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1Microstructure and formation mechanism of SHS joining between C_f/Al composites and TiAl intermetallic with Al–Ni–CuO interlayer显示文摘In this study, it was reported a novel approach for joining Cf/Al composites and TiAl intermetallic by selfpropagating high-temperature synthesis(SHS). Mixed powders of 14Al–2Ni–3CuO were used as the SHS interlayer, and differential thermal analysis test of Al–Ni–CuO interlayer was conducted to analyze the exothermic characteristic. Sound joint was got by SHS joining under the conditions of 600 °C, 30 min, and 5 MPa. The joint was characterized by scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS), and X-ray diffraction(XRD). TiAl3 and NiAl3 are, respectively, formed in the TiAl/interlayer and Cf/Al/interlayer interfaces. Reaction products of Ni2Al3, NiAl3, Al2O3, and Cu were observed in the interlayer. And the formation mechanism of SHS joining was investigated.Zhuo-Ran Li Guang-Jie Feng Kai Xu Xiang-Long Zhang 2015Rare Metals2015,34,1:4
2High pressure supramolecular chemistry显示文摘High pressure supramolecular chemistry is a developing interdisciplinary field. The use of high pressure for the study and fabrication of supramolecular systems has been explored only in the past few years. Such studies would shed light on the nature of the structures and functions of the complex supramolecular architectures. In this review, systematic progress made in this field is introduced based on the recent achievements. Special attention is paid to pressure-driven novel properties and functions of supramolecular assemblies resulting from the changes of molecular conformations, intermolecular interactions and supramolecular arrangements under high pressure.Kai Wang Shourui Li Xiao Tan Guanjun Xiao Bingbing Liu Bo Zou 2014Chinese Science Bulletin2014,59,36:1
3Preparation and scratch test of AlMgB_(14) modified by TiB_2显示文摘In this paper, the Al Mg B14 and Al Mg B14–Ti B2 composites were synthesized by means of mechanical alloying and the field-activated and pressure-assisted synthesis process. The effect of temperature and pressure on the purity and property of products was discussed. The results show that the process of preparing Al Mg B14 bulk materials is optimized as follows: synthesis temperature1,400–1,500 °C, heating rate 100 °C min-1, axial pressure60 MPa, heat preservation 8–10 min, optimum starting powders' ratio Al: Mg: B = 0.1915:0.1363:0.6722, and adding excessive 3 wt% Al. The abrasion resistance of Al Mg B14 composites with varying amounts of Ti B2 was studied using single-point diamond scratch tests with loads ranging from 10 to 100 N in 10 N increments. The scratch width increases almost linearly with the applied load and decreases with Ti B2 proportion increasing up to 70 wt%.With its advantages of fast heating, short reaction time,energy conservation, and high purity, this method offers a new way to synthesize Al Mg B14 and Al Mg B14–Ti B2 composites.Lei Zhuang Yang Miao Wen Liu Qing-Sen Meng 2015Rare Metals2015,34,2:0
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