汽车用高性能低硅铝基瓦带的制造技术

通过高性能轴承合金AlSn10Si3Pb2Cu的开发，基本掌握了Si的质量分数为2％—3％的铝基轴瓦全套生产技术。应用现有的熔铸及轧制生产设备，通过工艺的优化与调整，使得轴瓦带材的轧制成材率提高到93％以上。与传统AlSn20Cu合金相比，研制合金轴瓦的蓝宝石疲劳强度提高了30％—40％，达到100—115MPa水平，和国外同类产品相当。     

具有高悬浮能力的磁性铀承合金

具有高悬浮能力的磁性铀承合金最近美国卡彭特技术开发公司开发成功一种高性能的磁性轴承合金，取名为“Ｈｉｐｅｒｃｏ５０”，它按单位质量计具有比现有的其它任何磁性合金都高的起重能力和悬浮能力，所以最适用于需要利用磁场来支承并控制象旋转轴之类零部件位置的磁性...     

新型铝基轴承合金的研制

为降低铝基轴承合金生产成本，提高合金的综合性能，我们以Ａｌ－２０％Ｓｎ－１％Ｃｕ合金为基础，开发了新型铝基轴承合金，其成分为：５Ｐｂ，１５Ｓｍ，１Ｃｕ，０．５￣１ＲＥ，余量为Ａｌ。浇注的新合金试样，经３５０℃退火，保温３小时后，其室温机械性能，减磨性和抗咬合性能与原合金相当。     

锌基轴承合金性能的研究

研究了锌基轴承合金的组织特征，并与巴氏合金（ZChSnSb11-6)在MM200磨损实验机上进行了一系列摩擦磨损特性对比试验，结果表明：各种性能指标均相当或优于巴氏合金，且有望成为锡基轴承合金的代用材料。     

ZPbSb15Sn5与低锡轴承合金在大型钢球磨煤机轴承衬上的应用

介绍了ＺＰｂＳｂ１５Ｓｎ５与低锡轴承合金成分、性能及在大钢球磨煤机轴承衬上应用情况，它在静压配合下，形成静动压润滑，保证轴承运行安全，磨损小；其含锡量比高锡轴承合金低６８％，成本低５２％。     

大型乌金瓦焊接修复

轴承是支撑轴进行工作的重要部件，轴瓦一般用优质铸铁或铸钢铸造，在轴瓦内部车出燕尾槽，并浇以内衬，用于制造滑动轴承内衬的合金称为轴承合金。汽轮机和其它旋转设备的常用轴承合金为巴氏合金(即低熔点轴承合金)，俗称乌金。     

添加元素对铝-锡轴承合金性能影响的研究进展

Al-Sn轴承合金被广泛应用于机械行业,在其使用过程中应具备良好的材料性能。针对轴承合金的性能要求,综述了添加元素Cu、Si、Mg对Al-Sn轴承合金性能的影响,以及国内外对Al-Sn轴承合金研究的主要动态。     

无铅铜铋轴承合金的摩擦学特性

采用粉末冶金方法制备了几种典型铜基轴承合金,在HDM-20端面摩擦磨损试验机上进行了边界润滑条件下的摩擦磨损试验,分析了其摩擦学性能.结果表明:3.0％ Bi铜铋轴承合金具有较好的减摩、抗粘着性能,与典型铜铅轴承合金(Cu10Sn10Pb)相比,减摩性能稍好,耐磨性能稍差;两种轴承合金磨损量均随速度的增加而增加,而摩擦系数则随速度增加而降低.摩擦磨损过程中析出表面的铋可起减摩、抗粘着作用,并存在铋的析出、磨损脱落的过程.     

球面瓦铸造工艺

本工艺以2＃锡基轴承合金（ZchSnSb11-6）为例，从球面瓦的结构入手，全面阐述了球面瓦的铸造工艺，从根本上解决了球面瓦的铸造质量。     

Pr-Fe-B稀土磁体铸锭宏观组织的控制与磁特性

Ｐｒ－Ｆｅ－Ｂ稀土磁体铸锭宏观组织的控制与磁特性Ｎｄ－Ｆｅ－Ｂ合金是当前高性能永磁合金的代表，Ｐｒ具有与Ｎｄ同样的性能，但Ｐｒ在地球上蕴藏量却丰富得多。开发高性能Ｐｒ－Ｆｅ－Ｂ磁体的生产工艺具有重大意义，因此，研究了通过铸造工艺的改进生产优质高性能Ｐ...     

