烧结金属含油轴承

含油轴承的主要特点是具有自润滑性能,它属于滑动轴承范畴.烧结金属含油轴承的主要特征之一是运转时它比滚动轴承噪音小.烧结金属含油轴承材质大致可分为铁基、铜基及铝基三类.表1列出烧结金属含油轴承的材料规格(JISB1581).表2列出烧结金属含油轴承的各种特性.     

镶嵌型固体自润滑滑动轴承的摩擦磨损探讨

介绍了金属基镶嵌型固体自润滑滑动轴承在高温下的摩擦特性，分析了这种轴承的磨损机理，并提出在高温及锻压设备上应用的建议。     

XQZ63金属基镶嵌型固体自润滑轴承

武汉粉末冶金研究所研制,武汉粉末冶金厂生产的海星牌XQZ63金属基镶嵌型固体自润滑轴承于1988年获国家质量银质奖。该轴承适于重载低速高温恶劣条件下应用,广泛用于冶金、矿山、船舶、化工、造纸、     

铜对高硼铁基轴承材料组织及摩擦学特性的影响

采用粉末冶金压制烧结工艺制备了含铜量不同的高硼铁基自润滑轴承复合材料,并在HDM20型端面摩擦磨损试验机上对其进行了验证试验,利用X射线衍射仪、扫描电镜和能谱分析仪分析了铜对高硼铁基烧结轴承材料组织结构、摩擦磨损特性的影响及作用机理。结果表明:铁基烧结轴承材料内部形成的硼化物会使基体结合强度变差,劣化其力学及摩擦学特性;而铜能在高硼铁基复合材料中形成合金相,起到"黏结"作用,铜的质量分数为20%时材料内部组织的结合强度、密度及硬度协调适宜,综合摩擦学性能优良。     

无油轴承带动模具行业革命

金属基镶嵌式固体自润滑轴承（简称JDB）是一种兼有金属轴承特点和自润滑轴承特点的新颖润滑轴承,由金属基体承受载荷,特殊配方的固体润滑材料起润滑作用.它具有承载能力高、耐冲击、耐高温、自润滑能力强等特点,特别适用于重载、低速、往复或摆动等难以润滑和形成油膜的场合,也不怕水冲和其它酸液的浸蚀和冲刷.广大用户普遍反映镶嵌轴承不仅节油、节能,而且其工作寿命也比普通滑动轴承长.目前产品已广泛应用在冶金连铸机、轧刚设备、矿山机械、船舶、汽轮机、水轮机、注塑机及设备生产流水线中。     

无油轴承是模具行业所需新产品

金属基镶嵌式固体自润滑轴承(简称JDB)是一种兼有金属轴承特点和自润滑轴承特点的新颖润滑轴承,由金属基体承受载荷,特殊配方的固体润滑材料起润滑作用。它具有承载能力高,耐冲击,耐高温,自润滑能力强等特点,特别适用于重载,低速,往复或摆动等难以润滑和形成油膜的场合,也不怕水冲和其它酸液的浸蚀和冲刷。广大用户普遍反映镶嵌轴承不仅节油,节能,而且其工作寿命也比普通滑动轴承长。目前产品已广泛应用在冶金连铸机、轧刚设备、矿山机械、船舶、汽轮机、水轮机、注塑机及设备生产流水线中。1.由于特殊生产工艺的要求,工矿企业的某些关键…     

水轮机导叶轴承滑痕分析及其润滑改善

分析了水轮机导叶国体镶嵌自润滑轴承滑痕产生的原因，并将导叶轴承由固体镶嵌自润滑轴承改为无油自润滑轴承，有效地改善了轴承性能。     

金属基镶嵌型固体自润滑轴承粉末热锻浮动密封环可靠性考核审定会在汉召开

1992年11月20至21日,武汉粉末冶金厂“金属基镶嵌型固体自润滑轴承”和韶关粉末冶金厂“热锻浮动密封环”的可靠性考核审定会在武汉召开,出席会议的有:国家机电部机械基础产品司,国家粉末治金制品质量监督检测中心,武汉市机电局,武汉市产品质量监督检验所     

镶嵌自润滑关节轴承及其润滑材料的制备

采用镶嵌自润滑轴承替代船闸闸门支撑铰的原有轴承。镶嵌自润滑材料采用了超细粉ＭｏＳ２作为主要成份,介绍了镶嵌自润滑材料的制备过程,自润滑复合材料具有良好的润滑性能,能够满足实际需求。     

