Joining of Al2O3p/Al composites by transient liquid phase (TLP) bonding and a novel process of active-transient liquid phase (A-TLP) bonding

Zhang, Guifeng; Zhang, Jianxun; Yi, Peng; Li, Siyu; Chai, D.L.

doi:10.1016/j.msea.2007.11.084

Cited by 41 publications

(25 citation statements)

References 32 publications

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“…However, despite the increases in bond remelting temperature that can be achieved by complete homogenization, an adequate homogenization time is usually determined by a sufficiently high bond strength [2,24,26,42,83,103,122,123,146,150] or economic considerations that limit furnace time [77,125,173]. Nonetheless, the bond's remelting temperature is often hundreds of degrees (°C) above the melting point of the interlayer and can be about 1000°C higher if refractory metals such as Ir, Mo, Nb, Os, Re, Ta, or W are used as the [65,97] substrate or if low melting-point metals such as Al, Ga, In, Mg, Pb, Sb, Sn, or Zn are used as the interlayer.…”

Section: Homogenizationmentioning

confidence: 99%

“…• the process is highly tolerant to the presence of a faying surface oxide layer [ • little melting of the substrate material occurs, as compared to fusion welding processes [42,64] • many joints can be fabricated in one pass [11,147] • the liquid formed during TLP bonding fills voids on uneven mating surfaces, making costly finishing processes unnecessary [2,14,18,19,33,49,161] • overaging of temperature-sensitive materials can be avoided [80,140,186,188].…”

Section: Advantages and Disadvantages Of Tlp Bondingmentioning

confidence: 99%

“…• significant melt-back of a material with a specifically designed microstructure [7,62,141] • the formation of a thick layer of intermetallic compounds in the bond that tend to lower its strength and ductility [9,36,87,110,141,146,157,158,167] • the segregation of particles in metal matrix composites at the joint centerline, leaving a distinct weakened band in the joint microstructure [19,33,39,42,54,105].…”

Section: Advantages and Disadvantages Of Tlp Bondingmentioning

confidence: 99%

“…This technique can also be used in conventional TLP bonding to accelerate isothermal solidification [13,99,140] • Active TLP bonding: a ceramic and metal can be joined by a multi-component interlayer; at least one constituent reacts with the ceramic while another diffuses into the metal to cause isothermal solidification [28,42,52,54,116,132,196] • Partial TLP bonding (see next section).…”

Section: Variants Of Tlp Bondingmentioning

confidence: 99%

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Overview of transient liquid phase and partial transient liquid phase bonding

2011

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Transient liquid phase (TLP) bonding is a relatively new bonding process that joins materials using an interlayer. On heating, the interlayer melts and the interlayer element (or a constituent of an alloy interlayer) diffuses into the substrate materials, causing isothermal solidification. The result of this process is a bond that has a higher melting point than the bonding temperature. This bonding process has found many applications, most notably the joining and repair of Ni-based superalloy components. This article reviews important aspects of TLP bonding, such as kinetics of the process, experimental details (bonding time, interlayer thickness and format, and optimal bonding temperature), and advantages and disadvantages of the process. A wide range of materials that TLP bonding has been applied to is also presented. Partial transient liquid phase (PTLP) bonding is a variant of TLP bonding that is typically used to join ceramics. PTLP bonding requires an interlayer composed of multiple layers; the most common bond setup consists of a thick refractory core sandwiched by thin, lower-melting layers on each side. This article explains how the experimental details and bonding kinetics of PTLP bonding differ from TLP bonding. Also, a range of materials that have been joined by PTLP bonding is presented.

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Section: Homogenizationmentioning

confidence: 99%

Section: Advantages and Disadvantages Of Tlp Bondingmentioning

confidence: 99%

Section: Advantages and Disadvantages Of Tlp Bondingmentioning

confidence: 99%

Section: Variants Of Tlp Bondingmentioning

confidence: 99%

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Overview of transient liquid phase and partial transient liquid phase bonding

2011

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“…Because they have poor machining properties, one focus of research into applications of these composites is on joining them with dissimilar materials. Recently, research into joining of fiber braided composites has focused mainly on brazing [5][6][7][8]. It has been suggested that fiber braided composites have low interlaminar contact strengths because their loose texture results in poor dynamic properties [9,10]; this could make it difficult to form perfect joints at the interfaces.…”

mentioning

confidence: 99%

Brazing of micrograin-filled quartz fiber reinforced silica composites and Invar using Ag-21Cu-4.5Ti alloy

et al. 2011

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Brazing of quartz fiber reinforced silica composites (QFSC) to Invar alloy was carried out in a vacuum at 1173 K for 10 min using Ag-21Cu-4.5Ti metal filler. Experiments indicated that composites prefilled with CaCO 3 micrograins had good wettability. The CaCO 3 decomposed to CaO during brazing. After brazing, a joint of structure QFSC/3CaO·2SiO 2 +Ti 3 O 5 +Fe 2 Ti+NiTi+Ag(s,s)+ Cu(s,s)/Invar was established. The shear strength of the brazed joint reached 11.6 MPa at room temperature, which is about five times the shear strength of that obtained without surface filling. In the field of advanced composites, fiber braided composites are increasingly receiving attention because they are lightweight, and have excellent mechanical strength and high temperature resistance [1][2][3][4]. Quartz fiber reinforced silica composites (QFSCs) also have special electrical properties. Because they have poor machining properties, one focus of research into applications of these composites is on joining them with dissimilar materials. Recently, research into joining of fiber braided composites has focused mainly on brazing [5][6][7][8]. It has been suggested that fiber braided composites have low interlaminar contact strengths because their loose texture results in poor dynamic properties [9,10]; this could make it difficult to form perfect joints at the interfaces. Several techniques have been considered for reinforcement of composites, such as resin transfer molding and vacuum assisted resin transfer molding for different textile performs (2D or 3D textile architectures) [11]. Filler reinforcement using micrograins is an effective modification for reinforcing incompact structures [12,13]. We may infer that good joints could be achieved by reinforcing fiber braided composites with fillers. The aim of our investigation was to study the brazing of Invar alloy to QFSC through experiments examining the effects of micrograin fillers on the composite surface, using Ag-21Cu-4.5Ti as the braze filler metal. The microstructure and joining mechanism were also investigated.

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Adhesion Aspects in Composites

Ferraris

2011

Wiley Encyclopedia of Composites

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Joining of Al2O3p/Al composites by transient liquid phase (TLP) bonding and a novel process of active-transient liquid phase (A-TLP) bonding

Cited by 41 publications

References 32 publications

Overview of transient liquid phase and partial transient liquid phase bonding

Overview of transient liquid phase and partial transient liquid phase bonding

Brazing of micrograin-filled quartz fiber reinforced silica composites and Invar using Ag-21Cu-4.5Ti alloy

Adhesion Aspects in Composites

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