共查询到20条相似文献,搜索用时 187 毫秒
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以Ni/Al,NiCr为粘结层材料,Cr2O3为陶瓷层,用等离子喷涂技术在45#钢上制得了Ni/Al Cr2O3和NiCr Cr2O3双层涂层,通过电化学方法对带涂层的试样的腐蚀行为进行了研究,并采用扫描电镜对双层涂层的腐蚀形貌进行了分析。结果表明,在有盐性介质存在的情形下,NiCr比Ni/Al有更好的耐蚀性。 相似文献
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Al/Al2O3复合材料具有密度小、耐磨、抗高温、抗热震性好等多方面的优异性能,应用日趋广泛.本文选择再造粒的方法制备出了几种配比不同的Al/Al2O3复合粉体,比较不同配比的复合粉体的物理性质.对复合粉体进行了火焰喷涂,对喷涂后获得的涂层进行了耐腐蚀性能的检测.Al/Al2O3复合粉体的流动性随着Al2O3含量增加越来越好,Al2O3的质量分数为75%的粉末的流动性最好.而Al2O3的质量分数为80%的涂层的耐腐蚀性能最好. 相似文献
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利用搪瓷涂层的制备工艺在Q235A钢表面制备Al2O3-瓷釉复合陶瓷涂层,研究了瓷釉粒度、Al2O3陶瓷颗粒的粒度和体积分数对复合涂层耐冲蚀磨损性能的影响。结果表明:过渡层原料瓷釉粒度为16μm时获得涂搪性较好;硬质耐磨相的加入可显著提高复合涂层的耐冲蚀性能;本实验中在45°冲蚀角、15 MPa冲蚀气压、2.2 kg冲砂量的冲蚀实验条件下Al2O3粒度为50μm、体积分数为30%时涂层具有很好的耐冲蚀性,是无硬质相搪瓷层的4倍。 相似文献
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阐述了Ni/Al2 O3 复合颗粒在生产中的应用 ,讨论了在Al2 O3 陶瓷颗粒上形成Ni膜的三种方法 ,分析了这些方法的优缺点。 相似文献
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在45#钢基体上制备了n-Al2O3/Ni和n-SiC–Al2O3/Ni复合刷镀层,采用能谱仪(EDS)、X射线衍射仪(XRD)、扫描电镜(SEM)和T-11球盘式磨损试验机等设备对比研究了2种复合刷镀层的组织及性能。EDS分析结果表明,n–Al2O3/Ni复合刷镀层中纳米颗粒特征元素Al的质量分数为5.65%,n-SiC–Al2O3/Ni复合刷镀层中纳米颗粒特征元素Al的质量分数为5.63%,Si元素的质量分数为4.86%。SEM分析结果表明,与n-Al2O3/Ni复合刷镀层相比,n-SiC–Al2O3/Ni复合刷镀层的表面更加平整,组织更加细化。n-SiC–Al2O3/Ni和n-Al2O3/Ni复合刷镀层的显微硬度分别为587HV和555HV,n-SiC–Al2O3/Ni复合刷镀层的耐磨性是n-Al2O3/Ni复合刷镀层的1.7倍。 相似文献
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Mitra Akhtari Zavareh Ahmed Aly Diaa Mohammed Sarhan Ramin Karimzadeh Ramesh Singh A./l.Kuldip Singh 《Ceramics International》2018,44(6):5967-5975
Corrosion is the deterioration of materials by chemical interaction with their environment. In the oil and gas industry, corrosion of the pipelines and other equipment is one of the leading causes of failure and the corrosion-related costs are very high. Hence, corrosion protection is an essential requirement. In this study, the objective is to analysis of the corrosion protection behavior of spray Alumina-Titania (Al2O3-TiO2) oxide ceramic coating on carbon steel pipes C45 using two different thermal spray coatings processes. These two different thermal spraying coating, High velocity oxy-fuel (HVOF) and plasma thermal spraying techniques can be used instead of extensive treatment by expensive chemical formation of coatings on pipelines and equipment to improve or restore a component's surface properties or dimensions and to protect them from corrosion. Molten or semi-molten ceramic composite powders are sprayed on the surface in order to produce a dense coating layer. FESEM of coated samples showed that a high temperature of plasma coating method end in