轴承外圈内球面上镶自润滑垫层锁紧孔的加工

某公司有多种系列大型号推力自润滑轴承,因产品功能要求,在其外圈内球面上镶嵌自润滑垫层,为防止垫层脱落需镶嵌后再锁紧。该多种系列大型号推力自润滑轴承镶嵌自润滑垫层后再锁紧的锁紧孔排列如图1所示,每个锁紧孔的中心线均要求通过球心,内球面球心O在工件外面。     

Tribological behavior of Fe-based bulk metallic glass

The unlubricated tribological characteristics of coating layers containing an Fe-based amorphous matrix have been investigated in air using an alumina ball with a diameter of 3.1 mm. From the ball-on-disk test system, the friction coefficient could be measured for up to 3,000 seconds. The temperature changes on the worn surfaces were also simultaneously measured using an infrared thermometer. Three different types of coating layers having an Fe-based amorphous matrix, an Fe-based amorphous matrix with embedded Ni-based self-fluxing alloy particles, and an Fe-based amorphous matrix with embedded WC particles were prepared through a high velocity oxy-fuel (HVOF) process. Although the coating layers have certain levels of porosity, unique frictional characteristics attributed to the amorphous matrix were observed during the friction tests. Compared with conventional bearing steels such as AISI 521000 (Hv=840), excellent tribological and wear characteristics were obtained, demonstrating that an Fe-based bulk metallic glass powder is a viable engineering material for practical anti-wear coating applications.     

看谱镜在锌基合金成分分析中的应用研究

对锌合金可见光谱线进行计算机模拟,研究了基体元素锌和各成分元素的可见光谱特征.使用光栅看谱镜和棱镜看谱镜对锌合金可见光谱进行分析研究,并摄制了彩色图谱.讨论了利用锌元素及成分元素特征谱线进行基体鉴别和成分元素分析的方法.实验证明,该方法可用于锌合金基体鉴别及各成分元素的定性和半定量分析.     

Sliding wear behavior of Fe-based bulk metallic glass at high temperature

In the past decade Fe-based bulk metallic glasses (BMGs) have attracted increasing attention due to their beneficial properties, including high glass forming ability (GFA), high strength and hardness and high fracture toughness in both fundamental science and engineering application. Most research using these materials has been conducted at room temperature environment, and research that assesses their behavior especially at high temperature has been scarce. We present the results of high temperature effect on the friction and wear behavior of Fe-based bulk metallic glass (BMG), and we tested that this material may satisfy wear and oxidation resistance at high temperature as well as to explore the high temperature wear mechanism of the Fe-based BMG. The dry sliding tribological behaviors of Febased BMG against Si₃N₄ ceramic were conducted with a pin-on-disc friction and wear tribometer. The morphology of the worn surfaces of Fe-based BMG was examined by scanning electron microscopy (SEM) and the chemical composition characterized with energy dispersive spectroscopy (EDS) to observe the wear characteristics and investigate the wear mechanisms. The overall average friction coefficient value generally decreased with increasing temperature, and the glass transition and the formation of protective oxide film played an important role in the tribological behavior of BMG. The wear resistance of Fe-based BMG was not only from their hardness but also from the formation protective oxide layer. Analysis of the worn surface revealed abrasion, plastic deformation and oxidation during sliding test.     

Fe基非晶涂层的组织结构与耐磨性研究

利用电弧喷涂技术在45#钢基体上制备了Fe基非晶合金涂层。与YG8球配副,在干摩擦条件下对涂层与45#钢的摩擦磨损性能进行了对比研究。采用XRD、扫描电镜及显微硬度计等分析仪器对涂层组织结构及磨损形貌进行表征。结果表明:涂层中含有非晶相,孔隙率较少,涂层平均硬度高达HV1124。与45#钢相比,涂层的摩擦因数较小,耐磨性明显高于45#钢基体,其磨损机制以片状剥落为主。     

