METHOD FOR FINE GRANULATION OF POWDER, METHOD FOR SURFACE COATING OF POWDER, AND SURFACE-COATED POWDER

• Main Authors: OKAMURA MITSUHIRO, NAKAJIMA JUNJI
• Format: Patent
• Language: English
• Published: 05.11.2009
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CRUSHING, PULVERISING, OR DISINTEGRATING; CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PREPARATORY TREATMENT OF GRAIN FOR MILLING; THEIR RELEVANT APPARATUS; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a method for fine granulation of a powder and a method for surface coating of a powder which are capable of preventing occurrence of a problem caused in the fine granulation process of a first powder and evenly depositing the first powder to the surface of a second powder while suppressing agglomeration of the first powder and pulverization of the second powder. SOLUTION: A second powder with higher hardness than that of a first powder and a liquid are mixed to produce a slurry S in a container 104. Successively, the slurry S in the container 104 is irradiated with ultrasonic waves by using an ultrasonic oscillator 101 to finely granulate the first powder. In this case, the second powder works as a fine granulation medium for the first powder. Next, when the slurry S is dried, the finely granulated first powder is deposited on the surface of the second powder by the surface tension of the liquid at the time of drying. Consequently, the surface of the second powder is evenly coated with the first powder. COPYRIGHT: (C)2010,JPO&INPIT