Effect of Fe content on the friction and abrasion properties of copper base overlay on steel substrate by TIG welding

Copper base alloy was overlaid onto 35CrMnSiA steel plate by tungsten inert gas （TIG） welding method. The heat transfer process was simulated, the microstructures of the copper base overlay were analyzed by scanning electron microscopy （SEM） and energy dispersive spectrometer （EDS）, and the friction and abrasion properties of the overlay were measured. The results show that the Fe content increases in the overlay with increasing the welding current. And with the increase of Fe content in the overlay, the friction coefficient increases and the wear mechanism changes from oxidation wear to abrasive wear and plough wear, which is related to the size and quantity of Fe grains in the overlay. While with the increase of Fe content in the overlay, the protection of oxidation layer against the oxidation wear on the melted metal decreases.

Estimation of rock Fe content based on hyperspectral indices

Information on the Fe content of bare rocks is needed for implementing geochemical processes and identifying mines.However,the influence of Fe content on the spectra of bare rocks has not been thoroughly analyzed in previous studies.The Saur Mountain region within the Hoboksar of the Russell Hill depression was selected as the study area.Specifically,we analyzed six hyperspectral indices related to rock Fe content based on laboratory measurements(Dataset I)and field measurements(Dataset II).In situ field measurements were acquired to verify the laboratory measurements.Fe content of the rock samples collected from different fresh and weathered rock surfaces were divided into six levels to reveal the spatial distributions of Fe content of these samples.In addition,we clearly displayed wavelengths with obvious characteristics by analyzing the spectra of these samples.The results of this work indicated that Fe content estimation models based on the fresh rock surface measurements in the laboratory can be applied to in situ field or satellite-based measurements of Fe content of the weathered rock surfaces.It is not the best way to use only the single wavelengths reflectance at all absorption wavelengths or the depth of these absorption features to estimate Fe content.Based on sample data analysis,the comparison with other indices revealed that the performance of the modified normalized difference index is the best indicator for estimating rock Fe content,with R2 values of 0.45 and 0.40 corresponding to datasets I and II,respectively.Hence,the modified normalized difference index(the wavelengths of 2220,2290,and 2370 nm)identified in this study could contribute considerably to improve the identification accuracy of rock Fe content in the bare rock areas.The method proposed in this study can obviously provide an efficient solution for large-scale rock Fe content measurements in the field.

Influence of Fe Content on Tool Galling in Ironing Aluminum Beverage Cans

Insoluble constituents in 3104 alloy for beverage cans manufacturing play an important role in deep ironing process. This paper studies the effect of Fe content in the alloy on volume fraction of the constituents Al6(Fe, Mn)3 and Al12(Fe, Mn)3Si and its influence on ironing die pickup. It is shown that with Fe content increase, the amount of these constituents rises that helps prevent tool galling. Trials made at a can plant showed less ironing die changeovers at bodymakers. The optimum Fe content for aluminum can production can be considered between 0.47% and 0.53% that corresponds to 2.0% - 2.3% of insoluble constituent volume fraction. Greater amounts than this cause problems with excessive constituent particle formation and earing;smaller amounts result in increased ironing die galling.

Fe、Ni元素微合金化对Al-11Si铝合金微观组织及力学性能的影响

本研究利用扫描电子显微镜(SEM)、能量散射X射线光谱(EDS)和拉伸试验机,研究了Ni(1.2及1.6wt.%)和Fe(0.6及0.8wt.%)含量对Al-11Si铝合金的微观组织及不同温度下的力学性能的影响。实验结果表明,适量的Ni元素对于Al-11Si合金中富含Fe相的类型、形态和分布具有积极作用。在Al-11Si铝合金中添加1.2wt.%Ni和0.6wt.%Fe可以生成一种类似“汉字状”的富Fe强化相。当进一步增加到1.6wt.%Ni和0.8wt.%Fe后,富Fe相变为了长针状,对Al基体产生严重的割裂作用,降低了合金力学性能。由于含有1.2wt.%Ni和0.6wt.%Fe的Al-11Si铝合金中生成了“汉字状”富Fe强化相,合金的高温拉伸性能得到了显著改善。在350℃的测试温度下,Al-11Si铝合金的抗拉强度(UTS)达到了139 MPa。

