【摘要】 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。更多还原

【Abstract】 The experiment of diamond segment treatment was achieved by using alternating magnetic fields.Microstructure and fundamental material performance of diamond segment were analyzed after alternating magnetic treatment. The specimens which were heated to 700 ℃ were fixed in the alternating magnetic field,and were treated for 60 min during the experiment.The intensity of alternating magnetic field was 1 T,frequency 50 Hz.The alternating magnetic lines were vertical to diamond segment.Through magnetic shrinking effect deriving from alternating magnetic force,the diamond segment structure was refined.By comparing the hardness and microstructure of diamond segment after magnetic treatment with before,the results indicated that,the surface hardness HRB of specimens were improved by 3.58,the granule figure were clearer,microstructure was more homogeneous and compact.There wasn’t visible clearance between diamond and matrix material,thus reinforcing the holding to diamond.In experiment,the requirement of setting scope adjusting and quick fixing mould were realized by combined clamp designing.The non-conductive and non-magnetic of the direct contact parts between the mould and the magnetic generating equipment were guaranteed by adopting insulating bakelite frame.更多还原