模具结构对AZ91镁合金挤压成形性能的影响

AZ91镁合金由于强度高、流动性好等特点,通常用作铸造合金。研究该合金合理的挤压温度、挤压速度及模具结构,对提高其塑性成形性能、开发高强度变形镁合金有重要的理论和实际意义。文章通过热模拟试验研究了AZ91镁合金应力应变关系,确定了最佳变形温度。在此基础上,采用三维有限元法模拟分析了不同挤压速度、模具结构对挤压过程温度场、速度场及应力场的影响。结果表明,采用锥模和流线模时,当定径带长度为15mm~20mm时,可在挤压速度达到5mm/s的条件下成形出表面光滑无裂纹的镁合金棒材;而采用平模挤压时,当定径带长度为10mm~20mm时,获得良好表面质量的挤压速度达到2.5mm/s。在650t的卧式挤压机上,进行了该合金的挤压实验,实验结果与模拟结果相吻合。     

优化预脱氧工艺 降低工艺成本

对超高功率电弧炉生产轴承钢的预脱氧工艺过程进行研究,结果表明:出钢过程中改变合金化顺序,用碳粉平衡掉粗炼钢水中的大部分氧,降低脱氧剂铝的用量,完全可以冶炼出低氧含量的轴承钢。     

基于多体动力学的圆柱滚子轴承局部损伤分析

为研究存在局部损伤下轴承系统的振动响应特征,基于多体动力学方法建立了可预测轴承局部缺陷尺寸、位置和形状的动力学模型,分析了缺陷参数对轴承振动的影响机理。研究结果表明,轴承的振动响应随着缺陷尺寸的增加而逐渐增大;随着缺陷位置远离最大承载区而逐渐减小;矩形缺陷的振动响应最大,三角形缺陷次之,圆形缺陷振动响应最小。通过台架试验得到圆柱滚子轴承振动响应与局部缺陷尺寸及位置的关系,并与仿真结果进行比较,验证动力学分析的合理性,为探寻轴承早期故障机理提供理论参考。     

Effect of TiN/Ti multilayer on fretting fatigue resistance of Ti-811 alloy at elevated temperature

The TiN/Ti multilayer was deposited on Ti-811 alloy surface by magnetron sputtering(MS) technique for improving fretting fatigue(FF) resistance of the titanium alloy at elevated temperature. The element distribution, bonding strength, micro-hardness and ductility of the TiN/Ti multilayer were measured. The effects of the TiN/Ti multilayer on the tribological property and fretting fatigue resistance of the titanium alloy substrate at elevated temperature were compared. The results indicate that by MS technique a TiN/Ti multilayer with high hardness, good ductility and high bearing load capability can be prepared. The MS TiN/Ti multilayer, for its good toughness and tribological behavior, can significantly improve the wear resistance and FF resistance of the Ti-811 alloy at 350 ℃.     

新型超弹性轴承材料TiNi60合金的研究进展

TiNi60合金是一种弹性模量低、硬度大、比强度高、无磁性、尺寸稳定性好、耐腐蚀性强的新型超弹性轴承材料,NASA等国外研究机构对其进行了深入研究。系统阐述了Ti Ni60合金材料的特性,重点论述了其在熔炼与加工、硬度强化机理、力学性能、摩擦学性能、高温抗氧化行为以及超弹性等方面的国内外最新研究进展,分析了相关研究中存在的问题,并简要阐述了超弹性TiNi60合金在航空航天领域的应用前景,探讨了有关TiNi60合金材料亟需研究的内容,以期推动国内外相关研究进展。     

Metallurgical Analysis of Ball Bearing Seized During Operation

440C stainless steel of martensitic grade is being extensively used for bearing application because of its high wear and corrosion resistance. This alloy steel with 1?wt.% C along with 17?wt.% Cr, 1?wt.% Mn and up to 0.75?wt.% Mo has a number of primary carbides, which provide high hardness and good wear resistance. Owing to its unique performance characteristic, this steel finds a number of applications in space program. One such application is bearing used in booster pump assembly of propulsion system. During one of the ground tests of propulsion system, booster pump bearing seized operation after performing its partial intended function. The bearing was removed from the assembly and cut open. The ball and outer caging were analyzed using metallographic techniques and compared with another bearing taken from the fresh stock. Study indicated that ball as well as outer caging experienced exposure to high temperature and resulted in phase transformation. This article highlights the details of investigations carried out.     

Microstructure and property characterization of a modified zinc-base alloy and comparison with bearing alloys

The microstructure and physical, mechanical, and tribological properties of a modified zinc-base alloy have been characterized. In order to assess its utility as a bearing alloy, its properties have also been compared with those of a similarly processed conventional zinc-base alloy and a leaded-tin bronze (conforming to ZA27 and SAE 660 specifications, respectively) used for bearing applications. The modified zinc-base alloy shows promise in terms of better elevated-temperature strength and wear response at higher sliding speeds relative to the conventional zinc-base alloy. Interestingly, the wear behavior (especially the seizure pressure) of the modified alloy was also comparable to that of the bronze specimens at the maximum sliding speed, and was superior at the minimum sliding speed. The modified alloy also attained lower density and better hardness. Alloy behavior has been linked to the nature and type of the alloy microconstituents.