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从1979年开始,我厂在部分中、大型铸钢件砂芯上采用了常温自硬呋喃树脂砂新工艺,收到了砂芯自硬、强度高、尺寸准、芯骨简便、制芯效率提高、退让性和溃散性好、清砂方便、扬尘减少、能源节约以及铸件质量提高等效果。但是,树脂砂高温强度的持续时间较短,溃散速度较快,容易产生粘砂和金属渗透(俗称“钢夹砂”)的缺陷,所以对涂料的要求比较高。开始,我们应用了国外在铸钢树脂砂上普遍使用的锆英粉涂料,收到了预期
Since 1979, our factory has adopted new technology of room temperature self-hardening furan resin sand on the part of large-scale steel castings, and has received the advantages of self-hardening sand core, high strength, accurate size, simple and easy core-core, , Concession and collapsibility, easy sand cleaning, reduce dust, energy conservation and improve the quality of castings and other effects. However, the duration of the high temperature strength of resin sand is short, the collapse speed is faster, prone to sticky sand and metal infiltration (commonly known as “steel sand”) defects, so the coating requirements are relatively high. At the beginning, we applied the zircon powder coating widely used abroad on cast steel resin sand and received the expectation