钛基二氧化锡纳米涂层的制备与改进

采用热分解法,制备了Ti/SnO2和添加活性元素的Ti/SnO2纳米涂层,并研究了涂层的结构与物化性能。结果表明:普通热分解方法可制备纳米二氧化锡涂层,其晶体结构为金红石结构;热氧化为500℃时,往Ti/SnO2涂层中添加Ru、Co能显著提高Ti/SnO2涂层的电催化性能,而添加La则无作用;制备的Ti/SnRuCo涂层,具有结合强度高、电催化性能好和孔隙率小的特点。     

氧化时间对钛合金微弧氧化膜层的影响

为增强钛合金的生物活性,选用磷酸盐为电解液的主配方,对钛合金进行微弧氧化表面处理,研究氧化时间对微弧氧化膜层的影响,其中包括氧化过程中电解液中钛离子浓度的变化,并借助XRD,SEM等手段对膜层进行物相及表面形貌的分析。结果表明:在微弧氧化过程中,钛合金基体中的钛离子溶解到电解液中;随着氧化时间的增加,电解液中的钛离子浓度也随之增加,氧化膜层为金红石和锐钛矿的混合晶相;但随着氧化时间的增加,氧化膜层中的金红石型晶相逐渐减少直至消失,表面形貌出现孔径不均匀,粗糙度变大等现象。     

电参数对TC4钛合金微弧氧化陶瓷膜的影响

以恒压模式在Na2CO3-Na2SiO3的电解液中对TC4钛合金进行微弧氧化,研究微弧氧化电参数:正向电压、脉宽、脉间对陶瓷膜表面形貌、厚度、粗糙度的影响。结果表明:电压恒定时增加脉宽和脉间有利于提高陶瓷膜的致密性;降低正向电压,降低脉宽,增加脉间有利于得到较薄的钛合金微弧氧化陶瓷膜;降低正向电压,降低脉宽,增加脉间有利于钛合金微弧氧化陶瓷膜的粗糙度减小.     

Microstructure and Properties of Graphene Oxide-doped TiO_2 Coating on Titanium by Micro Arc Oxidation

Micro arc oxidation(MAO) coatings doped with graphene oxide(GO) were prepared on pure titanium by adding GO and sodium dodecyl benzene sulfonate(SDBS) into a sodium silicate solution. The as-deposited coatings were comparatively analyzed by scanning electron microscopy(SEM), energydispersive X-ray spectroscopy(EDS) and X-ray diffraction(XRD). The binding forces of the MAO, MAO+GO and MAO+GO+SDBS three coatings were measured by a scratch tester. The mechanical property of the three coatings was analyzed using the nano-indentation technique. The corrosion resistance of the coatings was tested by the electrochemical system in 3.5% NaCl solution. The photocatalytic activity of the prepared samples was evaluated by determining the degradation of methylene blue(MB) solution. The results showed that compared to the MAO coating, the morphologies and phase compositions of MAO+GO and MAO+GO+SDBS composite coatings were significantly different. These two composite coatings all had superior photocatalytic activity. Especially, the MAO+GO composite coating still had enhanced binding force and excellent corrosion resistance. Furthermore, the relationship between the microstructure and the properties of these three MAO coatings was analyzed.     

Friction and Wear Behaviors of Ti/Cu/N Coatings on Titanium Alloy Surface by DC Magnetron Sputtering

Ti/Cu/N coatings with different Cu contents were deposited on titanium alloy surface by the DC magnetron sputtering technique.XPS and FESEM were employed to characterize the composition and structure of the coating on the Ti6A14 V substrates.In addition,The adhesion force,friction,and wear properties of the Ti/Cu/N coatings were investigated.The experimental results showed that the coarse particles of the coatings would grow more and the surface roughness increased with the increase of copper content in the coatings;The coatings showed a strong adhesion force;The friction coefficient of the coating of the samples was less than the substrate,reaching 0.19 at least.The wear resistance of the coatings could be improved by optimizing and controlling the relative content of Ti,Cu,N elements on the titanium alloy surface,especially the 10.98 at%contents of the copper.The sample C2 kept the best wear resistance.     

