Study on the Storage Stability of High Neutralization Degree Phosphate-Bonded No-Bake Sand

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.

• Periodical: Advanced Materials Research (Volumes 941-944)
• Pages: 981-985
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.941-944.981
• Online since: June 2014
• Authors: Lu Xia*, Wei Long, You Shou Zhang, Jin Huang, Bu Song Hu
• Keywords: Compound Hardener, Mg-Containing Modifier, Particle Size of Al (OH)₃, Phosphate-Bonded No-Bake Sand, Storage Stability

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