不同钎料对TiAl基合金与40Cr钎焊接头强度的影响

TiAl基合金是一种具有广泛发展前途的结构材料,采用钛基钎料和银基钎料对TiAl基合金与40Cr钢进行了真空钎焊试验。接头的剪切强度分别为110MPa和105MPa。显微组织分析表明,采用Ti基钎料时焊接区域存在脆性金属间化合物Ti-Cu相和Ti-Ni相以及采用Ag基钎料时产生的层状组织可能与接头的低强度有关。     

填充泡沫Ti/AlSiMg的SiC陶瓷钎焊接头的组织与性能

为丰富SiC陶瓷钎焊所用钎料的设计思路,提出了一种泡沫Ti/AlSiMg新型复合钎料,通过Ti元素的溶入提高钎料与SiC陶瓷之间的界面结合力,利用泡沫Ti与Al基钎料之间的界面反应获得原位增强的钎缝,从而提升接头力学性能. 采用钎焊温度700 ℃、保温时间60 min和焊接压力10 MPa进行SiC陶瓷真空钎焊,利用光学显微镜、扫描电镜、能谱分析、X射线衍射、电子探针和万能试验机对接头组织、成分和性能进行分析,探索泡沫Ti/AlSiMg复合钎料在SiC陶瓷钎焊中的可用性. 结果表明,填充泡沫Ti/AlSiMg复合钎料所得接头结构为SiC/Al/Ti(Al,Si)₃/Ti(Al,Si)₃原位增强Ti基钎缝/ Ti(Al,Si)₃/Al/SiC,断裂发生在铝合金界面层和SiC陶瓷之间,Ti元素的溶入提高了铝合金界面层与SiC陶瓷之间的界面结合力,接头抗剪强度达111 MPa.     

SiC陶瓷与TiAI合金的真空钎焊

采用Ag-Cu-Ti钎料对常压烧结的SiC陶瓷与TiAl金属间化合物进行了真空钎焊,并对接头的微观组织和室温强度进行了研究。结果表明,利用Ag-Cu-Ti钎料可以实现SiC与TiAl的连接;接头界面具有明显的层状结构,即由Ti-Cu-Si合金层、富Cu相与富Ag相的双相层和Ti-Al-Cu合金层组成;在1173K和10min的钎焊条件下,接头室温剪切强度达到173MPa。     

Invar合金与Si_3N_4陶瓷钎焊接头界面组织和性能研究

采用Ag Cu Ti活性钎料对Invar合金和Si3N4陶瓷进行钎焊连接,研究了接头界面组织及其形成机制,分析了钎焊工艺参数对接头界面结构和性能的影响。结果表明,钎焊过程中液态钎料中的活性元素Ti与Si3N4陶瓷发生反应,在陶瓷界面形成致密的Ti N和Ti5Si3反应层;同时,Invar合金向液态钎料中溶解,与活性元素Ti反应生成脆性的Fe2Ti和Ni3Ti化合物。钎焊温度和保温时间影响Si3N4陶瓷界面反应层的厚度以及接头中Fe2Ti和Ni3Ti脆性化合物的形成量和分布,这两方面共同决定着接头的抗剪强度。当钎焊温度为870℃,保温15 min时,接头的平均抗剪强度最大值达到92.8 MPa,此时接头的断裂形式呈现沿Si3N4陶瓷基体和界面反应层的复合断裂模式。     

Joining of C<Subscript>f</Subscript>/SiC Ceramics to Nimonic Alloys

C_f/SiC ceramic composites have been brazed to Nimonic alloys using TiCuAg filler metal. In order to improve wettability and to provide compatibility between ceramic and metal, the C_f/SiC surface was metallized through the deposition of a chromium layer. Subsequent heat treatments were carried out to develop intermediate layers of chromium carbides. Excellent wetting of both the composite ceramic and the metal from the filler metal is observed in the fabricated joints. Shear tests show that failure occurs always within the ceramic material and not at the joint. In the filler region depletion of Ti and formation of Ag and Cu rich regions are observed. At the C_f/SiC-filler interface a layered structure of the filler metallic elements is observed. Titanium interacts with the SiC matrix to form carbides and silicides.     