Bacteria adherence properties of nitrogen-doped TiO2 coatings by plasma surface alloying technique

In order to obtain a high-performance surface on 316L stainless steel (S. S) that can meet the requirements in medical material field environment, nitrogen-doped titanium dioxide (TiO2-xNx) was synthesized by oxidative annealing the resulted TiNx coatings in air. Titanium nitride coatings on 316L S. S were obtained by plasma surface alloying technique. The as-prepared coatings were characterized by X-ray diffraction, glow discharge optical emission spectrometer (GDOES), scanning electron microscopy and X-ray photoelectron spectroscopy, respectively. The bacteria adherence property of the TiO2-xNx coatings on S. S on the oral bacteria Streptococcus Mutans was investigated and compared with that of S. S by fluorescence microscopy. The mechanism of the bacteria adherence was discussed. The results show that the TiO2-xNx coatings are composed of anatase crystalline structure. SEM measurement indicates a rough surface morphology with three-dimensional homogenous protuberances after annealing treatment. Because of the photocatalysis and positive adhesion free energy, the TiO2-xNx coatings inhibit the bacteria adherence.     

Preparation and Performance of Corona-proof Conductive Composite Coatings

Because of its merits,acrylic resin was chosen to improve the mechanical,conductive and hydrophobic properties.Carbon fiber powders (CF),carbon nanotubes (MWCNT),and nano-TiO_2 were incorporated into the acrylic resin to prepare the corona-proof conductive composite coatings.The incorporation of CF and MWCNT may improve the conductivity and mechanical strength of the coatings.However,the addition of nano-TiO_2 may increase the hydrophobicity of the coatings.Thus,the effects of different additives on the mechanical properties,conductivity,hydrophobicity and heat resistance of the conductive film were studied.The experimental results show that the incorporation of carbon fiber powders and multi walled carbon nanotubes can significantly improve both the conductivity and mechanical properties of the conductive coatings,and the addition of nano titanium dioxide can improve the hydrophobicity of the conductive film.     

The Influence of Type and Thickness of Sol-gel Derived Coatings on the in vitro Osteoblasts Behavior

1Introduction Numerousmethodswereexploredtoimprovethebio activity(osteoconductivityandosteoinductivity)oftitani umimplants.Amongthem,sol gelprocesshasbeenahot topicbecauseofitshigherchemicalhomogeneity,finer grainstructure(nanometerscale),lowerprocessingtem perature,easierandcontrollableprocedure.Andthe thicknessofthecoatingcouldbeeasilycontrolledby changingthetimesofcoating[1].3kindsofSol gelde rivedcoatingsareintensivelystudiedinrecentyears.Hydroxyapatite[HA,Ca10(PO4)6(OH)2]haslongbeen r…     

Effects of electroplated coatings on corrosion behavior of Ti-1023/30CrMnSiA galvanic couple

Galvanic corrosion behavior of Ti-1023 titanium alloy coupled 30CrMnSiA steel was investigated in 3.5% NaCl solution. Particular attention was given to the effect of three different electroplated coatings on corrosion behavior of the galvanic couple. Galvanic corrosion test was conducted on Ti-1023 titanium alloy which coupled Ni-electroplated 30CrMnSiA, Zn-electroplated 30CrMnSiA, Cd-electroplated 30CrMnSiA and bare 30CrMnSiA, respectively. Corrosion properties including open circuit potential （Eoc）, galvanic corrosion potential （Eg）, and galvanic corrosion current （lg） were monitored. Corrosion morphology was observed by optical microscope （OM） and corrosion mechanism was analyzed and discussed. The results show that the three electroplated coatings improve the corrosion resistance of the anode in different magnitudes. Ni-electroplated 30CrMnSiA and Cd-electroplated 30CrMnSiA coatings are found to be least susceptible to galvanic corrosion when coupled Ti-1023 titanium alloy. Zn-electroplated 30CrMnSiA is moderately susceptible to galvanic corrosion. But the bare 30CrMnSiA is highly susceptible to galvanic corrosion in corrosive environment.     

功能颜填料对水性纳米建筑涂料隔热性能的影响

采用不同功能颜填料制备水性纳米建筑隔热涂料,以水性聚氨酯为成膜剂,以滑石粉、绢云母为填料,再以纳米金红石型二氧化钛和空心陶瓷微珠分别作为隔热功能颜填料,制备水性纳米建筑隔热涂料,研究功能颜填料对涂料隔热性能的影响。实验结果表明:绢云母具有较高的辐射隔热效果,空心微珠、纳米金红石型二氧化钛为高反射隔热填料;其中绢云母最佳用量(质量分数)为10%,当绢云母与空心玻璃微珠混合时,空心玻璃微珠最佳用量(质量分数)为5%;当绢云母与纳米金红石型二氧化钛混合时,纳米金红石型二氧化钛最佳用量(质量分数)为6%。纳米金红石型二氧化钛比空心玻璃微珠作为填料时隔热性能稍优,最优隔热率达到94%以上。从经济效益角度,建议用空心玻璃微珠作为填料制备聚氨酯涂料。     

