| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.29 ( November 1993 ) Special Issue on Iron Power ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Segregation-Free KIP CLEAN MIX Powders Toshiyuki Minegishi, Kiyoshi Makino, Hiroshi Sugihara, Yoshiaki Maeda, Shigeaki Takajo, Ichiro Sakurada |
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Synopsis : New mixed powders, KIP CLEAN MIX, were developed to minimize segregation and dusting by a treatment which firmly bonds graphite and other additive powders onto the surface of the iron powder particles. The segregation-free treatment gives a C-adhesion ratio (the ratio of carbon content in 100`200-mesh powder mixtures to carbon content in the total powder mixtures) of more than 80%, while the ratios remained about 20% for conventionally mixed powders. Dusting was also reduced by 90% and flowability was improved by more than 30%. Excessive graphite concentration usually observed in the final stage of feeding from a hopper is completely suppressed by this treatment. Mechanical properties of sintered compacts made from KIP CLEAN MIX powders being very stable, substandard articles were decreased and the yield of sintered parts was improved by about 10%. |
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