高速火焰电弧复合喷涂枪制备3Cr13涂层的性能

高速火焰电弧(HVAF-ARC)复合喷涂枪是高速火焰喷涂枪和电弧喷涂枪的结合体,利用产生的高速燃气来雾化加速电弧喷涂过程中产生的熔融粒子,提高了喷涂粒子的飞行速度,降低了粒子的氧化,可高效制备优质的涂层。文中利用自主开发的新型高速火焰电弧复合喷涂枪和普通高速电弧喷涂枪,分别在钢基体上制备了3Cr13涂层,通过对涂层的性能检测发现,复合喷涂枪所制备涂层的氧元素含量和孔隙率都比普通高速电弧喷涂枪制备的涂层低,分别降低了33%和49%,硬度提高了12%,复合喷涂枪制备涂层的性能得到较大的提高。     

高速电弧喷涂铝涂层性能试验研究

本文对高速电弧喷涂铝涂层和普通电弧喷涂铝涂层进行了对比试验研究。结果表明：高速电弧喷涂粒子束更加集中,粒子的飞行速度显著提高,粒子的雾化效果明显改善。高速电弧喷滁铝涂层具有结合强度高、硬度高、孔隙率低、组织致密等特点。     

高速电弧喷涂涂层的性能

分析了高速电弧涂层的结合强度、涂层显微硬度以及涂层孔隙率，并与普通电弧喷涂涂层对比，证明喷涂粒子飞行速度的提高，极大提高了涂层性能。     

大功率高速电弧喷涂层性能及其应用

采用新型大功率高速电弧喷涂系统,对比高速与普通喷涂枪的粒子雾化效果,分析了雾化粒子初速度对涂层结构的影响,对比了涂层表面粗糙度、孔隙率以及结合强度的差异。概述了近3年来大功率高速电弧喷涂系统的最新应用实例。     

金属喷涂、堆焊与修复

金属喷涂工艺与设备 冷喷涂Au纳米粒子在金属表面沉积过程的分子动力学模拟；降低热喷涂涂层孔隙率的方法；电弧喷涂铝基涂层耐腐蚀性能；电弧喷涂技术在转炉烟罩水冷壁防护上的应用；制备低孔隙超细涂层的高速电弧喷涂枪……     

高速电弧喷涂不锈钢涂层的旋转回归试验研究

对比研究了３Ｃｒ１３不锈钢高速电弧喷涂涂层和普通电弧喷涂层的孔隙率、氧化物含量、涂层结合强度和滑动磨损性能,并采用多因素正交旋转回归设计和单因素对比试验的方法了高速电弧涂工艺参数对３Ｃｒ１３不钢涂层显微硬度的影响,用微机回归得到了喷涂工艺参数与涂层硬度之间的定量关系式。结果表明,和普通电弧喷涂涂层相比,高速电弧喷涂涂层组织致密、孔隙度低、涂层氧化物含量增多,涂层－基体界面结合强度大于４０ＭＰａ,比     

Al及Al-Re高速电弧喷涂层性能的研究

对高速电弧喷涂(HVAS)与普通电弧喷涂铝及铝稀土涂层进行了对比实验研究.结果表明,稀土元素的加入明显改善了涂层与基体的结合性能,降低了铝合金涂层的孔隙率,同时,铝合金涂层的孔隙率也受铝稀土丝材加工工艺的影响;高速电弧喷涂铝稀土材料时,涂层具有结合强度高、硬度高、孔隙率低、组织致密等特点.     

高速电弧喷涂层的组织和性能

对比研究了新型高速电弧喷涂层和普通电弧喷涂层的表面形貌、显微组织和界面合金元素分布,测定了不同工艺条件下喷涂层的硬度、孔隙率和拉伸结合强度,并考察了三种材料电弧喷涂层的磨损性能,探讨了高速电弧喷涂层和普通电弧喷涂层组织、性能差异的原因。     

利用电弧超声改善电弧喷涂质量的研究

提出用电弧超声方法作为改善喷涂涂层质量的新方法。作为电弧喷涂的热源，在对其施加高频调制之后，喷涂电弧可以作为超声波的发射源而作用于喷嘴内的雾化微粒。超声波的空化效应，机械效应和热效应加强了喷涂材料的雾化效果。从能量的角度研究了电弧超声的应用使得喷涂粒子的粒度变小，飞行速度加快，提高了喷涂的生产效率，制备出的涂层强度提高，孔隙率降低的机理。     

