Preparation method for low-expansion graphite material

The invention discloses a preparation method for a low-expansion graphite material which is mainly prepared from spheroidal synthetic graphite powder and asphalt. The preparation method comprises thefollowing process steps: grinding, reshaping, screening, batching, mixing and kneading, isostatic-pressure forming, roasting, graphitizing and the like, thereby obtaining the low-expansion graphite material. The preparation method for the low-expansion graphite material is simple to operate, sufficiently utilizes resources, is high in yield, reduces the cost, and has good thermal expansion resistance. 本发明公开了种低膨胀石墨材料的制备方法。主要原料包括球型人造石墨粉与沥青，依次经过磨粉、整形、筛分、配料、混捏、等静压成型、焙烧、石墨化等工艺步骤后制得低膨胀石墨材料。本低膨胀石墨材料制备工艺操作简单，充分利用资源，成品率高，节约成本，且具有良好的耐热膨胀性。