共查询到20条相似文献,搜索用时 109 毫秒
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研究了化学成分及训练对铁锰硅铬镍合金形状记忆效应的影响,并测试了合金的抗蠕变性能和耐腐蚀性能。结果表明,Fe14Mn6Si9Cr5Ni合金具有较好的形状记忆效应以及较好的抗蠕变性能、耐碱性腐蚀性能和耐晶间腐蚀性能。训练可提高相对应变回复率30%~50%(在εP=4%~9%)。绝对应变回复率可达62%。 相似文献
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微晶WCNi合金的机械性能日本千页工艺研究所工程部研究了由碳化物粘结的微晶WCNi合金的机械性能。他们将添加10wt%VC作粘结剂的微晶WC10wt%Ni中间合金在1450~1500℃于真空中烧结,原料WC粉粒径为07~14μm。主要研究了... 相似文献
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Effect of Rare Earths on the Wear Resistance and High Temperature Oxidation Resistance of H13 Steel Surface-Treated with S-N-C Co-diffusion 总被引:1,自引:0,他引:1
Hu Zhengqian 《中国稀土学报(英文版)》1998,16(3):227-230
SteelH13isacommonlyusedhotworkingdiesteel,whichchemicalcompositionisgivenasfolows:C:032~045,Si:080~120,Mn:020~050,Cr:4... 相似文献
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草酸盐共沉淀法制取优质锰锌铁氧体微细粉末的热力学分析 总被引:10,自引:0,他引:10
对草酸盐共沉淀法制取锰锌铁氧体软磁材料粉末的FeSO4ZnSO4MnSO4(NH4)2C2O4H2O体系进行热力学分析,得出最佳pH为40~82,热力学计算与试验吻合。草酸盐共沉淀粉末煅烧后平均粒径220μm,烧结温度比普通干法制粉低40℃左右,制得的温敏锰锌铁氧体材料起始磁导率达4550左右,温度灵敏度≤15℃,并在磁性温敏传感器中应用效果良好 相似文献
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报导 2 ,3 ,7三 羟 基9莰 烯 基6荧 光 酮( 简称 C A F) 的 合成 及 其光 度 法 测定合金钢 中 Ti( Ⅳ) 含量。 结果表明 ,在酸性 介质 中, Ti( Ⅳ) C A F Triton X100 形 成1∶1∶1 三元 络 合物。最大 吸收波长 为562 n m ,摩尔 吸光系数75 ×104 L·mol - 1·cm - 1 , Ti( Ⅳ) 浓度 在0 ~10μg/25 m L 内符合比尔定 律。方法 用于合 金钢中钛 的测定。 相似文献
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NMRStudiesonEuandLaComplexeswithPyridine2,6DicarboxylicAcidandPhenYangQiuqing(杨秋青)(ExperimentalCenter,HebeiNormalUniversity... 相似文献
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以1亚硝基2萘酚为萃取剂,以90℃熔融萘作稀释剂萃取痕量钯(Ⅱ),萘相中钯经氯仿溶解后用光度法测定其含量。实验条件下络合物能从pH=0.8~110范围内定量萃入萘中,络合物波长λmax=440nm,摩尔吸光系数ε440=241×104L·mol-1·cm-1,组成比Pd∶HR=1∶2,萃取反应平衡常数Kex=631×1011。钯量在048~34μg/10ml范围内符合朗伯比耳定律,检测限为0044μg/10ml。同时确定了光度法测定的最佳条件及常见阴阳离子的干扰允许量。利用该法进行合成样与实际样中钯含量的测定,结果满意。 相似文献
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In this work, the porosity in a iron-based oxide dispersion-strengthened (ODS) alloy, namely, PM2000, has been studied together
with its recrystallization behavior. It has been found that pores are only found in coarse secondary recrystallized grains
formed at the early stage of recrystallization. It is suggested that a lack of fast diffusion paths, particularly grain boundaries,
will prevent gas trapped in the materials during mechanical alloying (MA) from diffusing away, and porosity is formed as a
result. Thus, it is proposed that an extended anneal below the secondary recrystallization temperature will help to reduce
the subsequent evolution of porosity in these materials, and the method has been demonstrated to work successfully in PM2000. 相似文献
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烧结钎焊粉末冶金零件研究 总被引:1,自引:0,他引:1
烧结钎焊是一种已确立的粉末冶金零件连接工艺,经常用于生产汽车零部件。成功的钎焊连接主要取决于钎焊合金、连接表面与烧结气氛间的相互作用。将广泛使用的钎焊合金,Ancorbraze 72(AB 72),设计成与焊接的母体材料形成合金和能局部密封钢粉末冶金零件的表面孔隙,从而可防止因熔渗造成钎料材料的大量损失。本文将检验在不同生产工艺条件下钎焊的性状,和研究与表征焊剂与铁使钎焊合金的改性对熔化与凝固性状的影响。 相似文献
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1990年以来全球粉末冶金机械零件工业发展动向 总被引:5,自引:1,他引:4
概述了进入90年代以来全球钢铁粉末、铜粉及粉末冶金机械零件的发展动向,指出汽车工业的高度发展和粉末冶金新产品新材料的研制与开发是粉末冶金零件市场迅速扩大的根本原因。作者同时分析了当前粉末冶金零件生产集团化和国际化的发展趋势,并认为在这种形势下我国粉末冶金行业应在产品的营销、新品开发、技术改进及质量保证等方面进行全球性的思考。文章最后介绍了当前值得注意的一些技术的发展动向。 相似文献
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刘沙 《稀有金属与硬质合金》1997,(4):26-29
研究了用粉末冶金法制取Mo-3%Re合金的工艺.结果表明.粉末冶金法可以制得性能良好的Mo-3%Re合金.在混和料的制备中采用湿混或干湿混合.有利于Re的均匀分布;且3%Re的加入,可大大细化钼合金的晶粒. 相似文献
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《粉末冶金学》2013,56(3):366-375
