Microstructure and mechanical properties of Al2O3/TiAl joints brazed with B powders reinforced Ag-Cu-Ti based composite fillers

Niu, Guodong; Wang, D.P.; Yang, Zhenwen; Wang, Y.

doi:10.1016/j.ceramint.2016.09.178

Cited by 55 publications

(18 citation statements)

References 36 publications

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“…4(b), stratified TiAl phase with inhomogeneous grains distribution is observed perspicuously and some of the matrix grains is even over 40 lm in size. Besides, the Ti 3 Al phase appears 23,24 and is depicted in the top right corner of Fig. 4(b), which is consistent with the XRD analysis result of curve (a) in Fig.…”

Section: Resultssupporting

confidence: 89%

Synthesis, microstructure and mechanical properties of (Ti,Mo)Al/Al₂O₃in situ composites by reactive hot pressing

2017

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composites were successfully synthesized utilizing in situ reactive hot pressing method with Ti, Al, and MoO 3 powders as starting materials. A possible synthesis mechanism was proposed to explain the formation of (Ti,Mo)Al/Al 2 O 3 composites. The investigation results indicate a probable reaction process that molten Al reacted with MoO 3 to form Al 2 O 3 and Mo, and the TiAl matrix grains were refined increasingly by Al 2 O 3 with the addition of MoO 3 increased, accompanying with a small quantity of Mo containing phase AlMoTi 2 formed in the fabricated composites. Meanwhile, the microstructure and mechanical properties of the (Ti,Mo) Al/Al 2 O 3 composites were characterized. The as-synthesized composites exhibited lamellar structure of TiAl intermetallic compound and the in situ formed fine Al 2 O 3 particles dispersed at the stratified TiAl matrix grain boundaries hindering the growth of the grain size of the matrix. And the Rockwell hardness, flexural strength, and fracture toughness of the as-prepared (Ti,Mo) Al/Al 2 O 3 composite were 44.08 HRC, 684 MPa, 7.63 MPaÁm 1/2 , which improved by 57.4%, 107.3%, and 38.7% compared to monolithic TiAl, respectively. The reinforcing mechanism of the material was also discussed.

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Section: Resultssupporting

confidence: 89%

Synthesis, microstructure and mechanical properties of (Ti,Mo)Al/Al₂O₃in situ composites by reactive hot pressing

2017

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“…From the EDS maps of Figure 3D,E, both Si-rich and Snrich layer overlapped Ti-rich reaction layer at the interface. The results demonstrated that Ti-O, 16,18 Ti-Si, 19 Ti-C, 20 or Ti-Si-C 21 and Sn-Ti 16 compounds might be formed at the interface, which were beneficial to improve the wettability of SAC filler on SiC ceramics.…”

Section: Wetting Behavior Of Sic Ceramicsmentioning

confidence: 97%

Wetting behavior and brazing of titanium‐coated SiC ceramics using Sn0.3Ag0.7Cu filler

Song

Chen

et al. 2019

J Am Ceram Soc

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By coating active titanium, Sn0.3Ag0.7Cu (SAC) filler wetted SiC effectively, as the contact angle decreased significantly from ~145° to ~10°. Ti3SiC2 and TiOx (x ≤ 1) reaction layers were formed at the droplet/SiC interface, leading to the reduction of contact angle. Reliable brazing of SiC was achieved using titanium deposition at 900°C for 10 minutes, and the typical interfacial microstructure of Ti‐coated SiC/SAC was SiC/TiOx + Ti3SiC2/Sn(s,s). Comparing to direct brazing, Ti–Sn compounds in the brazing seam were effectively reduced and the mechanical property of joints was dramatically improved by titanium coating. The optimal average shear strength of SiC joints reached 25.3 MPa using titanium coating‐ assisted brazing, which was ∼62% higher than that of SiC brazed joints using SAC‐Ti filler directly.

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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%

“…This means that, for the bonding conditions studied, an amount of 2 wt% of Ti ensures a joining to the two dissimilar base materials, improving the mechanical properties. The reliability and integrity of the joints are In another work of the same authors [24], the effect of the presence of B on two filler metals (commercial Ag-Cu-Ti filler alloy and the Ag-28Cu+TiH 2 ) in the production of a joint of TiAl to Al 2 O 3 was investigated. The assemblies were brazed from 880 to 960 • C for 10 min.…”

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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Microstructure and mechanical properties of Al2O3/TiAl joints brazed with B powders reinforced Ag-Cu-Ti based composite fillers

Cited by 55 publications

References 36 publications

Synthesis, microstructure and mechanical properties of (Ti,Mo)Al/Al₂O₃in situ composites by reactive hot pressing

Synthesis, microstructure and mechanical properties of (Ti,Mo)Al/Al₂O₃in situ composites by reactive hot pressing

Wetting behavior and brazing of titanium‐coated SiC ceramics using Sn0.3Ag0.7Cu filler

Recent Progress in the Joining of Titanium Alloys to Ceramics

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Microstructure and mechanical properties of Al2O3/TiAl joints brazed with B powders reinforced Ag-Cu-Ti based composite fillers

Cited by 55 publications

References 36 publications

Synthesis, microstructure and mechanical properties of (Ti,Mo)Al/Al2O3in situ composites by reactive hot pressing

Synthesis, microstructure and mechanical properties of (Ti,Mo)Al/Al2O3in situ composites by reactive hot pressing

Wetting behavior and brazing of titanium‐coated SiC ceramics using Sn0.3Ag0.7Cu filler

Recent Progress in the Joining of Titanium Alloys to Ceramics

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Product

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Synthesis, microstructure and mechanical properties of (Ti,Mo)Al/Al₂O₃in situ composites by reactive hot pressing

Synthesis, microstructure and mechanical properties of (Ti,Mo)Al/Al₂O₃in situ composites by reactive hot pressing