Abstract
Effect of particle size of Al (OH)3 and Mg-containing modifier of binder and hardener on the dry strength and storage stability of high neutralization degree phosphate-bonded no-bake sand were studied. Results show that particle size of Al (OH)3 has little effect on the dry strength and storage stability when its varieties are 4.552 μ m toothpaste-grade Al (OH)3 and 6.136μm industrial special Al (OH)3, 6.136μm industrial special Al (OH)3 is more appropriate in consideration of cost and source. Adding Mg-containing modifier to binder code 32B8M15B cannot improve the dry strength and storage stability, but adopting compound modifier, 2% fused magnesia powder+2% iron powder+4% copper powder ,can obtain better properties , dry strength can reach 3.022MPa, and the minimum strength is above 1MPa with humidity fluctuation from 21%RH to 60%RH in 18 days.
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