摘要
为解决钎焊过程中微粉金刚石磨粒损伤严重、钎料与基体结合不牢的问题,采用合适的钎焊工艺在钢基体上钎焊微粉金刚石(325/400#),分析钎焊样件结合界面并制备磨头对氧化铝陶瓷板进行加工。研究发现:微粉金刚石磨粒损伤较小;钢基体与钎料结合界面生成物为Fe、Cr形成的γ相固溶体及Fe、Ni形成的Ni-Fe置换固溶体,固溶体的存在可保证钎料与基体之间的牢固结合;制备的钎焊微粉金刚石磨头在加工陶瓷板时拥有较长的使用寿命。
Objectives:The use of brazing micro-powder diamond tools can achieve high-precision and efficient processing of ceramic materials.However,there are currently problems such as thin brazing layers,large abrasive damage during brazing,and poor bonding between the brazing material and the base metal.Current research has not been able to analyze the brazing effect from the micro-interface.Methods:Brazing samples are prepared,and the surface morphology and the morphology of diamond abrasive particles and surface products are observed with a scanning electron microscope(SEM).The phases of the compounds on diamond are analyzed with an X-ray diffractometer.The cross-sectional structure of the brazing samples are observed with the backscattered electron imaging mode of SEM.The elemental composition of the bonding interface of the brazing samples is analyzed with an energy dispersive spectrometer(EDS).A grinding head is prepared to machine an alumina ceramic plate on a JDHGT type engraving machine,and it is compared with an electroplated grinding head.Results:The exposure height of the micro-diamond abrasive is reasonable with no accumulation.The diamond is not over-consumed,and a plate-like Cr_(3)C_(2) is generated on the diamond surface.There is sufficient elemental diffusion between the brazing alloy and the base metal.Products at the interface between the steel substrate and the brazing alloy are a γ-phase solid solution formed by Cr and Fe,and a Ni-Fe substitutional solid solution by Fe and Ni,which ensures a firm combination between the brazing alloy and the base metal.Conclusions:The life of the brazed micro-diamond head is three times longer than that of the electroplated grinding head.The situation of abrasive particle breakage and shedding in the brazed grinding head is less,and there is no phenomenon of brazing alloy layer peeling.This proves that the brazing effect of micro-diamond is better,and the method of processing ceramics with brazed micro-diamond tools is feasible.
作者
李纬
肖冰
何旭
张自立
周露露
肖皓中
LI Wei;XIAO Bing;HE Xu;ZHANG Zili;ZHOU Lulu;XIAO Haozhong(College of Mechanical&Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 210016,China)
出处
《金刚石与磨料磨具工程》
北大核心
2025年第4期479-485,共7页
Diamond & Abrasives Engineering
关键词
钎焊
微粉金刚石
磨粒损伤
界面分析
brazing
micronized diamond
abrasive grain damage
interfacial analysis
