针对当前细粒度钎焊金刚石工具因无法满足“把持持久、分散有效、轮廓正确”要求而难以胜任精加工的瓶颈，在准确把握“磨粒焊中跑位与容屑空间缺失”和“化学侵蚀引发磨粒热损伤”是其根源的基础上，提出了占位原理与武火温控策略协同解决瓶颈的新构想，并提出采用多级机械分散与静电场辅助相结合解决焊前磨粒分散与钎料涂覆问题，进而形成制备形、性兼具的细粒度金刚石钎焊工具整套解决方案。重点揭示微波加热下占位颗粒吸波换热温度场时变规律与武火温升曲线调控机制；颗粒间粒径匹配与磨粒出刃形态、容屑空间几何包络分析；占位颗粒阻挡下钎焊熔化、微隙空间铺展与磨粒出刃形态、容屑空间形成；金刚石/钎料界面反应层形成、厚度及对磨粒性能的影响；结合工程应用通过典型铣磨头及砂轮的钎焊制备、轮廓地貌检测及其加工性能评价进行综合验证。

Currently, the brazed fine-grit diamond tools are not qualified for fine grinding because of their bottleneck of being unable to meet the requirements of long-retention, effective grit dispersing and correct contours. The grit movement and excessive chemical erosion during brazing are found to be the reason for the bottleneck. Based on this, a new solution is proposed, which is the combination of the space occupancy and the short-term high-heat temperature control strategy. The occupancy particles are used to fill the space around the diamond grits to block and prevent them from moving in brazing. With the microwave heating method, the temperature control strategy is realized with aim of controlling the flow and wetting of filler alloy and the diamond/filler alloy interface reaction layer. Meanwhile, a mechanical dispersion assisted with electrostatic field is also proposed to disperse the diamond grits before brazing. Based on the whole solution, the main researching points are:. Clearing the varying regularity of the temperature filed and the heat transformation mechanism of the occupancy particles heated by microwave, and the control of brazing temperature curve heated by the short-term high-heat temperature elevation strategy.. Matching particle sizes including occupancy particles, diamond grits and filler alloy powder with the consideration of the brazed grit joint shape and the grits inter chip storage space.. Revealing the fusion and wetting of filler alloy during brazing, including spreading within micro-gap and the formations of the protrusion shape brazed grit and the grits inter chip storage space. . Revealing the diamond/filler alloy interfacial formations and bonding mechanism, including microstructures, morphologies and thickness. . Establishing the thickness of interfacial reaction layer and its effect on the girt wearing performance.. Based on the above research work and with the consideration of engineering application, the whole solution is comprehensively verified and optimized with a serial of typical brazed milling heads and brazed grinding wheels, including brazing preparation, contour geomorphology characterization and grinding performance evaluation.