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Al-Si涂层对不锈钢电化学腐蚀行为的影响 被引量:4
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作者 付广艳 俞立艳 +1 位作者 刘群 武永昭 《材料保护》 CAS CSCD 北大核心 2016年第12期5-7,12,共4页
Al-Si涂层能提高不锈钢的耐蚀性,但目前对其缺乏深入研究。采用料浆法与真空扩散相结合的方法在1Cr18Ni9Ti不锈钢表面制备Al-Si、Al-Si-Cr、Al-Si-Y涂层,测试了各涂层在3.5%(质量分数)NaCl溶液和0.05mol/L H_2SO_4+0.25 mol/L Na_2SO_4... Al-Si涂层能提高不锈钢的耐蚀性,但目前对其缺乏深入研究。采用料浆法与真空扩散相结合的方法在1Cr18Ni9Ti不锈钢表面制备Al-Si、Al-Si-Cr、Al-Si-Y涂层,测试了各涂层在3.5%(质量分数)NaCl溶液和0.05mol/L H_2SO_4+0.25 mol/L Na_2SO_4溶液中的电化学腐蚀性能以及其在6.0%FeCl_3溶液中的浸泡失重速率,并观察腐蚀形貌。结果表明:涂层试样的电化学腐蚀性能优于不锈钢基材的,Al-Si、Al-Si-Cr及Al-Si-Y涂层试样在6.0%FeCl_3溶液中的腐蚀失重依次降低,在3.5%NaCl溶液中的腐蚀孔径依次减小,在0.05 mol/L H_2SO_4+0.25 mol/L Na_2SO_4溶液中的腐蚀孔径先减小后增大;涂层使不锈钢耐腐蚀性能有了很大的提高,这是由于涂层表面形成了更为致密的钝化膜。 展开更多
关键词 料浆法 1Cr18Ni9Ti不锈钢 A1-si涂层 电化学腐蚀
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β-Si_3N_4涂层抗脱落性及对高效多晶硅性能的影响 被引量:1
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作者 黄金亮 李永乐 +2 位作者 李飞龙 李丽华 李新利 《太阳能学报》 EI CAS CSCD 北大核心 2017年第12期3271-3275,共5页
采用喷涂法分别制备以α-Si_3N_4粉和β-Si_3N_4粉为原料的坩埚内壁用氮化硅涂层,进行烧结和多晶硅铸锭,利用扫描电子显微镜分析铸锭前后涂层形貌、X射线衍射分析仪分析铸锭前后涂层物相、少子寿命测试仪检测硅锭少子寿命以及红区长度... 采用喷涂法分别制备以α-Si_3N_4粉和β-Si_3N_4粉为原料的坩埚内壁用氮化硅涂层,进行烧结和多晶硅铸锭,利用扫描电子显微镜分析铸锭前后涂层形貌、X射线衍射分析仪分析铸锭前后涂层物相、少子寿命测试仪检测硅锭少子寿命以及红区长度等。结果表明:与α-Si_3N_4涂层相比,β-Si_3N_4涂层铸锭后高温稳定性强,与石英坩埚结合牢固,几乎无脱落现象。铸锭后α-Si_3N_4涂层颗粒呈类球形、竖直堆垛于坩埚表面,而β-Si_3N_4涂层颗粒呈六方短柱体、平行叠加于坩埚表面,恰好垂直于杂质扩散方向,故更有利于阻挡杂质的扩散。在不显著影响少子寿命的基础上,β-Si_3N_4涂层坩埚铸成的硅锭边缘红区更短、成品率更高。 展开更多
关键词 β-si3N4涂层 相转变 少子寿命 边缘红区 抗脱落性能
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钼表面(Mo,W)Si_2-Si_3N_4复合涂层的低温氧化行为研究 被引量:4
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作者 张厚安 吴艺辉 +2 位作者 古思勇 林佳 庄树新 《厦门理工学院学报》 2013年第3期1-4,共4页
采用包渗法在钼表面原位制备了(Mo,W)Si2-Si3N4复合涂层,考察了其在大气中于500℃和600℃等温循环的氧化性能,利用XRD和SEM等研究了其组织形貌.结果表明:(Mo,W)Si2-Si3N4涂层具有良好的低温抗氧化性,其在空气中500℃和600℃氧化480 h的... 采用包渗法在钼表面原位制备了(Mo,W)Si2-Si3N4复合涂层,考察了其在大气中于500℃和600℃等温循环的氧化性能,利用XRD和SEM等研究了其组织形貌.结果表明:(Mo,W)Si2-Si3N4涂层具有良好的低温抗氧化性,其在空气中500℃和600℃氧化480 h的氧化速率分别为0.0145 g/(m2·h)和0.0191 g/(m2·h),归因于涂层氧化表面形成了致密的SiO2膜. 展开更多
关键词 (Mo W)Si2-si3N4涂层 低温氧化
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AlPO_4-Si_3N_4溶胶-凝胶涂层对氮化物复合材料表面改性的研究 被引量:2
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作者 廖荣 于志勇 +2 位作者 王重海 刘建 袁维军 《现代技术陶瓷》 CAS 2009年第4期11-13,共3页
采用溶胶-凝胶法,对精加工的氮化物复合材料进行AlPO4-Si3N4涂层处理后,表面非常致密,可防止基体因长期放置而吸潮。由于AlPO4-Si3N4溶胶-凝胶有效地弥合基体表面的微裂纹,且浸入到基体内部约34μm深,与基体形成交叉咬合,使材料整体性... 采用溶胶-凝胶法,对精加工的氮化物复合材料进行AlPO4-Si3N4涂层处理后,表面非常致密,可防止基体因长期放置而吸潮。由于AlPO4-Si3N4溶胶-凝胶有效地弥合基体表面的微裂纹,且浸入到基体内部约34μm深,与基体形成交叉咬合,使材料整体性能增加。材料表面改性实验表明,Al-PO4-Si3N4溶胶-凝胶涂层处理后,材料密度增加,表面气孔率降低,强度由原来的60MPa增加为85MPa,断裂韧性由1.1MPam1/2增加为1.9MPam1/2。 展开更多
关键词 溶胶-凝胶法 氮化物复合材料 AlPO4-si3N4涂层
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Electrochemical corrosion behavior of arc sprayed Al-Zn-Si-RE coatings on mild steel in 3.5% NaCl solution 被引量:6
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作者 蒋穹 缪强 +4 位作者 仝飞 徐一 任蓓蕾 刘志梅 姚正军 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第8期2713-2722,共10页
