Gas Evolution Qualitative Analyses From Modified Cellulose Mixtures During Thermal Degradation in Air and Argon

Abstract

This paper presents the application of mineral additives, such as expanded perlite, expanded vermiculite and microspheres in items used in founding. Mixed with paper pulp and aluminosilicate resin as a binder, these additives are the base of a mixture patented by the authors, which can be used in the production of pipe shapes and connectors with a circular cross-section in casting systems in the founding industry. These mixtures were subjected to TG thermal degradation during which a quantitative analysis of the emitted fumes was carried out. The analysis did not detect any other compounds than those formed by the combustion of cellulose materials, which indicated that no chemical reaction took place between the applied additives and cellulose at high temperatures.

The gas evolution of a modified cellulose mixture used for gating systems in the no-bake mould process

“…Such summaries show which temperatures and sample mass losses correspond to the gas products which appear. The analysis of samples using the TG-DTG method detected no CH 4 ,-one of the decomposition products of cellulose included in all of the products [8,23,[26][27][28][29][30]-which should be explained by the difference in absolute mass in the test method. In addition, the samples for the TG-DTG analysis were subjected to grinding, which could facilitate the reduction of CH 4 to carbon dioxide or carbon monoxide in this scale and at relatively high gas flows.…”

“…5, 6, 7), it is possible to notice CO, CO 2 and CH 4 compoundsthe products of cellulose decomposition. In the case of the commercial sample, it is possible to see that the emission of CH 4 has a peak with characteristics different to those of own samples, which results from the decomposition of the organic resin [9,10,[27][28][29]. In addition, in the fixed-bed pyrolysis test method, it is possible that CH 4 was identified as part of another organic compound with higher molecular weight.…”

Archives of Metallurgy and Materials

“…The investigated mixtures might be considered as alternative solutions to making gating systems which allow liquid metal flow into no-bake moulds in a short time. Other published papers have focused on similar mixtures [15][16][17][18] have also shown great potential future applications for gating systems and for no-bake moulds in the foundry industry.…”