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| 1 | 反应热压制备不同SiO_2/C/Al摩尔比原位自生铝基复合材料的耐磨性能(英文)显示文摘反应热压法制备不同SiO_2/C/Al摩尔比的原位自生铝基复合材料。采用销-盘式摩擦试验机对这些复合材料进行干滑动摩擦试验。利用扫描电镜和能谱分析研究复合材料表面成分和形貌。结果表明,当SiO_2/C/Al摩尔比为3:6:9时,原位生成更多Al_2O_3、SiC和Si颗粒,在Al-SiO_2-C体系中Al_4C_3相被彻底抑制,因此复合材料的耐磨性能大幅度提高。当滑动速度从0.4 m/s增加到1.6 m/s时,磨损量逐渐减小。当摩擦载荷增加时,磨损量也增加。观察到的犁沟、磨损坑和细微纹沟说明磨料磨损是主要的磨损机制。然而,当采用更高的滑动速度时,只有氧化磨损机制控制复合材料的磨损行为。 | El Oualid MOKHNACHE 王桂松 耿林 | 2016 | Transactions of Nonferrous Metals Society of China2016，26，4： | 1 |
| 2 | In situ(α-Al_2O_3+ZrB_2)/Al composites with network distribution fabricated by reaction hot pressing显示文摘In situ(α-Al_2O_3+ZrB_2)/Al composites with network distribution were fabricated using low-energy ball milling and reaction hot pressing. Differential thermal analysis(DTA) was used to study the reaction mechanisms in the Al–Zr O2–B system. X-ray diffraction(XRD) and scanning electron microscopy(SEM) in conjunction with energy-dispersive X-ray spectroscopy(EDX) were used to investigate the composite phases, morphology, and microstructure of the composites. The effect of matrix network size on the microstructure and mechanical properties was investigated. The results show that the optimum sintering parameters to complete reactions in the Al–Zr O2–B system are 850°C and 60 min. In situ-synthesized α-Al2O3 and Zr B2 particles are dispersed uniformly around Al particles, forming a network microstructure; the diameters of the α-Al2O3 and Zr B2 particles are approximately 1–3 μm. When the size of Al powder increases from 60–110 μm to 150–300 μm, the overall surface contact between Al powders and reactants decreases, thereby increasing the local volume fraction of reinforcements from 12% to 21%. This increase of the local volume leads to a significant increase in microhardness of the in situ(α-Al2O3–Zr B2)/Al composites from Hv 163 to Hv 251. | El Oualid Mokhnache Gui-song Wang Lin Geng Kaveendran Balasubramaniam Abdelkhalek Henniche Noureddine Ramdani | 2015 | International Journal of Minerals,Metallurgy and Materials2015，22，10： | 0 |
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