| 摘要 |
<p>[Problem] To provide: a process of producing a hard particle provided with a surface treatment coating, which can be produced by forming a uniform surface treatment coating on the surface of an inert hard particle such as a diamond particle and a CBN particle employing a wet-mode technique that can be achieved at low cost, and which has good dispersibility; and others. [Solution] A hard particle (1) provided with a surface treatment coating is produced by a process comprising: a step of preparing a hard particle (2) having a Knoop hardness of 1000 or more; a step of holding the hard particle (2) in an aqueous solution containing a fluoride complex of at least one metal selected from Zr, Ti, Si, Cr, Ta, Hf, Sn, Mo, W, Zn, In and V to form a film (3') containing a hydrated oxide of the metal on the surface of the hard particle (2); and a step of drying the hard particle on which the film (3') containing the hydrated oxide of the metal has been formed. It is preferred that a step of bringing the particle into contact with an aqueous solution containing a phosphorus compound is provided between the hydrated-oxide-containing film formation step and the drying step.</p> |