Al-Zn-Si-RE coating with high Al content was deposited on mild steel by arc spraying. The electrochemical behavior of Al-Zn-Si-RE coating in 3.5%NaCl solution was systematically studied by potentiodynamic polarization... Al-Zn-Si-RE coating with high Al content was deposited on mild steel by arc spraying. The electrochemical behavior of Al-Zn-Si-RE coating in 3.5%NaCl solution was systematically studied by potentiodynamic polarization, corrosion potential (φcor ) and electrochemical impedance spectroscopy techniques (EIS). The impedance data were fitted to appropriate equivalent circuits to explain the different electrochemical processes occurring at the electrode-electrolyte interface. The results indicate that Al-Zn-Si-RE coating reveals the similar polarization behavior as Zn-15Al coating. The coating has no passive region in the anodic polarization, but far lower corrosion current and much higher corrosion potential. Al-Zn-Si-RE coating provides effective sacrificial protection for steel substrate and the sacrificial anodic protection plays dominant role during the immersion process. In addition, theφcor evolution and EIS plots indicate that the corrosion process can be divided into five stages: pitting-dissolution-redeposition, activation corrosion, cathodic protection, physical barriers and the coating failure. 展开更多
关键词 Al-Zn-si-RE coating corrosion potential corrosion behavior polarization plots electrochemical impedance spectroscopy
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Effects of Cr interlayer on mechanical and tribological properties of Cr-Al-Si-N nanocomposite coating 被引量:6
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作者 Young Su HONG Se Hun KWON +3 位作者 Tiegang WANG Doo-In KIM Jihwan CHOI Kwang Ho KIM 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第A01期62-67,共6页
Cr-A1-Si-N coatings were deposited on SUS 304 substrate by a hybrid coating system. A Cr interlayer was introduced between Cr-A1-Si-N coating and SUS 304 substrate to improve the coating adherence. The effects of Cr i... Cr-A1-Si-N coatings were deposited on SUS 304 substrate by a hybrid coating system. A Cr interlayer was introduced between Cr-A1-Si-N coating and SUS 304 substrate to improve the coating adherence. The effects of Cr interlayer on the microhardness, adhesion, and tribological behavior of Cr-A1-Si-N coatings were systematically investigated. The results indicate that the microhardness of the Cr-A1-Si-N coatings gradually deceases with increasing thickness of Cr interlayers. The adhesion between Cr-A1-Si-N and SUS 304 substrate is improved by addition of the Cr interlayers. A peak critical load of-50 N is observed for the coating containing Cr interlayer of 60 nm as compared - 20 N for the coating without Cr interlayer. The thicker Cr interlayers result in reduced critical load values. Moreover, the wear resistance of the Cr-AI-Si-N coatings is greatly enhanced by introducing the Cr interlayer with thickness of 60 nm in spite of the decreased microhardness. The friction coefficient of the coating system is also moderately reduced. 展开更多
