Effect of processing conditions on the properties of recycled cathode ray tube glass foams
authors Barbosa, ARJ; Lopes, AAS; Sequeira, SIH; Oliveira, JP; Davarpanah, A; Mohseni, F; Amaral, VS; Monteiro, RCC
nationality International
author keywords Cathode ray tubes; Glass foams; Sintering; Porosity; Compressive strength; Thermal conductivity
abstract Cathode ray tube glass waste was used to produce glass foams by a powder sintering route. The glass waste powder was mixed with small amounts (5 and 8 wt%) of coal fly ash, which acted as foaming agent, and the compacts of the mixed powders were heated at different sintering temperatures in the range 600-800 A degrees C for various dwell times (30-120 min). The effect of the different processing conditions on the microstructural characteristics (porosity, pore size and pore size distribution), mechanical resistance and thermal conductivity of the produced foams was investigated. The volume of pores tended to increase with sintering temperature and time, and glass foams (with a porosity higher than 50 %) were only achieved after sintering at 750 A degrees C. The average pore size increased with sintering temperature and dwell time, and pore growth was particularly accentuated at 800 A degrees C, where coalescence of the pores occurred, with a consequent decrease in compressive strength. Selected combinations of the sintering temperature, dwell time and foaming agent led to glass foams with a satisfactory microstructural homogeneity, which exhibited mechanical strength and thermal conductivity values similar to commercial foams used as thermal insulating materials.
publisher SPRINGER
issn 1380-2224
year published 2016
volume 23
issue 6
beginning page 1663
ending page 1669
digital object identifier (doi) 10.1007/s10934-016-0227-7
web of science category Chemistry, Applied; Chemistry, Physical; Materials Science, Multidisciplinary
subject category Chemistry; Materials Science
unique article identifier WOS:000387111500027
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