| 摘要 |
<p>Diamond abrasive particles which are prepared from a diamond synthesized under a static extra-high pressure, have a heat-affected structure formed by a heat treatment at 1000 °C or higher, comprise a nonagglomerative aggregate of fine single diamond crystal particles having a mean particle diameter (D 50 value) of 5 mum or less, and have a diamond surface covered with 0.5 mass % relative to the whole diamond particle of a non-diamond carbon; and a method for preparing modified diamond abrasive particles, characterized in that diamond particles having a mean particle diameter (D 50 value) of 50 nm or more are heat-treated at a temperature of 1000 °C or higher in a non-oxydizing atmosphere or under vacuum so that the surface of the diamond particles are partially converted to a non-diamond carbon. The aforementioned diamond abrasive particles and a method for preparing modified diamond abrasive particles provide abrasive particles of fine single crystal type which are prepared from a diamond synthesized under a static extra-high pressure and, in spite of that, satisfy all of the following requirements for abrasive grains for use in slurry processing: (1) a large amount of a material can be processed in a unit of time, (2) the surface roughness of a processed surface is small, and (3) when a soft material is processed, the number of abrasive grains remaining on a processed surface is small, and a method of preparing such particles.</p> |
