| Full text | |
| Author(s): |
Finhana, I. C.
[1]
;
Machado, V. V. S.
[1]
;
Santos Jr, T.
;
Borges, O. H.
[2, 3]
;
Salvini, V. R.
[4]
;
Pandolfelli, V. C.
[2, 3]
Total Authors: 6
|
| Affiliation: | [1] Fed Univ Sao Carlos UFSCar, Mat Engn Dept, FIRE Associate Lab, Mat Microstruct Engn Grp GEMM, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil
[2] Santos Jr, Jr., T., Univ Fed Sao Carlos, Grad Program Mat Sci & Engn, Sao Carlos, SP - Brazil
[3] Santos Jr, Jr., T., Fed Univ Sao Carlos UFSCar, Mat Engn Dept, FIRE Associate Lab, Mat Microstruct Engn Grp GEMM, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil
[4] Coll Technol FATEC, Jordao Borghetti St 480, BR-14160050 Sertaozinho, SP - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | CERAMICS INTERNATIONAL; v. 47, n. 11, p. 15237-15244, JUN 1 2021. |
| Web of Science Citations: | 1 |
| Abstract | |
Liquid foams containing Al2O3 nanoparticles were obtained after direct foaming of a colloidal alumina suspension with ammonium stearate. These systems were stable for at least 24 h and were comprised by small cells (35 mu m). Up to 10 wt% of these foams were added to an ultrastable Al2O3-stabilised one and resulted in macroporous samples with high total porosity (>70%). Their green mechanical strength was proportional to the amount of colloidal alumina added, but lower than a composition with calcium aluminate cement. When compared with compositions prepared with colloidal alumina suspension, the colloidal foams resulted in samples with a higher number of small pores (<30 mu m) and lower linear shrinkage after firing at 1600 degrees C for 5 h (similar to 9%). Thus, colloidal alumina foams can be used for processing macroporous refractory ceramics with smaller pores, lower dimensional changes after firing and higher porosity. (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 |