| abstract |
The present invention provides a hydraulic composition for an additive manufacturing apparatus, which has high strength development properties, particularly early strength development properties, and has few defects due to gas or poor graphite spheroidization. The composition for an addition production apparatus of the present invention comprises 100 parts by mass of a binder containing at least 50 to 100% by mass of the following (A) calcium aluminate, and 0 to 50% by mass of the following (B) cement. It is a ment composition containing 100 to 400 parts by mass of sand with respect to parts. (A) Calcium aluminate: CaO / Al2O3 molar ratio is 1.5 to 3.0 (B) Cement: Calcium silicate content is 25% by mass or more (however, the total content of calcium aluminate and cement) Is 100% by mass.) [Selection] Fig. 1 |