和自润滑性。 相似文献
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表面修饰的纳米金刚石微粒在润滑油中的抗磨减摩性 总被引:1,自引:0,他引:1
将纳米铁微粒、纳米铜微粒及纳米金刚石微粒分别分散到不含油性剂和极压抗磨添加剂的半成品合成润滑油中,采用MM-200型磨损实验机和XL30-1扫描电镜等设备研究了纳米微粒的抗磨减摩性,采用发动机台架试验研究了纳米金刚石的摩擦性能.结果表明,纳米金刚石微粒可明显改善润滑油的抗磨减摩性能;纳米金刚石润滑油的油膜有着非常好的抗黏滑能力和承载能力,对摩擦副有自修复作用.在普通发动机润滑油中加入质量分数0.01%的纳米金刚石微粒后,其润滑性能有很大的改善,在相同转速下功率平均提高4.2%;怠速时的HC排放量从8.75×10-4降低到3.50 ×10-4,降低60%,Nox排放量从1.66×10-4降低到1.32×10-4,降低20.5%;油缸的压力从0.441 Mpa增加到0.568MPa,相对增加28.9%;怠速也提高了19.6%. 相似文献
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用JW—702型多试样磨损试验机研究了以铸铁(HB220)为摩擦副在干摩擦和油润滑条件下PTFE含量对Ni-P-PTFE化学复合镀层耐磨性的影响。结果表明,随着PTFE含量的增加,镀层的硬度下降,摩擦系数先降后升,耐磨性基本上随着硬度的下降呈线性降低。摩擦系数对耐磨性有影响,但不显著。 相似文献
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化学复合镀制备Ni-Co-P-PTFE自润滑镀层的工艺研究 总被引:1,自引:0,他引:1
对Ni-Co-P-PTFE化学复合镀制备自润滑镀层的工艺过程进行了研究。探讨了实验因素对镀层的摩擦因数和显微硬度的影响情况,得到的最佳工艺条件是电镀时间2h,镀液温度90℃,pH值5,PTFE乳液加入量10g/L,镀液中CoSO4与NiSO4的摩尔配比为1:1。实验表明,该复合镀层具有优异的润滑性能。 相似文献
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《Wear》2006,260(1-2):25-29
Using a gas tungsten arc welding (GTAW) process, in situ synthesis TiC particles reinforced Fe-based alloy composite coating has been produced by preplaced FeCrBSi alloy, graphite and ferrotitanium powders. The microstructure and wear properties of the composite coatings were studied by means of scanning electron microscopy (SEM), X-ray diffractometer (XRD) and wear test. The effects of thickness of the pre-placed powder layer on the microstructure, hardness and wear resistance of the composite coatings were also investigated. The results indicated that TiC particles were produced by direct metallurgical reaction between ferrotitanium and graphite during the GTAW process. TiC particles with sizes in the range of 3–5 μm were dispersed in the matrix. The volume fraction of TiC particles and microhardness gradually increased from the bottom to the top of the composite coatings. The TiC-reinforced composite coatings enhance the hardness and wear resistance. The highest wear resistance of the composite coating with a 1.2 mm layer was obtained. 相似文献
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N. P. Aleshin N. V. Kobernik R. S. Mikheev V. E. Vaganov V. V. Reshetnyak A. V. Aborkin 《Russian Engineering Research》2016,36(1):46-52
Modification of Babbitt coatings by carbon nanotubes in plasma–powder application is considered. A model is proposed for the interaction of a graphene-like surface and atoms from the Babbitt alloy. The influence of carbon nanotubes obtained by different means on the performance of antifrictional coatings is studied. 相似文献
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《Wear》2006,260(7-8):705-710
Using a gas tungsten arc welding (GTAW) process, in situ synthesis TiC particles reinforced Fe-based alloy composite coating has been produced by pre-coated FeCrBSi alloy, graphite and ferrotitanium powders on the substrate. The microstructure and wear properties of the composite coatings were studied by means of scanning electron microscopy (SEM), X-ray diffractometer (XRD) and wear test. The effects of thickness of the pre-coated powder layer on the microstructure, hardness and wear resistance of the composite coatings were also investigated. The results indicated that TiC particles were produced by direct metallurgical reaction between ferrotitanium and graphite during the GTAW process. TiC particles with sizes in the range of 3–5 μm were dispersed in the matrix. The volume fraction of TiC particles and microhardness gradually increased from the bottom to the top of the composite coatings. The TiC-reinforced composite coatings enhance the hardness and wear resistance. The highest wear resistance of the composite coating with a 1.2 mm layer was obtained. 相似文献