melting the ceramic powders and creation of completely melted regions on the coated samples’ surface compared to HVOF coating techniques. Corrosion testing of coated samples in seawater (3.5% NaCl) was conducted within 30 days. Electrochemical impedance spectroscopy (EIS) as well as potentiodynamic polarization outcomes represented that the corrosion resistivity of plasma coating technique for this type of ceramic composite is better than HVOF coating technique. However, both types of coating techniques are protecting the substrate against seawater. 相似文献
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采用热化学反应方法在N80钢基体表面制备了陶瓷涂层。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、体视显微镜和划痕仪对涂层的物相结构、组织形貌和膜基界面结合力进行了研究,利用失重法在20%的质量分数盐酸溶液中测试了涂层的耐蚀性能。结果表明:在600℃固化温度下,以SiO2粉体和SiO2、Al2O3、MgO等两类不同骨料制得的陶瓷涂层中,前者无新相生成,涂层与基体界面结合力24 N;后者有新相MgAl2O4生成,且涂层比较致密,涂层与基体界面结合力约40 N。以水玻璃作粘结剂的复合氧化物陶瓷涂层的表面致密度、平整性均优于以磷酸氢铝作粘结剂的涂层。酸腐蚀测试表明,以水玻璃作粘结剂的复合氧化物陶瓷涂层的平均腐蚀速率约为基体的1/2左右。 相似文献
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采用大气等离子喷涂方法在马氏体钢基体上制备TiC+(Al2O3/TiC)+Al2O3复合涂层。对涂层的抗热冲击性能、热氧化处理前后截面形貌及成分进行了分析,利用电化学方法测量涂层的耐腐蚀性能。结果表明,这种复合涂层在高温下具有良好的自愈合能力及抗热冲击性能,涂层样品在800、700、600℃和500℃下的抗热冲击次数分... 相似文献
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This paper focused on the corrosion resistance of cold spray Al–Al_2O_3composite coatings used on carbon steel pipe surfaces under thermal insulation. Al–Al_2O_3coatings were produced on the carbon steel pipe surface by cold spray(CS) technology. Experimental apparatus was built to test the corrosion resistance of coatings beneath mineral wool insulation under isothermal, thermal cycling and wet/dry conditions. The results showed that when α-Al_2O_3 was added in spraying powder, the coating could obtain higher hardness and a denser microstructure. From corrosionunder-insulation(CUI) tests, Al–Al_2O_3CS coatings were proven to be efficient in protecting carbon steel pipe from CUI mainly owning to lamellar microstructures of coatings. There was no evidence to show that α-Al_2O_3 might bring any negative effect on corrosion resistance. Al–Al_2O_3CS coatings were sensitive to the chloride ion concentration. When these coatings were exposed to higher concentrations of NaC l, the coating's exhibited faster degradation. 相似文献
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在乙醇中,分别以盐酸、醋酸为催化剂,以正硅酸乙酯、钛酸正丁酯、硝酸铝、氧氯化锆为金属醇盐前躯体,通过分步水解法制备了SiO2-TiO2-Al2O3-ZrO2复合溶胶,利用浸渍法将陈化后的复合溶胶涂覆到不锈钢表面制得透明的复合涂层。对SiO2-TiO2-Al2O3-ZrO2复合涂层进行了差热分析(DTA)、失重分析(TG)、红外光谱(IR)、X射线衍射分析(XRD)以及耐HCl、CuSO4和FeCl3溶液浸泡腐蚀实验。结果表明,涂层中存在TiO、SiO、AlO键的氧化物网状结构,其XRD图中出现了锐钛矿和板钛矿的相结构。该涂层致密,具有良好的耐蚀性能。 相似文献