等离子喷涂Al2O3陶瓷涂层的工艺研究

采用SprayWatch-2i粒子测速仪测定等离子喷涂时粒子的飞行速度及温度,确定最佳喷涂电流和电压参数,改变送粉方式和送粉速率制备Al2O3涂层.研究所制备涂层的孔隙率、显微硬度、耐磨性及结合强度,研究结果指出：影响Al2O3涂层质量的主要工艺参数为喷涂功率、送粉方式和送粉速率,等离子喷涂10～40μmAl2O3粉末制备Al2O3陶瓷涂层的最佳工艺参数为电流600 A、电压60 V、枪内送粉、送粉速率10.25 g/rmin.     

电弧喷涂Zn-Al伪合金涂层耐腐蚀性能研究进展

通过在钢基体表面制备涂层可以很好地延长钢铁材料的服役时间,减少因腐蚀造成的重大事故和人员伤亡。相较于传统的纯Zn涂层、纯Al涂层以及Zn-Al合金涂层,Zn-Al伪合金涂层能够为基体材料提供长久有效的腐蚀防护,在钢铁材料的腐蚀防护中具有巨大的应用潜力。简述了Zn-Al伪合金涂层电弧喷涂制备工艺的特点;介绍了Zn、Al、Zn-Al合金及Zn-Al伪合金涂层在模拟海洋环境下的腐蚀防护原理;在此基础上从组分、喷涂工艺参数(喷涂距离、喷涂电流和喷涂电压)、元素掺杂(Mg、Si及Re)及后处理工艺(封孔、激光重熔)等角度,论述了其对Zn-Al伪合金涂层耐蚀性的影响;讨论了Zn-Al伪合金涂层防腐体系在桥梁、海洋钢结构件、地下运输管道中的应用现状;最后总结了目前研究工作中存在的挑战,提出了电弧喷涂Zn-Al伪合金涂层尚需深入研究的重点问题,为提高钢铁材料使用寿命提供了参考。     

新型高速电弧喷涂枪的开发研究

详细介绍了开发研制的新型高速电弧喷涂枪：分析测定了新型喷枪和普通喷枪出口的雾化气流速度,同时采用A1和3Cr13作为对比试验材料,对涂层进行性能研究并观察了其组织结构。结果表明：新型喷枪的雾化气流速度的捌试计算值在距枪口80mm的范围内仍然能保持在600m／s左右,比普通喷枪的雾化气流速度有显著地提高：高速电弧喷滁熔融的金属粒子雾化充分,涂层组织致密,层状结构十分明显,并且结合强度值和硬度值均较高：新型高速电弧喷涂枪,结构简单,工作性能稳定。高速电弧喷涂是一种优质、高效、低成本的热喷涂方法。     

基于电化学阻抗谱的Zn及Zn-Al涂层的自封闭机理研究

目前，热喷涂Zn—Al合金涂层已替代Zn及Al涂层，成为海洋环境下钢结构件腐蚀防护的首选方法。使用高速电弧喷涂和粉芯丝材技术制备了Zn—Al涂层，采用电化学阻抗谱法(EIS)，结合涂层腐蚀产物X-射线衍射(XRD)及涂层腐蚀后表面形貌分析，对比研究了Zn及Zn—Al涂层的耐蚀性，并探讨了涂层的自封闭机理。结果表明，活化溶解是Zn涂层腐蚀的主要机制，在腐蚀过程中Zn涂层表现出自封闭作用，但由于腐蚀产物是疏松的，其自封闭效果微弱；Zn—Al涂层表现出了更好的耐蚀性，涂层表现出一定的自封闭效果。     

Effect of particle state on the adhesive strength of HVOF sprayed metallic coating

NiCrBSi and Ni-50Cr coatings were deposited using the high velocity oxygen fuel (HVOF) spray process under different spray parameters with two powders of different sizes to clarify the influence of the melting state of spray particles on the adhesive strength of the coating. The adhesive strength of the coating was estimated according to the American Society for Testing and Materials (ASTM) C633-79. The melting state of the spray droplet was examined from the coating microstructure. It was found that the melting state of spray particles had a significant effect on the adhesive strength of HVOF sprayed Ni-based coatings. The significant melting of the spray particle did not contribute to the increase in the adhesion of HVOF metallic coatings. On the other hand, the deposition of a partially melted large particle contributed to the substantial improvement of adhesive strength of the HVOF coating. The subsequent coating presented a dense microstructure and yielded an adhesive strength of more than 76 MPa, which was double that of the coating deposited with completely molten particles. It can be suggested that the good melting of the spray particle is mainly related to the mechanical interlocking effect, which reaches the limited and approximately defined adhesive strength up to 40–50 MPa.     

