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《稀有金属材料与工程》1989,(4)
含38%银、28%钡和15%铕的铜合金可以浇注成小于100微米厚的细丝和薄带。在900℃下经空气氧化和380℃20小时通氧再氧化,形成转变温度为85K的铜化合物,它呈银固溶体枝晶结构。 相似文献
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K4104合金渗Al-Si涂层抗高温氧化性能研究 总被引:1,自引:0,他引:1
采用无机盐料浆法,在K4104镍基高温合金表面制备Al-Si涂层通过改变粘结剂中CrO3的含量得到两种不同成分的Al-Si涂层.依据HB5258-2000标准,对制备了Al-Si涂层的K4104镍基高温合金进行了高温氧化性能试验.绘制了氧化动力学曲线,用带能谱分析的扫描电镜观察了涂层的表面氧化形貌和横截面组织形貌.结果表明,K4104镍基高温合金表面的Al-Si涂层在高温氧化过程中已转变成完整致密的α-Al2O3氧化层和β-NiAl相化合物层,且与基体合金的粘附性良好,说明Al-Si涂层具有优良的抗高温氧化性能. 相似文献
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《稀有金属材料与工程》2016,(10)
为了获得BFe10-1-2白铜合金的合理热变形工艺参数,通过热模拟压缩试验对该合金的高温变形行为进行了研究。试验温度为1023~1273 K,应变速率为0.001~10 s-1。通过流变曲线分析、动力学分析及加工图对BFe10-1-2白铜合金的高温变形行为进行了表征,计算出BFe10-1-2白铜合金在热压缩变形过程中的激活能为425.299 k J/mol。通过Zener-Holloman参数以及真应变建立了BFe10-1-2白铜合金的本构方程用以描述该合金的高温流动应力。对计算的流动应力值与试验值进行了对比,结果表明:本构方程可以准确描述该合金的高温流动行为。此外,基于动态模型,建立了BFe10-1-2白铜合金的热加工图,并通过宏观及微观组织分析对加工图的准确性进行了验证。 相似文献
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通过氧化膜剥落实验发现,在相同条件下,EFTEC64T和C194两种材料的氧化膜与基底结合强度较高,不易剥离,而C5191和C7025两种材料则较差.通过AES对各铜合金材料氧化膜进一步的分析表明:铜合金材料氧化膜基本结构为CuO/Cu2O/Cu,且氧化膜的结合强度与CuO成分在氧化膜中所占比例有关,比例愈高则越易剥落.研究还发现:在氧化过程中,铜合金的某些微量元素会在氧化膜与基底的界面上发生富集偏析,这是导致氧化膜结合强度减弱的主要原因. 相似文献
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通过氧化膜剥落实验发现,在相同条件下,EFTEC64T和C194两种材料的氧化膜与基底结合强度较高,不易剥离,而C5191和C7025两种材料则较差.通过AES对各铜合金材料氧化膜进一步的分析表明铜合金材料氧化膜基本结构为CuO/Cu2O/Cu,且氧化膜的结合强度与CuO成分在氧化膜中所占比例有关,比例愈高则越易剥落.研究还发现在氧化过程中,铜合金的某些微量元素会在氧化膜与基底的界面上发生富集偏析,这是导致氧化膜结合强度减弱的主要原因. 相似文献
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采用静态恒温氧化增质法测定了镍基高温合金K424在600~800℃温度范围内的氧化动力学曲线.结果表明,氧化动力学曲线遵循抛物线规律.EDXS分析表明,K424合金氧化膜的主要成分是Ni和Al的氧化物,此外还有少量Cr,Ti的氧化物.通过SR5000光谱辐射计量仪测量合金的红外发射率.结果表明,合金的表面状态、氧化时间,氧化温度对红外发射率均有较大影响. 相似文献
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蔡军 《稀有金属材料与工程》2016,45(10):2549-2554
为了获得BFe10-1-2白铜合金的合理热变形工艺参数,通过热模拟压缩试验对该合金的高温变形行为进行了研究。试验温度为1023~1273K,应变速率为0.001~10s-1。通过流变曲线分析、动力学分析及加工图对BFe10-1-2白铜合金的高温变形行为进行了表征,计算出BFe10-1-2白铜合金在热压缩变形过程中的激活能为425.299KJ/mol。通过Zener-Holloman参数以及真应变建立了BFe10-1-2白铜合金的本构方程用以描述该合金的高温流动应力。对计算的流动应力值与试验值进行了对比,结果表明:本构方程可以准确描述该合金的高温流动行为。此外,基于动态模型,建立了BFe10-1-2白铜合金的热加工图,并通过宏观及微观组织分析对加工图的准确性进行了验证。 相似文献
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介绍了金银钯铂铜合金系列的成分、组织、性能及其应用研究。其综合性能优于国内外同类材料,等体积材料的成本低于同类材料的40~80%。该系列合金适用于航空、航天和航海技术中的各类线绕传感器、电位器,电阻器的绕组和电刷以及电接触器的接点、导电环和电刷。 相似文献
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我国钛及钛合金研发与进展 总被引:1,自引:0,他引:1
我国材料工作者对不同领域使用的钛合金进行了卓有成效的研究工作。经过近50年的发展,我国的钛工业在科技和生产上都取得了长足进步。概述了我国自主研发的各种钛及钛合材料,包括高温钛合金、高强钛合金、低温钛合金、耐蚀钛合金、船用钛合金、医用钛合金等。最后对我国钛工业进行了简要的展望。 相似文献
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MICROSTRUCTURE MODIFICATIONS OF WROUGHT AND CAST TiAl ALLOYS 总被引:3,自引:2,他引:1
《中国有色金属学会会刊》1999,(Z1)
1 INTRODUCTIONGammaTiAlalloyshaveattractedagreatdealofinterestsfromtheaerospaceandautomobileindustriesinChinainthepast5years.AfewTiAlcomponentshavebeenfabricatedbyeithercastingorhotworking.However,therearestillmanytechnicalissueswhichremainasbarri… 相似文献
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. S?derberg J. Keto-Toko J. Anttila V. K. Lindroos J. KetoTokoi 《Journal of Materials Engineering and Performance》1997,6(4):517-520
This paper evaluates the performance and engineering aspects of 44Ti-47Ni-9Nb alloy in a pretensioning washer application.
