共查询到16条相似文献,搜索用时 156 毫秒
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FeAl系电热爆炸喷涂层抗高温氧化腐蚀性能对比 总被引:1,自引:0,他引:1
利用金属导体FeAl系合金箔,电热爆炸产生的瞬间高能量冲击波效应,制备FeAI、FeCrAl、FeCrAlRE三种等离子体喷涂层.通过涂层SEM等检测手段,可以看出涂层具有致密的组织结构,同时涂层与基体之间存在较为明显的过渡层.经高温氧化耐蚀性测试等综合分析,结果表明,FeCrAlRE喷涂层耐高温氧化腐蚀能力较FeCrAl平均提高2.20倍,较FeAl喷涂层增加3.83倍,同时还研究了三种等离子体喷涂层的高温氧化过程变化规律. 相似文献
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钟颖虹 《热处理技术与装备》2008,29(6)
采用电热爆炸喷涂法在DZ125高温合金表面制备了NiAl涂层,研究了该涂层1050℃下的循环氧化行为.利用扫描电镜(SEM)、能谱仪(EDS)和显微硬度计对热循环后的试样进行了分析.结果表明.所制备的NiAl涂层致密、晶粒细小、与基体结合良好.涂层在1050℃热循环后其表面生成了致密的Al2O3氧化层,这层Al2O3保护膜能阻止氧向内扩散,减缓内层的氧化速率,从而起到了保护基体的作用.经热循环后,基体与涂层的硬度均有所降低. 相似文献
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利用自制的电热爆炸超高速喷涂装置在GH3039高温合金基体上制备了NiAl-TiC复合涂层,采用X射线衍射仪(XRD)、扫描电镜(SEM)及能谱分析仪(EDS)对涂层的相组成、形貌和组织成分进行了分析,对涂层与基体的结合强度进行了测定,并利用显微硬度计测定了涂层硬度.结果表明,涂层仅由NiAl和TiC两相组成,没有新的相和氧化物生成;涂层致密均匀,没有分层现象,基体与涂层间发生了元素扩散现象,为扩散-冶金结合.涂层与基体的结合强度大于112.25 MPa,涂层的硬度平均在900 HV0.5左右. 相似文献
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Shi-cheng Wei Bin-shi Xu Hai-dou Wang Guo Jin Hong Lv 《Surface & coatings technology》2007,201(15):6768-6771
As a new spraying technology used in the remanufacturing engineering, electro-thermal explosion plasma spraying technique holds a lot of advantages. Three kinds of FeAl-base plasma spraying coatings, FeAl, FeCrAl and FeCrAlRE coatings, were prepared by using instantaneous high-energy shock wave effect produced by the electro-thermal explosion of metal conductor alloy foil of FeAl base. Nano-structure and micro-structure especially a metallurgy binding layer with FeAl-base body are formed. It is shown that microstructures of the FeCrAl and FeCrAlRE coatings were greatly improved due to the addition of Cr and RE. Meanwhile corrosion changing laws of these three plasma spray coatings can be gained after anti-corrosion tests under the conditions of high temperature and then sequentially select better electro-thermal explosion plasma spray coating of anti-corrosion and heat resistance. 相似文献
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目的提高金属/陶瓷隔热涂层体系在海洋环境下的耐腐蚀性能。方法利用冷喷涂方法制备NiAl复合打底层和Ni CoCrAlY粘结层,与等离子喷涂制备的8YSZ陶瓷层构成适用于海洋环境的多层结构耐蚀隔热涂层体系。利用FE-SEM分别观察喷涂态粘结层和陶瓷层的表面、横截面形貌,通过EDS分析涂层元素分布;利用XRD分析表征涂层的物相组成;借助万能材料试验机,采用拉伸法测试涂层结合强度;利用热循环试验和焰流冲刷试验测试涂层的耐高温性能。结果微观分析表明,冷喷涂制备的NiAl复合打底层和Ni CoCrAlY粘结层形貌致密,涂层材料未发生明显氧化,颗粒变形程度不一,粘结层与基体间的结合强度约为18.4 MPa,粘结层与8YSZ陶瓷层界面结合紧密。陶瓷层物相结构和成分稳定,涂层经12次热震循环和1000个周期的高温焰流冲击后,表面未出现开裂、起皮和脱落。结论采用冷喷涂法和等离子喷涂法联合制备的耐蚀隔热复合涂层体系具备良好的耐热性和耐腐蚀性。冷喷涂制备的金属涂层结构致密,孔隙率低,与陶瓷层结合良好,能够有效提高涂层体系在腐蚀性环境中的耐蚀性能。NiAl复合涂层可以缓解Ni CoCrAlY粘结层和铝合金基材间的热匹配问题,增强涂层的结合性能。 相似文献
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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。 相似文献
