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- Fu, L. H., et al.
(författare)
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Influence of Cr3C2 content on the wear properties of Cr3C2/Ni3Al composites
- 2016
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Ingår i: Gongcheng Kexue Xuebao/Chinese Journal of Engineering. - 2095-9389. ; 38:8, s. 1145-1152
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Tidskriftsartikel (refereegranskat)abstract
- The Ni3Al-alloy and its composites with different Cr3C2 contents were fabricated by a hot isostatic pressing (HIP) technique. The influences of Cr3C2 content on the microstructure, hardness and wear properties of the Cr3C2/Ni3Al composites were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and wear tribometry. The results show that inter-diffusion occurs between the original Cr3C2 and the Ni3Al particles during the HIP process and the Cr3C2 particles partially transform into M7C3 (M=Cr, Fe, Ni) structures. Under specific friction and wear conditions, the wear resistance of the Cr3C2/Ni3Al composites is significantly improved due to the addition of Cr3C2 particles by about 4-10 times, compared to the Ni3Al alloy. In addition, the cutting and scraping effects of counter-part disks by the Cr3C2/Ni3Al composites decreases with increasing Cr3C2 addition, resulting in a reduction in wear rate of counter-part disks.
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| 2. |
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| 3. |
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| 4. |
- WANG, Hai-feng, et al.
(författare)
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Study on Oasis Distribution Patterns in Dry In-land River Basins
- 2005
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Ingår i: Journal of Hydraulic Engineering. - 1943-7900. ; 36:12, s. 1457-1463
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Tidskriftsartikel (refereegranskat)abstract
- Based on a comparative analysis approach of oasis distributed in arid area of Northwest China, this paper brings up and describes two kinds of oasis distribution pattern: mid-lower reach pattern and middle reach pattern. It is found that the water availability per capita of mid-lower reach pattern is higher than that of middle reach pattern, while the water resources exploitation percentage of mid-lower reach pattern is lower than that of middle reach pattern. The GDP per capita and the urbanization percentage of middle lower reach pattern is lower than those of middle reach pattern in general. The general output per unit water resources of mid-lower reach pattern is lower than that of middle reach pattern as a whole. Through comparing and studying the characteristics of the representative distribution pattern, it is pointed out that the key factor that leads to different oasis pattern is the differences of water resources and social economy development. Under the circumstance of population fast growing, water availability per capita will decrease accordingly. To maintain the oasis stability in line with economic development, improved production efficiency of water resources and balanced social-economic pattern are strongly required.
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