Inorganic Binders for mould and core production in the foundry by Hartmut Polzin

Author:Hartmut Polzin
Language: eng
Format: epub
Tags: mould;core;production;clay minerals;inorganic;organic;binder;system;foundry;Chemic;industry;casting;cement;application
ISBN: 9783794908943
Publisher: Fachverlag Schiele & Schön GmbH, Berlin
Published: 2014-11-15T00:00:00+00:00

% binder content multiplied by average grain size = 1.

This means that the amount of binder required is inversely proportional to the average grain size. The required amount of hardener is specified here based on 10% of the binder quantity, the decay conveyor glycerin is added to the mould material mix at 0.06 %. The proportion of disintegrant also has an effect on the reaction rate as shown in figures 4.46 and 4.47. While figure 4.46 shows the pressure curves and shear strength for a mould mixture without glycerol, figure 4.47 displays the corresponding profiles when using higher glycerol content. In addition to the faster increase in strength it seems likely that higher final strengths can be expected. Significant successes in terms of the residual strength can be achieved by the very minimal addition of an organic decay conveyor as shown in fig 4.48. Unfortunately, it is not apparent from the cited source whether it is a mould material with glycerine in sample 1 or not. But even if the curves 1 and 2 operate with glycerine added, it must be taken into account the very low additive content. Also interesting are the conclusions of the author who reports out of his past professional practice. He notes that the water glass ester method allows a wide scope for the application of this technology both in terms of the achievable strength and processing characteristics. Particularly important is the finding that the procedure does not cause any significant problems in terms of the decay behaviour in the production of castings made from cast iron.

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