Ni-P/纳米TiO2复合镀层的制备与性能

采用电泳沉积-化学镀两步法制备了化学镀Ni-P/纳米TiO2复合镀层,研究了电场强度、电流及电泳时间对电泳工艺的影响,确定了合适的化学镀工艺参数,用X射线衍射和扫描电镜对复合镀层的结构进行分析,测试了复合镀层的显微硬度,用甲基橙为模型反应物对复合镀层进行光催化降解实验.实验结果表明,纳米TiO2颗粒在复合镀层中分布均匀,在镀态下和经过热处理后复合镀层显微硬度均高于化学镀镍磷合金,复合镀层催化效果与纳米二氧化钛涂层相当.     

化学复合镀Ni—P—SiC的研究

研究了在Ni-P化学镀液中添加分散剂A及SiC微粒，得到的化学镀Ni-P-SiC复合镀层，并研究了Ni-P-SiC化学共沉积工艺及其镀层性能，结果表明，该复合镀层附着性好，经一定温度热处理后，具有较高的硬度及良好的耐磨性。     

复合刷镀Ni-ZrO2工艺与性能研究

复合刷镀Ni-ZrO2镀层具有优良的高温性能。对Ni-ZrO2复合刷镀工艺中刷镀电压和电流密度，刷镀电压与镀层显微硬度的关系进行了研究。镀层的显微硬度、耐热性等性能进行了测试。对镀液中粒子合量对镀层中粒子合量的影响，以及时效热处理对硬度的影响进行了分析。对复合刷镀的沉积机理和镀后强化机理进行了探讨。     

2738模具钢表面激光熔覆Ni基WC复合涂层的摩擦磨损性能

在2738模具钢表面通过CO2激光熔覆制备Ni基WC复合涂层。分别对2738钢基体和Ni-WC激光熔覆层进行干摩擦试验。用三维表面形貌仪测量磨损体积,用扫描电镜观察磨痕的表面形貌。试验结果表明,Ni-WC复合涂层试样的硬度显著提高,表面硬度超过1200HV,保证了Ni-WC熔覆层的耐磨性。熔覆层的平均摩擦因数约为0.24,与2738钢基体的摩擦因数0.43相比,降低了约44%。熔覆试样的比磨损率比基体试样的比磨损率下降了96.7%,WC硬质相提高了摩擦副表面的承载能力。磨粒磨损为Ni-WC复合涂层的主要磨损机理。     

纳米粒子对复合化学镀镍层性能的影响

在化学镀镍溶液中添加银纳米粒子,在钢铁基体上制备Ni-P/Ag纳米复合镀层.研究了添加银纳米粒子前后镀液的镀速、镀层的厚度、镀态和热处理态的硬度变化,分析了银纳米粒子对镀层性能的影响.研究结果表明,银纳米粒子使得镀层的沉积速率加快,厚度增加,硬度提高.镀层的表面形貌也由于银纳米粒子的存在而发生了改变.     

超声波辅助电镀沉积Ni镀膜工艺研究

采用超声波辅助电镀沉积工艺方法研究工艺参数对电镀沉积金属镍镀膜的表面形貌及力学性能的影响规律.实验结果表明:超声波辅助电镀沉积镍镀层时,超声波能够细化镀层的晶粒,降低镀层的孔隙率,同时显著地改善异性工件电镀层的均匀性.当超声波作用时间20 min时,电镀镍镀层的孔隙率为2个/cm2.随着超声波作用时间的延长,电镀镍镀层的显微硬度呈现出先增加后降低的变化趋势.     

Ni—P—PTFE复合化学沉积的研究

研究了PTFE添加量及热处理温度和镀层性能的影响，研究结果表明：使用阳离子与非离子混合表面活性剂对PTFE微粒进行预处理，可提高PTFE在镀液中的润湿和分散能力，使之较易与镍离子一起共沉积;坳高温热处理后的复合镀层的硬度及耐磨性有明显提高，且其耐磨性性优于一般Ni-P镀层。X射线衍射实验结果证明：镀层硬度的提高是热处理使 合镀层晶化所致。     

