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Cu基体表面PTA工艺制备Ni基耐磨层研究 被引量:4
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作者 李振东 汪瑞军 +3 位作者 李宏 王伟平 史萌 詹华 《热喷涂技术》 2011年第1期17-21,共5页
采用等离子粉末堆焊(PTA)工艺在Cu基体表面制备了Ni基耐磨层,对该耐磨层的微观组织、相结构、元素成分、显微硬度性能及高温耐磨性能等进行了研究。结果表明:耐磨层与基体形成良好的冶金结合,稀释率仅为6%,且其显微组织细小,呈枝状晶形... 采用等离子粉末堆焊(PTA)工艺在Cu基体表面制备了Ni基耐磨层,对该耐磨层的微观组织、相结构、元素成分、显微硬度性能及高温耐磨性能等进行了研究。结果表明:耐磨层与基体形成良好的冶金结合,稀释率仅为6%,且其显微组织细小,呈枝状晶形貌,硬质相呈弥散分布。耐磨层主要由γ相固溶体、Cr23C6、Ni3Fe、和Cr7C3以及少量的硼化物相组成。耐磨层中的碳化物和硼化物的存在使得耐磨层的平均显微硬度365HV,较紫铜基体的平均显微硬度46.4HV提高了近7倍,并且其高温耐磨性能提高了近2倍。 展开更多
关键词 等离子粉末堆焊 cu基体 稀释率 高温耐磨性能
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Cu基体离子镀Al膜的相结构及晶体学位向关系
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作者 王家祥 陈宝清 +3 位作者 王斐杰 王绍庭 郭可訒 黄燕清 《真空》 CAS 北大核心 1990年第4期43-47,共5页
本文用X射线衍射仪和透射电子显微镜研究了 Cu基体离子镀 Al膜的相结构及 晶体学位向关系。 X射线衍射分析结果表明了 Cu-Al过渡层中各合金相的存在并发 现负偏压和极间距是影响合金相形成的主要因素。两者的变化将影响表面温... 本文用X射线衍射仪和透射电子显微镜研究了 Cu基体离子镀 Al膜的相结构及 晶体学位向关系。 X射线衍射分析结果表明了 Cu-Al过渡层中各合金相的存在并发 现负偏压和极间距是影响合金相形成的主要因素。两者的变化将影响表面温度的升高。 每一个Cu-Al合金相图中存在的中间相在Cu基离子镀A1膜的过渡层中的存在都 对应一个温度区间.在极间距一定的情况下,该温度区间对应着负偏压的区间。极间距 加大,该负偏压区间升高。用透射电镜观察了一定工艺参数下的 Cu基离子镀 Al膜, 发现了与X射线分析结果相对应的一系列合金相的存在.它们是,AL_4Cu_9(Complex Cubic),AlCu_3(Orthorhombic),CuA1_2(Primitive Tetragnal), AlCu (Primitive Monoclinie)及AlCu_4(Cubic).观察了合金相的形态并确定了合 金相与基体 Cu及股 Al 间的晶体学位向关系。 展开更多
关键词 镀膜 Al膜 cu基体 相结构 晶体学
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镀铜石墨含量对Fe-25Cu基摩擦材料组织结构及摩擦性能的影响
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作者 付传起 李省君 +1 位作者 黄亚忠 林永威 《表面技术》 EI CAS CSCD 北大核心 2023年第2期245-253,共9页
目的为改善石墨与铜铁基摩擦材料的结合方式,探究不同含量的镀铜石墨对铜铁基摩擦材料组织结构的影响,并研究加入不同含量的镀铜石墨时,摩擦材料的摩擦性能和摩擦机理。方法采用热压烧结法制备Fe-25Cu基摩擦材料,利用扫描电镜、X射线衍... 目的为改善石墨与铜铁基摩擦材料的结合方式,探究不同含量的镀铜石墨对铜铁基摩擦材料组织结构的影响,并研究加入不同含量的镀铜石墨时,摩擦材料的摩擦性能和摩擦机理。方法采用热压烧结法制备Fe-25Cu基摩擦材料,利用扫描电镜、X射线衍射等表征手段进行表征,并利用摩擦磨损试验机测试摩擦材料的摩擦性能,分析摩擦因数。摩擦试验后的材料利用扫描电镜进行表面观测,分析摩擦磨损机理。计算材料摩擦后的磨损量,以此分析镀铜石墨含量对摩擦材料的影响。结果相同转速下随着镀铜石墨含量的增加,平均摩擦因数降低,当镀铜石墨的质量分数为9%时,摩擦因数曲线最平稳;随着镀铜石墨含量的增加,摩擦因数逐渐降低,磨损率先减少后增加。当加入9%的镀铜石墨时,该材料的摩擦性能最好,此时材料的摩擦因数为0.436,磨损率最低为0.023mm;黏着磨损和磨粒磨损是添加镀铜石墨的摩擦材料的主要摩擦机理。结论在Fe-25Cu基摩擦材料中镀铜石墨与基体的结合情况优于石墨与基体的结合,同时加入镀铜石墨Fe-25Cu基摩擦材料的摩擦因数高,磨损量小。 展开更多
关键词 Fe-25cu基体 石墨 镀铜石墨 摩擦因数 磨损率
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Al含量对Cu基Ni镀层表面渗Si层组织和力学性能的影响 被引量:4
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作者 王红星 李迎光 《材料工程》 EI CAS CSCD 北大核心 2010年第2期52-57,共6页
采用料浆包渗法,以SiO2粉为Si源,纯Al粉为还原剂,NaF和NH4Cl作为复合活化剂,Al2O3为惰性添加剂,蛋白质(鸡蛋清)为黏结剂,在Cu表面预先镀Ni层随后900℃,12h表面渗Si,制备渗Ni-Si层。研究了Al粉含量对渗Si层组织和力学性能的影响。结果表... 采用料浆包渗法,以SiO2粉为Si源,纯Al粉为还原剂,NaF和NH4Cl作为复合活化剂,Al2O3为惰性添加剂,蛋白质(鸡蛋清)为黏结剂,在Cu表面预先镀Ni层随后900℃,12h表面渗Si,制备渗Ni-Si层。研究了Al粉含量对渗Si层组织和力学性能的影响。结果表明:随铝粉含量的增加,渗层组织出现以下转变:Ni3Si+Ni31Si12→Ni31Si12+Ni2Si→Ni3Si+NiAl,包渗过程由渗硅为主转变为渗铝为主;渗层硬度增加;摩擦系数由铝粉含量为10%(质量分数,下同)时的0.37降低到45%时的0.18,分别为纯铜的1/2,1/5。 展开更多
关键词 cu基体 Ni镀层 渗Si渗层 Ni—Si金属间化合物 摩擦系数
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Fe-20Cu基自润滑摩擦材料的摩擦学性能研究 被引量:1
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作者 付传起 项永矿 +3 位作者 王宙 杨梓健 高越 星仓龙 《材料保护》 CAS CSCD 2021年第1期45-50,共6页
为探究双润滑组元G-MoS2(G表示石墨)对Fe-20Cu基自润滑摩擦材料组织及性能的影响,通过粉末冶金热压法制备了Fe-20Cu基自润滑摩擦材料,并对其进行扫描电镜、X射线衍射表征以及摩擦学性能测试分析。结果表明:在Fe-20Cu基自润滑摩擦材料中... 为探究双润滑组元G-MoS2(G表示石墨)对Fe-20Cu基自润滑摩擦材料组织及性能的影响,通过粉末冶金热压法制备了Fe-20Cu基自润滑摩擦材料,并对其进行扫描电镜、X射线衍射表征以及摩擦学性能测试分析。结果表明:在Fe-20Cu基自润滑摩擦材料中,随着G-MoS2含量的升高,摩擦材料硬度和抗压强度先增大后减小。当加入3%(质量分数,下同) G-3%MoS2时,摩擦材料硬度和抗压强度最高,分别为81 HB和350 MPa。另外,随着G-MoS2含量升高,摩擦材料摩擦系数和磨损率先降低后增加。当加入3%G-3%MoS2时,摩擦材料摩擦系数和磨损率最低,分别为0.472和9.80×10^(-11)kg/(N·m),此时氧化磨损占主导地位。G和MoS2的加入使Fe-20Cu基自润滑摩擦材料的晶粒更为细化,改善了摩擦材料的力学性能和摩擦学性能。 展开更多
