Study of the Ti/Al2O3 interface

Lu, Haifei; Bao, C. L.; Shen, Dian Hong; Zhang, X. J.; Cui, Yongde; Lin, Zhien

doi:10.1007/bf00354393

Cited by 37 publications

(14 citation statements)

References 17 publications

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“…In this study, the main diffusing element was first oxygen followed by aluminum, and the diffusion of Ti into Al 2 O 3 was negligible. The interfacial reactions between Al 2 O 3 and Ti can be described by the following 3 equations:

{Al}_{2} {normalO}_{3} \to 2 Al + 3 false/ 2 {normalO}_{2}

Ti + 3 false/ 2 {normalO}_{2} \to 3 {[O]}_{Ti}

Ti + 2 Al + 5 false/ 2 {normalO}_{2} \to {TiAl}_{2} {normalO}_{5}

where [O] Ti represents active oxygen dissolved in titanium. The values of Δ G for Equations and are −1279.2 and −1753.6 kJ/mol, respectively, at 1500°C.…”

Section: Resultsmentioning

confidence: 99%

Fine Ti‐dispersed Al₂O₃ composites and their mechanical and electrical properties

et al. 2018

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Al2O3/Ti composites containing 0‐30 vol% dispersed fine Ti particles were fabricated using a hot‐press sintering method at 1500°C from mixtures of Al2O3 and TiH2 powders. During sintering, TiH2 decomposed to form metallic Ti. The effects of the Ti content on the mechanical and electrical properties of the composites were then investigated. No Ti‐Al intermetallic compounds were detected by X‐ray diffraction, and energy‐dispersive X‐ray spectroscopy indicated the presence of Al‐Ti‐O solid solution and Ti‐O phases. The composites showed enhanced densification; the measured densities were higher than the calculated theoretical values. Microstructural observation revealed homogeneously distributed fine Ti particles dispersed in the Al2O3 matrix. The Ti particle size ranged from submicrometer to a few micrometers depending on the Ti content. The fracture mode of the composites was primarily transgranular, in contrast to the intergranular fracture mode of monolithic Al2O3. Although the flexural strength was decreased with increase in Ti content, the composite containing 20 vol% Ti displayed the maximum fracture toughness of 4.3 MPa·cm1/2, which was 37% greater than that of monolithic Al2O3. The composites containing more than 15 vol% Ti exhibited drastic decreases in resistivity (~10−1 Ωcm), which were attributed to the formation of interconnected Ti networks at these Ti contents. The percolation threshold volume for electrical conduction in the present system was calculated to be 13.8 vol%. The results indicate that dispersing fine Ti particles into Al2O3 increased the fracture toughness and improved the conductivity of Al2O3.

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{Al}_{2} {normalO}_{3} \to 2 Al + 3 false/ 2 {normalO}_{2}

Ti + 3 false/ 2 {normalO}_{2} \to 3 {[O]}_{Ti}

Ti + 2 Al + 5 false/ 2 {normalO}_{2} \to {TiAl}_{2} {normalO}_{5}

where [O] Ti represents active oxygen dissolved in titanium. The values of Δ G for Equations and are −1279.2 and −1753.6 kJ/mol, respectively, at 1500°C.…”

Section: Resultsmentioning

confidence: 99%

Fine Ti‐dispersed Al₂O₃ composites and their mechanical and electrical properties

et al. 2018

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“…[ 166 ] Figure 12c shows a flexible thermoelectric device composed of PANI/SWCNT films. [ 76b ] This type of planar structure is the most common structural design in FTEG and applies to polymer/carbon hybrid fibers, such as PEDOT:PSS/graphene fibers [ 34c ] and PVA/waterborne polyurethane/SWCNTs fibers [ 56 ] (Figure 12d,e). These hybrid fibers are not only bendable but also stretchable, generating stable thermoelectric power even in various shapes and providing an opportunity to fabricate practical wearable FTEGs.…”

