共查询到16条相似文献,搜索用时 46 毫秒
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用溅射方法获得了晶粒尺寸小于 0.5μm的微晶Co-30Cr-5Al涂层,并对正常晶粒的CoCrAl合金及其微晶溅射层的1000℃抗循环氧化性能进行了研究。用扫描电镜和声发射技术研究了微晶化对CoCrAl合金表面氧化膜粘附性的影响。结果表明:正常晶粒的 CoCrAl合金经1次循环氧化,初生氧化膜即出现剥落,继而表面生成了氧化铬,而氧化铬的保护性远比氧化铝差;而微晶 CoCrAl涂层经100次循环,表面氧化铝膜仍完好无损。声发射测量结果表明,微晶涂层比正常晶粒的合金具有更高的抗表面氧化膜剥落的能力。 相似文献
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溅射微晶CoCrAl涂层的抗循环氧化性能 总被引:3,自引:0,他引:3
用溅射方法获得了晶粒尺寸小于 0.5μm的微晶Co-30Cr-5Al涂层,并对正常晶粒的CoCrAl合金及其微晶溅射层的1000℃抗循环氧化性能进行了研究。用扫描电镜和声发射技术研究了微晶化对CoCrAl合金表面氧化膜粘附性的影响。结果表明:正常晶粒的 CoCrAl合金经1次循环氧化,初生氧化膜即出现剥落,继而表面生成了氧化铬,而氧化铬的保护性远比氧化铝差;而微晶 CoCrAl涂层经100次循环,表面氧化铝膜仍完好无损。声发射测量结果表明,微晶涂层比正常晶粒的合金具有更高的抗表面氧化膜剥落的能力。 相似文献
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CoCrAl微晶涂层对TiAl金属间化合物抗高温氧化性能的影响 总被引:2,自引:0,他引:2
研究了TiAl金属间化合物及溅射Co—30Cr—5Al微晶涂层对其在900—1000℃下抗氧化性能的影响结果表明,TiAl的氧化动力学近于直线规律,表面形成以TiO_2为主的层状、疏松氧化膜,且氧化膜与基体合金之间粘附性较差,不具保护性而30μm的Co—30Cr—5Al微晶涂层可使TiAl的抗氧化性能大大提高,涂层表面能够形成粘附性良好的Al_2O_3保护膜但由于在氧化过程中,Co向基体扩散,在涂层与基体之间形成大量Kirkendall空洞,这些空洞对TiAl金属间化合物抗氧化性能的影响有待进一步的研究 相似文献
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溅射NiCrAl微晶涂层的氧化行为 总被引:1,自引:0,他引:1
研究了氩气压力对溅射Ni-20Cr-2Al涂层晶粒尺寸及其抗氧化性能的影响.结果表明,随氩气压力的降低涂层的晶粒尺寸减小,当氩气压力降至0.67Pa时,涂层晶粒直径约为65nm,该涂层在1000℃空气中可以形成单一的氧化铝膜,从而大大提高合金的抗氧化性能. 相似文献
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提出了一种以脉冲电源两极作为沉积电极 ,以被处理试样作为感应电极 ,发生串联脉冲放电沉积金属涂层的新技术。通过“针—板—针”电极放电实验证实了上述串联脉冲放电过程。采用改进的双极串联电脉冲沉积设备在 1Cr18Ni8不锈钢基体上沉积了 1Cr18Ni8微晶涂层和弥散Y2 O3 微小颗粒的 1Cr18Ni8微晶涂层。在 95 0℃空气中进行的高温氧化实验结果表明 ,获得的 1Cr18Ni8微晶涂层极大地提高了抗高温氧化性能 ,同时还证实在微晶涂层中施加微小弥散Y2 O3 颗粒有助于进一步降低涂层的氧化速率及提高氧化膜的抗剥落性能 相似文献
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溅射LDZ125微晶涂层抗高温氧化行为 总被引:8,自引:0,他引:8
研究了镍基高温合金LDZ125溅射微晶涂层的氧化行为。微晶涂层仅由γ相组成,晶粒尺寸小于100nm。微晶涂层在1000℃的抗氧化性能比由γ,γ‘及碳化物组成的铸态合金有明显提高。 相似文献
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LDZ125微晶涂层抗循环氧化性能 总被引:2,自引:1,他引:1
研究了高温合金LDZ125及其溅射微晶涂层的抗循环氧化行为.微晶涂层仅由γ相组成,晶粒尺寸约为30nm.结果表明:微晶涂层在1000℃的抗循环氧化性能比铸态合金的有极大提高.微晶层氧化时只形成单一的Al2O3氧化膜,且在整个氧化过程中未见开裂剥落,有极好的粘附性. 相似文献
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The oxidation mechanisms of sputtered microcrystalline Co–30Cr–5Al coatings were investigated by an acoustic emission technique, scatch test, transmission electron microscope (TEM), which was compared with CoCrAlY alloy. The results indicated that the beneficial effects of microcrystallization on the scale adhesion of Co–30Cr–5Al alloy are as follows: (1) The sputtered CoCrAl coating possesses a columnar structure, and oxidation along the columnar grains may form many micropegs which can anchor the scale to the metallic substrate, enhancing bonding of the scale. (2) The grain size of the sputtered coating is several orders of magnitude smaller than that of the cast alloy, and the grain size of oxide scales formed on the former is finer than that of the latter. The finer oxide scale may relieve the growth stresses during isothermal oxidation and partial thermal stresses during cooling by plastic deformation through grain sliding. The microcrystalline coating is more plastic than the cast alloy, which may relieve a certain amount of thermal stresses of the oxide scales. On the basis of oxide adhesion and plasticity, microcrystallization is more beneficial than the addition of reactive elements. 相似文献
