电热爆炸喷涂3Cr13涂层的微观结构和微观力学性能

采用电热爆炸定向喷涂技术,在45钢表面制备了3Cr13（AISI420）不锈钢涂层。用扫描电镜、EDAX和X衍射仪分析了涂层的微观结构;用显微硬度计和纳米压痕仪测试了涂层的微观力学性能。结果表明：电热爆炸喷涂3Cr13涂层致密,孔隙率为0．7％;涂层的相组成主要为α-Fe、Fe-Cr、α-Fe2O3、Cr2O3等,其中氧化物的含量较少;在涂层与基体的过渡区附近元素的互扩散现象较明显,证明涂层与基体主要是冶金结合。涂层的显微硬度最高达到了677．7HV0．1,平均值为626．4HV0．1,纳米压痕硬度达到了10．3GPa,弹性模量为220．3GPa。     

电热爆炸喷涂WC/Co涂层组织和性能研究

利用电热爆炸喷涂技术,在45钢表面制备了WC／Co耐磨涂层,使用SEM和XRD分析了涂层的组织与相结构,使用显微硬度计和纳米压痕仪测试了涂层的硬度和弹性模量。结果发现,电热爆炸喷涂WC／Co涂层致密,无明显的层状结构;涂层的显微硬度最高达到了2836HV0．1,平均为1704HV0．1;纳米压痕仪测得涂层的弹性模量为346．8GPa;涂层的相组成主要为WC和W2C;在涂层与基体的结合区,出现柱状晶,证明涂层与基体主要是冶金结合。     

电热定向爆炸制备高速钢涂层的试验研究

采用电热爆炸定向喷涂工艺在45钢基体上制备W6Mo5Cr4V2(M2)高速钢涂层。借助扫描电镜、显微硬度计分别对涂层显微组织、孔隙率、涂层基体界面结合以及涂层的硬度进行了测试。结果表明，电热爆炸定向喷涂制备的涂层组织晶粒明显细化，涂层孔隙率低；涂层与基体界面为冶金结合，且结合良好，存在一个熔合区；涂层硬度均明显高于W6MoSCr4V2喷涂材料原始硬度，最高达到954HV。     

电热爆炸喷涂和等离子喷涂联合法制备热障涂层的研究

采用电热爆炸喷涂和等离子喷涂联合制备热障涂层,以电热爆炸喷涂法在DZ125合金表面制备NiCoCrAlY粘结层,以等离子喷涂技术制备陶瓷顶层。利用扫描电镜(SEM)和X射线衍射(XRD)仪对所制备的粘结层进行分析,结果表明:电热爆炸喷涂的粘结层与基体结合良好,喷涂态的粘结层的相主要由Ni3Al组成。采用联合法制备的热障涂层,在喷涂态的陶瓷层、粘结层、基体3者结合良好,界面清晰。在高温热循环过程中,粘结层/陶瓷层界面间生成了连续、致密的Al2O3膜,阻碍粘结层的氧化。粘结层/TGO界面产生平行于界面的裂纹,是导致热障涂层失效的主要原因。     

等离子喷涂钼基非晶-纳米晶复合涂层的组织与性能

一种多元素钼基非晶-纳米晶合金粉末(含C、Si、B、Cr、Fe、Ni、Mo等)作为喷涂材料,用大气等离子喷涂在316L不锈钢基体上制备涂层,用X射线衍射仪、扫描电镜、透射电镜、显微硬度仪分析测量涂层的组织和性能,并用谢乐公式计算晶粒尺寸。结果表明：所制备的涂层均匀致密,涂层含有非晶和纳米晶,颗粒尺寸为10～50nm;这种非晶纳米晶复合涂层的硬度和弹性模量分别高达1055HV和214．40GPa。     

电热线爆定向喷涂制备stellite/WC复合涂层的特性

利用电热线爆定向喷涂方法在45钢基体上制备了stellite/WC复合涂层,运用扫描电镜及能谱分析对复合涂层的形貌、微观结构以及涂层的基体结合机理进行了分析,利用纳米硬度计测量了复合涂层的硬度和弹性模量.结果表明:涂层致密,无层状结构出现;喷涂过程中涂层颗粒在基体上的快速凝固使得涂层晶粒细小均匀,晶粒为200～500 nm;涂层与基体界面发生了元素扩散现象,为扩散-冶金结合;涂层硬度的最大值为18.6 GPa,模量的最大值为310 GPa,硬度和模量沿横截面都呈现先增加而后减小的变化趋势.     