EFFECT OF Ti CONTENT ON THE MICROSTRUCTURE AND PROPERTIES OF Si_3n_4/Si_3N_4 JOINT BRAZED USING Cu-Zn-Ti ALLOY

1.IntroductionWiththedevelopmentofaerospace,energyandelectronicindustries,advancedmaterialsarebecomingmoreandmoreimPOrtant.CerdricmaterialshavevariousadVantagessuchashighthermalresistance,corrosionresistanceandwearresistance,whichcansatisfymanyindustryreqUirements.However,becauseOfthehighbrittlenessandPOOrmachiningproperties,cerawhcmaterialsisverydifficulttobeusedasthestructurecomponentswithlargesizeorcomplicatedshapes.Therefore,weldingofceradricmaterialsisoneofthekeytechniqUesfortheirappl…     

Ni-Ti 钎料高温钎焊TZM晶间渗入行为研究

采用SEM,EDS,XRD和力学试验机等分析测试方法,研究了Ni-Ti钎料对TZM合金钎缝组织和性能的影响。结果表明：Ni-Ti钎料可实现TZM的高温真空钎焊连接。Ni-13.7Ti/TZM界面区,母材中的Mo与钎料中的Ni形成MoNi相,是钎料与TZM形成冶金结合的主要原因。TZM/Ni-44Ti/TZM界面区Ni-44Ti钎料中的Ti与Mo反应,Mo-Ti固溶体,使钎料和TZM形成冶金结合。Ni-44Ti钎料钎焊TZM合金产生严重晶间渗入现象。降低钎料中Ti的含量,晶间渗入和母材溶蚀现象大幅减弱;TZM/Ni-13.7Ti/TZM钎焊接头剪切强度193MPa,TZM/Ni-44Ti/TZM钎焊接头剪切强度167MPa,晶间渗入使钎缝强度降低,降低钎料中的Ti含量,钎焊接头强度提高。     

Ti含量对Ni-14Cr-10P-xTi焊膏连接C/C复合材料组织及性能的影响

将不同质量分数的钛粉加入Ni-14Cr-10P合金粉末中,再配合高分子聚合物制得膏状Ni-14Cr-10P-x Ti活性钎料,用制得的焊膏钎焊C/C复合材料,然后测试了钎焊接头的剪切强度,通过扫描电子显微镜、能谱分析仪、电子探针显微分析仪等对钎焊接头界面组织特征进行分析。结果表明:活性元素Cr、Ti与C/C复合材料表面的C反应而起到表面改性的作用,使得钎料能在C/C复合材料表面润湿、填缝。随着Ti元素加入量的增加,钎焊接头剪切强度先增加再降低。Ti质量分数为1%时,TiC呈颗粒状弥散分布,使得钎料层强化,接头剪切强度增加;当Ti增加到3%时,在界面处形成了连续的Cr_3C_2/TiC脆性材料层,接头剪切强度下降;Ti质量分数达到5%时,Ti与Cr_3C_2反应使得梯度界面层消失,界面物质热膨胀系数差异增大,残余热应力增加,同时Ti与Ni、Cr形成的金属间化合物增加并集中分布在钎料层中,导致接头剪切强度急剧下降。     

Effect of Ti content in Ag–Cu–Ti activated filler metal on dissimilar joint formation of sialon and WC–Co alloy by laser brazing

Laser brazing was carried out for dissimilar joining of sialon and a WC–Co alloy. Eutectic type Ag–Cu alloys as filler metals with different Ti content ranging from 0 to 2·8 mass-% were used to investigate the effects of Ti on the interface structure and strength of the joint. The filler metal sheet was sandwiched between a sialon block and a WC–Co alloy plate, and a laser beam was irradiated selectively on the WC–Co alloy plate. The brazed joint was obtained using the filler metal containing >0·3 mass-%Ti. TiN, Ti₅Si₃, and Cu₄Ti layers were formed at the interface of sialon and brazed metal as compound layers. The shear strength of the brazed joint increased with increasing Ti content in the filler metal in the range 0·3–1·7 mass-%, reaching a maximum value of 106 MPa. However, the strength decreased when the Ti content became higher than 1·7 mass-%.     

Effect of bonding parameters on microstructure and properties of Si_3N_4/Si_3N_4 joint brazed by Cu-Zn-Ti filler alloy

1INTRODUCTION Si3N4ceramichashighthermalandwearingresistanceandisapromisingmaterialforhightem peratureapplications.However,itisdifficultto manufacturetheSi3N4ceramicworkpieceswithla gerdimensionsandcomplicatedshapesduetoitspoorworkabilityandlowductility.Inrecent20years,manystudieshavebeenfocusedonthetech niquesofceramicjoining,becausethejoiningtech niquescanbeusednotonlyforlow costandhigh reliabilitymanufacturingofceramicpartswith complicatedshapesbutalsoforrepairingofthece ramicpartsinw…     