压缩空气搅拌对电镀光亮镍过程影响的研究

研究了压缩空气对电镀光亮镍的沉积速度及电极电流效率的影响，同时对不同搅拌条件下得到的镀层硬度、孔隙率及结构进行了测定．结果表明，搅拌这一工艺参数对电镀过程有较大的影响．     

纳米粒子对复合化学镀镍层性能的影响

在化学镀镍溶液中添加银纳米粒子,在钢铁基体上制备Ni-P／Ag纳米复合镀层。研究了添加银纳米粒子前后镀液的镀速、镀层的厚度、镀态和热处理态的硬度变化,分析了银纳米粒子对镀层性能的影响。研究结果表明,银纳米粒子使得镀层的沉积速率加快,厚度增加,硬度提高。镀层的表面形貌也由于银纳米粒子的存在而发生了改变。     

Ni-ZrO2纳米复合镀层研究进展

综述了Ni-ZrO2纳米复合镀层的研究现状,重点阐述镀层的沉积机理.从镀层的组织结构出发,探讨其特殊的硬度、耐磨性、抗疲劳性、抗高温氧化性及耐蚀性,以及影响镀层沉积的主要工艺参数,分析了Ni-ZrO2纳米梯度复合镀层.分析认为,Ni-ZrO2纳米复合镀层的研究尚存在较大的发展空间,应进一步优化镀层的综合性能,拓展其在工程领域中的应用.     

High temperature behaviors of high velocity arc sprayed Fe-Al/Cr3C2 composite coatings

Fe-Al/Cr3C2 composite coatings were manufactured using high velocity arc spraying （HVAS） technology. The high temperature erosion, wear and corrosion resistance of the coatings were investigated. The coating properties such as bonding strength, porosity, hardness as well as microstructures were characterized. The results show that the coatings have relatively high heat tremble bond strength, hardness, and typical layer-shaped coatings＇ microstructures. With the rise of temperature, the coating erosion resistance increases too; the impingement angel does effects on erosion properties, and the erosion mechanism changes from ductile to brittle behaviors at 450℃. The coatings have good room temperature wear resistance and relatively good high temperature resistance. The wear mechanism of the coatings is peeling wear behavior. The coatings have excellent high temperature corrosion resistance because of the produce of oxides during corrosion.     

陶瓷/金属复合耐磨涂层的性能评价

应用大气等离子喷涂（APS）技术制备陶瓷／金属复合耐磨涂层试样，并对其硬度，结合强度，微观结构和耐磨性等性能进行评估，结果表明Al2O3-TiO复合涂层在耐磨性方面好于WC－NiCrAl复合涂层，而WC－NiCrAl复合涂层在结合强度性能上好于Al2O3-TiO2复合涂层。     

纳米WC/12Co涂层在轴流式引风机叶片防磨上的研究

采用超音速火焰喷涂工艺分别制备了纳米结构和微米结构的WC/12Co涂层.通过和传统轴流式引风机叶片抗冲蚀涂层的比较,研究分析了两种涂层的显微硬度、金相结构、结合强度和抗冲蚀磨损性能.结果表明:超音速火焰喷涂WC/12Co涂层性能优于传统抗冲蚀涂层,其中纳米结构涂层性能更加优越.     

Wear Properties of Plasma Transferred Arc Fe-based Coatings Reinforced by Spherical WC Particles

Fe-based coatings reinforced by spherical WC particles were produced on the 304 stainless steel by plasma transferred arc(PTA) to enhance the surface wear properties. Three different Fe/WC composite powder mixtures containing 0 wt%, 30 wt%, and 60 wt% of WC were investigated. The microstructure and phase composition of the Fe/WC composite PTA coatings were evaluated systemically by using scanning electron microscope(SEM) and X-ray diffraction(XRD). The wear properties of the three fabricated PTA coatings were investigated on a BRUKER UMT TriboLab. The morphologies of the worn tracks and wear debris were characterized by using SEM and 3 D non-contract profiler. The experimental results reveal that the microhardness on the cross-section and the wear resistance of the fabricated coatings increase dramatically with the increasing adding WC contents. The coating containing 60 wt% of WC possesses excellent wear resistance validated by the lower coefficients of friction(COF), narrower and shallower wear tracks and smaller wear rate. In the pure Fe-based coating, the main wear mechanism is the combination of adhesion and oxidative wear. Adhesive and two-body abrasive wear are predominated in the coating containing 30 wt% of WC, whereas threebody abrasion wear mechanism is predominated in the coating containing 60 wt% of WC.     