关键词 Fe-20cu基体 G-MoS2 粉末冶金 组织结构 摩擦系数 磨损率
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Preparation and properties of novel Cu-based bulk metallic glasses Cu_(55-x)Zr_(37)Ti_8In_x 被引量:2
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作者 皮锦红 潘冶 +2 位作者 吴继礼 张露 贺显聪 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第10期2989-2993,共5页
The glassy rods were successfully fabricated in the Cu-Zr-Ti-In alloy system by casting into a copper mold. The value of ATx reaches a maximum of 66 K for the BMG CusoZraTTi8In5 alloy. The reasons for enhancing glass ... The glassy rods were successfully fabricated in the Cu-Zr-Ti-In alloy system by casting into a copper mold. The value of ATx reaches a maximum of 66 K for the BMG CusoZraTTi8In5 alloy. The reasons for enhancing glass forming ability of Cu-based BMGs with the addition of indium were discussed from atomic size and thermodynamics. Alternatively, the BMG Cu52Zra7Ti8In3 exhibits the highest compressive strength (1981 MPa) and the best plasticity among glassy Cu55-xZra7TisInx (x_〈5). The total plastic deformation of Cu52Zr37TisIn3 before fracture approaches 1.2%. 展开更多
关键词 cu-Zr-Ti-In alloy INDIUM cu-based alloy bulk metallic glass glass forming ability mechanical properties
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Effects of Y addition on structural and mechanical properties of CuZrAl bulk metallic glass 被引量:6
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作者 许宏伟 杜宇雷 邓昱 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第4期842-846,共5页
The effects of Y addition on the structural and mechanical properties of CuZrAl bulk metallic glass(BMG) were studied.The results show that the glass forming ability of CuZrAl system is improved by the addition of Y... The effects of Y addition on the structural and mechanical properties of CuZrAl bulk metallic glass(BMG) were studied.The results show that the glass forming ability of CuZrAl system is improved by the addition of Y and the fracture strength decreases with Y addition due to the reduction of binding energy induced by Y.The fracture surface is dominated by vein-like patterns in Cu45Zr48Al7 bulk metallic glass,and changes to smooth regions in Cu46Zr42Al7Y5 BMG.TEM observation shows that Cu45Zr48Al7 BMG has a composite microstructure of nanocrystalline phases dispersed in amorphous matrix.However,the Cu46Zr42Al7Y5 BMG shows a fully amorphous structure. 展开更多
关键词 bulk metallic glass cu-based alloy Y addition
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Effect of melt infiltration parameters on microstructure and mechanical properties of tungsten wire reinforced(Cu_(50)Zn_(43)Al_(7))_(99.5)Si_(0.5) metallic glass matrix composite 被引量:2
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作者 Ebrahim Karimi SAEIDABADI Reza GHOLAMIPOUR Behrouz GHASEMI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第8期2624-2629,共6页