Microstructure and strength of brazed joints of TiB2 cermet to TiAl-based alloys

In this study, TiB2 cermet and TiAl-based alloy are vacuum brazed successfully by using Ag-Cu-Ti filler metal.The microstructural analyses indicate that two reaction products, Ti ( Cu, Al ) 2 and Ag bused solid solution ( Ag ( s. s ) ) , are present in the brazing seam, and the iuterface structure of the brazed joint is TiB2/TiB2 Ag ( s. s ) /Ag ( s. s ) Ti ( Cu,Al)2/Ti( Cu, Al)2/TiAl. The experimental results show that the shear strength of the brazed TiB2/TiAl joints decreases us thebrazing time increases at a definite brazing temperature. When the joint is brazed at 1 223 K for 5 min, a joint strength up to 173 MPa is achieved.     

SiO2玻璃陶瓷与TC4钛合金的活性钎焊

分别采用活性钎料AgCuTi和TiZrNiCu对SiO2陶瓷和TC4钛合金进行了钎焊连接,使用扫描电镜和X射线衍射等手段对接头的界面组织和力学性能进行了研究.结果表明,采用两种钎料均能够实现对SiO2陶瓷和TC4钛合金的连接;SiO2/TiZrNiCu/TC4接头的典型界面为SiO2/Ti2O+Zr3Si2+Ti5Si3/(Ti,Zr)+Ti2O+TiZrNiCu/Ti基固溶体/TiZr-NiCu+Ti基固溶体+Ti2(Cu,Ni)/TC4;SiO2,AgCuTi/TC4接头的典型界面为SiO2/TiSi2+Ti4O7/TiCu+Cu2Ti4 O/Ag基固溶体+Cu基固溶体/TiCu/Ti2Cu/Ti+Ti2 Cu/TC4.当钎焊温度为880℃和保温时间为5 min时,SiO2/TiZrNiCu/TC4接头的最高抗剪强度为23 MPa;当钎焊温度为900℃和保温时间为5 min时,SiO2/AgCuTi/TC4接头的最高抗剪强度为27MPa.     

Brazing C/SiC composites and Nb with TiNiNb active filler metal

Abstract

C/SiC composites and Nb were vacuum brazed with the Ti_39·4Ni_39·4Nb_21·2 alloy being the active filler metal. The mechanical properties of the filler material, the microstructure and the strength of brazing joints were investigated. The results showed that the filler TiNiNb alloy has a tensile strength of 860?MPa, an elongation of 51% and an elastic modulus of 78?GPa. Both Ti and Nb elements in the filler reacted with C/SiC during the brazing process, and a well bonded C/SiC–Nb joint was obtained. The ductile filler metal released the thermal stress in the joint. When the brazing was performed at 1220°C for 20?min, the shear strength of brazed joints reached 149, 120 and 73?MPa at 20, 600 and 800°C respectively.     

Effect of parameters on interface of the brazed ZrO2 ceramic and Ti-6Al-4V joint using Ti-based amorphous filler

A commercially available Ti47 Zr28 Cu14 Ni11 (at. pct) amorphous filler foil was used to join ZrO2 ceramic and Ti-6Al-4V alloy. According to experimental observations, the interface microstructure accounts for the mechanical properties of the joints. The effects of brazing conditions and parameters on the joint properties were investigated. The joint shear strength showed the highest value of about 108 MPa and did not monotonously increase with the brazing time increasing. It was shown that decreasing of brazing cooling rate and appropriate filler foil thickness gave higher joint strength.     

TiAl基合金与Ti合金的真空钎焊

采用Ag-Cu钎料与Ti-Zr-Ni-Cu钎料,对TiAl与Ti合金进行了真空钎焊试验,主要研究了采用两种钎料时的界面反应以及钎焊温度对界面组织及性能的影响.研究发现,采用Ag-Cu钎料时界面结构为:Ti/Ti(Cu,Al)2/TiCux Ag(s,s)/Ag(s,s)/Ti(Cu,Al)2/TiAl,当钎焊温度T=1 223 K,保温时间t=10 min时接头的剪切强度达到223.3 MPa;采用Ti-Zr-Ni-Cu钎料时在界面出现了Ti2Ni,Ti(Cu,Al)2等多种金属间化合物,当钎焊温度T=1 123 K,保温时间t=10 min时接头的剪切强度达到139.97 MPa.     

