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Al2O3/(Ag72Cu28)97Ti3/Ti-6Al-4V界面反应 总被引:2,自引:0,他引:2
在1.8 ks、1 073~1 173 K条件下对Al2O3/(Ag72Cu28)97Ti3/Ti-6Al-4V进行了钎焊试验。通过扫描电镜、波谱、能谱和X射线衍射对界面反应产物进行了测试,确定了界面结构,并讨论了这些反应产物形成的可能性。结果表明,温度小于1 123 K的界面结构为Al2O3/Cu2Ti4O/Cu4Ti3+Cu固溶体/Ag-Cu共晶 + 富Ag相;温度1 173 K的界面结构为Al2O3/Cu3TiO5 + CuAl2O4/Cu4Ti3/富Ag相+ Cu4Ti3。 相似文献
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在TiAl合金中添加过渡族合金元素,观测了其微观组织和结构,测定了室温弯曲性能和高温氧化性能,研究了改善塑性及提高其高温氧化抗力的因素。试验结果表明,与单相γ-TiAl不同,添加过渡族元素Cr、Nb的Ti-48Al-2Cr-2Nb钛铝化合物所形成的双相或等轴γ和α2/γ片层状双态组织,改善了脆性γ-TiAl合金的室温塑性,使弯曲强度达490MPa,弯曲挠度为0.39mm;;大量层错带和变形孪晶的形成是室温变形的主要机制。另外,在高温下,钛铝化合物的表面由表及里形成了不易剥落的TiO2、Al2O3及TiO2+Al2O3三层氧化层,连续、致密的Al2O3层是提高氧化抗力的重要原因 相似文献
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(1 4 ) 5Cr4Mo3SiMnVAl钢 ( 0 1 2Al)5Cr4Mo3SiMnVAl钢系属基体钢 ,是一种空冷硬化型的热作和冷作模具兼容的钢种 ,已列入GB12 99标准。该钢也是在 4Cr3Mo3V钢的基础上重新调整合金元素 ,添加Si、Mn、Al等元素进一步合金化。与 3Cr2W 8V钢相比不含钨 ,但钼、铬、锰、钒、硅及铝的含量明显提高。 5Cr4Mo3SiMnVAl钢6 0 0~ 10 0 0℃的抗氧化性、80 0℃和 910℃的热磨损性能、保持 35HRC的热稳定性以及 75 0℃的高温硬度均优于 3Cr2W 8V钢。同样 ,其室温拉伸强度、6 0 0~ 10 0 … 相似文献
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本文利用电镀的方法,在热作模具钢4Cr5MoVSi上镀上一层有一定厚度的金属及金属基复合镀层,Co;Co+Cr2O3;Co+Si3N4。而后进行20-700℃之间冷,热循环试验。结果表明,镀Co+Si3N4能降低钢的热疲劳抗力。 相似文献
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10Cr4NiMo4V钢是一种新型高温渗碳轴承钢,它是高温、高速条件下工作的航空发动机主轴轴承的理想材料。试验表明,10Cr4Ni4Mo4V钢渗碳层基体组织主要为孪晶马氏体;析出相(碳化物)主要有M23C6,V4C3和Cr7C3三种结构类型。附图5幅,表1个,参考文献2篇。 相似文献
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利用Al与Cr2O3间的自蔓式燃烧合成工艺在室温下的空气中制备Cr+Al2O3金属陶瓷复合材料,并对其组织结构特征及形成过程进行了分析。结果表明,Cr+Al2O3金属的组织是由Cr和Al2O3两相呈柱状交替分布组成的;试样中存在一定数量的孔洞,其数量和尺寸可通过控制合成反应结束后加压的时间和压力的大小、提高反应物压坯的密度、改善Cr和Al2O3两相的湿润性等得到解决。 相似文献
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刀具材料的回顾与展望(下) 总被引:1,自引:0,他引:1
3.陶瓷陶瓷刀具材料分为3类:1)氧化铝基陶瓷 一般在Al2O3基体中加入TiC、WC、SiC、TaC、ZrO2等成分,经热压制成复合陶瓷。硬度达HRA93~95,抗弯强度达0.7~0.9GPa。为提高韧性,常添加少量的Co、Ni等金属。2)氮化硅基陶瓷 常用的是Si3N4+TiC+Co的氮化硅基复合陶瓷,其韧性常高于Al2O3基陶瓷,硬度相当。3)复合氮化硅—氧化铝陶瓷 其化学成分为Si3N477%,Al2O313%,Y2O310%,硬度可达HV1800,抗弯强度可达1.20GPa。这种陶瓷… 相似文献
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基体负偏压对CrAlN涂层组织和性能的影响 总被引:1,自引:0,他引:1
采用真空多弧离子镀技术,使用Cr30Al70(原子分数)复合靶,在不同的基体负偏压下,在不锈钢基体上制备了一系列CrAlN涂层;采用能谱仪、X射线衍射仪、扫描电子显微镜、粗糙度仪、显微硬度仪、摩擦磨损试验机和划痕仪等系统分析了涂层的成分、表面形貌、相结构、粗糙度、显微硬度、摩擦磨损性能和界面结合性能。结果表明:随着负偏压的增大,涂层中x(Cr)/x(Cr+Al)的比值先增大后减小,当负偏压为150V时,该值达到最大,并与靶材成分接近;基体负偏压为200V时,涂层的表面粗糙度最大,涂层结晶度、硬度最佳,晶体相为固溶铬的面心立方AlN;涂层的摩擦磨损性能不仅与涂层的表面粗糙度相关,还与涂层非晶相中铝元素的含量以及涂层的内应力大小密切相关;界面过渡层制备工艺相同时,基体偏压对涂层和基体之间的界面结合性能影响较小。 相似文献
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激光处理冷轧Q235/40Cr干摩擦试验研究 总被引:5,自引:0,他引:5
采用CO2横流式激光器对Q235/40Cr材料进行表面强化处理。使用S-360型扫描电镜观察激光硬化区金相组织及成分并观察表面磨损形貌,采用CHX-1超显微硬度计测量激光强化区断面的显微硬度。通过40Cr与冷轧Q235配副进行干摩擦试验,结果表明,与淬火40Cr配副的Q235的平均磨损速率最小,而与1400 W激光功率处理40Cr配副的Q235的平均磨损速率最大,淬火的40Cr平均磨损速率是激光处理的2~3倍。40Cr磨损为磨粒磨损并有微裂纹产生,Q235以磨粒磨损为主,表面产生较深的犁沟。经激光硬化处理后40Cr的耐磨性要优于正常淬火40Cr的耐磨性。 相似文献
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Yanbin Chen Shuhai Chen Liqun Li 《The International Journal of Advanced Manufacturing Technology》2009,44(3-4):265-272
