对比分析了刚玉粉、α-Al2O3粉、γ-Al2O3粉和活性碳粉4种埋粉条件下热脱脂机理、传质途径和脱脂速率。结果表明当埋粉为高比表面积的活性碳和γ-Al2O3时,液相传质在低分子量粘结剂脱除的整个过程中起主导作用,而对于低比表面积的刚玉粉和α-Al2O3埋粉,液相传质主要存在于起始阶段,中、后期以气相传质为主。扩散传质方程描述了空气气氛、刚玉粉和α-Al2O3低比表面积埋粉的热脱脂过程。计算了热裂解、氧化裂解和液相挥发3种传质途径下气相产物在坯体内的扩散过程的综合扩散系数。 The thermal degreasing mechanism, mass transfer path and degreasing rate under four kinds of burying powders of emery powder, α-Al2O3 powder, γ-Al2O3 powder and activated carbon powder were comparatively analyzed. The results show that the liquid mass transfer plays a leading role in the removal of low molecular weight binders when burying activated carbon with high specific surface area and γ-Al2O3, while for low specific surface area of ​​emery and α-Al2O3 Buried powder, liquid mass transfer exists mainly in the initial stage, in the late gas-phase mass transfer-based. The diffusion mass transfer equation describes the thermal degreasing process of air atmosphere, emery powder and α-Al2O3 low specific surface area. The diffusion coefficients of gas phase products in the green body during thermal cracking, oxidative cracking and liquid phase volatilization were calculated.