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目的寻求一种合成金刚石大单晶的有效方法。方法采用在金刚石单晶上面电镀一层金属镍膜作为触媒,镀有镍膜的金刚石晶种被规则地放在石墨片上预先刻好的洞中,每两个洞之间保持相等的间距,然后与其他石墨片交替组装在高温高压下进行实验合成。结果实验结果表明,在合成压力、温度和时间分别~5.8 GPa、~1 460℃和14 min的条件下,合成后的单晶尺寸约是原晶种的3倍。与传统的合成工艺相比较,合成后的金刚石单晶具有较好的形貌与质量。结论采用电镀晶种法合成对高品级金刚石大单晶的合成具有一定参考意义。
Objective To find an effective method for synthesizing large single crystal diamond. The method uses a layer of metallic nickel film as a catalyst on the diamond single crystal. The diamond seeds plated with the nickel film are regularly placed in the pre-engraved holes on the graphite sheets with the same spacing between every two holes, and then Alternately assembled with other graphite sheets under high temperature and pressure for experimental synthesis. Results The experimental results show that the synthesized single crystal size is about three times that of the original single crystal under the conditions of pressure, temperature and time of 5.8 GPa, ~ 1,460 ℃ and 14 min respectively. Compared with the traditional synthesis process, the synthesized diamond single crystal has better morphology and quality. Conclusion The synthesis of electroplating seed crystals has certain reference value for the synthesis of high-grade diamond single crystal.