Annealing Effect on Wear Resistance of Nanostructured 316L Stainless Steel Subjected to Dynamic Plastic Deformation

Bulk nanostructured 316L austenitic stainless steel(SS) samples with nano-scale twin bundles embedded in nano-sized grains were synthesized by using dynamic plastic deformation(DPD).Subsequent thermal annealing of the as-DPD sample leads to a single austenitic structure with static recrystallized(SRX) grains in nanostructured matrix.Oil-lubricated sliding tests of ball-on-disc type were carried out for the as-DPD and the as-annealed DPD steel samples in comparison with coarse grained(CG) steel samples.Experimental results show that the as-DPD 316L steel exhibits a little enhanced wear resistance under a load of 10 N,and nearly identical wear resistance under a load of 30 N relative to that of the CG sample.After annealing,the wear resistance roughly follows the Archard equation under a load of 10 N.However,the wear resistance increases with increasing hardness,and decreases with a further increase in hardness under a load of 30 N.The highest wear resistance can be found in the DPD sample annealed at 750 C for about 20 min,which is more than 46% higher than that of the CG steel sample.This phenomenon is originated from the microstructure with an optimized combination of strength and ductility as a result of moderate plastic deformation in SRX grained regions.     

掺Ti／Cu中间相碳合金作为润滑油添加剂的减摩抗磨性能

采用机械合金化法将金属Ti、Cu掺杂到煤焦油沥青碳质中间相中,制备出掺Ti／Cu中间相碳合金。利用XRD分析产物的晶体结构,并测试产物作为润滑油添加剂的减摩抗磨性能,用SEM观察摩损表面的形貌。结果表明：机械合金化掺杂金属Ti、Cu后,中间相碳合金的结晶有序度下降;中间相碳合金作为润滑油的添加剂具有良好的高温减摩抗磨性能,且随着栽荷的增大,其减摩抗磨性能更加显著。     

导电用超细铜粉防氧化新技术研究

利用自制的防氧化剂对已氧化超细铜粉表面改性,研究了氧化层去除和包覆工艺。结果表明,以5%硫酸作为酸洗剂,防氧化剂浓度为0.1%~0.5%,反应温度为60℃时,铜粉红外反射谱图中有防氧化剂特征峰,XRD和XPS分析结果表明,所得铜粉表面不含氧化物,防氧化剂在铜粉表面生成一层厚度适中的保护膜,隔绝了铜粉与环境的接触,不影响导电性,并且该保护膜在150℃以下以及5%H2SO4、5%NaOH和5%NaCl溶液介质中稳定。     

系列奥氏体锰钢耐磨性研究

测定了系列锰钢的冲击磨粒磨损性能，发现在低冲击功下锰钢的耐磨性与磨面硬度近似线性关系，而在高冲击功下耐磨性几乎与磨面硬度无关。对冲击功、冲击韧性及耐磨性三者之间关系研究得出：当冲击韧性与冲击功比值在３０—７０范围内时锰钢具有较高耐磨性     

Fe-Cr-C-B堆焊合金耐磨性研究

采用铺粉堆焊方式,在低碳钢表面堆焊高碳铬铁和硼铁混合合金粉末,研究了Cr、C含量对Fe-Cr-C-B堆焊合金耐磨性的影响,结果表明,随着Cr、C含量的增加,硬度逐渐增加,磨损损失逐渐减少,耐磨性增强.本试验中,当Cr含量为31.67％、C含量为3.85％,B含量为0.4％时,磨损失重最小.硼对Fe-Cr-C-B合金耐磨...     

长效超疏水铜表面的构建及耐磨性和自清洁性能

改善超疏水表面的普适性、稳定性和耐磨性是超疏水材料实用化的前提。本研究通过水热反应和表面修饰成功制得接触角达156.2°、滚动角为3~4°的铜基超疏水表面。利用接触角测量、扫描电镜观察、XRD测试、红外光谱和EDS分析对超疏水铜表面的润湿性能、表面微结构、相结构和化学结构进行了分析表征。结果表明:所制备的超疏水表面是由大量Cu₂S晶粒堆积形成的微纳米二元结构及接枝的疏水长链构成,二者共同赋予铜基超疏水表面广泛的普适性和良好的稳定性。同时,该超疏水表面具有良好的耐磨性和优异的自清洁性能。本工作对此项性能产生的原因和机理进行了分析探讨,以期为超疏水材料在实际生产和生活中的应用奠定基础。     

