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Vol.57, No.12, 808 ~ 817, 2019
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| Title |
| Effect of P/Al Molar Ratio and Curing Conditions of CBAPC Binder on Flexural Strength and Moisture Resistance of Artificial Sand Core |
| 오현곤 Hyeon Gon Oh , 박동국 Dongkook Park , 김양도 Yangdo Kim , 이만식 Man Sig Lee |
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| Abstract |
| CBAPC (chemically bonded aluminum phosphate ceramic) binders have various advantages, including superior corrosion resistance and strength at high temperature. They are also a non-toxic and eco-friendly material. We investigated an inorganic binder based on CBAPC using artificial sand for casting. The CBAPC binders were synthesized with various P/Al molar ratios from 2.0 to 6.0. Specimens were prepared by mixing the artificial sand and CBAPC binder, and then heat-treating at 260 ℃ for 10 min. The prepared CBAPC binders were characterized using TGA/DSC, XRD, FT-IR, and FE-SEM. The artificial sands (Esperal 40, Cps 1) were characterized by XRF, grain size analysis, and FE-SEM. The ultimate flexural strengths obtained for the artificial sands (Esperal 40, Cps 1) were 6.40 and 6.36 MPa, respectively, under the conditions P/Al=4.5, curing temperature=260 ℃, and curing time=10min. The CBAPC_4.5 had higher thermal stability at low temperature than the samples with other P/Al molar ratios. The AlH2P3O10 · 2H2O structure formed at 260 ℃ exhibited high mechanical strength and moisture resistance with improved flexural strength. The effect on the surfaces of the CBAPC_4.5 coated artificial sands depended on the curing temperature and curing time. We confirmed that the P/Al molar ratio and curing conditions strongly affected flexural strength.
(Received August 28, 2019; Accepted November 18, 2019) |
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| Key Words |
| artificial sand, casting, CBAPC binder, flexural strength, moisture resistance |
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