Microstructure and mechanical properties of Al 2 O 3 ceramic and Ti6Al4V alloy joint brazed with inactive Ag–Cu and Ag–Cu + B

Qiu, Qiwen; Wang, Ying; Yang, Zhenwen; Wang, Dongpo

doi:10.1016/j.jeurceramsoc.2016.02.033

Cited by 68 publications

(20 citation statements)

References 22 publications

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“…Another way leading to the reduction of TiCu 4 layer is the growth of TiC on graphite. As TiC is far more thermodynamically stable than TiCu 4 (ΔG TiCu4 = −7600 + 3.12 T J/mol 20 ), the Ti atoms required for growth of TiC nearly all come from dissolving of TiCu 4 (TiCu 4 → Ti + 4Cu). Figure 4 shows that, with extension of holding time, the thickness of TiC layer gradually increases while the boundary of TiCu 4 layer recedes, leaving a narrow Cu ss layer as a decomposition product between TiCu 4 and TiC.…”

Section: Resultsmentioning

confidence: 99%

Degradation kinetics of Ti-Cu compound layer in transient liquid phase bonded graphite/copper joints

Lin

Huang

Yang

et al. 2018

Sci Rep

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The continuous Ti-Cu compound layer produced in brazing of graphite to copper with Ti foil is found to be seriously detrimental to joint properties due to its brittleness. In this work, a transient liquid phase (TLP) bonding method with a diffusion process below melting point is developed to realize a Ti-Cu compound layer free joint. The degradation of Ti-Cu compound layer depends on two simultaneously occurring processes, namely flow of titanium atoms to copper substrate and that to TiC layer on graphite. The latter is determined by growth kinetics of TiC layer based on carbon diffusion process. A degradation model is proposed and applied to optimize the TLP bonding. The improved graphite/copper joints without Ti-Cu compound layer show 20.8% higher in shear strength compared with that of brazing joints.

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Section: Resultsmentioning

confidence: 99%

Degradation kinetics of Ti-Cu compound layer in transient liquid phase bonded graphite/copper joints

Lin

Huang

Yang

et al. 2018

Sci Rep

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“…The development of reliable joining of Al 2 O 3 to metals is crucially important to extend their use, particularly in aerospace and nuclear applications [63]. For instance, reliable bonding of titanium alloys, such as TiAl [22][23][24] or Ti6Al4V [25,26], or even steel [64] and Al 2 O 3 , can take advantage of the respective superiorities of ceramics and metals, and thereby extend their scopes of application.…”

Section: Brazing Of Titanium Alloys To Aluminamentioning

confidence: 99%

“…The addition of W particles on the composite filler seems to act as a release of residual stresses formed during cooling. The increase of the brazing temperature led to an increase of the thickness of the reaction layers composed by Ti 3 (Cu,Al) 3 alloys, such as TiAl [22][23][24] or Ti6Al4V [25,26], or even steel [64] and Al2O3, can take advantage of the respective superiorities of ceramics and metals, and thereby extend their scopes of application. The fundamental problem of brazing an oxide ceramic is a resistance to wetting by the presence of the oxides on the surface.…”

Section: Brazing Of Titanium Alloys To Aluminamentioning

confidence: 99%

“…The highest shear strength value of 77.9 MPa was obtained for joints processed with the brazing alloy with 40 vol% TiB whiskers. Qiu et al [26] explored also the influence of the presence of B but in an Ag-Cu brazing filler on the dissimilar joining between the Ti6Al4V alloy to Al2O3 ceramic. The brazing experiments were carried out from 840 to 920 °C for 10 min in a vacuum furnace.…”

Section: Brazing Of Titanium Alloys To Aluminamentioning

confidence: 99%

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Recent Progress in the Joining of Titanium Alloys to Ceramics