纳米填料对环氧胶粘涂层强度及耐磨性的影响

研究了纳米填料(SiO2、有机蒙脱土)在环氧树脂胶粘剂中最佳含量,在此基础上研究不同填料对胶粘剂拉伸剪切强度、冲击弯曲强度和耐磨性的影响，推荐纳米填料环氧树脂胶粘剂最佳配方。     

铜合金表面热喷涂镍基合金层激光重熔后的显微组织及耐磨性能

为了满足工业领域铜合金传热、耐磨、耐腐蚀性能优异的要求,对铜合金表面先等离子喷涂NiCrFeWBC自熔合金层,再进行激光重熔.采用现代分析技术研究了重熔处理对涂层显微组织及耐磨性能的影响.结果表明:等离子喷涂NiCrFeWBC自熔合金涂层重熔后层状组织、孔洞等缺陷完全消失,激光熔覆层与铜基体为冶金结合,涂层致密、组织均匀;熔覆层由表及里依次呈等轴晶、树枝晶及胞状晶形貌,并有WC,W_2C,Ni_3B等颗粒析出;熔覆层磨损性能明显高于铜合金基体及热喷涂涂层,磨损机理为典型的磨粒磨损.     

二次调质离子渗氮工艺参数对35CrMo耐磨性的影响

文中通过对35CrMo进行热处理,采用一次调质＋亚温淬火＋回火＋离子渗氮的方法提高材料的耐磨性。采用不同的回火温度、渗氮温度和渗氮的N2和H2的比例,通过正交试验分析这些参数对渗氮层耐磨性能的影响,结果表明最佳的耐磨性渗氮工艺为回火的温度600℃、渗氮温度460℃、N2：H2为1：5;耐磨性最差的渗氮工艺为回火的温度650℃、渗氮温度540℃、N2：H2为1：1。通过XRD分析表明白亮层的组织为以γ′相为主,并含一定量的α-Fe（N）相。这样的组织有很好的耐磨性,并且具有较小的的脆性。     

TiN层微观结构对CVD TiC-TiCN-TiN多层涂层耐磨性能的影响

通过改变N2/H2体积比,采用化学气相沉积法在TiC-TiCN层表面制备了不同微结构的TiN层。研究了TiN层微结构对TiC-TiCN-TiN多层涂层耐磨性能的影响机制,同时对比研究了国产多层涂层与国外公司同类涂层产品在结构、硬度及耐磨性能方面的不同。结果表明,当N2/H2体积比为1.5∶1时,获得的TiC-TiCN-TiN多层涂层硬度最高,摩擦系数最小,且耐磨性能优于国外公司同类涂层产品。多层涂层的硬度以及摩擦过程中生成氧化层的减摩作用对其耐磨性能有重要影响。     

一种新型陶瓷材料及其耐磨性

对新型Ａｌ２Ｏ３－ＴｉＣ－Ｃｏ陶瓷的磨粒磨损，冲蚀磨损及其在单颗粒作用下的摩擦磨损行为进行了研究。与ＡＴ３０（７０ｗｔ％Ａｌ２Ｏ３－３０ｗｔ％ＴｉＣ）陶瓷相比，Ａｌ２Ｏ３－ＴｉＣ－Ｃｏ陶瓷具有更为良好的耐磨性，金属钴的存在提高了基体的韧性，细化了晶粒，其综合力学性能得到了显著提高，ＡＴＣ陶瓷样品耐磨性与其强韧化水平和细致的组织结构有关。     

A Study on the Wear Resistance of Nano-Material/E51

Epoxy resin modified by nanometric γ-alumina or multi-walled carbon nanotubes (MCNTs) was prepared with solution mixingmethod, and the wear resistance of the composite was studied. The results show that when an optimum amount of nanometricalumina or MCNTs is filled in epikote51 (E51), the wear resistance of the composite will increase. When 8 wt pct nanometricγ-alumina is filled in E51, the wear resistance of the composite increases to 230%. When 10% MCNTs is filled in E51, thewear resistance of the composite increases to 226%. When nanometric alumina is filled in, the wear resistance of modifiedepikote51 will increase as the cure temperature is heightened.     

