| 摘要 |
Among materials that can be obtained on Earth, diamond is a superior general purpose raw material, but diamond lacks workability and a large market could not be developed. Faceting of precious diamonds is known to be commonly performed with good efficiency by self-abrasion, but using molecular dynamics, it became clear that a rate-determining phase at the molecular level for self-abrasion is sp3-sp2 ordered-disordered transition on a crystal surface, that a surface amorphous layer is generated thereby and that the chemical decomposition thereof is the mechanism for facet cuts. Here, a self-abrasion apparatus wherein the action of self-abrasion works with priority not on mechanically strong crystal surfaces within a diamond crystal, but on weak points such as vertices and edges was designed. Spherical diamond is a new and promising diamond raw material that lacks self-aggregating properties, has strong resistance against shocks leading to cleavage and has chemically stable surfaces. |