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.     

电热爆炸喷涂法制备Ni-Co-Cr-Al-Y合金粘结层的氧化行为

采用电热爆炸喷涂法在DZ125合金表面制备了Ni-Co-Cr-Al-Y合金粘结层,利用扫描电镜(SEM)和X射线衍射仪(XRD)对所制备的粘结层进行了分析.结果表明,所制备的粘结层与基体结合良好,晶粒细小.粘结层在1050℃热循环后其表面生成了致密的Al2O3氧化层,起到了保护基体的作用.试验结果表明,采用电热爆炸喷涂法能够顺利制备Ni-Co-Cr-Al-Y合金涂层.     

电热爆炸法原位合成Fe-Al系金属间化合物涂层的研究

利用电热爆炸喷涂装置将纯铝喷涂到Q235钢基体上原位合成FeAl和Fe3Al金属间化合物涂层,通过X射线衍射仪、扫描电镜、能谱仪和显微硬度计对涂层的物相进行了分析.结果表明,采用电热爆炸法在合适的喷涂距离下可合成具有亚微米晶的Fe3Al金属间化合物涂层,该涂层的硬度达630 HV0.05.涂层与Q235钢基体实现了冶金结合.     

金属喷涂、堆焊与修复——金属喷涂工艺与设备

富氧条件下电弧喷涂反应合成纳米氧化铝粉末;高速电弧喷涂FeCrNi／CBN复合涂层的组织与性能;含碳化物陶瓷粉芯丝材电弧喷涂层的结构和性能;应用于反应釜的超音速电弧喷涂涂层的耐蚀性;高速电弧喷涂涂层的结合强度与结合方式研究;等离子喷涂纳米团聚体粉末的熔化特性研究;等离子熔覆铁基涂层开裂行为研究。     

Effect of Al content on high temperature erosion properties of arc-sprayed FeMnCrAl/Cr_3C_2 coatings

Three types of FeMnCrAl/Cr3C2 coatings with different Al content were deposited on 20# steel substrates by the high velocity arc spraying (HVAS) process. Surface microstructures of the coatings were analyzed by optical microscopy (OM) and X-ray diffractometry (XRD). High temperature erosion (HTE) tests were performed in an erosion tester at different impact angles. The surface morphologies of the eroded coatings were observed on a field emission scanning electron microscope(FE-SEM). The laminated structure is found on all the prepared coatings with the porosity and oxide fraction in the coatings decreasing with the Al content from 0 to 15% (mass fraction). Sample FA3 with 15% Al, possessing the lowest porosity and oxide fraction, has the best HTE resistance, which demonstrates that Al addition can improve the HTE resistance of the coatings. The erosion rate of sample FA1 exhibits a maximum value at 90° impact angle. The maximum erosion rates of both FA2 and FA3 samples appear in the range of 60°-90° impact angles. Erosion loss of the coatings occurs through brittle breaking, cutting and fatigue spalling.     

电弧及高速电弧喷涂FeCrAl涂层的微观性能研究

用相同的喷砂和喷涂工艺参数,分别在４５＾＃钢基体上制备了电弧喷涂与高速电弧喷涂ＦｅＣｒＡｌ涂层,用扫描电镜分析了它们的表面形貌,测试分析了两种涂层及各种基体在距涂层－基体界面不同距离上的显微硬度值,得到了电弧喷涂及高速电弧喷涂基体上的热影响区宽度,讨论了涂层的显微组织对其硬度的影响,并测试分析了涂层和基体的截面线波动系数。试验结果表明,高速电弧喷涂ＦｅＣｒＡｌ涂层比普通电弧喷涂ＦｅＣｒＡｌ涂人有更     

Oxidation performance of Fe-Al/WC composite coatings produced by high velocity arc sprayed at 800 ℃

Fe-Al/WC intermetallic composite coatings were prepared by high velocity arc spraying (HVAS) technology on 20G steel and the oxidation performance of Fe-Al/WC composite coatings was studied. The results demonstrate that the kinetics curve of oxidation approximately follows the logarithmic law and the oxidation velocity of Fe-Al/WC composite coatings is less than that of 20G steel after 5 h. The composition of oxidized coating is mainly composed of Al2O3, Fe2O3, Fe3O4 and FeO. These phases distribute unevenly. The protective Al2O3 film firstly forms and preserves the coatings from further oxidation.     