Using melt infiltration casting at different temperatures (965, 990 and 1015 °C) for different time (10 and 15 min), the composites of (Cu50Zr43Al7)99.5Si0.5 bulk metallic glass reinforced with tungsten wir... Using melt infiltration casting at different temperatures (965, 990 and 1015 °C) for different time (10 and 15 min), the composites of (Cu50Zr43Al7)99.5Si0.5 bulk metallic glass reinforced with tungsten wires were produced. X-ray diffraction (XRD), scanning electron microscopy (SEM) and quasi-static compression tests were carried out to evaluate the microstructure and mechanical properties. The results show that the maximum ultimate compressive strength and strain-to-failure of about 1880 MPa and 16.7% were achieved, respectively, at the infiltration temperature of 965 °C for 15 min. 展开更多
关键词 cu-based bulk metallic glass matrix composite melt infiltration shear band tungstenwire
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Structure and denitration performance of carbon-based catalysts prepared from Cu-BTC precursor 被引量:8
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作者 Li ZHANG Lei HUANG +1 位作者 Yi-hong QIN Bai-zhen CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第5期980-988,共9页
Using Cu-BTC prepared by hydrothermal method as precursor, carbon-based catalysts were obtained as model materials for low-temperature DeNO_x. These catalysts were characterized by X-ray diffractometry(XRD), Raman s... Using Cu-BTC prepared by hydrothermal method as precursor, carbon-based catalysts were obtained as model materials for low-temperature DeNO_x. These catalysts were characterized by X-ray diffractometry(XRD), Raman spectroscopy, scanning electron microscopy(SEM) and energy dispersive X-ray spectrometry(EDS). The results showed that all carbon-based catalysts held the octahedron shape of Cu-BTC in most parts, and they mainly consisted of face-centered cubic copper. CuO_x/C exhibited excellent catalytic activity, and such catalytic activity was further improved with the introduction of Ag. The catalyst with a Cu to Ag mole ratio of 6:1 and an activated temperature of 600 °C showed the best catalytic performance, and its catalytic denitration rate reached 100% at a temperature as low as 235 °C. During the catalytic reaction process, Cu~+ mainly played a catalytic role. 展开更多
关键词 metal organic frameworks cu-BTC precusor carbon-based catalyst low-temperature denitzaion CO
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Investigation of lattice capacity effect on Cu2+-doped SnO2 solid solution catalysts to promote reaction performance toward NOx-SCR with NH3
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作者 Xianglan Xu Yunyan Tong +7 位作者 Jingyan Zhang Xiuzhong Fang Junwei Xu Fuyan Liu Jianjun Liu Wei Zhong Olga ELebedeva Xiang Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2020年第5期877-888,共12页
To understand the effect of the doping amount of Cu^2+ on the structure and reactivity of SnO2 in NOx-SCR with NH3, a series of Sn-Cu-O binary oxide catalysts with different Sn/Cu ratios have been prepared and thoroug... To understand the effect of the doping amount of Cu^2+ on the structure and reactivity of SnO2 in NOx-SCR with NH3, a series of Sn-Cu-O binary oxide catalysts with different Sn/Cu ratios have been prepared and thoroughly characterized. Using the XRD extrapolation method, the SnO2 lattice capacity for Cu^2+ cations is determined at 0.10 g Cu O per g of SnO2, equaling a Sn/Cu molar ratio of 84/16. Therefore, in a tetragonal rutile SnO2 lattice, only a maximum of 16% of the Sn4+ cations can be replaced by Cu^2+ to form a stable solid solution structure. If the Cu content is higher, Cu O will form on the catalyst surface, which