Discuss of Bonding Mechanism of Al-Phosphate No-Bake Sand

Abstract:

Adding B-ion additive or Mg-ion additive to Al-phosphate binder to get different binders, and viscosity of Al-phosphate binders and dry strength of their no-bake sand were tested, bonding mechanism among sands of Al-phosphate no-bake sand was discussed by SEM and EDS. Results indicate that Mg-ion additive can increase binder’s viscosity and dry strength of its no-bake sand more obviously than B-ion additive, adding Mg-ion additive and B-ion additive simultaneously is more obvious. Location crack produced is changed from sand surface to binding bridge inner while adding Mg-ion additive and B-ion additive simultaneously ,and fracture mode is changed from adhesive fracture mainly to cohesive fracture mainly, dry strength is improved from 0.86MPa to 2.38MPa.

• Periodical: Advanced Materials Research (Volumes 472-475)
• Pages: 605-608
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.472-475.605
• Online since: February 2012
• Authors: Lu Xia, You Shou Zhang, Jin Huang
• Keywords: Al-Phosphate, Bonding Mechanism, Dry Strength, No-Bake Sand, Viscosity

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