| Project/Area Number |
11650785
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
化学工学一般
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| Research Institution | Osaka Prefecture University |
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Principal Investigator |
SATOH Munetake Osaka Prefecture University, College of Engineering, Professor, 工学研究科, 教授 (80081355)
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| Co-Investigator(Kenkyū-buntansha) |
IWASAKI Tomohiro Osaka Prefecture University, College of Engineering, Research assistant, 大学院・工学研究科, 助手 (50295721)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1999: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | Composite material / Fine mixing / Plastic deformation / Discrete element method / Melt injection test / Shear test / Agitation granulation / Compression forming / 粒子複合化 / 材料試験 / 表面改質 / メカニカルアロイング |
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| Research Abstract |
We have proposed the method for estimating experimentally the net energy applied to the particles in equipment for compounding the particles. In the method, the spherical copper particles, of which the stress-strain relation is known, are used as the standard material. The method has been applied to a high-speed elliptical-rotor-type powder mixer (HEM) to which Zirconia beads were added to aid stress transmission. The net applied energy has been estimated by measuring the deformation of copper particles after processing under various operating conditions. To investigate the energy transmission from the elliptical rotor to the particles via the beads, the motion of beads has been analyzed by using the discrete element method. By utilizing the results of experiment and calculation, the composite particles with a desired feature (shape, surface condition, size distribution, etc.), which consists of fine alumina particles (guest particles) and copper particles (host particles), can be prep
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ared. The green body of which the internal structure is homogeneous or regular heterogeneous can be manufactured by the compression forming of the composite particles thus obtained.
Flowability of metal particles used in metal-injection-molding (MIM) process has been evaluated by performing the shear test using the rotary-intrusion-type powder rheometer with a conical rotor. The dynamic friction coefficient measured is closely related to the characteristics of melt injection of metal particles, and considerably changes after the surface modification of metal particles by the HEM.The plasticity of metal particles can be modified by controlling the surface condition of metal particles.
In the development and evaluation of powder materials including fibers, the powder-fiber interaction and the characteristics of structure of the powder-fiber mixture have been clarified by newly developed testers. The optimum features of granules of the mixture and the optimum operating conditions in the granulation have been determined. Less
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