Investigation of an Advanced Cellulose Profile Used for the Manufacture of Gating Systems

Abstract

The herein paper contains the results of investigations on a new type of cellulose blend used for the manufacture of profiles applied in the process of making gating systems in the foundry industry. A standard cellulose profile was subjected to an experiment. During the experiment the profile was filled with a liquid cast iron and at the same time the temperatures of the liquid metal crystallizing inside the profile were measured as well as the temperature of the outer layer of the profile was controlled. Further, the microstructure of the cast iron, which crystallized out inside the cellulose profile, was analysed and the cellulose, thermally degraded after the experiment, was verified with the use of the chemical analysis method. Moreover, a quality analysis of the original as well as the degraded cellulose profile was run with the use of the FTIR infrared spectroscopy. The presented results revealed that the cellulose blend is aluminium silicate enriched and contains organic binder additives. The cast iron, which crystallized out, tended to have an equilibrium pearlitic structure with the release of graphite and carbides. The generation of disequilibrium ausferrite phases was also observed in the structure.

Expanded Perlite, Expanded Vermiculite and Microspheres as Fillers in New Generation Paper Pulp Mixtures Used for Contact With Liquid Metal

“…The current knowledge of the expanded vermiculite [17][18][19][20][21], expanded perlite [22,23], and microspheres [24,25] proves their higher thermal resistance when compared to the cellulose based unmodified materials [11,12]. The exothermic effect for the commercial cellulose sample and the experimental #1 one is connected with the occurrence of microspheres which, to a certain temperature level, behave as an admixture improving the insulation ability of the mixture, whereas after exceeding the limit temperature they trigger exothermal effects [12,15,16].…”

“…The use of the aluminosilicate binders did not cause any considerable deviations at the course of the temperature change during measurements. It allows for the use of this resin for the applications of this type which is insofar essential that it is a more friendly material for human health and life than the materials used for the cellulose commercial shapes [12,15,16,26].…”

Gas Evolution Quantitative Analysis at a Temperature of 900°C of a Cellulose Mixture Modified by Mineral Additives

“…It is a cellulose-based material [9] which solves the problem of mechanical processing while at the same time retaining similar thermal insulation capabilities. Unfortunately, it contains some organic binders, which are a source of intensive gas evolution during high-temperature thermal treatment [2,10].…”

“…They are also often harmful to the health and life of humans [3]. Therefore, the tendency to reduce the gas evolutions during the casting process is an obvious goal and the result of which is the seeking out of novel moulding compounds [14]. Different ceramic materials, which may have some disadvantages, but which contaminate the moulding compounds and prove difficult in mechanical treatment, are usually used to make casting systems for large and medium-sized casts.…”

“…Different ceramic materials, which may have some disadvantages, but which contaminate the moulding compounds and prove difficult in mechanical treatment, are usually used to make casting systems for large and medium-sized casts. This paper presents a gas evolution study of a cellulosebased mixture obtained from waste paper with the addition of minerals resistant to high-temperature, such as expanded perlite, expanded vermiculite and microspheres [14][15][16][17][18][19]. Being materials of high thermal resistance, the additives modify the thermal resistance parameters of the cellulose-based mixture.…”