| 摘要 |
PROBLEM TO BE SOLVED: To obtain a compsn. for mechanical parts excellent in cutting and grinding property and grinding accuracy by mixing hydraulic powder and non- hydraulic powder having a smaller average particle size than that of the hydraulic powder in a specific ratio and then compounding the specified proportion of a formability improving agent to the mixture powder. SOLUTION: Hydraulic powder by 50 to 90 wt.% is mixed with non-hydraulic powder by 10 to 50 wt.% having a smaller average particle by one order or more than the average particle size of the hydraulic powder. Then to 100 pts.wt. of the mixture powder, 2 to 18 pts.wt. of a formability improving agent is compounded to prepare a hydraulic compsn. for mechanical parts. As for the hydraulic powder, portland cement powder or the like is used and as for the non-hydraulic powder, silica fume powder or the like is used. As the formability improving agent, a vinyl acetate.acryl copolymer resin or the like is used. As other additives, an aggregate such as silica sand as a filler, a ceramic forming auxiliary to improve the formability and silicone oil as a water repellent can be used. |
