Factor contributing to this problem is that the metal cobalt used as the cementing phase easily causes diffusion and dissolution of carbon , promotes graphite growth and inhibits diamond nucleation and growth in the course of competitive growth between diamond and graphitic carbon 其原因是在沉積過程中,基體中所含的鈷會(huì)引起碳的溶解和擴(kuò)散,從而導(dǎo)致金剛石成核密度的降低和石墨的形成。