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以WCB钢为基材,采用国产化小型超音速火焰喷涂(HVOF)设备喷涂Ni60镍基合金涂层.通过扫描电子显微镜(SEM)及能谱仪(EDS)分析、显微硬度计测试、拉伸试验、磨粒磨损试验和冲蚀磨损试验,考察了Ni60涂层的组织形貌、微观结构、孔隙率、显微硬度、结合强度、耐磨粒磨损性能和耐冲蚀磨损性能,并对实际小尺寸疏水阀门内壁进行喷涂,分析该工艺的实际可行性.结果表明,所制备的Ni60涂层的孔隙率为(0.27±0.04)%,显微硬度为843 HV(载荷300 g),界面结合强度高达200 MPa以上.该涂层主要由弥散分布着碳化物等硬质相的Ni基固溶体组成,具有比WCB基材更优良的耐磨粒磨损和耐冲蚀性能,其冲蚀失效形式主要为犁沟加塑形变形.小尺寸阀门内壁经喷涂后,表面涂层质量及配合性均符合要求. 相似文献
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以5~15μm的超细WC-10Co-4Cr粉末为材料,分别采用常规超音速火焰喷涂(HVOF)和低温超音速火焰喷涂(LTHVOF)技术制备WC-10Co-4Cr涂层。借助于扫描电子显微镜、粗糙度测试仪、显微硬度仪和3D形貌仪对涂层的显微结构、粗糙度和显微硬度进行了表征。结果表明:LT-HVOF下WC-10Co-4Cr粒子为微熔化状态,HVOF下WC-10Co-4Cr粒子为半熔化状态;HVOF涂层的主晶相为W2C,LT-HVOF涂层的主晶相为WC;LT-HVOF涂层的粗糙度(Ra约为1.22μm)远低于HVOF涂层的,而显微硬度[Hv0.3=1 316±85]和断裂韧性(KC=3.23MPa·m1/2)均高于HVOF涂层的。HVOF涂层的裂纹沿富Cr带扩展,LT-HVOF涂层的裂纹扩展到WC硬质相时偏转至CoCr黏结相,富Cr带的存在对涂层的韧性有明显降低作用。 相似文献
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为提高金属硬密封球阀的抗磨损和耐腐蚀性能,采用超音速火焰喷涂(HVOF)工艺,在1Cr13不锈钢钢基体上制备了WC-10Co4Cr涂层。测试了涂层与基体的结合强度以及涂层的显微硬度、气孔率、抗磨损和腐蚀等性能。结果表明:WC-10Co4Cr涂层与粉末的相结构基本一致,涂层的显微硬度高,组织结构致密且与基体的结合强度高;另外,WC-10Co4Cr涂层还表现出较好的抗腐蚀性能和优异的抗磨粒磨损性能。生产实践表明,这些球阀密封性能好,开关灵活且耐磨和耐腐蚀性能良好。 相似文献
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采用等离子物理气相沉积的方法在316L不锈钢表面制备了AlCoCrFeNi高熵合金涂层,研究了喷涂距离和电流对高熵合金涂层物相组成、表面形貌、截面形貌、硬度、结合强度和耐磨性的影响。结果表明,不同喷涂距离和电流下,高熵合金涂层都主要由BCC、B2和FCC相组成;随着电流或者喷涂距离增加,涂层中BCC平均晶粒尺寸先增后减。当喷涂距离为460 mm时,随着电流从1600 A增加至2000 A,涂层平均摩擦系数逐渐增大,表面和截面硬度先减后增,涂层结合力和结合强度先增大后减小,涂层的磨损率先增加后减小;当电流为1800 A时,随着喷涂距离从420 mm增加至500 mm,涂层平均摩擦系数逐渐减小,表面硬度先减后增,截面硬度先增后减,涂层结合力和结合强度逐渐增大,涂层的磨损率逐渐减小。高熵合金涂层的磨损率与涂层表面硬度和内聚强度都有一定相关性。 相似文献
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利用反应超音速火焰喷涂合成技术制备了3种不同Mo含量的TiC-Ni金属陶瓷涂层,并对涂层进行了组织和性能研究.结果表明,在涂层中添加适量的金属Mo(5%),可以提高涂层的显微硬度和耐冲蚀磨损性能,但Mo含量太大时(10%),涂层的显微硬度和耐冲蚀磨损性能又有所降低.分析认为,适量Mo的添加可以改善液态金属Ni对TiC的润湿性,提高涂层的致密性,从而提高涂层的硬度和耐冲蚀磨损性能;Mo含量太大时,涂层中的环形相过分发达,又会使涂层硬度和耐冲蚀磨损性能降低. 相似文献
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采用共混-喷涂-热压的方法,在316L不锈钢表面上制备了10μm厚不同导电填料含量的石墨/聚酰亚胺(G/PI)、纳米炭/聚酰亚胺(C/PI)复合涂层。通过扫描电镜(SEM)、动电位极化、粘附力测试,以及接触电阻和水接触角测量,比较了含40%~70%(质量分数)填料的两种涂层的各项物理化学性质及其对316L不锈钢耐腐蚀性能的影响。结果表明,C/PI与G/PI涂层均能有效提高316L不锈钢基板的疏水性及耐蚀性,但G/PI涂层与316L不锈钢基板的结合力更好,更适合用作316L不锈钢双极板的耐蚀涂层。在含0.5 mol/L H_2SO_4和5 mg/L F-的溶液中,40%填料含量的G/PI复合涂层的耐蚀性最好,水接触角为86.6°。当组装扭矩为4.0 N·m时,70%G/PI涂层与碳纸的接触电阻为17.24 mΩ·cm~2,较316L不锈钢降低了约80.49%。 相似文献
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采用失重法对316L不锈钢、Ti、Ni 3种材料在不同条件下的耐乳酸腐蚀行为进行了研究,详细考察了反应温度和反应时间对316L腐蚀的影响。结果表明,316L在L-乳酸中腐蚀速率随反应温度的升高而增大,在反应时间36 h,反应温度90℃和120℃下,腐蚀速率分别为0.382 mm/a和0.801 3 mm/a,属尚耐腐蚀;150℃和180℃下腐蚀速率分别为3.85 mm/a和6.01 mm/a,属不耐腐蚀。金相显微镜分析表明,316L不锈钢表面在较低温度的乳酸中以点蚀为主。现场挂片腐蚀实验结果表明,当温度低于120℃,316L可以作为乳酸生产设备的选材。 相似文献