Fe含量对再生铝硅合金组织和性能的影响

利用金相显微镜、X射线衍射仪、万能拉伸试验机等研究了Fe含量对再生铝硅合金组织和性能的影响,并对该合金中富铁相形态进行了定量分析。结果表明:当Fe含量从0.796%增加到1.301%时,合金组织中二次枝晶臂间距先减小再增大再减小;富铁相形貌的演变过程为紧密汉字状→汉字状+鱼骨状→汉字状+鱼骨状+针状→针状+汉字状→针状;合金中的富铁相面积分数逐渐上涨,富铁相长度不断增长,尤其当Fe含量从1.022%上升到1.301%,针状β-Fe相长度显著增长,平均长度最长可达119.5μm;β-Fe相的出现导致合金力学性能的显著下降,当Fe含量增至1.301%时,合金抗拉强度和伸长率相比0.796%Fe时分别下降26.26%和52.58%。

Fe元素对TC4钛合金显微组织和力学性能的影响

主要研究Fe含量对TC4钛合金显微组织和力学性能的影响。对比分析了添加w_(Fe)=0.05%的TC4试样1和添加w_(Fe)=0.23%的TC4试样2经过相同锻造及热处理后的室温拉伸、400℃高温拉伸、室温冲击试验结果及金相显微组织。结果表明:增加w_(Fe)≈0.2%后,初生α相含量降低约9%。次生α相片层厚度增加且呈交叉混乱排列。室温拉伸、室温冲击和400℃高温拉伸的强度显著提高,室温抗拉强度和屈服强度增加约55MPa。400℃高温抗拉强度增加约30MPa。这是因为在拉伸过程中,位错滑移过程中所遇到的阻碍增大,导致大量位错塞积在弥散的强化相中;同时随着Fe元素增加,与钛合金形成固溶体时产生较大的晶格畸变,也能提高钛合金的强度,但对室温拉伸和400℃高温拉伸的塑性无明显影响。

RESEARCHES ON RELATIONSHIP BETWEEN HEARING LOSS AND CONTENT OF Fe AND Zn IN PERILYMPH，CSF，SERUM，AND HAIRS

Fe and Zn levels in perilymph in guinea pigs injected with gentamicin(GM)were examined in this experlment,and those leves were compared with their correspondents in CSF,serum andhairs.Preventive and therapeutic actions of seabuckthorn oil and injective gastrodini to hearing losswe observed.The results showed:①Fe content in perilymph and hair in GM ototxic guinea Pigswas increased,and was decreased after prevention and treating. There was no obvious change in CSFand serum.②Zn content in perilymph was increased in GM ototoxic guinea pigs,and was furtherincreased after prevention.Zn contents in serum and hairs were significantly decreased.The resultssuggest that GM ototoxic reaction is related to increasing Fe contents,and elevation ot Zn content isrelated to the compensative reaction of the body.The cjamges of chemical elements in perilymph aremore important than those in CSF,serum and hairs for pathologic changes in the cochlea,seabuckthorn oil can prevent GM ototoxic reaction.

Effect of Fe content on FeMn catalysts for light alkenes synthesis

The effect of Fe content on FeMn/MgO catalysts for light alkenes synthesis through CO hydrogenation was investigated.Catalysts were prepared by a conventional co-impregnation method,characterized using BET,X-ray powder diffraction(XRD)and Temperature-programmed reduction(H_(2)-TPR)techniques.High activity was obtained over the catalyst with 9 wt-%Fe content,over which CO conversion and the selectivity of C2^(=)-C4^(=)reached 91.36%and 58.48%,respectively.With the increase of Fe content,both the conversion and the selectivity were improved within a certain range and then decreased.The results show that the surface area of the catalyst played an important role in the catalytic reaction.With the increase of Fe loading,the interaction action between Fe and Mn was enhanced and FeMn solid solution was formed.

Fe元素含量和形变工艺对Cu-Fe合金组织与性能影响的研究进展

高强高导铜合金在电子、机械、交通通信等领域应用广泛,而Cu‐Fe合金因其较好的强度和导电性,低廉的成本成为了高强高导铜合金的重要研究方向之一。综述了高强高导Cu‐Fe合金的研究进展,针对Cu‐Fe合金强度和导电性倒置问题,总结了Fe元素含量对合金组织、抗拉强度和导电性的影响规律;阐述了拉拔、轧制等形变工艺对合金组织与性能的影响及其机理;展望了高强高导Cu‐Fe合金的未来发展趋势;提出第三元素(如P,Ag,Co,Ni或稀土)的合金化调控是有效改善Cu‐Fe合金综合性能的发展方向之一。

Fe含量对铝合金阳极合金电化学材料性能的影响

我国现有材料含有大量的杂质,极大地影响牺牲阳极的电化学性能,采用外国的配方技术、利用我国的原材料,生产不出理想的牺牲阳极材料,在众多的杂质元素中,Fe的含量对牺牲阳极材料的电化学性能影响比较大,研究了Fe含量对铝合金阳极合金材料性能的影响,结果表明:(1)如果Fe的含量过量,此时的铝阳极变成阴极性,在牺牲阳极的铝合金材料内部形成大量微电池,从而恶化牺牲阳极材料的电化学性能;(2)生产牺牲阳极选择铝锭原材料Fe的含量在0.10%附近时,呈现优良的电化学性能。

