Facile synthesis of high‐melting point spherical TiC and TiN powders at low temperature

Xiang, Maoqiao; Song, Miao; Zhu, Qingshan; Hu, Chaoquan; Yang, Yafeng; Lv, Pengpeng; Zhao, Hongdan; Yun, Fen

doi:10.1111/jace.16810

Cited by 20 publications

(5 citation statements)

References 40 publications

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“…51−56 Notably, when TiB 2 and TiN were employed as catalyst precursors, their high melting points (TiB 2 : 3225 °C; TiN: 2950 °C) posed a challenge for direct utilization as active catalysts in BNNT growth via CVD. 57,58 As a result, we speculate that the two catalyst precursors formed low-meltingpoint oxygen-containing intermediate phases during the reaction, such as titanium borate.…”

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confidence: 93%

“…Additionally, the XPS spectra predominantly exhibited characteristic peaks corresponding to Ti–B, Ti–N, Ti–O, and B–O bonds in the powder samples, indicating the formation of oxygen-containing Ti-based compounds during the reaction (Figure S9b). − Notably, when TiB 2 and TiN were employed as catalyst precursors, their high melting points (TiB 2 : 3225 °C; TiN: 2950 °C) posed a challenge for direct utilization as active catalysts in BNNT growth via CVD. , As a result, we speculate that the two catalyst precursors formed low-melting-point oxygen-containing intermediate phases during the reaction, such as titanium borate.…”

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confidence: 99%

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Ti–B–O System for Catalyzing Boron Nitride Nanotube Growth

He,

Ding,

et al. 2024

J. Phys. Chem. Lett.

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Chemical vapor deposition (CVD) stands out as the most promising method for cost-effective production of high-quality boron nitride nanotubes (BNNTs). Catalysts play a crucial role in BNNT synthesis. This work delves into the impact of oxygen (O) on Ti-based catalysts during the CVD growth of BNNTs. In contrast to the B/TiB 2 nanoparticles (NPs) and B/TiN NPs systems, the oxygen-containing precursor B/TiO 2 NPs remarkably catalyzes the growth of high-quality and high-purity BNNTs across a wider range of synthesis parameters. Subsequent analyses reveal that TiBO 3 acts as an active catalyst, facilitating BNNT growth in Tibased catalyst systems. Moreover, the nanocomposite film synthesized from BNNTs and PVDF-HFP exhibits excellent mechanical properties and heat dissipation capabilities. Utilizing the nanocomposite film as a thermal interface material effectively enhances the heat dissipation for a 5 W light-emitting diode (LED) chip. Consequently, our research confirms the effectiveness of the Ti−B−O system in catalyzing BNNT growth.

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confidence: 93%

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confidence: 99%

Ti–B–O System for Catalyzing Boron Nitride Nanotube Growth

He,

Ding,

et al. 2024

J. Phys. Chem. Lett.

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“…It costs a lot to use titanium metal as a raw material. Titanium tetrachloride can react with calcium carbide or methane to produce TiC [13][14][15][16]. Titanium tetrachloride is highly corrosive, so the corrosion resistance of the reaction vessel is crucial.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Titanium Carbide by Carburisation of Titanium Dioxide

Lv,

Tian,

2024

Processes

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Titanium carbide has attracted widespread attention due to its excellent properties. This study investigates the process of carbon thermally reducing TiO2 to prepare TiC through a combination of thermodynamic analysis and experiments. The effects of temperature, TiO2/C molar ratio, and time on the phase transformation and morphology evolution of the products are investigated. The synthesis of titanium carbide involves the main reduction path of TiO2–Magnéli–Ti3O5–Ti2O3–TiCxO1−x. With the increase in reaction temperature and TiC content, the microstructure transitions from a smooth disc-like structure to a loose and porous layered structure, while the particle size decreases significantly. The carburisation rate of the reduced product is more affected by temperature, according to chemical analysis. The carburisation rate increased from 18.37% to 36.09% for 2 h–10 h of holding time at 1400 °C, and from 51.43% to 77.57% for 2 h–10 h of holding time at 1500 °C. The quantification of the carburisation rate provides a valuable reference for the preparation of titanium carbide by TiO2.

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“…Grain refinement with an average grain size of 1.94 µm in AA7075 and samples without cracks after PBF-LB/M were achieved with the addition of 4 ma% titanium nitride (TiN) nanoparticles [ 22 ]. Transferred from casting with Al-Ti-C refiners [ 23 , 24 ], titanium carbide (TiC) particles are also used as a direct nucleant since they have a high melting point (3140 °C [ 25 ]) and a low lattice mismatch to the aluminum matrix, making them a suitable grain refiner [ 23 , 26 ]. For successful crack-free arc welding of the aluminum alloy 7075, Sokoluk et al, applied filler containing 1.7 vol% TiC nanoparticles [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Requirements for Processing High-Strength AlZnMgCu Alloys with PBF-LB/M to Achieve Crack-Free and Dense Parts

et al. 2021

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Processing aluminum alloys employing powder bed fusion of metals (PBF-LB/M) is becoming more attractive for the industry, especially if lightweight applications are needed. Unfortunately, high-strength aluminum alloys such as AA7075 are prone to hot cracking during PBF-LB/M, as well as welding. Both a large solidification range promoted by the alloying elements zinc and copper and a high thermal gradient accompanied with the manufacturing process conditions lead to or favor hot cracking. In the present study, a simple method for modifying the powder surface with titanium carbide nanoparticles (NPs) as a nucleating agent is aimed. The effect on the microstructure with different amounts of the nucleating agent is shown. For the aluminum alloy 7075 with 2.5 ma% titanium carbide nanoparticles, manufactured via PBF-LB/M, crack-free samples with a refined microstructure having no discernible melt pool boundaries and columnar grains are observed. After using a two-step ageing heat treatment, ultimate tensile strengths up to 465 MPa and an 8.9% elongation at break are achieved. Furthermore, it is demonstrated that not all nanoparticles used remain in the melt pool during PBF-LB/M.

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Facile synthesis of high‐melting point spherical TiC and TiN powders at low temperature

Cited by 20 publications

References 40 publications

Ti–B–O System for Catalyzing Boron Nitride Nanotube Growth

Ti–B–O System for Catalyzing Boron Nitride Nanotube Growth

Preparation of Titanium Carbide by Carburisation of Titanium Dioxide

Requirements for Processing High-Strength AlZnMgCu Alloys with PBF-LB/M to Achieve Crack-Free and Dense Parts

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