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Suzuki Hiroyuki Y.,Kuroki Hidenori 대한금속재료학회 2004 METALS AND MATERIALS International Vol.10 No.2
A new compacting method for powder materials is presented. High-speed Centrifugal Compaction Process (HCP) utilizes centrifugal force of about 10,000 g for the compaction. WCP is suitable for net shape compaction of fine sub-micron and nano-powders. HCP possesses a unique compacting mechanism that is different from other colloidal processes including Pressure Casting (PC), and has a number of useful characteristics. HCP has a higher compacting speed than PC, wide applicability for net shape formation, as well as a defect removing function. Because of homogeneous and flawless green microstructure, HCP alumina shows superior sinterability and higher strength and hardness than most of other aluminas.
Flow Patterns in Green Bodies Made by High-Speed Centrifugal Compaction Process
Suzuki Hiroyuki Y.,Urabe Katsuaki,Takano Tomoki,Kuroki Hidenori 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
High-Speed Centrifugal Compaction Process (HCP) is a wet compacting method, in which powders are compacted under a huge centrifugal force. The HCP was well applied to small alumina specimens, but the compact easily cracked when we applied the HCP to other materials. We clarified how the cracks introduced and found that the formation of such a flow pattern was related to the Colioli's force in the centrifugal field.
Compaction of Ultra-fine WC Powder by High-Speed Centrifugal Compaction Process
Suzuki Hiroyuki Y.,Kadono Yuichi,Kuroki Hidenori 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
High-Speed Centrifugal Compaction Process is one of slip-using compacting method originally developed for processing of oxide ceramics. In this study, we apply the HCP to ultra-fine (0.1 micron) WC powder. Organic liquid of heptane was chosen as dispersing media to avoid possible oxidation of WC. The mixing apparatus was a key to obtain dense compacts. Only the slips mixed by high energy planetary ball mill were packed up to 55% by the HCP, and sintered to almost full density at 1673 K without any sintering aids. This sintered compact marked Vickers hardness of Hv 2750 at maximum.