Fe含量对Al-Mg-Si合金微观组织和力学性能的影响

采用电子拉伸试验机、金相显微镜、扫描电镜、透射电镜等检测手段,研究不同固溶温度下Fe含量对Al-MgSi合金铸棒微观组织和力学性能的影响。结果表明:Fe含量为0.14%(质量分数,下同)时,Al-Mg-Si合金具有最高的强度和断后伸长率,随着固溶温度升高,合金强度不断提高,固溶温度520℃以上时合金强度趋于高点,抗拉强度280 MPa,屈服强度259 MPa,断后伸长率13.40%;时效处理后晶界处富Fe相是球形的α-Al_(8)Fe_(2)Si,对合金基体割裂作用弱,弥散分布在晶界处起到钉扎晶界的作用;当Fe含量低于0.14%时,晶界处球形的α-Al_(8)Fe_(2)Si极少,钉扎晶界弱,在500℃以上固溶时,晶粒明显长大,断后伸长率大幅度降低;当Fe含量高于0.14%时,富Fe相多为长条状的β-Al_(5)FeSi,对界面割裂作用强,随着Fe含量增加,合金强度和断后伸长率不断降低;此外,Fe含量影响β"相时效过程的析出转变,Fe含量为0.14%时,β"强化相析出的尺寸小、数量多、分布密集,对位错运动阻碍作用最强。

Cu元素添加对Fe基非晶合金结构-性能影响的研究进展

非晶合金(metallic glass, MG)因其独特的短程有序、长程无序结构,具有许多优异的物理和化学特性。其中,Fe基非晶合金(Fe-based metallic glass, Fe-MG)由于优异的磁性能、力学性能、耐腐蚀性能,及其原材料成本低等优势,显示出巨大的应用前景和研究价值。近年来,研究者们致力于通过合金成分设计调控Fe-MG的结构,进而改变材料的变形行为与性能特征。研究发现,Cu元素的添加可以显著影响FeMG的理化性质和力学性能。通过深入分析Cu元素对传统Fe-MG、纳米晶合金和高熵MG结构和性能的不同影响,探讨Cu元素的添加对MG的弛豫行为、晶化行为、熔化和凝固行为、玻璃转变行为、玻璃形成能力、机械性能、磁性能与其他性能的作用机制,发现Cu元素的添加能够促进Fe-MG基体中α-Fe团簇的析出,从而改变材料的变形行为与性能特征。研究结果表明:有望通过成分设计来调控MG的变形行为,进而为实现性能优化提供理论指导和实验参考。

C与Cr含量对粉末锻造Fe-Cu-C-Cr合金组织和物理性能影响

通过改变粉末锻造Fe-Cu-C-Cr合金中C、Cr的质量分数,研究C、Cr含量对合金组织和物理性能的影响。结果表明:在不添加Cr的情况下,合金的组织主要为铁素体和渗碳体,合金硬度和抗拉强度随C含量的增加小幅增加,C含量对合金最终摩擦系数的影响不大;添加Cr元素后,合金密度降低,组织也较为复杂,合金硬度随Cr含量的增加而增加,最高可达HRA68.6。C和Cr共同影响合金高温抗拉强度,Fe-2Cu-0.5C-5Cr抗拉强度最高,为378 MPa。合金摩擦系数随Cr含量的增加而减小,当Cr质量分数为10%时,合金最终摩擦系数为0.195,磨损方式为氧化磨损和少量的磨粒磨损。

原铝Fe含量升高原因分析及应用

针对大型预焙铝电解槽原铝Fe含量升高的问题,分析了氧化铝、氟化铝、阳极炭块等原材料质量、操作质量、生产工艺条件、电解槽破损等方面的原因,采取了严格执行原材料质量验收标准、提高电解生产和阳极组装操作质量、制定并推行生产工艺标准、落实质量管理制度、提高全员质量管理意识等若干措施,使原铝Fe含量从0.131%降低到0.063%。

基于内滤效应的纳米传感器对废水中Fe^(3+)的检测研究

稀土上转换纳米材料由于其发光稳定性好、上转换发光效率高、低自发荧光和高检测灵敏度,在环境检测领域得到广泛的应用。本文采用热分解法,以稀土硬脂酸盐为前驱体,合成形貌规则、尺寸均一和发光性能优异的UCNPs(上转换纳米材料),在UCNPs-HB(竹红菌乙素)上络合Fe^(3+)离子导致内滤效应,从而达到快速检测废水中Fe^(3+)离子的目的,Fe^(3+)浓度范围为100~600μM,检测限为28.42μM。