has a negative effect on the reaction performance. For samples in a pure solid solution phase, the number of surface defects increase with increasing Cu content until it reaches the lattice capacity, as confirmed by Raman spectroscopy. As a result, the amounts of both active oxygen species and acidic sites on the surface, which critically determine the reaction performance, also increase and reach the maximum level for the catalyst with a Cu content close to the lattice capacity. A distinct lattice capacity threshold effect on the structure and reactivity of Sn-Cu binary oxide catalysts has been observed. A Sn-Cu catalyst with the best reaction performance can be obtained by doping the SnO2 matrix with the lattice capacity amount of Cu^2+. 展开更多
关键词 SnO2-based solid solution Lattice capacity of cu^2+ XRD extrapolation method NOx-SCR with NH3 Threshold effect
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Process optimization,microstructures and mechanical/thermal properties of Cu/Invar bi-metal matrix composites fabricated by spark plasma sintering 被引量:8
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作者 Qiang-qiang NIE Guo-hong CHEN +2 位作者 Bing WANG Lei YANG Wen-ming TANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第10期3050-3062,共13页
An orthogonal experiment scheme was designed to investigate the effects of the Cu content,compaction pressure,and sintering temperature on the microstructures and mechanical and thermal properties of(30−50)wt.%Cu/Inva... An orthogonal experiment scheme was designed to investigate the effects of the Cu content,compaction pressure,and sintering temperature on the microstructures and mechanical and thermal properties of(30−50)wt.%Cu/Invar bi-metal matrix composites fabricated via spark plasma sintering(SPS).The results indicated that as the Cu content increased from 30 to 50 wt.%,a continuous Cu network gradually appeared,and the density,thermal conductivity(TC)and coefficient of thermal expansion of the composites noticeably increased,but the tensile strength decreased.The increase in the sintering temperature promoted the Cu/Invar interface diffusion,leading to a reduction in the TC but an enhancement in the tensile strength of the composites.The compaction pressure comprehensively affected the thermal properties of the composites.The 50wt.%Cu/Invar composite sintered at 700℃ and 60 MPa had the highest TC(90.7 W/(m·K)),which was significantly higher than the TCs obtained for most of the previously reported Cu/Invar composites. 展开更多
关键词 spark plasma sintering(SPS) cu/Invar bi-metal composite microstructure interface diffusion mechanical property thermal property
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CeO_2对渗Si层组织和耐磨性能的影响 被引量:1
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作者 王红星 柳秉毅 +1 位作者 杨少锋 张炎 《材料热处理学报》 EI CAS CSCD 北大核心 2013年第5期170-174,共5页
采用料浆包渗法,以SiO2粉为Si源,纯Al粉为还原剂,NaF和NH4Cl作为复合活化剂,Al2O3为惰性添加剂,蛋白质(鸡蛋清)为粘结剂,在Cu表面预先镀Ni层随后900℃、12 h表面渗Si,制备渗Si层。分别研究了CeO2和Al粉含量对渗Si层组织和摩擦性能的影... 采用料浆包渗法,以SiO2粉为Si源,纯Al粉为还原剂,NaF和NH4Cl作为复合活化剂,Al2O3为惰性添加剂,蛋白质(鸡蛋清)为粘结剂,在Cu表面预先镀Ni层随后900℃、12 h表面渗Si,制备渗Si层。分别研究了CeO2和Al粉含量对渗Si层组织和摩擦性能的影响。结果表明:当铝粉含量20%时,CeO2含量由3%增加到6%,渗层组织为Ni2Si+NiSi相;当CeO2含量6%时,铝粉含量由20%增加到30%,渗层组织变化过程:Ni2Si+NiSi→NiAl→Ni2Al3相,包渗过程由渗硅向渗铝转变;两种渗层的最小摩擦系数都约为纯铜的1/5。 展开更多
关键词 cu基体 Ni-Si金属间化合物 Ni-Al金属间化合物 摩擦系数
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