关键词 Cr-A1-si-N coating Cr interlayer HARDNESS ADHESION wear
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超音速微粒沉积的颗粒连续沉积过程及模拟研究 被引量:1
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作者 周超极 任智强 +2 位作者 王晓明 朱胜 王启伟 《表面技术》 EI CAS CSCD 北大核心 2015年第7期1-5,39,共6页
目的研究超音速微粒沉积过程中,不同颗粒的沉积状态以及后续颗粒的夯实作用对涂层沉积的影响规律。方法采用显式非线性有限元软件LS-DYNA模拟单层颗粒与基体的碰撞,采用自动二维单面接触ASS2D(Automatic 2-D single surface contact)求... 目的研究超音速微粒沉积过程中,不同颗粒的沉积状态以及后续颗粒的夯实作用对涂层沉积的影响规律。方法采用显式非线性有限元软件LS-DYNA模拟单层颗粒与基体的碰撞,采用自动二维单面接触ASS2D(Automatic 2-D single surface contact)求解接触过程,研究超音速微粒沉积中多颗粒沉积行为、后续颗粒碰撞对涂层成形的影响规律。采用超音速微粒沉积技术在铝合金表面制备Al-Si涂层,通过扫描电子显微镜(SEM)分析涂层的表面/截面形貌,进而验证模型的可靠性。结果多颗粒沉积过程中,颗粒与颗粒之间相互嵌合,形成互锁效应,有利于提高涂层的结合强度。后续颗粒对先沉积颗粒具有夯实作用,夯实作用使颗粒扁平化程度加大,同时使颗粒之间紧密结合,存在夯实作用的颗粒压缩率提高至3倍以上,有效避免了涂层孔隙和裂纹的形成。通过观察所制备的Al-Si涂层的表面/截面形貌,证明模型具有可靠性。结论采用数值模拟方法探讨超音速微粒沉积多颗粒在基体上的变形行为,可为超音速微粒沉积的应用提供理论依据。 展开更多
关键词 超音速微粒沉积 沉积模拟 A -si涂层 颗粒碰撞 夯实作用
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High temperature oxidation behavior of Ti(Al,Si)_3 diffusion coating on γ-TiAl by cold spray 被引量:5
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作者 王吉强 孔令艳 +1 位作者 李铁藩 熊天英 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第4期1155-1162,共8页
A Ti(Al,Si)3 diffusion coating was prepared on γ-TiAl alloy by cold sprayed Al?20Si alloy coating, followed by a heat-treatment. The isothermal and cyclic oxidation tests were conducted at 900 °C for 1000 h and ... A Ti(Al,Si)3 diffusion coating was prepared on γ-TiAl alloy by cold sprayed Al?20Si alloy coating, followed by a heat-treatment. The isothermal and cyclic oxidation tests were conducted at 900 °C for 1000 h and 120 cycles to check the oxidation resistance of the coating. The microstructure and phase transformation of the coating before and after the oxidation were studied by SEM, XRD and EPMA. The results indicate that the diffusion coating shows good oxidation resistance. The mass gain of the diffusion coating is only a quarter of that of bare alloy. After oxidation, the diffusion coating is degraded into three layers: an inner TiAl2 layer, a two-phase intermediate layer composed of a Ti(Al,Si)3 matrix and Si-rich precipitates, and a porous layer because of the inter-diffusion between the coating and substrate. 展开更多
关键词 Ti(Al Si)_3 diffusion coating γ-TiAl alloy cold spray heat-treatment high temperature oxidation
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AlPO4-Si3N4溶胶-凝胶涂层对氮化物复合材料表面改性的研究(英文)
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作者 廖荣 王重海 +2 位作者 刘建 王洪升 韦其红 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2012年第S3期316-318,共3页
