本文进行了对金刚石结块交变磁处理的实验研究,并对交变磁处理后金刚石结块的胎体性能和显微组织进行了分析。将加热到700℃的金刚石结块固定在磁场强度为1 T、频率为50 Hz的交变磁场中处理60 m in,使交变磁力线垂直通过金刚石结块,通...本文进行了对金刚石结块交变磁处理的实验研究,并对交变磁处理后金刚石结块的胎体性能和显微组织进行了分析。将加热到700℃的金刚石结块固定在磁场强度为1 T、频率为50 Hz的交变磁场中处理60 m in,使交变磁力线垂直通过金刚石结块,通过交变磁场力产生的交变磁致收缩效应,使金刚石结块组织实现致密和均匀化。磁处理前后对比分析发现:试件表面的HRB硬度值平均提高3.58个硬度值;磁处理后试件的颗粒轮廓清晰,微观组织均匀、致密;磁处理后金刚石与胎体间的连接没有明显间隙,加强了对金刚石的把持能力。实验中,组合式的夹具设计实现了装卡范围的调节和快速固定模具的要求,同时绝缘电木外框保证了模具与磁场发生器直接接触部分不导电、不导磁。展开更多
Copper, iron and cobalt based pre-alloyed powders for diamond tools were prepared by ultrahigh pressure water atomization（UPWA） process. Pre-alloyed powders prepared by different processes including UPWA, convention...Copper, iron and cobalt based pre-alloyed powders for diamond tools were prepared by ultrahigh pressure water atomization（UPWA） process. Pre-alloyed powders prepared by different processes including UPWA, conventional water atomization （CWA） and elemental metal mechanical mixing （EMMM） were sintered to segments and then compared in mechanical properties, holding force between matrix and diamond, fracture morphology of blank and sintering diamond section containing matrix. The results showed that the pre-alloyed powder prepared by UPWA exhibits the best mechanical properties including the relative density, the hardness and the bending strength of matrix sinteredsegment. Sintered segments fractography of UPWA pre-alloyed powder indicatesmechanical mosaic strength and chemical bonding force between the pre-alloyed powder and the diamond, leading to the great increase in the holding force between matrix and diamond. The mechanical performance andthe service life of diamond tools were greatly improved by UPWA pre-alloyed powders.展开更多
文摘本文进行了对金刚石结块交变磁处理的实验研究,并对交变磁处理后金刚石结块的胎体性能和显微组织进行了分析。将加热到700℃的金刚石结块固定在磁场强度为1 T、频率为50 Hz的交变磁场中处理60 m in,使交变磁力线垂直通过金刚石结块,通过交变磁场力产生的交变磁致收缩效应,使金刚石结块组织实现致密和均匀化。磁处理前后对比分析发现:试件表面的HRB硬度值平均提高3.58个硬度值;磁处理后试件的颗粒轮廓清晰,微观组织均匀、致密;磁处理后金刚石与胎体间的连接没有明显间隙,加强了对金刚石的把持能力。实验中,组合式的夹具设计实现了装卡范围的调节和快速固定模具的要求,同时绝缘电木外框保证了模具与磁场发生器直接接触部分不导电、不导磁。
基金Projects(2010SK3172,2015JC3005)supported by the Key Program of Science and Technology Project of Hunan Province,China
文摘Copper, iron and cobalt based pre-alloyed powders for diamond tools were prepared by ultrahigh pressure water atomization（UPWA） process. Pre-alloyed powders prepared by different processes including UPWA, conventional water atomization （CWA） and elemental metal mechanical mixing （EMMM） were sintered to segments and then compared in mechanical properties, holding force between matrix and diamond, fracture morphology of blank and sintering diamond section containing matrix. The results showed that the pre-alloyed powder prepared by UPWA exhibits the best mechanical properties including the relative density, the hardness and the bending strength of matrix sinteredsegment. Sintered segments fractography of UPWA pre-alloyed powder indicatesmechanical mosaic strength and chemical bonding force between the pre-alloyed powder and the diamond, leading to the great increase in the holding force between matrix and diamond. The mechanical performance andthe service life of diamond tools were greatly improved by UPWA pre-alloyed powders.