Simões

2018

Metals

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The prospect of joining titanium alloys to advanced ceramics and producing components with extraordinary and unique properties can expand the range of potential applications. This is extremely attractive in components for the automotive and aerospace industries where combining high temperature resistance, wear resistance and thermal stability with low density materials, good flowability and high oxidation resistance is likely. Therefore, a combination of distinct properties and characteristics that would not be possible through conventional production routes is expected. Due to the differences between the coefficients of thermal expansion (CTE) and Young's modulus of metals and ceramics, the most appropriate methods for such dissimilar bonding are brazing, diffusion bonding, and transient liquid phase (TLP) bonding. For the joining of titanium alloys to ceramics, brazing appears to be the most promising and cost-effective process although diffusion bonding and TLP bonding have clear advantages in the production of reliable joints. However, several challenges must be overcome to successfully produce these dissimilar joints. In this context, the purpose of this review is to point out the same challenges and the most recent advances that have been investigated to produce reliable titanium alloys and ceramic joints. for next-generation aircraft turbine engines [1][2][3][4]. Though, the development of bonding techniques especially to successfully produce dissimilar joints is the key to overcoming the poor room-temperature ductility and fracture toughness of these alloys that limit these potential applications.The possibility of combining the extraordinary properties of these titanium alloys with other materials such as nickel-based superalloys, steel, or even ceramics through dissimilar bonding can allow the development of components not only with complex geometries but also with a combination of properties exceeding the limitations of these materials when used individually.Advanced ceramics have attractive properties, such as high wear resistance, high thermal stability as well as high thermal and electrical conductivities. It is known that some of the advanced ceramics like alumina, silicon nitride, and zirconia, are also well established in the electronics, aerospace, nuclear, and automotive industries [19,20]. However, their inherent brittleness, high cost, and high hardness limit the production of large and complex shape components. The successful application of these advanced ceramics depends strongly on the joining of these materials with metals. In addition, the possibility to combine properties as high wear resistance and high thermal stability with low density, high temperature properties, and excellent creep and corrosion resistance could enable the production of more advanced components that better meet the high requirements of several industrial sectors [21].The most suitable methods for bonding metals and ceramics and producing successful joints with appreciated properties are brazing , diffusion bonding...

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“…A basic problem for the processing of titanium alloys is the reaction with interstitial elements including oxygen, nitrogen and carbon causing their embrittlement [1,2]. The dissolution of interstitial elements is also one of the main reaction mechanisms of titanium alloys with oxide and non-oxide ceramics [3,4], which significantly affects casting, melting, machining and joining of titanium alloys [3,[5][6][7][8][9]. The severest interaction occurs due to kinetics generally during melting and casting [10], which has been motivating the development of corrosion resistant refractories since the early days of titanium metallurgy.…”

Section: Introductionmentioning

confidence: 99%

Reactions of alkaline earth zirconate refractories with titanium alloys

Schafföner¹

2020

MATEC Web Conf.

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The severe reactivity of titanium alloys with ceramics is a major challenge for their processing. Up to now refractories to melt and cast titanium alloys are selected on the basis of a low Gibbs energy of formation. This kind of selection assumes that an oxide should be stable if its Gibbs energy of formation is lower than the one of any titanium (sub)oxide. The present contribution reviews that these models trying to explain the stability of ceramic materials in contact with titanium alloys are often misleading. By contrast, a dissolution and evaporation based reaction model is more appropriate to describe the reaction of high temperature ceramics with titanium alloys. These explanations were exemplified by research findings of high temperature reactions of titanium alloys with calcium oxide and yttrium oxide. Based on the discussion on calcium and yttrium oxide, the reactions of alkaline earth zirconates such as calcium and barium zirconate with titanium alloys were discussed. The reaction of alkaline earth zirconates is also highly dependent on the titanium alloy composition. It was also demonstrated that not only thermodynamics but also kinetics should be considered to evaluate refractories for titanium processing.

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Microstructure and mechanical properties of Al 2 O 3 ceramic and Ti6Al4V alloy joint brazed with inactive Ag–Cu and Ag–Cu + B

Cited by 68 publications

References 22 publications

Degradation kinetics of Ti-Cu compound layer in transient liquid phase bonded graphite/copper joints

Degradation kinetics of Ti-Cu compound layer in transient liquid phase bonded graphite/copper joints

Recent Progress in the Joining of Titanium Alloys to Ceramics

Reactions of alkaline earth zirconate refractories with titanium alloys

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