Section: Applications Based On Polymer/carbon Te Nanocompositesmentioning

confidence: 99%

Polymer/Carbon Composites with Versatile Interfacial Interactions for High Performance Carbon‐Based Thermoelectrics: Principles and Applications

Liang

Cui

Zhang

et al. 2022

Adv Funct Materials

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The urgent demand for renewable energy has attracted widespread interest in polymer‐based thermoelectric materials due to easy fabrication, high flexibility, low toxicity, low thermal conductivity, and great potential in industrial applications. However, the power factors of the polymers are still quite low compared with those of their inorganic counterparts, resulting in a low energy conversion efficiency. Highly conductive carbon materials, including graphene and carbon nanotubes, have recently been incorporated into the polymer matrix through intrinsic chemical intimacy, providing new opportunities to tune the thermoelectric properties. In particular, the characteristic π‐π coupling and other interactions between the two components have contributed to unique mechanisms for better thermoelectric performance beyond the simple rule of mixtures. This paper aims to review the up‐to‐date progress in polymer/carbon nanocomposites along with various compositions and novel synthetic strategies. The salient aspects of this review are characteristic interactions and various mechanisms, which might result in enhanced thermoelectric properties and subsequent potential applications in energy harvesting, wearable electronics, photo‐thermoelectrics, and other devices.

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“…In order to study the Ti and Al 2 O 3 under the condition of a high-temperature interface reaction mechanism, the scientific researchers have done a lot of research, mainly concentrated in Ti and Al 2 O 3 interface reaction characteristics, composition and generate order, element diffusion distance, etc. Lu [11] had analyzed the forming process and composition of Ti/Al 2 O 3 composite interface under different conditions. The results showed that Ti reacted with Al 2 O 3 to form an interface layer of about 200 nm in thickness.…”

Section: Introductionmentioning

confidence: 99%

Modelling the Elements Reaction–Diffusion Behavior on Interface of Ti/Al2O3 Composite Prepared by Hot Pressing Sintering

Shi

Zhang

Wang

2020

Metals

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Element reaction-diffusion of Ti/Al 2 O 3 composite which was fabricated at various sintering temperatures, holding times, and a sintering pressure of 30 MPa has been discussed in the present research. Results show that the thickness of the reaction layer of the Ti-Al 2 O 3 interface was increased in exponential form in correspondence with the increase of the sintering temperature. Furthermore, according to analysis, the relationship between the thickness of the interface reaction layer, sintering temperature, and heat preservation time acquiring the kinetic equation of interfacial reaction of Ti/Al 2 O 3 composite was d = 182.5exp(−6.6 × 10 4 /RT)t 0.48 by linear fitting.

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Study of the Ti/Al2O3 interface

Cited by 37 publications

References 17 publications

Fine Ti‐dispersed Al₂O₃ composites and their mechanical and electrical properties

Fine Ti‐dispersed Al₂O₃ composites and their mechanical and electrical properties

Polymer/Carbon Composites with Versatile Interfacial Interactions for High Performance Carbon‐Based Thermoelectrics: Principles and Applications

Modelling the Elements Reaction–Diffusion Behavior on Interface of Ti/Al2O3 Composite Prepared by Hot Pressing Sintering

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Study of the Ti/Al2O3 interface

Cited by 37 publications

References 17 publications

Fine Ti‐dispersed Al2O3 composites and their mechanical and electrical properties

Fine Ti‐dispersed Al2O3 composites and their mechanical and electrical properties

Polymer/Carbon Composites with Versatile Interfacial Interactions for High Performance Carbon‐Based Thermoelectrics: Principles and Applications

Modelling the Elements Reaction–Diffusion Behavior on Interface of Ti/Al2O3 Composite Prepared by Hot Pressing Sintering

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Fine Ti‐dispersed Al₂O₃ composites and their mechanical and electrical properties

Fine Ti‐dispersed Al₂O₃ composites and their mechanical and electrical properties