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在化学气相沉积(CVD)制备炭/炭复合材料的过程中,对采用强制通过毛坯的特定装炉方式下的碳源气体的流动动力学及其反应机理进行系统的理论分析。在一系列的计算基础上,得到毛坯内部空腔压强、毛坯外部空腔压强和毛坯的孔隙度随时间变化的微分方程模型,求出气体在炉体的滞留时间以及渗透毛坯的时间。该理论计算所得的CVD过程中毛坯孔隙度变化与实际生产过程中的孔隙度变化趋势一致,表明该研究理论分析结果具有较高的可信度。
In chemical vapor deposition (CVD) preparation of carbon / carbon composites, a systematic theoretical analysis of the flow kinetics and reaction mechanism of a carbon source gas using a specific loading mode forced through the blank was performed. On the basis of a series of calculations, the differential equation model of the cavity internal cavity pressure, the cavity external cavity pressure and the porosity of the blank as a function of time is obtained, and the residence time of the gas in the furnace body and the time of penetrating the blank are obtained. The change of the porosity in the CVD process calculated by this theory is consistent with the trend of the porosity in the actual production process, indicating that the theoretical analysis results of the research have high credibility.