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In order to get rid of the disadvantages that are tabooed by carbon sealing materials for mechanical applications, carbon graphite needs to be improved through impregnation [1].
Above-mentioned two reasons may also exist but not very obviously in the first two categories because materials of this category have very low porosity (9.241%).
Materials for Mechanical Engineering, 2006,30(6): 56-57 (In Chinese)
Journal of China University of Petroleum(Natural Science Edition ) ，2010,3:80-84 (In Chinese)
Journal of China University of Petroleum (Natural Science Edition), 2007, 31(5): 60-63 (In Chinese)

Experimental Procedure Starting Materials.
Bull: Materials Science Forum.
Phule: The science and engineering of materials, 4th ed., Brooks/Cole- Thomson Learning, USA (2003)
Gadow: Journal of Surface & Coatings Technology.
Yang: Journal of Surface & Coatings Technology.

Materials and methods Materials and reagents.
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Kapoor: Journal of Manufacturing Science and Engineering, Vol. 126 (2004) No. 3, p.666-678 [4] M.
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Here, the specially adapted joining elements limit the convertibility of the process to different materials, including thin sheet materials [11] [12].
In: Journal of Materials Processing Technology 214 (2), S. 151-164, 2014, https://doi.org/10.1016/j.jmatprotec.2013.08.015 [6] Martinsen, K., Hu, S.
Joining of dissimilar materials.
Journal of Manufacturing Science and Engineering, https://doi.org/10.1115/1.4025421 [9] Yunwu Ma, Sizhe Niu, Huihong Liu, Yongbing Li, Ninshu Ma, Microstructural evolution in friction self-piercing riveted aluminum alloy AA7075 T6 joints, Journal of Materials Science & Technology, Volume 82, 2021, Pages 80-95, https://doi.org/10.1016/j.jmst.2020.12.023
Experimental tests and mesoscale numerical simulations, Journal of Materials Processing Technology, Volume 294, 2021, 117133, https://doi.org/10.1016/j.jmatprotec.2021.117133 [13] Johan Kolstø Sønstabø, David Morin, Magnus Langseth, Testing and modelling of flow-drill screw connections under quasi-static loadings, Journal of Materials Processing Technology, Volume 255, 2018, Pages 724-738, https://doi.org/10.1016/j.jmatprotec. 2018.01.007

Experimental Materials.
Generally, blending starch with PVA improves the mechanical properties of the starch based materials.
Figure. 2 showed the tensile strength of the blend materials.
Journal of Cleaner Production, 11, 27 – 40,(2003)
Unmar, Determining biodegradability of plastic materials under controlledand natural composting environments.

It is able to cut a hundred of plates at the same time. (2) Low percentage of the waste materials.
Liao: Journal of stone material, Vol. 9 (2011)
[3] X.G Liu: Journal of stone material, Vol. 9 (2004)
Jungsun: Chinese Journal of Aeronautics, Vol. 26 (2013) NO.1, p. 112-121
Peng: Journal of Mechanical Engineering, Vol. 49 NO.3, p. 153-162.

Secondary processing of technogenic materials is facilitated by the fact that they are preprocessed – ground and compactly deposited on the surface, but complicated by the low (compared to ores) grade, uneven distribution of the valuable minerals, altered and unstable material composition of the mineral feed.
Materials and Methods The object of this study are the MFT of Uchaly Concentrator in the Republic of Bashkortostan, Russia, which processes copper-pyrite and copper-zinc ores.
Medyanik, Study of the component composition of solid technogenic raw materials of JSC “Uchaly Mining and Metallurgical Combine”, Actual problems of modern science, technology and education. 1 (2014) 239-243
Rylnikova, Comprehensive development of deposits and deep processing of mineral raw materials, Nauka, Moscow, 2010
Leont'eva, Study of the possibility of gold recovery from sulfide raw materials using nitrate-chloride digestion, in: Modern processes of comprehensive and deep conversion of refractory mineral raw materials (Plaksinsky readings-2015): the proceedings of the International conference, RIEL, Irkutsk, (2015) 401-404

Effects of Superposed Field on Solidification Microstructure of Al-7wt%Si Alloy Zhihua Wang1, a, Ming Zhu1 and Guangji Xu2 1College of Material Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China 2State key laboratory of advanced nonferrous metal materials, Lanzhou University of Technology, Lanzhou 730050, Gansu, China awangzhihua_wx@163.com Keywords: Superposed Field; Solidification Microstructure; Grain Refinement Abstract.
Introduction The application of an electric or magnetic field during the solidification of materials, so called electromagnetic processing of materials (EPM), has been found to have an influence on the microstructure of the resulting solid especially on the grain refinement, since magnetic field was applied to the solidification process of metal by Johnson et al. in 1965[1-4].
Zhu: Acta Metallurgical Sinica (English Letters) Vol. 10(6) (1997), p.461 [5] Wenqun Ma, Feng Chen and Guangji Shu: Journal of Southeast University(Natural Science Edition) Vol. 29(12) (1989), p. 981 (in Chinese) [6] Xiaoliang Liao, Qijie Zhai, Jun Luo et al.: Acta materialia.
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Ohring, material Science of thin film, 2nd ed.
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Sanchez, Journal Of Electronic Materials, Vol. 49, No. 6, 2020. ].
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