| 摘要 |
PURPOSE:To prepare single crystals of inexpensive diamond suited to mass production by forming a sintered body of diamond having high density from diamond powder using Co as a sintering aid and treating the sintered product by heating. CONSTITUTION:For example, a mixture of diamond powder with powdery Co as a sintering aid is formed to a sheet or to a shape of a substrate, which is then sintered in a non-oxidizing atmosphere to prepare a sintered body having high density. Then, the surface of the sintered body (i.e. a substrate) is heated in a non-oxidizing atmosphere using laser beam or electron beam. Thus, Co is melted and separated, and crystal particles of diamond on the surface of the sintered substrate are allowed to contact with each other, and the particles are further grown by welding to form single crystals, such as a single crystal substrate. Since, by this method, diamond single crystals are obtd. from diamond powder without using superhigh pressure device in a short time, the method is suited to inexpensive mass production of diamond. |
