CuSn powders and Till2 powders were milled using high energy mechanical milling to prepare Cu-based alloy powders for brazing diamond. And Ce was added to the milled Cu-based alloy powders to improve the wettability. ...CuSn powders and Till2 powders were milled using high energy mechanical milling to prepare Cu-based alloy powders for brazing diamond. And Ce was added to the milled Cu-based alloy powders to improve the wettability. It is found that the wetting angle reaches the minimum value 13.2° and the maximum spreading area 178 mm2 is achieved when the amount of Ce is 0.75 wt%. And Ce remarkably reduces the surface tension of liquid alloy, which improves the climbing height along the diamond and forms a massive support profile. And the results show that Ce can effectively improve the transverse rupture strength （TRS） due to high wettability. The wear characteristics of the diamonds brazed with Cu-based alloy containing 0.75 wt% Ce mainly consist of integrity, micro-fracture, fracture and rubdown, diamonds pull-out can not easily happen.展开更多
刮板输送机是煤矿开采系统的重要设备,承担着煤炭运输的重要任务。在输送过程中,刮板输送机的中部槽工况条件恶劣,磨损严重。通过离散元(Engineering Discrete Element Method,EDEM)软件建立刮板输送机物料输送的动态过程,分析刮板输送...刮板输送机是煤矿开采系统的重要设备,承担着煤炭运输的重要任务。在输送过程中,刮板输送机的中部槽工况条件恶劣,磨损严重。通过离散元(Engineering Discrete Element Method,EDEM)软件建立刮板输送机物料输送的动态过程,分析刮板输送机链轮改进前后中部槽的磨损情况,得出中部槽冲击磨损特性曲线。仿真结果表明,刮板输送机中部槽链条下部区域冲击磨损较大,链轮改进后可有效提高刮板输送机的使用寿命。展开更多
基金Project supported by National Natural Science Foundation of China(51575179,51205126)Natural Science Foundation of Hunan Province(2017JJ3073,12JJB006)
文摘CuSn powders and Till2 powders were milled using high energy mechanical milling to prepare Cu-based alloy powders for brazing diamond. And Ce was added to the milled Cu-based alloy powders to improve the wettability. It is found that the wetting angle reaches the minimum value 13.2° and the maximum spreading area 178 mm2 is achieved when the amount of Ce is 0.75 wt%. And Ce remarkably reduces the surface tension of liquid alloy, which improves the climbing height along the diamond and forms a massive support profile. And the results show that Ce can effectively improve the transverse rupture strength （TRS） due to high wettability. The wear characteristics of the diamonds brazed with Cu-based alloy containing 0.75 wt% Ce mainly consist of integrity, micro-fracture, fracture and rubdown, diamonds pull-out can not easily happen.
文摘刮板输送机是煤矿开采系统的重要设备,承担着煤炭运输的重要任务。在输送过程中,刮板输送机的中部槽工况条件恶劣,磨损严重。通过离散元(Engineering Discrete Element Method,EDEM)软件建立刮板输送机物料输送的动态过程,分析刮板输送机链轮改进前后中部槽的磨损情况,得出中部槽冲击磨损特性曲线。仿真结果表明,刮板输送机中部槽链条下部区域冲击磨损较大,链轮改进后可有效提高刮板输送机的使用寿命。