采用溶胶-凝胶法,对精加工的氮化物复合材料进行AlPO_4-Si_3N_4涂层处理后,表面非常致密,可防止基体因长期放置而吸潮。由于AlPO_4-Si_3N_4溶胶-凝胶能有效地弥合基体表面的微裂纹,且浸入到基体内部约34μm深,与基体形成交叉咬合,使材... 采用溶胶-凝胶法,对精加工的氮化物复合材料进行AlPO_4-Si_3N_4涂层处理后,表面非常致密,可防止基体因长期放置而吸潮。由于AlPO_4-Si_3N_4溶胶-凝胶能有效地弥合基体表面的微裂纹,且浸入到基体内部约34μm深,与基体形成交叉咬合,使材料整体性能提高。A1PO_4-Si_3N_4溶胶-凝胶涂层处理后,材料密度增加,表面气孔率降低,强度由60 MPa增加为85 MPa,断裂韧性由1.1MPa.m^(1/2)增加为1.9MPa.m^(1/2)。 展开更多
关键词 溶胶-凝胶法 氮化物复合材料 AlPO4-si3N4涂层
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Influence of heating parameters on properties of the Al-Si coating applied to hot stamping 被引量:8
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作者 LIANG WeiKang TAO WenJie +1 位作者 ZHU Bin ZHANG YiSheng 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2017年第7期1088-1102,共15页
The Al-Si coating of ultra-high strength steel has been applied to hot stamping more and more widely, owing to solving the problem of oxidation and decarburization. However, the evolution of Al-Si coating during the h... The Al-Si coating of ultra-high strength steel has been applied to hot stamping more and more widely, owing to solving the problem of oxidation and decarburization. However, the evolution of Al-Si coating during the heating process was rarely studied in the previous study. The tests about the influence of heating parameters, such as heating temperature, heating rates and dwell time, on properties of the Al-Si coating were carried out on the Gleeble-3500 thermal simulator. The properties of the Al-Si coating, for instance, volume fraction of FeAl intermetallics, α-Fe layer as well as porosity and 3D surface topography, were explored in the study. Results showed that more and more Kirkendall voids and cracks appeared in the Al-Si coating when the heating temperature exceeded 600°C. The heating rates almost had no influence on properties of the Al-Si coating when the temperature was equal to or lower than 500°C. The volume fraction of FeAl intermetallics in the coating with dwell time from 3 s to 8 min at 930°C was0, 6.19%, 17.03% and 20.65%, separately. The volume fraction of the α-Fe layer in the coating changed from zero to 31.52%with the prolonged dwell time. The porosity of the coating ranged from 0.51% to 4.98% with the extension of dwell time. The unsmooth degree of the surface of the coating rose gradually with the increasing of heating rates and the extension of dwell time.The 3D surface topography of the coating was determined by the comprehensive effect of atoms diffusion, new formed phases,surface tension and the degree of oxidation of the coating surface. Experiments indicated that rapid heating was not suitable for the coating when the temperature exceeded 500°C. Experiments also demonstrated that enough dwell time was essential to obtain the superior properties of the coating. 展开更多
关键词 Al-si coating heating parameters thermal simulator Kirkendall voids cracks 3D surface topography
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