湿型用防粘砂、抗夹砂附加物3R粉的研究

The Investigation of the Addition 3R Powder to Prevent Metal Penetration and Scab for the Green sand

研究了Ｒ１、Ｒ２、Ｒ３的性能及其配制的型砂常温和高温性能，进而优化出由Ｒ１、Ｒ２、Ｒ３组成的３Ｒ粉。由３Ｒ粉和煤粉配制的型砂进行了常温和高温性能的比较。结果表明，３Ｒ粉型砂性能优于煤粉砂性能。３Ｒ粉不但光亮碳生成率高，而且可以提高型砂的热湿拉强度和降低热压应力，延长型砂的爆热起皮时间。３Ｒ粉对膨润土的毒化作用小。经浇注试验表明３Ｒ粉有较好的防粘砂、抗夹砂效果。

The properties of R1,R2 and R3 were studyed in the meantime their molding sands room temperature properties and high temperature properties were tested when R1,R2 and R3 in the molding sands respectively, then 3R powder consist of R1,R2 and R3 was optimized. In this paper the seacoal's molding sand, room temperature properties and high temperature properties were compare with that of the 3R's molding sand the result of the properties of the 3R's molding sand is superior to that of the seacoal's 3R not only has higher lustrous carbon productive ration but also can improve the molding sand green thermal strenth prolong the high temperature crack time, decrease the thermal compression stress. 3R is hardly to poison bentonite and the produtive tests indicate: 3R has nice effect in preventing metal penetration.