Corrosion fatigue behavior of a steel with sprayed coatings

This paper describes the corrosion fatigue behavior and fracture mechanisms of a steel with different sprayed coatings. Rotating bending fatigue tests were conducted in 3% NaCl solution using specimens of a medium carbon steel with sprayed coatings of a ceramic (Cr₂O₃), a cermet (WC-12%Co) and two metals (Ni-11 % P and Al-2% Zn). The corrosion fatigue process was basically the same for ceramic, cermet, and Ni-11 % P sprayed specimens. That is, the corrosive media could be supplied from the specimen surface to the substrate through cracks initiated during fatigue cycling and/or pores in the coatings, and thus corrosion pits were generated followed by subsequent crack initiation and growth in the substrate. The corrosion fatigue strength of ceramic sprayed specimens was slightly improved compared to that of the substrate steel because the under-coating (Ni-5%A1) could impede the penetration of the corrosive media although the ceramic coating had a poor resistance to cracking under cyclic loading. Cermet sprayed specimens also exhibited improved corrosion fatigue strength because of the high resistance to cracking and the low volume fraction of pores of the coating. In Ni-11 % Psprayed specimens, cracks were initiated in the coating even at low stress levels; thus the corrosion fatigue strength was the same as that of the substrate. Anodic dissolution took place in Al-2 % Zn coating because the coating was electrochemically poor, and thus the substrate was cathodically protected. Therefore, the corrosion fatigue strength of Al-2 % Zn sprayed specimens was enhanced to as high as the fatigue strength of the substrate in room air. Based on the experimental results, a dual-layer coating consisting of WC-12%Co and Al-2%Zn was fatigue tested. The coating was effective at low stress levels and exhibited long life under conditions where corrosion fatigue strength was critical.     

提高高速电弧喷涂再制造曲轴涂层结合强度的途径

分析了再制造发动机曲轴表面涂层结合强度低的原因,介绍了机器人自动化高速电弧喷涂技术、各种涂层重熔技术、高速电弧喷枪改进技术及复合梯度涂层材料设计在提高高速电弧喷涂再制造曲轴涂层结合强度中的应用。     

树脂基复合材料用陶瓷涂层防护性能分析

采用等离子喷涂铝粉作为打底材料在碳纤维增强聚酰亚胺复合材料（PMC）基体上制备了Al2O3和ZrO2轻质陶瓷防护涂层，测试了涂层的剪切结合强度、耐热循环性能、抗冲蚀性能、隔热性能。结果表明，等离子喷涂铝粉作打底层的涂层系统，性能优于电弧喷铝或电弧喷锌作打底层的涂层系统。带有Al2O3涂层的试样失重不到基体材料失重的1／3，Al2O3和ZrO2陶瓷涂层都可以为聚酰亚胺复合材料基体提供有效的冲蚀防护。Al2O3和ZrO2陶瓷涂层都可以为聚酰亚胺复合材料基体提供有效的隔热防护，ZrO2涂层隔热性能优于Al2O3涂层。     

新型Zn-22Al-Mg-Re合金涂层性能研究

使用高速电弧喷涂技术在Q420钢基体上制备了新型Zn-22Al-Mg-Re合金涂层,通过SEM,Cu加速乙酸盐雾实验和电化学工作站等手段研究了其微观形貌、结合强度、耐蚀性能,并与纯Zn和Zn-15Al涂层进行了比较。结果表明,Zn-22Al-Mg-Re合金涂层的结合强度高、腐蚀电位低、腐蚀电流小;腐蚀产物较为稳定,呈细小致密的针状,具有良好的自封闭性;合金涂层的阴极保护能力和耐蚀性能均优于纯Zn和Zn-15Al涂层。