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Seyyed Hashem Mousavi Anijdan Masoud Sabzi Mohsen Asadian Hamid Reza Jafarian 《International Journal of Applied Ceramic Technology》2019,16(1):243-253
WC coating was deposited on the polished and cleaned 316L stainless steel by Hot Filament Chemical Vapor Deposition (HFCVD) technique at 400°C and 500°C. Field Emission Gun Scanning Electron Microscope (FEG-SEM) was used to study the corrosion morphology of the WC coatings. Energy dispersive spectroscopy (EDS) was used to analyze the chemical composition of the coatings. Coating porosity was measured by immersion in water. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques were used to study the corrosion behavior of the coating in the solution of 1 mol/L H2SO4. Results showed that the WC coatings have a honeycomb microstructure where its porosity was increased at higher temperature of the sub-layer. Also, the WC coating significantly increases the corrosion resistance of 316L stainless steel. And increasing the sub-layer temperature in the HFCVD method reduces the corrosion resistance of the WC coating. Corrosion morphology was indicative of pitting corrosion of the WC coating. 相似文献
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双相不锈钢在含氯介质中的应用探讨 总被引:1,自引:0,他引:1
叶国平 《硫磷设计与粉体工程》2007,(1):35-37
通用的304L、316L等奥氏体不镑钢在含氯介质中的耐局部腐蚀性能较差,常见的破坏形态是点腐蚀。介绍了双相不镑钢的特性,阐述其抗局部腐蚀性能,尽管双相不镑钢的板材和管材目前主要还依赖进口。价格较高。一次性投资高,但因提高了装置的开工率,技术经济综合指标较好。 相似文献
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Mahendran Logesh Arumugam Marimuthu Jose M. F. Ferreira Praveen Ramakrishnan Anbalagan. M. Ballamurugan 《Journal of the American Ceramic Society》2023,106(6):3843-3852
This work reports on a novel approach to deposit composite coatings based on biphasic calcium phosphate (BCP) incorporating graphene oxide (GO) on 316L stainless steel (316L SS) and on its protective nature against corrosion in the simulated body fluid (SBF). For this purpose, 2-dimensional GO was successfully incorporated in 1% and 3% weight ratios as mechanical strength enhancer and pore size reducer for the prepared coatings. It was observed that upon increasing the GO content, the corrosion rate was drastically decreased when compared to pristine BCP coating. The corrosion resistance polarization results are in good agreement with the test results obtained for SBF immersion study. The size of the particles has significantly decreased, as shown by transmission electron microscopy (from 190 to 27 nm). The experimental results indicate that the composite hydroxyapatite–β-tricalcium phosphate–GO (HAp–β-TCP–GO) coatings enhanced the corrosion resistance of the surgical grade 316L SS, turning it a better implanting option for orthopedic applications. 相似文献
