Al-5%Si-AI2O3 composites were prepared by powder metallurgy and in-situ reactive synthesis technology. Friction and wear properties of Al-5%Si-Al2O3 composites were studied using an M-2000 wear tester. The effects of ...Al-5%Si-AI2O3 composites were prepared by powder metallurgy and in-situ reactive synthesis technology. Friction and wear properties of Al-5%Si-Al2O3 composites were studied using an M-2000 wear tester. The effects of load, sliding speed and long time continuous friction on friction and wear properties of Al-5%Si-Al2O3 composites were investigated, respectively. Wear surface and wear mechanism of Al-5%Si-Al2O3 composites were studied by Quanta 200 FE-SEM. Results showed that with load increasing, wear loss and coefficient of friction increased. With sliding speed going up, the surface temperature of sample made the rate of the producing of oxidation layer increase, while wear loss and coefficient of friction decreased. With the sliding distance increasing, coefficient of friction increased because the adhesive wear mechanism occurred in the initial stage, then formation and destruction of the oxide layer on the surface of the sample tended to a dynamic equilibrium, the surface state of the sample was relatively stable and so did the coefficient of friction. The experiment shows that the main wear mechanism of Al-5%Si-Al2O3 composites includes abrasive wear, adhesive wear and oxidation wear.展开更多
为了提高高速钢微细钻头的钻削质量,研究了物理气相沉积(PVD)涂层高速钢微细钻头在高速干式环境下钻削铝合金时的钻削性能。应用PVD离子镀技术在直径0.2 mm的高速钢微细钻头上制备Ti Al Si N、DLC、Ti N和Al Ti N 4种涂层,并通过同时沉...为了提高高速钢微细钻头的钻削质量,研究了物理气相沉积(PVD)涂层高速钢微细钻头在高速干式环境下钻削铝合金时的钻削性能。应用PVD离子镀技术在直径0.2 mm的高速钢微细钻头上制备Ti Al Si N、DLC、Ti N和Al Ti N 4种涂层,并通过同时沉积涂层的高速钢圆盘间接测量得到涂层的显微硬度、厚度和平均摩擦系数。以6061铝合金为被加工零件对涂层的实际加工性能进行了试验测试,得到了已钻取孔的表面形貌、直径和角磨损量。通过VHM-I04显微硬度计在0.49 N下测定,DLC涂层微钻的显微硬度为2 800,摩擦系数为0.05,钻削效果在所有涂层微钻和未涂层微钻中最好。因与高速钢基体结合差,导致Ti Al Si N涂层容易脱落、微钻磨损快,故Ti Al Si N涂层不适合沉积在微钻表面。展开更多
基金Project(51201143)supported by the National Natural Science Foundation of ChinaProject(SWJTU12BR004)supported by the Fundamental Research Funds for the Central Universities,China
文摘Al-5%Si-AI2O3 composites were prepared by powder metallurgy and in-situ reactive synthesis technology. Friction and wear properties of Al-5%Si-Al2O3 composites were studied using an M-2000 wear tester. The effects of load, sliding speed and long time continuous friction on friction and wear properties of Al-5%Si-Al2O3 composites were investigated, respectively. Wear surface and wear mechanism of Al-5%Si-Al2O3 composites were studied by Quanta 200 FE-SEM. Results showed that with load increasing, wear loss and coefficient of friction increased. With sliding speed going up, the surface temperature of sample made the rate of the producing of oxidation layer increase, while wear loss and coefficient of friction decreased. With the sliding distance increasing, coefficient of friction increased because the adhesive wear mechanism occurred in the initial stage, then formation and destruction of the oxide layer on the surface of the sample tended to a dynamic equilibrium, the surface state of the sample was relatively stable and so did the coefficient of friction. The experiment shows that the main wear mechanism of Al-5%Si-Al2O3 composites includes abrasive wear, adhesive wear and oxidation wear.
文摘为了提高高速钢微细钻头的钻削质量,研究了物理气相沉积(PVD)涂层高速钢微细钻头在高速干式环境下钻削铝合金时的钻削性能。应用PVD离子镀技术在直径0.2 mm的高速钢微细钻头上制备Ti Al Si N、DLC、Ti N和Al Ti N 4种涂层,并通过同时沉积涂层的高速钢圆盘间接测量得到涂层的显微硬度、厚度和平均摩擦系数。以6061铝合金为被加工零件对涂层的实际加工性能进行了试验测试,得到了已钻取孔的表面形貌、直径和角磨损量。通过VHM-I04显微硬度计在0.49 N下测定,DLC涂层微钻的显微硬度为2 800,摩擦系数为0.05,钻削效果在所有涂层微钻和未涂层微钻中最好。因与高速钢基体结合差,导致Ti Al Si N涂层容易脱落、微钻磨损快,故Ti Al Si N涂层不适合沉积在微钻表面。
