Core material for hot-compacted low-temperature roasted mold cores and method for manufacturing mold cores by adopting core material

The invention provides a core material for hot-compacted low-temperature roasted mold cores and a method for manufacturing mold cores by adopting the core material. The core material is characterized by comprising the following components in parts by weight: ammonium dihydrogen phosphate: 3.5-15, monomagnesium phosphate: 0.5-8, quartz and/or fused quartz: 52-71, magnesium oxide: 1.2-10 and paraffin: 13-26; and then the core material is hot-compacted, enchased, roasted and dipping-strengthened to obtain the mold cores. The core material for hot-compacted low-temperature roasted mold cores and the method for manufacturing mold cores by adopting the core material are easy to operate and control, not only investment casting mold cores which are thin, precise, smooth in surface, accurate in size and low in cost can be manufactured, but also manufacture cost of the mold cores is low, and further the mold cores can be produced by investment casting factories in self-actuated, large-batch and high-efficient mode.