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采用电热爆炸喷涂技术在铝合金基体上制备钼涂层,用SEM、划痕仪、显微硬度计、表面粗糙度仪、微磨损试验机等表征了涂层性能。借助正交试验方法分析了钼涂层制备中各工艺参数对涂层质量的影响,确定了最佳工艺参数。结果表明:用电热爆炸喷涂方法制备的钼涂层均匀致密,孔隙率低;涂层与基体形成冶金结合,结合强度高;涂层硬度为基体的4.9倍,体积磨损量仅为基体的11.2%,耐磨性大幅增加。电爆炸喷涂的工艺参数中,对涂层质量和结合力影响最大的是喷涂距离,其次是喷涂次数,影响最小的是喷涂电压。 相似文献
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Feng Zhang Cunguan Xu Hao Lan Chuanbing Huang Yang Zhou Lingzhong Du Weigang Zhang 《Journal of Thermal Spray Technology》2014,23(6):1019-1028
A novel NiTi/BN composite abradable coating and two traditional Ni/C and Ni/BN coatings were manufactured with NiAl as the bond layer using thermal spray technology and their corrosion behaviors were investigated. In salt spray corrosion testing of the Ni/BN coating, defective sites of the metal matrix were corroded preferentially. Simulated occlusion experiments and electrochemical tests indicated that migration of ions resulted in pH decrease and Cl? enrichment in defects, and a more aggressive electrolyte led to a decrease of the corrosion potential of the metal inside defects but an increase of the corrosion current density, representing an autocatalytic corrosion process. Moreover, galvanic corrosion between the top and bond coatings of the abradable system was studied via the electrochemical technique. The results showed that, for the NiTi/BN, Ni/BN, and Ni/graphite coatings with a NiAl bond coating, current flow was generated between the anode and cathode. The NiTi/BN coating acted as the cathode due to its passivation, while the Ni/BN and Ni/graphite coatings acted as the anode because of their lower corrosion potential compared with the NiAl coating. The anode suffered serious corrosion damage due to galvanic corrosion, while the cathode corroded only slightly. 相似文献
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NiAl-TiB2 composite coatings with 0, 10 and 20 wt.% TiB2 were synthesized on the Ni-based superalloy substrate using electro-thermal explosion ultrahigh speed spraying technology. The microstructure analysis shows that the coatings consist of submicron grains. The bond between coatings and substrate is metallic cohesion. TiB2 as a powerful reinforcement is doped in NiAl for increasing its hardness. The isothermal oxidation test is carried out for the composite coatings at 1100 °C in air. The result shows that the oxidation resistance of NiAl coating is higher than that of NiAl-10TiB2 and NiAl-20TiB2 coatings. The phases of oxides on the coatings during the process at high temperature have been analyzed by X-ray diffraction. The results show that Al2O3 and Cr2O3 coexistence on surface of NiAl coating, while Al2O3, Cr2O3, TiO2 and a small amount of NiO form on surface of NiAl-10TiB2 and NiAl-20TiB2 coatings after oxidation for 4 h. 相似文献