AbstractThe growing field of aluminium powder metallurgy (PM) brings promise to an economical and environmental demand for the production of high strength, light weight aluminium engine components. In an effort to further enhance the mechanical properties of these alloys, the effects of hot upset forging sintered compacts were studied. This article details findings on the hot compression response of these alloys, modelling of this flow behaviour, and its effects on final density and microstructure. Two aluminium–silicon based PM alloys were used for comparison. One alloy was a hypereutectic blend known as Alumix-231 (Al–15Si–2·5Cu–0·5Mg) and the second was an experimental hypoeutectic system (Al–6Si–4·5Cu–0·5Mg). Using a Gleeble 1500D thermomechanical simulator, sintered cylinders of the alloys were upset forged at various temperatures and strain rates, and the resulting stress–strain trends were studied. The constitutive equations of hot deformation were used to model peak flow stresses for each alloy when forged between 360 and 480°C, using strain rates of 0·005–5·0 s?1. Both alloys benefited from hot deformation within the ranges studied. The experimental alloy achieved an average density of 99·6% (±0·2%) while the commercial alloy achieved 98·3% (±0·6%) of its theoretical density. It was found that the experimentally obtained peak flow stresses for each material studied could be very closely approximated using the semi-empirical Zener–Hollomon models. 相似文献
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《粉末冶金学》2013,56(3):188-190
AbstractR&;D efforts at CSIRO, Australia, into the production of ‘lower cost’ titanium powders are complemented by a strong, downstream PM programme. One of these efforts has focused on the direct powder rolling of commercially pure (cp) titanium powder with a view to the continuous production of fully dense strip. Considerable research is also being undertaken to produce titanium alloy strip, initially from the Ti–6Al–4V alloy, using this process. An experimental design approach has been employed to establish key parameters, maximise the process window and meet property specifications. Demonstration of a proof-of-system at pilot scale is well advanced and the focus is now shifting to seeking industrial engagement with a view to collaboration, technology transfer and commercialisation of the technology. The current status of the technology is surveyed including aspects of the associated market trends and commercial feasibility. 相似文献
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海军航空装备的快速发展导致飞机必将面临更为严峻的海洋大气腐蚀问题,而军用飞机紧固件的腐蚀,尤其电偶腐蚀将严重影响飞机结构的安全性水平.因此,本文采用盐雾腐蚀模拟、扫描电镜观察与分析、电化学测试分析(自腐蚀电位测试、动电位极化测试、电偶腐蚀电流测试)等试验研究方法,将航空装备常用的30CrMnSiA镀镉钝化螺栓与三种不同螺母(30CrMnSiA镀镉钝化螺母、30CrMnSiA镀锌钝化螺母和0Cr16Ni6钝化螺母)偶接装配,研究由于装配导致的电偶腐蚀效应对典型螺栓/螺母紧固件腐蚀行为的影响.结果表明,在三种不同组合装配中,30CrMnSiA镀镉钝化螺栓与0Cr16Ni6钝化螺母之间电位差最大,电偶腐蚀电流密度最高,对应螺栓电偶腐蚀敏感性评级达到E级,电偶腐蚀作用促进了镀镉钝化螺栓基体表面点蚀的扩展,腐蚀进程被加速,加速系数AF达到3.4;30CrMnSiA镀镉钝化螺栓与30CrMnSiA镀锌钝化螺母之间电偶效应则较弱,且螺母为电偶腐蚀阳极,腐蚀进程被加速,加速系数AF为1.2,电偶腐蚀敏感性评级为D级;相比上述两种组合,30CrMnSiA镀镉钝化螺栓与30CrMnSiA镀镉钝化螺母之间电偶效应最不明显,对应电偶腐蚀敏感性评级为A级. 相似文献
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采用超声气体雾化法制备洁净的TiAl预合金粉末,再经粉末除气、封装、热等静压致密化等工序获得TiAl基合金热轧板坯,之后包覆热轧制备粉末冶金TiAl基合金板材。轧制过程中材料的应变、应力状态、温度场分布非常复杂,本实验采用Gleeble热模拟试验机和有限元(FEM)模拟相结合,确定热加工工艺窗口,优选出热轧工艺参数,并热轧得到组织均匀、性能良好、尺寸为220mm×370mm×2mm的粉末冶金TiAl基合金板材。板材室温拉伸性能Rp0.2为608MPa,Rm为668MPa,A为2.56%;1000℃拉伸性能只眦为163MPa,Rm为330MPa,A为32.0%;焊接成形性良好,焊缝无缺陷及二次裂纹产生,焊缝区域显微组织与基体差别不大。 相似文献
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