| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1987: ¥100,000 (Direct Cost: ¥100,000)
Fiscal Year 1986: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Research Abstract |
The results of this project are summerized as follows;
1. The apparatus in laboratory scale for plating and the method of producing iron base comosite powders were established. And so, it was able to coat iron particles with nickel, nickel-phosphorus alloy, nickel-boron alloy, and the rest by electroless plating.
2. Sintering behaviors of Fe-Ni, Fe-Ni-P, and Fe-Ni-B compacts prepared with composite powders were studied by means of dilatometric method and electron probe micro analysis. Sinterings of Fe-Ni-P and Fe-Ni-B compacts were enhanced, compared with the case of Fe-Ni compact. The enhanced sinterings in the compacts were mainly took place during heating. The mechanisms of the enhanced sintering were discussed.
3. Mechanical properties of sintered Fe-Ni-P and Fe-Ni-B alloys prepared with composite powders were studied. Sintered Fe-Ni-P alloys from composite powders showed higher tensile strength and larger elongation than those of sintered alloys from mixed powders. Sintered Fe-Ni-B alloys prepared from composite powders showed equivalent tensile strength and larger elongation, compared with sintered Fe-Ni alloys from composite powders. The microstructure of sintered Fe-Ni-P alloys showed a composite structure consisted of two regions. However, sintered Fe-Ni-B alloys showed homogeneous Fe-Ni-B alloyed structure dispersed spherical pores. It was proposed that the good mechanical properties of sintered alloys from composite powders were attributed to those microstructures.
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