混合稀土和TiH2对金刚石工具用铁基胎体性能的影响

研究了不同含量富Ce混合稀土(Re)在不同烧结温度下对含有质量分数为2%的TiH2和不含TiH2的铁基胎体显微组织和力学性能的影响.实验结果表明铁基胎体的抗弯强度和硬度随混合稀土含量的增加而增加,抗弯强度增加的幅度比硬度增加的幅度大,同时稀土元素在不含TiH2的Fe基胎体中的作用比在含有TiH2的Fe基胎体中的作用显著.在含TiH2的Fe基胎体中,当稀土质量分数为0.5%时,胎体的抗弯强度达到最大值,抗弯强度的最大值增幅为12.4%;在不含2%(质量分数)TiH2的Fe基胎体中,当稀土质量分数为1.1%时,胎体的抗弯强度达到最大值,抗弯强度的最大增幅为35.1%.不含TiH2的铁基胎体的抗弯强度高于含有2%(质量分数)TiH2的铁基胎体,而且两种胎体抗弯强度的差距随着稀土含量的增加而不断增大,二者之间抗弯强度的最大差值约230 MPa.添加微量的稀土使铁基胎体的孔隙率降低,晶粒细化,而添加TiH2使铁基胎体的孔隙率增加,并在组织中出现粗大的脆性相.     

合金钢中钒元素可见光谱快速分析方法研究

使用数字化分析系统代替人眼视觉判断,将合金钢中V元素谱图转变为数字化的电子谱图,解决了谱图的量化分析和记录难题.选用合金钢中V元素V437.92nm和V487.55nm分析谱线组进行数字化分析测定,兼顾了Cr、Mo、Ni和W等元素的测定,可以实现同一视场中多种元素同时快速分析.分别选用V437.92nm和Fe437.59nm作为分析谱线和比较谱线,对4种不同V元素含量的合金钢标准样品进行了定量分析探索,数据显示分析谱线和比较谱线的强度比值与V元素含量成正比关系.结果表明,数字化技术保持快速分析特点的同时可以达到定量分析目的,能够有效解决合金钢中V元素的快速定量分析及材料牌号鉴别问题.     

铁基非晶合金涂层切削工艺参数优化和切削力预测

采用响应曲面法中的Box-Behnken 实验设计方法（BBD）,设计出四因素三水平的Fe基非晶合金涂层切削力实验方案,研究切削参数（切削速度、进给量和切削深度）和刀具结构参数的变化对Fe基非晶合金涂层切削力的影响规律和影响因素,运用方差分析法获取了影响切削力分量的显著性水平,得到低切削速度下Fe基非晶合金涂层的最佳切削工艺参数。通过对实验数据的多元二次拟合,建立了Fe基非晶合金切削力最小二乘回归预测模型,并通过实例验证了Fe基非晶合金涂层切削力预测模型的可行性和实用性。     

TiC-VC颗粒增强Fe基熔敷层组织与耐磨性能

以H08A为焊芯，以钛铁、钒铁和石墨等为药皮组分，利用焊接电弧高温冶金反应，在Q235基体上制备TiC-VC复合超硬颗粒增强Fe基熔敷层。利用扫描电镜、X射线衍射仪、透射电镜、能谱分析仪及磨损试验，研究了熔敷层的组织、性能及组分加入量对熔敷层性能的影响。研究结果表明：冶金反应形成的TiC-VC颗粒尺寸细小，且弥散分布在基体上；熔敷层硬度在HRC55以上，具有很高的耐磨性和良好的抗裂性；钛铁、钒铁及石墨加入量（质量分数）分别为15％～18％、12％～14％和8％～10%时，熔敷层具有良好的耐磨性能和抗裂性能。     

Design and performance of a pulse transformer based on Fe-based nanocrystalline core

A dry-type pulse transformer based on Fe-based nanocrystalline core with a load of 0.88 nF, output voltage of more than 65 kV, and winding ratio of 46 is designed and constructed. The dynamic characteristics of Fe-based nanocrystalline core under the impulse with the pulse width of several microseconds were studied. The pulse width and incremental flux density have an important effect on the pulse permeability, so the pulse permeability is measured under a certain pulse width and incremental flux density. The minimal volume of the toroidal pulse transformer core is determined by the coupling coefficient, the capacitors of the resonant charging circuit, incremental flux density, and pulse permeability. The factors of the charging time, ratio, and energy transmission efficiency in the resonant charging circuit based on magnetic core-type pulse transformer are analyzed. Experimental results of the pulse transformer are in good agreement with the theoretical calculation. When the primary capacitor is 3.17 μF and charge voltage is 1.8 kV, a voltage across the secondary capacitor of 0.88 nF with peak value of 68.5 kV, rise time (10%-90%) of 1.80 μs is obtained.     

Nb reinforced Fe-Mn-Si shape memory alloy composite coating fabricated by laser cladding on 304 stainless steel surface

Journal of Mechanical Science and Technology - Laser cladding technology was adapted to fabricate Fe-based shape memory alloy/Nb composite coatings with 5 wt. % Nb doping amounts on 304 stainless...