IBAD制备非晶碳膜与CrN镀层的耐磨性能比较及机理分析

采用离子束辅助溅射沉积（IBAD）法，在高速钢基体上制备非晶碳膜（α—C）及CrN镀层，对两者的耐磨性能分析比较，并对其耐磨机理进行分析。结果表明：非晶碳膜的耐磨性能优于CrN镀层；文中讨论了摩擦系数和硬度对镀层耐磨损性能的影响，并通过分析动态膜基结合强度，证明两种镀层的磨损由不同磨损机理引起。     

Effects of Yttria Addition on Microstructure,Mechanical Properties,Wear Resistance and Corrosive Wear Resistance of TiNi Alloy

TiNi alloy has a high resistance to wear and could be an excellent candidate for various tribological applications. But studies show that oxygen active elements can improve properties of some alloys,markedly.Yttrium is one of the oxygen active elements.In this paper,the e-ects of yttria addition on properties of TiNi have been studied via micro-indentation,hardness,wear and corrosive wear tests.It is demonstrated that by addition of yttria to 5%,TiNi alloy can own improved mechanical properties and resistan...     

低温时效对6Mn2Cr钢耐磨性的影响

低温时效处理明显提高６Ｍｎ２Ｃｒ介稳奥氏体钢抗高冲击功的耐磨性，穆斯堡尔谱分析不韧处理试样的磨面诱发出无碳马氏体和合金马氏体。经低温时效处理试样的磨面为韧性罗合金奥氏体和无碳氏体两相组织，并在随后的磨损过程中产生的强烈的加工硬化，致使低温对时效处理试样的磨面兼有高韧性和高硬度。     

WC和Nb对氩弧熔覆Ni60+WC+Nb合金层组织和耐磨性的影响

采用氩弧熔覆工艺在4Cr13钢上分别熔覆Ni60、Ni60+WC和Ni60+WC+Nb系合金。比较各种材料熔覆层的显微组织、显微硬度和耐磨性。结果表明,材料的表面硬度和耐磨性等都随WC含量的增加得到很大地提高,而Nb含量的增加对硬度和耐磨性的影响不明显。     

B4C对铜基复合材料的力学性能与抗氧化性的影响

用粉末冶金的方法制备了含B4C的铜基复合材料,并研究了B4C加入量及其颗粒粗细对其力学性能与抗氧化性的影响.结果表明,加入B4C的含量(质量分数,下同)≤3%时,可提高材料的硬度、耐磨性,但影响材料的抗氧化性,加入B4C≤2%时,对抗氧化性的影响较小.所以B4C的加入量为2%时,对材料的整体性能影响最佳.B4C颗粒越细,材料的硬度越大,耐磨性越好,抗氧化能力越好.     

高强高导电铜合金耐蚀性研究

采用乙酸盐雾试验和电化学方法对Cu-Ag和Cu-Fe-P两种高强高导电铜合金的腐蚀行为进行研究。通过SEM,EDS和XRD等方法分析合金的腐蚀形貌及腐蚀产物的组成。研究表明:Cu-Fe-P合金比Cu-Ag合金有更好的耐蚀性能。微量Fe和P的同时加入,可以综合利用Fe的细化晶粒和P的脱氧作用,细化和净化合金组织,在提高合金强度和电导率的同时改善合金的耐蚀性。     

耐热合金与铜扩散焊的初步研究

本文对耐热合金与铜的扩散进行了初步研究。试验采用镍作中间层，钨作电极，主要研究了中间层厚度、焊接温度和保温时间对焊缝化学成分以及剪切钱其的影响，最后确定了合适的扩散焊接参数为：焊接温度１２４３Ｋ，保温时间２０ｍｉｎ，焊接压力１０ＭＰａ，真空度６．６×１０（－３）Ｐａ，中间层厚度２μｍ。     

Effects of Mo and Zr on Microstructure, Mechanical Properties and Wear Resistance of Fe-Al Based Alloys

In this work the microstructure, mechanical properties and wear resistance of Fe-Al based alloys with various alloying elements were studied. The microstructures were examined by optical and scanning electron microscopy （SEM） equipped with an energy dispersive X-ray spectroscope （EDS）. Two types of alloys were prepared by vacuum arc melting. One is Fe-28Al based alloys （D03 structured） with and without alloying elements such as Mo and Zr. The other one is Fe-35Al based alloys （B2 structured） produced with the same manner. For both types of alloys, Mo addition had found to exhibit an equiaxed microstructure, while dendritic structure was observed to show the effect of Zr addition. These microstructural features were more evinced with increasing content of alloying element. Concerning the mechanical properties and wear resistance, Fe-35Al based alloys were superior to Fe-28Al based alloys over the whole temperature range investigated.