A rectangular spot laser welding–brazing method was developed to join butted Ti/Al dissimilar alloys. In order to evaluate effects of heat input on mechanical property of the joints, microstructure of the joints were characterized. TiAl3 intermetallic compounds (IMCs) were found at the joint interface in the case of low-heat input and TiAl3, TiAl, Ti5Si3, and Ti3Al IMCs were observed at high-heat input. Results of tensile test showed that the joints fracture in the fusion zone under the condition of low-heat input and in the interfacial reaction layer or the fusion zone with a mass of porosities at high-heat input. In addition, tensile strength of specimens broken at the fusion zone is higher obviously than that at the interface or the fusion zone with a mass of porosities, and tensile strength of the joints is up to 290 MPa. 相似文献
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探讨了SiCp/Al复合材料脉冲氩弧焊过程中合金元素Ti发生诱发反应的可行性。结果表明,焊接时,Ti的加入有利于避免SiC/Al之间发生界面反应;接头拉伸实验、显微硬度测试和金相组织观察表明,接头性能良好;X射线衍射相结构分析显示,接头焊缝金属中大致含有Al, TiC, Si, Ti, SiC等组成相。文中对Ti元素发生诱发反应的机理,以及对提高接头性能的作用进行了讨论。 相似文献
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A duplex treatment involving nitrogen ion pre-implantation and gradient interfacial transition was performed to obtain a high-performance
graphite-like carbon (GLC) coating on a Ti6Al4V alloy. Characteristics of the as-deposited coating systems were systemically
investigated by Raman spectrometry, scanning electron microscopy, atomic force microscopy, nano-indentation, and scratch tests.
The friction and wear behaviors in distilled water and sea water environments were evaluated by a ball-on-disk tribometer.
The results showed that the GLC multilayer coating on nitrogen ion-implanted Ti6Al4V possessed a greater hardness and adhesion
strength than to that on un-implanted Ti6Al4V. The tribological performances of these duplex process systems showed a great
improvement in both the distilled water and sea water environments. In particular, the Cr/CrN/GLC coatings on nitrogen ion-implanted
substrates demonstrated the best friction and wear behaviors. These striking improvements were attributed to the greatly enhanced
interface strength between substrate and coating by the nitrogen ion implantation process and improved adhesion strength between
gradient layers by the appropriate gradient interlayers with a similar thermal expansion coefficient. 相似文献
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Wei Shouzheng Li Yajiang Wang Juan Liu Kun Zhang Pengfei 《The International Journal of Advanced Manufacturing Technology》2014,70(5-8):1137-1142
Butt joining of titanium alloy Ti–2Al–Mn to aluminum 1060 using AlSi5 filler wire was conducted using pulsed gas metal arc welding. Joining mechanism of Ti–2Al–Mn/Al 1060 dissimilar joint with different welding heat input was investigated. Formations of precipitation and Ti/Al interface were discussed in detail. Fusion zone near aluminum is composed of α-Al dendrites and Al–Si hypoeutectic structures. A few TiAl3 precipitations appear in the weld metal owing to metallurgical reactions of Al with dissolved Ti. When the welding heat input was in the range of 1.87–2.10 kJ/cm, titanium alloy Ti–2Al–Mn and Al 1060 were joined together by the formation of a complex Ti/Al interface. With a low welding heat input, a serrate TiAl3 interfacial reaction layer was formed near Ti/Al interface. With the increasing of the welding heat input, α-Ti, Ti7Al5Si12, and TiAl3 layers were formed orderly from Ti–2Al–Mn to weld metal. 相似文献
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