Flexible polyurethane foams as templates for cellular glass–ceramics

✍ Scribed by M.W. Quintero; J.A. Escobar; A. Rey; A. Sarmiento; C.R. Rambo; A.P. Novaes de Oliveira; D. Hotza

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 694 KB
• Volume: 209
• Category: Article
• ISSN: 0924-0136
• DOI: 10.1016/j.jmatprotec.2009.03.021

✦ Synopsis

In this work flexible polyurethane (PU) foams were obtained with varying air permeability, cell diameter and morphology. The addition of up to 1.5 g anti-foamer with a mixing time of 75 s resulted in larger cell diameters, higher air permeability and lower distorted area. PU foams obtained were used as templates to produce glass-ceramic (GC) foams by the replication method. Glass powder of the LZSA (Li 2 O-ZrO 2 -SiO 2 -Al 2 O 3 ) system was used to infiltrate the PU foams. The retention capacity of the ceramic suspension in PU foam is increased with a reduction of the cell diameter. In contrast, the infiltration capacity increases with raise of the cell diameter. The permeability reduction of GC foams with respect to PU foams varied from 3% to 25% when 2.7 and 0.8.0 mm cell diameters were used, respectively. The results of mechanical characterization were coherent with the morphological characteristics in both PU and GC foams.