添加剂对水玻璃热性能的研究-论文.docVIP

添加剂对水玻璃砂热性能的研究 摘要 减少铸造工业对环境的污染，实现绿色清洁的铸造生产，已成为国内外铸造工作者的迫切任务。相比于粘土砂产生的粉尘污染与黑色污染，树脂砂产生的化学污染，水玻璃砂工艺是最有可能实现绿色清洁铸造生产的型砂工艺。 水玻璃砂由于具有强度高、成本低、工艺要求简单、环境友好等优点，使它在铸造业成为了被广泛使用的造型材料之一。水玻璃价格便宜，供应充沛，混砂、造型和浇注过程中不释放出刺激和有害的气体，易于实现清洁生产。 但水玻璃砂浇注后溃散性差，旧砂回用困难，大多直接废弃，造成环境的碱性污染。要想解决水玻璃砂的溃散性差问题，应从水玻璃砂溃散性的机理研究着手，分析水玻璃砂溃散性差的原因，才能找出解决溃散性差的合理的方法。 本课题研究添加剂对水玻璃砂热性能的影响，利用热分析实验研究了添加剂对溃散性的影响，并对实验结果进行分析，确定了添加剂对水玻璃砂不同温度段吸放热的影响趋势，并且对最佳型砂配方进行了验证。结果表明，采用加入添加剂的水玻璃型砂，溃散性良好。 关键词：铸造，水玻璃砂，dditive on thermal properties of sodium silicate sand ABSTRACT Nowadays, it is becoming an urgent task for foundry works both at home and abroad to reducing pollution, realizing cleaner production. Compared to clay sand,sodium silicate sand has no dust pollution and black pollution. What’s more, it does not exsits chemical pollution, compared to resin sand. So,sodium silicate sand is a molding process,which is most likely to achieve green production. Sodium silicate sand has become one of the widely used modeling materials, for its high strength,low cost,simple technological requirements. Sodium silicate is cheap, abundant,and does not release noxious gas when molding and casting. However,sodium silicate sand has a poor collasibility after casting. It is difficult to recycle,which results in many sands abandoned. The abandoned sands may bring alkaline plollution. In order to solve the problem of collapsibility of sodium silicate bonded sand, we have to research the mechanism,and analyse the reason why the collapsibility of sodium silicate sand is not what we want. The research additive effect of sodium silicate sand thermal properties, using thermal analysis experiments to study the effects of additives on collapsing and to analyze the results to determine the different temperature ranges of additives for heat absorbing the impact of sodium silicate sand trend, and to the best sand formula verified. The results showed that the use of additives in the water glass sand, collapsing good. Key words: casting, t