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WANG Fuhui LOU Hanyi WU Weitao Corrosion Science Laboratory Institute of Corrosion Protection of Metals Academia Sinica Shenyang China Research Assistant Institute of Corrosion Protection of Metals Academia Sinica Shenyang China 《金属学报(英文版)》1992,5(9):173-177
An investigation was carried out of the resistance to cyclic oxidation of the as-castnormal-grained Co-30Cr-5Al alloy substrate at 1000℃ in air together with its sputteredcoating of microcrystallized CoCrAl alloy grains sized less than 0.5μm.Acoustie emissi oncounts showed that the initially formed Al_2O_3 scale on the bare alloy substrate cracked andspalled severely off after only one or two cycles on cooling and then the worse protective layerof Cr_2O_3 and CoCr_2O_4 spinel occurred on surface.While such substrate coated withsputtered microcrystallized CoCrAl alloy film was not damaged under oxidation even through100 cycles at 1000℃.In comparison with the normal-grained alloy,the microcrystallized al-loy,coating of similar constitution exhibite excellent resistance to oxide spalling on surface. 相似文献
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两种电弧离子镀Ni-Co-Cr-Al-Si-Y涂层的高温氧化行为 总被引:1,自引:0,他引:1
采用电弧离子镀技术在镍基高温合金DD32上制备了两种不同Cr和Al含量的Ni-Co-Cr-Al-Si-Y涂层,分析了两种涂层的组织及结构,对比研究了两种涂层分别在1000和1100℃时的静态氧化行为和从1000℃到室温的循环氧化行为.结果表明:退火后两种涂层均由γ'/γ,β-NiAl以及少量α-Cr析出相组成,但Al含量高的Ni-Co-Cr-Al-Si-Y涂层含更多的β相.氧化过程中由于高Al涂层具有较多的Al储存相,在恒温氧化时能有效修复被破坏的氧化膜,在循环氧化时氧化膜不易开裂和剥落,在长时间氧化后仍能保持较高的Al含量,使得涂层能抵抗更长时间的高温氧化. 相似文献
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采用等离子喷涂工艺在高锰铝青铜基体上制备了 Al2O3-13%TiO2和Cr2O3·5SiO2·3TiO2两种耐冲蚀复合涂层,利用扫描电子显微镜(SEM)、激光扫描显微镜(LSM)等手段观察分析了两种涂层的组织形貌,测试了两种涂层的显微硬度和结合强度,用电化学测量和失重测量分别研究了两种涂层在3.5%NaCl溶液中的电... 相似文献
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WANG Fuhui LOU Hanyi WU Weitao Corrosion Science Laboratory Institute of Corrosion Protection of Metals Academia Sinica Shenyang China associate professor Institute of Corrosion Protection of Metals Academia Sinica Shenyang China 《金属学报(英文版)》1993,6(11):331-336
Effect of a sputtered Co-30Cr-5Al microcrystalline coating on oxidation resistance ofintermetallic compound TiAl and oxidation behavior of the bare TiAl were investigatedat 900—1000℃ in static air.The oxidation kinetics for the TiAl alloy seems toapproximately follow a linear rate law.Poor oxidation resistance of TiAl is due to theformation of the mixed Al_2O_3+TiO_2 scale which is loosely packed and easily spalledoff.but not of dense and adherent pure Al_2O_3.A sputtered Co-30Cr-5Al coating,30μm thickness,can remarkably improve the oxidation resistance of TiAl owing to theformation of adherent Al_2O_3 protective scale.However,many Kirkendall voids wereformed between coating and substrate. 相似文献
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NiAl微晶涂层对NiAl-TiC复合材料高温氧化性能的影响 总被引:3,自引:0,他引:3
研究了磁控溅射NiAl微晶涂层对NiAl-TiC(20%,体积分数)复合材料1000-1100℃高温氧化性能的影响。结果表明,NiAl微晶涂层大大提高了NiAl-TiC复合材料的恒温及循环氧化性能,降低氧化速率几个数量级,对于NiAl-TiC复合材料来说,其表面形成以TiO2为主的复合氧化物,而施加NiAl微晶涂层后,其表面氧化物主要是Al2O3。 相似文献