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Kean-Khoon Chew Sharif Hussein Sharif Zein Abdul Latif Ahmad David S. McPhail Muhammad Faiq Abdullah 《Journal of Industrial and Engineering Chemistry》2013,19(4):1123-1129
HA was coated on stainless steel (SS) 316L by using electrophoretic deposition to impart corrosion resistance upon SS 316L. Consequently, corrosion behaviour of HA coated SS 316L deposited from applied voltages 10 V to 60 V (denoted as HA/SS316L-10V until -60V) was evaluated in comparison with pristine SS 316L by various electrochemical studies. As results, linear potentiodynamic polarisation result suggested that HA/SS316L-40V exhibits highest open circuit potential indicating that successful protection of HA coating. Additionally, cyclic polarisation studies revealed that HA coated SS 316L improves pitting corrosion resistance. Finally, EIS results demonstrated that higher polarisation resistance and lower capacitance values for HA/SS316L-40V. 相似文献
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采用自制的实验装置,模拟PTA生产装置中回转式干燥机蒸汽列管工作条件,对奥氏体不锈钢0Cr18Ni9(304)、00Cr17Nd4Mo2(316 L)、00Cr19Ni13M03(317 L)和双相不锈钢00Cr22Ni5Mo3N(2205)在含有溴离子和对苯二甲酸颗粒的醋酸介质中,进行腐蚀磨损性能研究。结果表明,4种不锈钢的腐蚀磨损速率随着腐蚀介质温度的升高而增加;在低温时,腐蚀磨损速率差别不大;当温度超过80℃以后,腐蚀磨损性能的差异变大,其中2205的耐腐蚀磨损性能最好,其次为317 L,316 L,而304则最差。相同条件下,腐蚀磨损速率大于均匀腐蚀速率。建议用2205代替316 L制作PTA同转蒸汽管干燥机的加热列管。 相似文献
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《Ceramics International》2017,43(2):1731-1739
This study investigates the surface characteristics, in vitro biocompatibility and electrochemical behaviour of nanoporous niobium incorporated titanium dioxide (Nb-incorporated TiO2) coated 316L stainless steel (SS) for orthopaedic applications. The coating material was synthesized by sol-gel methodology and was deposited on 316L SS by using spin coating technique and heat treatment. The experimental conditions were optimized to obtain a coating with nanoporous morphology. The coating was characterized using attenuated total reflectance-Infrared spectroscopy (ATR-IR), X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX), atomic force microscopy (AFM) and transmission electron microscopy (TEM). The analysis confirmed the formation of a crystalline nanoporous Nb-incorporated TiO2 coating with hydrophilic nature. Mechanical studies validated that the coating has excellent adhesion to the specimen and appreciable hardness value. In vitro bioactivity test confirmed that the nanoporous morphology of the coating facilitated enhanced hydroxyapatite (HAp) growth. Electrochemical studies established that the insulative nature of the coating provides excellent corrosion resistance to 316L SS. 相似文献