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为了提高金刚石表面浸润性和焊接性,使金刚石与胎体实现牢固冶金结合,采用金刚石化学气相沉积(CVD)表面金属化的方法来改善金刚石表面性质。通过扫描电镜和能谱分析仪对金刚石表面金属化层进行表面形貌和成分分析;同时采用金属化处理的80目金刚石、综合性能较好的球形硬质合金和低熔点合金粉末以及新型焊接用粘结剂A2B,按照一定的配比制成堆焊焊条,进行钢齿牙轮钻头材料表面堆焊强化处理和耐磨性试验研究。结果表明:①采用CVD在金刚石表面沉积一层较厚的合金层,既保证了包覆的均匀性,也可以避免金刚石的多次高温受热,降低发生金刚石石墨化的几率;②CVD金属化层组织均匀、致密,镀层主要成分为Ni元素;③含有CVD金属化金刚石的自制焊条堆焊后总磨损量仅为江钻焊条的27.27%,耐磨性能非常好;④金刚石CVD金属化能够对金刚石表面进行改性,实现金属化金刚石、硬质合金和基体之间的良好结合。
In order to improve the wettability and weldability of the diamond surface, the diamond and the carcass are firmly metallurgically bonded, and the surface properties of the diamond are improved by the surface metallization of diamond chemical vapor deposition (CVD). Scanning electron microscopy and energy spectrum analyzer were used to analyze the surface morphology and composition of the diamond surface metallization layer. At the same time, metallized 80 mesh diamond, spherical cemented carbide and low melting point alloy powder with good comprehensive properties and new welding Binder A2B, according to a certain ratio made of surfacing electrode, the surface treatment of steel gear cone bit surfacing material and abrasion resistance test. The results show that: (1) Depositing a thick alloy layer on the diamond surface by CVD not only ensures the uniformity of coating, but also avoids multiple high temperature heating of diamond to reduce the probability of graphitization of diamond; (2) Uniform and dense, the main component of the coating is Ni element; ③ self-made electrodeposited with CVD metallized diamond is only 27.27% of the total amount of wear-resistant electrode after surfacing, wear resistance is very good; ④ diamond CVD metallization on the diamond surface Modified to achieve a good combination of metallized diamond, cemented carbide and matrix.