Previously the behavior of this alloy has mainly been studied for tensile predeformation with wires and strips up to 1 mm
thickness. The present work investigated the effect of compression deformation and different homogenization temperatures on
ring-shaped washers with larger dimensions. The best results with the compression-trained washer were achieved after homogenization
at 1073 K where the compression training deformation was -10.4%, the lowest applied. The deformation training was carried
out at 213 K near the martensitic reaction start temperature of the material. The expansion method, applied to the commercial
reference ring, seemed to be a fairly efficient training method for the studied application, even though the parallel course
of the radial surfaces was poor. 相似文献
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Stability of protective oxide films on Ti-base alloys 总被引:2,自引:0,他引:2
Krishan L. Luthra 《Oxidation of Metals》1991,36(5-6):475-490
Thermodynamic calculations are performed to estimate isothermal sections of Ti-Al-O, Ti-Si-O, and Ni-Al-O phase diagrams. Very small aluminum levels (<10–10 at. %) are needed to stabilize alumina on Ni-Al alloys. However, much higher aluminum (50%) and silicon (40%) levels are needed to stabilize alumina and silica on Ti-Al and Ti-Si alloys, respectively. These calculations suggest that the mechanism of formation of the protective oxide films on titanium-based alloys is radically different from that on nickel-based alloys. The aluminum levels needed to form a continuous film of alumina on nickel-based alloys are dominated by kinetic factors. On the other hand, thermodynamic factors appear to dominate the alloy compositions needed to form protective films of alumina and silica on titanium-based alloys. Further work is needed to evaluate any possible role of kinetic factors. 相似文献
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The corrosion of iron-, nickel-, and cobalt-base alloys has been studied in atmospheres containing carbon and oxygen in the temperature range 894–1366 K. It was observed that preformed Cr2O3 films are not effective barriers to carbon transport in atmospheres in which the oxide is not stable but that stable, growing Cr2O3 films are excellent barriers to carbon penetration. The presence of Fe-containing oxides on Fe-Ni-Cr and Fe-Cr alloys cause the scales to be permeable to carbon. This phenomenon was found to be sensitive to alloy surface preparation. Carbon transport through oxide scales may occur by two mechanisms: diffusion or molecular transport through physical defects. The present work has evidence of the latter but cannot rule out the former in cases where the carbon activity is sufficiently large. In gases containing CO and CO2 in which Cr carbide is stable Cr2O3 was found to form at the carbide-alloy interface by oxygen transport through the carbide. In A-CH4 Fe-Ni-Cr were found to undergo graphitization attack. The results were consistent with the formation and subsequent decomposition of metastable carbides, as proposed by Hochmann. 相似文献
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研究了φ0.1~2.0mm Pd-40Ag-1RE(Sm,Eu,Gd)合金丝在800~1200℃大气气氛下的内氧化行为及其性能,其内氧化深度ξ与反应时间t的关系是ξ=kt~n,在低温下,符合内氧化抛物线规律.随反应时间延长,温度升高,n增大,对此规律偏离越大,三个合金内氧化n=0.5~0.75,Pd-40Ag-1Sm和Pd-40Ag-1Gd晶界局部超前氧化,合金内氧化由体扩散控制. 相似文献