工艺条件对氧化铍凝胶注模坯体强度的影响

摘要

The effect of process conditions（monomer concentration,monomer/crosslinker ratio,reaction temperature and solids loading of suspension）on strength of green body prepared by gelcasting was investigated.The change reason of the strength and homogenization of pure gels was analyzed based on free-radical polymerization theory,and the ranges of each process parameters were achieved.The results show：the strength of pure gel and green body increase with increasing monomer concentration,but the homogenization of these prepared with higher monomer concentration are decreased,and thus monomer concentration should be between 10% and 20%（mass fraction）;increasing the ratio between AM and MBAM,the strength and homogenization of gel decrease,and so the ratio between AM and MBAM is between 20∶1 and 30∶1;as the reaction temperature rises,the strength of gels enhance firstly and then decrease,but vice versa the homogenization of these,therefore,the reaction temperature lies between 20℃ and 30℃;the strength of green body reduce but homogenization increase with solids loading,and so the solids loading of suspensions for green body with enough strength should be as much high as possible.%研究单体浓度（AM）、单体/交联剂比例（AM/MBAM）、反应温度和固相体积分数等工艺条件对氧化铍凝胶注模坯体强度的影响,并从自由基聚合反应角度分析各因素对纯凝胶强度和均匀性的影响的原因,得出各因素较合适的参数范围。结果表明纯凝胶和坯体强度随着单体浓度的增加而增加,但过高的单体浓度会使结构均匀性变差,因此单体浓度较合适的范围为10%～20%（质量分数）;随着AM/MBAM比例的增加,坯体强度降低,均匀性下降,AM/MBAM比例应控制在20∶1与30∶1之间;随着反应温度的升高,凝胶强度起初逐渐减低而后又升