Preparation process of short carbon fiber reinforced silicon-based ceramic core based on nitrogen protection

The invention discloses a short carbon fiber reinforced silicon-based ceramic core preparation process based on nitrogen protection, which comprises the following steps: firstly, carrying out surface treatment on original short carbon fibers, dispersing the original short carbon fibers in an ethanol solution, adding ball-milled ceramic powder into the short carbon fiber-ethanol solution, and uniformly stirring to obtain a mixed solution; adding the dried short carbon fiber-containing ceramic powder into a molten plasticizer, stirring to prepare ceramic slurry, pressing a short carbon fiber-reinforced silicon-based ceramic core green body by using a hot-press casting method, trimming, burying in a refractory sagger containing aluminum oxide powder, and roasting in a tubular atmosphere furnace into which nitrogen is introduced; nitrogen atmosphere is adopted to protect the sintered short carbon fibers to enhance the performance of the silicon-based ceramic core, due to the fact that the roasting process is in a