Behaviors of interfacial elements during the brazing of SiO2 glass ceramic to Ti-6Al-4V with AgCu/Ni interlayer

AgCu/Ni composite interlayer was used to join SiO₂ glass ceramic to Ti-6Al-4V alloy successfully, obtaining the largest joint shear strength 110MPa. Ag, Cu and Ni in the interlayer and Ti in the Ti-6Al-4V alloy affect the joint formation and interfacial products significantly. To understand the joint formation process better, behaviors of elements Ag, Cu, Ni and Ti during the brazing of SiO₂ glass ceramic to Ti-6Al-4V alloy were investigated in the present work. Active element Ti is the most important component in the joining, realizing the metallurgical bonding of SiO₂ glass ceramic to braze alloy. Cu together with Ni reacts to Ti in the base material by Ti-Cu-Ni ternary eutectic reaction, which is beneficial for reducing the massive Ti-Cu and/or Ti-Ni brittle intermetallic compounds on the joint interface. Dispersion of Ag decreases the brittleness of the whole joint effectively.     

Effects of Ti on the Brazability of Zn-22Al-xTi Filler Metals as Well as Properties of Cu/Al Brazing Joints

设计并采用Zn-Al-Ti系列钎料对Cu和Al异种金属实施了钎焊,并对Zn-22Al-xTi/Cu界面处的相组成和金属间化合物形貌进行了分析。结果表明：在Zn-22Al中添加0.01%至0.05%的Ti可以显著细化钎料组织,而且Zn-22Al-0.03Ti在Cu基板上的铺展面积比Zn-22Al高出60.4%,但Ti的添加会提高Zn-22Al钎料的熔点和熔化区间。另外,在钎料中添加微量的Ti可以优化Cu/Al接头中Cu侧界面化合物的组织并减小其厚度。相比Zn-22Al钎料,Zn-22Al-0.03Ti钎焊所得Cu/Al接头强度要高出13.4%,而且接头断裂位置由化合物层转移至钎料内部。X射线衍射结果显示,钎焊过程中有CuAl2,Cu9Al4,CuZn 3种化合物产生于钎料与Cu基板界面处     

Sn改性Ti-Zr-Cu-Ni钎料的微观组织和力学性能

采用自制Ti-Zr-Cu-Ni-Sn钎料钎焊TA2钛合金,研究了不同Sn元素含量改性Ti-Zr-Cu-Ni钎料的熔化特性、微观组织及物相、润湿及熔蚀性、接头拉伸强度。研究表明,Sn含量增加,Ti-Zr-Cu-Ni-Sn钎料固、液相线温度基本升高,但温度差值基本变窄,可更好地抑制钎焊界面脆性化合物形成。Ti-Zr-Cu-Ni-5Sn钎料组织由Ti、Zr基体和晶体相构成,Sn倾向与Ti、Zr结合形成Ti₂Sn₃、Ti₆Sn₅、Zr₅Sn₃等低熔点共晶相。Sn≤1.5%时,随Sn含量增加,钎料对TA2钛合金的润湿性逐渐变差;继续增加Sn,钎料润湿性改善,添加5%Sn的钎料对基体润湿最佳。添加5%Sn并降低Cu、Ni总量的改性钎料对TA2钛合金熔蚀减弱。相同钎焊工艺下,添加5%Sn接头的强度和塑性均有提升。钎焊温度升高,Ti-Zr-Cu-Ni钎料产生更多强化物相,致接头强度大幅提升,而Ti-Zr-Cu-Ni-5Sn钎料产生的含Sn物相强化作用对接头强度提升有限;相...     

Ag-Cu-Ti合金制备技术及钎焊应用综述

介绍了Ag-Cu-Ti活性钎料的主要制备方法,常用的Ag-Cu-Ti活性钎料及熔化温度,Ag-Cu-Ti钎料钎焊各种陶瓷与陶瓷或陶瓷与金属,Ag-Cu-Ti活性钎料钎焊金刚石、石墨、玻璃、立方氮化硼、复合材料的应用研究进展及Ag-Cu-Ti活性钎料的改性研究。     

新型含钯镍基钎料钎焊不锈钢接头的性能分析

对新型Ni-Pd-Ag-Cr-Si钎料钎焊1Cr18Ni9Ti不锈钢的接头性能进行了分析。结果表明,新型Ni-Pd-Ag-Cr-Si钎料对1Cr18Ni9Ti不锈钢有良好的润湿性;钎焊接头中,紧靠钎缝与母材界面的是与该界面平行的长条形齿状镍钯基固溶体致密组织。这种固溶体具有较高的强度和塑性,钎缝宽度为170μm时,钎缝仍具有较高的剪切强度,利于保证钎焊不锈钢产品质量不发生重大变化。