电压对纯钛微弧氧化膜生长特性的影响

在Na2CO3Na2SiO3溶液中,利用单极性脉冲微弧氧化电源在TA2基底上制备了二氧化钛氧化膜.研究了微弧氧化电压对氧化膜生长速率、相组成及表面形貌的影响.结果表明:随着电压的升高,氧化膜的生长速率先增加后减小,表面粗糙度和微孔尺寸逐渐增大,而微孔密度逐渐减小.膜层主要由锐钛矿和金红石相TiO2组成,随着电压的增加,膜层中锐钛矿相TiO2先增加后减少,而金红石相TiO2则逐渐增加并成为主晶相.     

Ti6Al4V钛合金微弧氧化工艺研究

采用直流稳压电源,选用3种不同PH值的碱性微弧氧化电解液,在Ti6Al4V钛合金表面制备微弧氧化膜层;应用扫描电子显微镜分析微弧氧化膜层形貌特征。结果表明,钛合金微弧氧化膜层表面凹凸不平,带有微米级和亚微米级的孔洞,孔洞周围呈现火山丘状形貌特征;微弧氧化电解液PH值越大,火花放电时间越长;在给定电压条件下,电解液PH值越大,微弧氧化膜层厚度越大。     

印钞废水制备水性内墙涂料

以印钞擦板废水为原料,加入成膜物质（苯丙乳液和硅溶胶）与颜填料（钛白粉、高岭土、碳酸钙、滑石粉）制备低成本水性内墙涂料;考察了硅溶胶用量、废水用量、颜料用量对涂料性能的影响,制备出符合国家标准的水性内墙涂料。与同类产品相比较,硬度更好,且降低了涂料的成本及处理印钞废水所需要的高昂费用,避免了焚烧废油墨渣的二次污染。其基本配方（质量分数）为：苯丙乳液18%,硅溶胶12%,印钞废水30%,钛白粉15%,填料21.6%,SD-505成膜助剂2%,DA-208消泡剂0.3%,5040分散剂0.2%,SD-200水性润湿剂0.1%,防冻剂0.5%,TT-935流平增稠剂0.3%。     

不同电源模式对电沉积磷酸钙涂层的影响

采用电化学沉积的方法在钛合金（Ti-6Al-4V）表面制备生物涂层．通过采用恒电流模式和脉冲电源模式考察不同的电源模式对电沉积磷酸钙涂层的影响．试验研究了不同电源模式对涂层的微观形貌及涂层厚度的影响．结果表明：脉冲电流下制备的涂层比恒电流条件下制备的涂层更为均匀致密．在同等的沉积条件下。脉冲电流制备的涂层厚度比恒电流条件制备的涂层厚度增加了16．2μm．XPD分析表明,电源模式的改变并没有影响磷酸钙的生成．     

Damage Mechanism of Al2O3 Ceramic Coatings Irradiated by CO2 CW Laser

Rules and mechanism of damage in Al2O3 coatings irradiated by CO2 CW laser are studied in order to improve the ability of parts of equipment standing against the high power laser.Al2O3 coatings were sprayed by air plasma spray(APS)on the 45# steel substrate,and then were irradiated by CO2 CW laser from 795 W/cm2 to 31 830 W/cm2.As the output power of the laser is increasing,its porosity is increasing and cracks are appearing and spreading quickly.And also the phase will transform from γ-Al2O3 to α-Al2O3 in the damaged areas.When the energy density is 17 507 W/cm2,the coatings are destroyed completely.The thermal infection field on substrate is rather small.The laser energy is depleted by the phase transformation and cracks in Al2O3 coatings during the laser thermal shock.     