Co Content Dependence of Crystal Structure and Specific Magnetization of Fe_(1-x)Co_x-SiO_2 Granules Prepared by Sol-Gel Method

The Co content dependence of crystal structure and specific magnetization of Fe1-xCox-SiO2granular solid prepared by the sol-gel method have been studied. It is found that the crystal structure, Iattice parameter and specific magnetization of the FeCo alloy particles depend on the Co content.

成分优化对软磁MnZn铁氧体的影响规律

采用“化学溶胶—喷雾干燥—煅烧”方法制备Mn_(0.5−y)Zn_(0.5)Fe_(2+y)O_(4)(y=0,0.01,0.03,0.05,0.07,0.09)软磁MnZn铁氧体,利用X射线衍射(XRD)、红外光谱(FTIR)、拉曼光谱(Raman)、X射线光电子能谱(XPS)、扫描电镜(SEM)、透射电镜(TEM)和超导量子干涉磁测量系统等检测方法对其进行表征。研究结果表明:当y=0~0.07时,样品均只含有MnZn铁氧体单相;而当y=0.09时,将析出α-Fe_(2)O_(3)杂质相,此现象得到了XRD和Raman光谱结果验证。随着Fe含量的增加,平均晶粒度先减小再增大,当y=0.03时,平均晶粒度最小。样品中的Fe呈+3价,Zn呈+2价,而Mn则存在+2、+3和+4这3种价态,其中,当y=0.09时,样品中Fe^(3+)位于MnZn铁氧体和α-Fe_(2)O_(3)中的环境不同,其Fe2p_(3/2)峰存在结合能分别为710.09、711.16和713.71 eV的3个子峰。样品中Mn^(2+)的含量先增加再减少,在y=0.07时最大。所有样品均呈细小颗粒组成的空心球壳形貌,几乎不存在非空心球壳粉末形貌,且元素均匀化分布。当y=0~0.09时,比饱和磁化强度(M_(s))为41.15~54.58 A·m^(2)/kg,剩磁(M_(r))为0.91~6.50 mA/m,矫顽力(H_(c))为2242.4~8917.6 A/m,矩形比(M_(r)/M_(s))为0.02~0.12。其中,当Fe过量时,M_(s)呈先增大再减小的趋势;当y=0.07时,MnZn铁氧体的综合特性最优。

Fe含量对Cu基金属陶瓷摩擦材料摩擦磨损性能的影响

研究 Fe含量对 Cu基金属陶瓷摩擦材料的摩擦磨损性能的影响。研究结果表明 ,随 Fe含量由 5 %增至 2 0 % ,导致金属陶瓷摩擦材料的磨损缓慢增加 ,而对偶的磨损急剧减少 ;当 Fe含量大于 2 0 %时 ,金属陶瓷摩擦材料的磨损急剧增加 ;同时 ,随 Fe含量的增加 ,金属陶瓷摩擦材料的硬度及摩擦力矩曲线的稳定性得到了提高。

Fe含量及摩擦组元对铜基粉末冶金摩擦材料性能的影响

以电解Cu粉、还原Fe粉、石墨等为主要原料,采用粉末冶金加压烧结工艺制备了Cu基粉末冶金摩擦材料,研究了Fe含量及SiO2、Al2O3、SiC等摩擦组元对烧结合金的显微组织、力学性能和摩擦磨损性能的影响。结果表明:Fe主要影响摩擦材料的力学性能,随Fe含量的增加,摩擦材料的硬度、抗压强度和抗弯强度显著提高,Fe含量为15%(质量分数,下同)时具有高摩擦系数、较低磨损量和稳定的摩擦过程;添加摩擦组元SiC后的材料强度最高、摩擦系数最大、磨损量最小,但增加了对偶材料的磨损,加SiO2后材料摩擦系数最小、磨损量最大,Al2O3所起作用介于二者之间。

Fe含量对Al-Fe合金组织和硬度的影响

研究了不同含Fe量的Al Fe合金中Al3Fe相形貌和Al Fe合金硬度的变化特点。研究发现,Al3Fe相形貌和Al Fe合金硬度的变化存在一个突变成分点。在突变点以下,Al3Fe相形貌总体上呈现粗大的针片状,在突变点以上呈现块状;而合金的硬度在该突变点下与含铁量基本成线性关系,超过这一成分点,硬度值陡增。