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为解决金刚石工具上Cu基钎料和金刚石之间结合力弱的问题,将直流等离子体化学气相沉积(DC-PCVD)处理后的金刚石作为磨料,感应钎焊制作成金刚石工具。利用扫描电镜、能谱仪和X射线衍射仪等仪器对DC-PCVD处理前后金刚石整体形貌及其钎焊面的成分、微观形貌等进行分析研究。分析DC-PCVD处理后的金刚石表明,在其表面沉积了一层非晶碳膜;感应钎焊DC-PCVD处理后的金刚石显示,出露于钎料层外的金刚石棱边能保持良好的锋利度,金刚石钎焊面上形成均匀细小的钛碳化合物,并且碳化物之间的孔隙大小和分布都较为均匀,液态化合物充填这些化合物孔隙之间,能够增强钎料对金刚石的把持强度。用DC-PCVD处理后的金刚石磨料和原始金刚石磨料感应钎焊制成的金刚石磨头进行钻孔试验显示,DC-PCVD处理后的金刚石整体破碎率和脱落率都较低。
In order to solve the problem that the bonding force between the Cu-based filler metal and the diamond on the diamond tool is weak, diamond treated by direct current plasma chemical vapor deposition (DC-PCVD) is used as an abrasive and the induction brazing is made into a diamond tool. The morphology, surface composition and microstructure of the diamond before and after DC-PCVD treatment were analyzed by SEM, EDS and X-ray diffraction. Analysis of diamond after DC-PCVD treatment showed that an amorphous carbon film was deposited on the surface of the DC-PCVD diamond. Induced brazing of diamond after DC-PCVD treatment showed that diamond edges exposed outside the brazing filler metal could maintain sharp sharpness Degrees, the formation of diamond brazed uniform fine titanium carbon compounds, and the size and distribution of the pores between the carbide are more uniform, liquid compounds filled between the pores of these compounds, can enhance the brazing strength of the solder on the diamond. The results of drilling tests show that the DC-PCVD treated diamonds have lower overall rate of crushing and falling off, compared with those of DC-PCVD treated diamonds and raw diamond abrasive induction brazed diamonds.