等离子喷涂复合陶瓷涂层及其耐磨性能

用等离子喷涂技术制取了ＭＯ＋Ａｌ２Ｏ３－ＴｉＯ２、ＭＯＳ２＋Ａｌ２Ｏ３、ＴｉＯ２＋Ｃｒ３Ｃ２ＮｉＣｒ和ＭｏＳ２＋Ｃｒ３Ｃ２－ＮｉＣｒ复合涂层．利用ＳＥＭ、ＸＲＤ、和ＸＰＳ等技术．观察和分析了涂层的显微结构和喷涂过程中的物相变化及添加成分对涂层耐磨性能的影响．在ＭＭ－２００型磨损试验机上测定了涂层的滑动摩擦系数和磨损率．结果表明；Ｍｏ、ＭｏＳ２与Ａｌ２Ｏ３－ＴｉＯ２的结合性能较好，ＴｉＯ２、ＭｏＳ２在Ｃｒ３Ｃ２－ＮｉＣｒ涂层的气孔和裂纹处偏聚；添加ＭｏＳ２对Ａｌ２Ｏ３－ＴｉＯ２涂层的物相组成有明显的影响；适量的ＭＯ、ＭＯＳ２加入Ａｌ２Ｏ３－ＴｉＯ２中，可以降低涂层的摩擦系数和磨损率；而ＴｉＯ２、ＭｏＳ２加入Ｃｒ３Ｃ２－ＮｉＣｒ中，对涂层的摩擦磨损性能影响不大     

碳钢Cr-Ti共渗及Al-Ti共渗层的组织和性能

为了提高碳钢构件的硬度、耐磨性和耐蚀性，对35钢及20钢实施Cr—Ti共渗及Al-Ti共渗，用X射线、EPMA、显微硬度及摩擦磨损实验等分析测试方法，研究了渗层的组织和性能．结果表明，35钢Cr—Ti共渗层外侧富Cr、内侧富Ti，在3．5％NaCl和10％H2SO4溶液中有良好的耐蚀性；渗层表面硬度HV0.2=1900，耐磨性比17Cr2Ni2Mo渗碳钢对比试样提高3倍．35钢Al—Ti共渗层外侧富Ti、内侧富Al，在10%H2SO4溶液中的耐蚀性较差；渗层表面硬度为HV0.2=400，但耐磨性仍比对比试样提高近一倍。     

Ultraviolet shielding property of crylic acid resin filled with nano-SiO_2

1INTRODUCTION Thefewultravioletradiationinsunlight(wavelengthbetween290and400nm,about5%)hadgreatdamagetopolymerandcauseditschemi calbondbreakdownanditsaginganddegradationthroughautomaticoxidationreaction.Acrylicacid resin,asoneofhigh speeddevelopmentandne…     

Influence of oxides on high velocity arc sprayed Fe-Al/Cr_3C_2 composite coatings

1INTRODUCTION Arcspraying(AS)isatechniquethatthemet alisheatedtodropletsbyanelectricarcandthensprayedontosubstratesbythecompressedair. Highvelocityarcspraying(HVAS)technologyisdevelopedonthebasisofAS.Aspecialtubede signedaccordingtotheprincipleofaerodynamicsis mountedattheexitofcompressedair.Theveloci tyanddistributionofmelteddropletsbecomehigh erandmoreuniform,respectively.Asaresult,acoatingwithlowporosity(2%)andhighdensity andbondstrengthcanbeobtained[15].Fe Alin termetalliccompound…     

Surface characteristics of mussel-inspired polydopamine coating on titanium substrates

Mussel adhesive proteins are non-toxic, biodegradable and have low immunogenic qualities that make them highly attractive for medical purposes compared with man-made materials. 3,4-DOPA, which is a dopamine precursor, is a critical element for achieving mussel-like adhesive properties. In present study, polydopamine was coated onto the titanium surfaces by dipping in a 2 mg/mL dopamine solution in 10 mM Tris- HCl buffer at pH 8.5. EDX element analysis and Raman spectroscopic analysis of the surface were conducted to verify the formation of polydopamine. The surface characteristics of polydopamine-coated titanium plates were observed by SEM and AFM. Hydrophilicity and corrosion-resistance were also evaluated by static contact angle measurements and potentiodynamic polarization corrosion tests. The absorption intensity for pH-induced polymerization rapidly increased for the initial four hours and thereafter smoothly increased. EDX element analyses revealed that the content of carbon and oxygen increased and the content of titanium decreased after the coating process. In the Raman spectra, polydopamine resulted in two new peaks at approximately 1 370 and 1 570 cm^-1 resulting from the stretching and deformation of catechol. Microstructural features revealed that nanometer-sized bright granules were randomly distributed after coating, and these nanoparticles grew with increased coating time. The Ra values of polydopamine-coated titanium plates were showed to increase with coating time. Compared to the pure titanium curve, the inflection point of polydopamine-coated titanium was located at a higher corrosion potential and lower corrosion current density. Findings from our research suggested that polydopamine coatings offer a versatile approach for titanium surface modification.