Metal/ceramic interface in an <i>in situ</i>synthesized Ti/TiC<sub>P</sub> composite coating by laser processing

Yu, Ruozhou; Zhang, S.; He, L. L.; Wu, Weiming; Ye, H. Q.

doi:10.1557/jmr.2001.0003

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…As mentioned previously, 18 ␦-TiN is a nonstoichiometric compound, stable in the compositional range from 30 to 55 at.% N, and is usually designated as ␦-TiN 1−x . 12,[27][28][29] According to the Ti-N binary phase diagram, 18 the maximum concentration of solute interstitially dissolved in ␣-Ti is about 23 at.% N, while ␣-Ti(Al,N) solid solution and ␦-TiN 1−x can coexist over the temperature range from 1050 to 2350°C. Fig.…”

Section: Resultsmentioning

confidence: 99%

Formation mechanisms and atomic configurations of nitride phases at the interface of aluminum nitride and titanium

Chiu

Lin

2008

J. Mater. Res.

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were formed during cooling. Further diffusion of N atoms into the reaction zone precipitates a chopped fiber-like ␣ 2 -Ti 2 AlN in the matrix of ␥-TiAl, with [110] ␥−TiAl //[1120] 2 −Ti 2 AlN and (111) ␥−TiAl //(1103) 2 −Ti 2 AlN , by substituting N atoms for one-half Al atoms after annealing at 1400°C for 1 h. The released Al atoms, due to the precipitation of 2 -Ti 2 AlN, resulted in an ordered Al-rich ␥-TiAl or Ti 3 Al 5 . Furthermore, the ␣-Ti (Al, N) was nitridized into a lamellar layer (␦-TiN + ␣-Ti) with [110] ␦−TiN //[1120] ␣−Ti and (111) ␦−TiN //(0001) ␣−Ti .

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Section: Resultsmentioning

confidence: 99%

Formation mechanisms and atomic configurations of nitride phases at the interface of aluminum nitride and titanium

Chiu

Lin

2008

J. Mater. Res.

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“…The morphology and particle size of nanoparticulate catalysts usually affect their catalytic performance. Figure 4 shows the surface morphology of all catalyst samples, and the statistically obtained particle size distribution is given by Figure 5 [28]. The commercial TiO 2 samples had better crystallinity than the other samples, although all samples were composed of sphere-like polygonal nanoparticles with a wide particle size variability.…”

Section: Physical Phase Analysismentioning

confidence: 99%

Facile preparation of ZnO/TiO2 nanocomposite photocatalysts and study of their photocatalytic performance

Lin,

Songyuan,

Yaochong

2023

JOR

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Due to its strong photocatalytic activity, chemical stability, resistance to chemical and optical corrosion, and non-toxic qualities, TiO2 has received a lot of attention as a significant semiconductor material. One of the main areas of research in the field of photocatalysis has always been the system made of ZnO, another significant semiconductor, which has stronger physical and chemical characteristics and photocatalytic activity than TiO2 and ZnO alone.The performance of the photocatalysts can be optimized by adjusting the ratio of the components in the complexes. It was found that the catalytic activity of the particulate ZnO nano photocatalysts could be improved by trace TiO2 addition and high TiO2 concentration in the complex, with higher degradation efficiency for methyl orange under simulated solar illumination. The enhanced performance was attributed to the high photogenerated electron-hole separation rate caused by the increased surface oxygen vacancy defects and the enhanced interfacial charge transfer of the pluralistic heterojunction structure. In addition, there is a certain selectivity of ZnO and TiO2 for the photocatalytic degradation of methylene blue and methyl orange, which is related to the charged nature of the catalyst surface and the ionic nature of the pollutant molecules. The inhibitor studies revealed that the degradation reactions of methylene blue and methyl orange involved the active species hydroxyl radicals, superoxide radicals, and photogenerated holes formed on the catalyst surface, with superoxide radicals dominating the methyl orange reaction. The produced photocatalysts' great stability was validated by cycling experiments. Further research on the impact of catalyst dosage and pH of the contaminant solution on the photocatalytic performance of the catalysts revealed that an increase in catalyst dosage resulted in a greater number of active sites for contaminant molecules and incident light, which increased the efficiency of contaminant degradation. In an alkaline environment, the efficiency of the catalyst for photodegradation of pollutants was significantly increased due to the high concentration of strongly oxidizing hydroxyl radicals contained in the alkaline solution.

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“…As observed in the Ti/TiC composite,ˇ-Ti is stabilized over˛-Ti by the presence of Cr. 5 In this study we usedˇ-Ti, which has a high bulk modulus Meanwhile, we can easily compare aˇ-Ti/nitride interface with our recently studiedˇ-Ti/carbide interface (unpublished results). Forˇ-Ti with a bcc crystal structure, our calculated lattice constant of 3.26Å is in agreement with the experimental value of 3.284Å 32 and the GGA linearaugmented-plane-wave (LAPW) value of 3.24Å.…”

Section: Bulk Propertiesmentioning

confidence: 99%

“…Yu et al 5 have studied the Ti/TiC interface and found (110)ˇ Ti jj 111 TiC and [001]ˇ Ti jj[110] TiC , in which the closepacked planes are matched across the interface. We expect the structure and properties of Ti/TiN and Ti/TiC to be very similar so we take this same model in this study.…”

Section: Interface Geometrymentioning

confidence: 99%

First‐principles study of metal/nitride polar interfaces: Ti/TiN

Liu

Wang

2003

Surface & Interface Analysis

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We have examined the optimal interface structure, ideal work of adhesion and bonding character of polar Ti(110)/TiN(111) interfaces by first-principles density-functional plane-wave pseudopotential calculations. Both Ti-and N-terminated interfaces, including six different interface structures, were calculated. The interface structure for each termination, continuing the TiN crystal structure across the interface, has the largest work of adhesion. Although both terminations yield substantial adhesion energies in the range 3-7 J m −2 , the N-terminated interface is ∼4 J m −2 stronger than the Ti-terminated interface. Analysis of the interfacial electronic structure shows that the Ti-terminated interface is a mixed strong, metallic and weak covalent character, whereas the N-terminated interface is a polar covalent bond similar to the Ti/TiC interface. Further study of the separation of the optimal interface shows that the cleavages will never fracture at the interface due to the strong bonding, which is consistent with the experimental results.

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Metal/ceramic interface in an in situsynthesized Ti/TiC_P composite coating by laser processing

Cited by 6 publications

References 13 publications

Formation mechanisms and atomic configurations of nitride phases at the interface of aluminum nitride and titanium

Formation mechanisms and atomic configurations of nitride phases at the interface of aluminum nitride and titanium

Facile preparation of ZnO/TiO2 nanocomposite photocatalysts and study of their photocatalytic performance

First‐principles study of metal/nitride polar interfaces: Ti/TiN

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Metal/ceramic interface in an in situsynthesized Ti/TiCP composite coating by laser processing

Cited by 6 publications

References 13 publications

Formation mechanisms and atomic configurations of nitride phases at the interface of aluminum nitride and titanium

Formation mechanisms and atomic configurations of nitride phases at the interface of aluminum nitride and titanium

Facile preparation of ZnO/TiO2 nanocomposite photocatalysts and study of their photocatalytic performance

First‐principles study of metal/nitride polar interfaces: Ti/TiN

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Metal/ceramic interface in an in situsynthesized Ti/TiC_P composite coating by laser processing