七O砂攻关协调会议于1978年11月25日至29日在戚墅堰召开。会议期间,针对缩沉和蚯裂形成机理和解决办法进行讨论。应用X光衍射对烧结层岩相进行分析,证实化学侵蚀性(由于FeO的渗透生成的CF和C_2F)位移形成后,才产生压缩性位移,于是出现缩沉。采用涂料和型砂中添加附加物等措施有防止缩沉的效果。天重厂、戚墅堰机车车辆厂对涂料选材进行工作。与会代表对天重厂《快干涂料的探讨》的报告很感兴趣。认为合理使用涂料是 Seven O sand tackling coordination meeting was held on November 27, 1978 at Qishuyan. During the meeting, for the sinking and the formation of the mechanism and solutions to discuss the solution. X-ray diffraction was used to analyze the lithofacies in the sintered layer, and it was confirmed that the compressive displacement occurred only after the formation of chemical aggressiveness (CF and C 2 F due to the infiltration of FeO), resulting in the collapse. The use of paint and sand to add additional measures to prevent shrinkage effect. Day heavy factory, Qishuyan rolling stock plant on the selection of materials for work. The delegates were very interested in the report of “Heavy Duty Coatings” researched by TSP. Think that the rational use of paint is