Oxidation performance of Fe-Al/WC composite coatings produced by high velocity arc spraying

Fe-Al intermetallics with remarkable high-temperature intensity and excellent erosion, high-temperature oxidation and sulfuration resistance are potential low cost high-temperature structural materials. But the room tem perature brittleness induces shape difficult and limits its industrial application. The Fe-Al intermetallic coatings were prepared by high velocity arc spraying technology with cored wire on 20G steel, which will not only obviate the problems faced in fabrication of these alloys into useful shapes, but also allow the effective use of their outstanding high-temperature performance. The Fe-Al/WC intermetallic composite coatings were prepared by high velocity arc spraying technology on 20G steel and the oxidation performance of Fe-Al/WC composite coatings was studied by means of thermogrativmetic analyzer at 450, 650 and 800 ℃. The results demonstrate that the kinetics curve of oxidation at three temperatures approximately follows the logarithmic law. The composition of the oxidized coating is mainly composed of Al2 O3, Fe2 O3, Fe3 O4 and FeO. These phases distribute unevenly. The protective Al2 O3 film firstly forms and preserves the coatings from further oxidation.     

TC4基体等离子喷涂WC-Co涂层的工艺研究

采用不同的工艺参数对TC4合金试样进行等离子喷涂WC．Co涂层,对所喷涂的试样进行金相分析和孔隙率测定试验,根据涂层金相照片的氧化物、致密均匀程度以及涂层的孔隙率数值等确定合适的工艺参数．在对此参数下所喷涂的涂层进行结合强度、硬度等性能检验,测得结合强度最低值为38．45MPa,硬度最小值为83,均超过实际要求值．对涂层进行耐磨损比较实验,实验结果表明,此参数下所喷涂的涂层能够很好的满足实际需要．     

Al2O3在等离子喷涂涂层中的应用综述

Al₂O₃作为等离子喷涂的常用材料,以其良好的耐磨性和耐腐蚀性能被广泛地应用于工业领域。本文从原始喂料特征、第二相粉体粒子等方面阐述其对涂层性能的影响,并从梯度涂层、多层涂层和后处理（封孔处理、激光重熔等）等角度,对涂层的孔隙率和耐腐蚀性能的影响作了详细说明,在涂层的韧性方面,主要分析第二相粒子和热处理对涂层韧性的影响,最后对用等离子喷涂技术制备综合性能良好的Al₂O₃基复合涂层的研究方向提出了展望。     

镍、磷和空心微珠复合镀层摩擦磨损性能研究

运用化学镀方法,把空心微珠作为第二相加入化学镀镍和磷镀液中,制得以镍、磷和空心微珠为主的复合镀层.X射线分析显示,复合镀层经过热处理后由非晶态变成晶态.复合镀层经过热处理后显微硬度及摩擦学性能提高.复合镀层耐磨性比纯镍和磷镀层提高约30%,抗腐蚀性提高77%.运用SEM和XPS等对复合镀层性能和结构进行分析.     

Morphology and tribological properties of Ni/n-SiO_2 composite coatings by pulse-reverse current brush-plating

1INTRODUCTION Pulse reversecurrent(RC)platingisanew technologycomingwithpulsecurrent(PC)andre versecurrent.Onthisaspect,earlierstudiesmani festedthat[16],intheconditionofRC,theeffectofelectricdoublelayerwasrestrained,thecontrol ofcrystallinegrowthwasenfor…     

刀具表面涂层技术的研究进展

通过对刀具表面进行涂层处理,可以显著提高刀具的表面硬度和耐磨性,延长刀具的使用寿命.目前刀具涂层制备方法主要包括化学热处理、热喷涂法、溶胶-凝胶法、气相沉积法等.涂层刀具的发展呈现涂层成分多元化、涂层结构多层化、涂层基体梯度化和涂层工艺灵活化的趋势,涂层刀具后处理技术包括热处理、磁化处理及深冷处理等.随着技术的进步,更多更新型的刀具表面涂层技术必将会出现.