Calcium aluminate cement aqueous suspensions as binders for Al2O3-based particle stabilised foams

Author(s)

Santos Jr, T. ; Machado, V. V. S. ^[1] ; Borges, O. H. ^[1] ; Salvini, V. R. ^[2] ; Parr, C. ^[3] ; Pandolfelli, V. C. ^[1]

Affiliation

^[1] Santos Jr, Jr., T., Fed Univ Sao Carlos UFSCar, Mat Engn Dept, FIRE Associate Lab, Grad Program Mat Sci & Engn PPGCEM, Mat Microstruc, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Coll Technol FATEC, Jordao Borghetti St 480, BR-14160050 Sertaozinho, SP - Brazil

^[3] FIRE Associate Co, Imerys, Imerys Technol Ctr ITC Lyon, Le Chatelier St 1, ZAC Parc Technol, F-38090 Vaulx Milieu - France

• Document type: Journal article
• Source: CERAMICS INTERNATIONAL; v. 47, n. 6, p. 8398-8407, MAR 15 2021.
• Web of Science Citations: 0

Abstract

Macroporous refractory ceramics were prepared with Al2O3-based particle stabilised foams in which ceramic particles were partially hydrophobized with propionic acid or L-leucine. Calcium aluminate cement (CAC) as dry powder or stable aqueous suspension were added as binders. Cement addition resulted in solid foams whereby setting took place in less than 24 h. Highly porous samples were attained with leucine-based foams whereas the propionic-acid ones were not stable after CAC addition. For leucine-based foams, fired samples with homogeneous microstructures, both high porosity (similar to 80%) and cold crushing strength (similar to 30 MPa) were attained when CAC aqueous suspension was used instead of CAC dry powder. These results were associated to the better dispersion of cement particles in the foam structure when CAC liquid binder was used and pointed out the advantages of this suspension for producing solid macroporous ceramics based on particle-stabilised foams. (AU)

• FAPESP's process: 18/07745-5 - Dimensional control of Macroporous ceramics by in situ CA6 formation
• Grantee: Otávio Henrique Borges
• Support Opportunities: Scholarships in Brazil - Master