Synthesis of Layered Ti2Al(N0.5C0.5) by a Combination of High Energy Milling and Hot Press Sintering

Zhu, Jian Feng; Han, Na; Wang, Kun; Wang, Fen

doi:10.4028/www.scientific.net/AMM.52-54.846

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HomeApplied Mechanics and MaterialsAdvances in Mechanical EngineeringSynthesis of Layered Ti2Al(N0.5C0.5) by a...

Synthesis of Layered Ti₂Al(N_0.5C_0.5) by a Combination of High Energy Milling and Hot Press Sintering

Abstract:

Elemental mixture of Ti, Al and C was high energy milled in a planetary ball mill under high-purity nitrogen gas protection and then hot pressed. The fully dense bulk layered ternary Ti2AlN0.5C0.5 with sub-micron grain size was successfully obtained. The phase formation and transformation in high energy milling and subsequently hot press sintering were studied in detail by using X-ray diffraction (XRD). Scanning electron microscopy (SEM) linked with energy dispersive spectroscopy (EDS) was used for the structural and compositional analysis. The formation mechanism was also discussed.

Info:

Periodical:

Applied Mechanics and Materials (Volumes 52-54)

Main Theme:

Advances in Mechanical Engineering

Edited by:

Zhou Mark

Pages:

846-849

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.52-54.846

Citation:

J. F. Zhu et al., "Synthesis of Layered Ti₂Al(N_0.5C_0.5) by a Combination of High Energy Milling and Hot Press Sintering", Applied Mechanics and Materials, Vols. 52-54, pp. 846-849, 2011

Online since:

March 2011

Authors:

Jian Feng Zhu, Na Han, Kun Wang, Fen Wang

Keywords:

High-Energy-Milling, Hot Press, Microstructure, Ti₂AlN_0.5C_0.5

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References

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Paper TitlePages

Microstructure and Morphology of Alumina-Iron Nanocomposite Powders Produced by High Energy Mechanical Milling

Authors: M. Yusop, De Liang Zhang, M. Wilson

Abstract: Alumina-iron nanocomposite powders containing 5vol.% of iron were fabricated by high-energy ball milling with different ball-to-powder weight ratios (BPRs) as part of the study of ceramic-metal nanocomposite magnetic materials. The microstructure and morphology of the composite powders were characterized using the X-ray diffraction, optical microscopy and scanning electron microscopy. XRD analysis and SEM examination in combination with energy dispersive X-ray spectrometry confirmed that the nanocomposite structure of the powder particles formed only after 8 hours milling for both BPRs used. With a higher BPR of 16:1, Fe-Cr alloy material was broken from the stainless steel balls and incorporated into the nanocomposite powder. However, such a problem did not occur with a lower BPR of 5:1. The mechanism for formation of the alumina matrix nanocomposite powder is found to be dependent on BPR and milling time.

131

High Purity Ti₂AlC Powder Prepared by a Novel Method

Authors: Jian Feng Zhu, Guo Quan Qi, Fen Wang, Hai Bo Yang

Abstract: Ti2AlC powders with high purity were successfully synthesized via high energy milling and heat treatment of Ti, C and Al powders. The effects of composition and thermal treatment on the formation and purity of Ti2AlC were examined in detail. The results shown a mechanically induced self-propagating reaction (MSR) was triggered to form Ti3AlC2, TiC and TiAlx during the high energy milling. When the as-milled powders were heat treated, Ti2AlC was initially formed by the reaction between TiAl and TiC. With continuously increasing temperature, Ti2AlC was also produced by the reaction between TiAl and Ti3AlC2.

340

Effect of Starting Powders on Microstructure and Properties of Silicon Nitride Nanoceramics

Authors: Hai Jiang, Chun Yan Tian

Abstract: Silicon nitride nanoceramics were fabricated by hot press sintering two kinds of Si₃N₄ nano-sized powders. The effect of starting powders on microstructure, mechanical properties and thermal shock resistance were investigated. The microstructure of sintered materials consists of spherical grains and the addition of α–Si₃N₄ to starting powders does not affect the grain morphology. The flexural strength, fracture toughness and thermal shock resistance increase with the increase in amount of α–Si₃N₄ starting powders, and the maximum mechanical properties are obtained when the amount of α–Si3N4 powders is 40wt.%. The hardness values decrease with the increase of α–Si₃N₄ amount.

239

The Synthesis of TiC Powders by Carbothermal Reduction Method in Vacuum

Authors: Xue Tan Ren, Yan Chun Liu, Shui Hui Chen, Lai Guang Hou, Guo Long Wang, Yuan Cheng Teng

Abstract: The TiC powders were synthesized by carbothermal reduction of TiO₂ in vacuum using the titania and carbon black as raw materials. The molar ratio of C to TiO₂ was 3:1. The crystalline phase, microstructure and morphology of the obtained samples were investigated by XRD and SEM. The results show that single-phase and well-crystallized TiC powders were obtained at 1300^°C for 1h when the system pressure was 20 Pa. The particle morphologies are composed of fine grains about 200 nm.

Preparation of (K,Na)NbO₃ Powders with Wide Grain Size Distribution

Authors: Yu Hua Zhen, Kai Li Jia, Lin Ling Li, Yu Xi Qiao, Fu Hua Sun, Min Zhang

Abstract: This study is aimed at obtaining (K,Na)NbO₃ powders with wide grain size distribution methods. (K,Na)NbO₃ powders were successfully synthesized by different ways, including hydrothermal method, sol-gel method, and molten-salt method. The experiment results showed that the hydrothermal and sol-gel methods could not control the grain size of the (K,Na)NbO₃ powders effectively . The grain size of (K,Na)NbO₃ powders can be only tailored by the molten-salt method through controlling the starting oxide powder morphology, as well as crystallization temperature. The grain size was not affected by the experimental parameters whether or not the initial powders were milled. Furthermore, it has been found that the crystallization temperature could change the grain size of the powders monotonously. The (K,Na)NbO₃ powders synthesized by molten salt method distributed from nanoscale to micron level, which can lay the foundation for further research on the grain size effect of (K,Na)NbO₃ lead free piezoelectric ceramics.

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