高速电弧喷涂Fe-Al涂层在800℃下的氧化性能

采用高速电弧喷涂技术(HVAS)在20G钢基体上制备了Fe-Al金属间化合物涂层，测试了涂层在800℃下的氧化性能．结果表明，Fe-Al涂层的氧化动力学曲线近似呈现对数规律，其在5h后的氧化增重低于20G钢；涂层的氧化物为Al2O3、Fe2O3、Fe3O4和FeO等，且其分布不均匀；涂层表面优先形成具有保护性的Al2O3膜，阻止了涂层的进一步氧化。     

高速电弧喷涂Fe-Al/WC复合涂层在800℃下的氧化行为

采用高速电弧喷涂技术 (HVAS)在 2 0G钢基体上制备了Fe Al/WC金属间化合物复合涂层 ,测试了涂层在 80 0℃下的氧化性能。结果表明 ,Fe Al/WC复合涂层的氧化动力学曲线呈现出近似对数规律 ,5h后的氧化速率低于 2 0G钢 ;涂层的氧化物以Al2 O3、Fe2 O3、Fe3O4 和FeO为主 ,且分布不均匀 ;涂层表面优先形成具有保护性的Al2 O3膜 ,阻止了涂层的进一步氧化。     

高速电弧喷涂Fe-Al/WC复合涂层在650℃下的氧化行为

采用高速电弧喷涂技术在20G钢基体上制备了Fe-Al／WC金属间化合物复合涂层，利用热重天平测试了涂层在650℃下的氧化性能。结果表明：Fe-Al／WC复合涂层的氧化动力学曲线近似呈现出对数规律；涂层的氧化物以Al2O3、Fe2O3、Fe3O4和FeO等为主，且其分布不均匀；涂层表面优先形成具有保护性的Al2O3膜，阻止了涂层的进一步氧化。     

Tribological properties of high velocity arc sprayed Fe-Al based composite coatings at elevated temperature

Fe-Al based intermetallic composite coatings were in-situ synthesized using Fe-Al/Cr3C2 or Fe-Al/WC cored wires and high velocity are spraying (HVAS) technology. The tribological properties of the Fe-Al based intermetallic composite coatings were investigated using a ball-on-disc tribotester from room temperature to 650 ℃. The results show that the coatings have relatively high bond strength and micro-hardness. The tribological properties of Fe-Al/Cr3C2 and Fe-Al/WC composite coatings were further analyzed and compared. Low and stable wear rates of the Fe-Al based intermetallic composite coatings were indicated from room temperature to 650 ℃. The excellent wear resistance of the composite coatings in high temperature was discussed.     

Oxidation Performance of Fe-Al/WC Composite Coatings Produced by High Velocity Arc Sprayed at 650℃

The Fe-Al/WC intermetallic composite coatings have been prepared by high velocity arc spraying(HVAS)technology on 20G steel and the oxidation performance of Fe-Al/WC composite coatings has been studied by means of thermogrativmetic analyzer. The results demonstrate that the kinetics curve of oxidation approximately follows the logarithmic law. The composition of the oxidized coating surface mainly is composed of Al2O3, Fe2O3, Fe3O4 and FeO which distribute unevenly. The protective Al2O3 film firstly forms and preserves the coatings from further oxidation.     

Oxidation Performance of Fe-Al/WC Composite Coatings Produced by High Velocity Arc Sprayed at 650 ℃

Fe-Al intermetallics with remarkable high-temperatureintensity and excellent erosion,high-temperatureoxidation and sulfuration resistance are potential lowcost high-temperature structural material.ProducingFe-Al/WC composite coating by high velocity arcspraying(HVAS)on structural materials would notonly obviate the problems faced in fabrication of thesealloys into useful shapes,but also allow the effectiveuse of their outstanding high-temperature performance,which might thus promisingly mak…     

高速电弧喷涂含稀土FeMnCrNiAl/Cr3C2复合涂层的组织与耐磨性能

利用高速电弧喷涂技术在20钢表面分别制备了含稀土和不含稀土的FeMnCrNiAl/Cr3C2涂层。结合光学显微镜、显微硬度、场发射扫描电子显微镜、能谱分析等分析方法对喷涂层的微观组织、显微硬度、结合强度、常温滑动摩擦磨损、高温冲蚀磨损等性能进行研究。结果表明:FeMnCrNiAl/Cr3C2涂层具有较高的结合强度、显微硬度和耐磨性能,加入稀土能降低涂层摩擦系数、提高涂层常温滑动磨损和高温冲蚀磨损性能。