Method of making molds for the casting of metals
AssigneeDynamit Nobel Aktiengesellschaft
InventorsWerner Dittrich, Friedhelm Schnippering
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Abstract
An improvement in a process for making a mold for metal casting by applying a fluid ceramic composition containing binding agent and finely divided refractory substance to a pattern and hardening the same, which improvement comprises employing a ceramic composition which contains special solvents, anti-setting and thixotropic agents, so that this composition after applying gives a uniform coat which does not run down from walls.
Claims19
In a process for making a multilayer mold comprising applying to a foundry mold form a first ceramic composition containing a refractory aggregate and a binder selected from the group consisting of an alcoholate of titanium, aluminum or zirconium and an alkyl silicate, hardening said first ceramic composition on said mold form to form a first layer and adding onto said first layer before said first layer has fully hardened a second ceramic composition in the form of a supportive backfill and hardening said second ceramic composition, the improvement comprising as said first ceramic composition,
- A. a first refractory material of grain size 100 to 200 (Tyler) mesh and a second refractory material of 14 to 32 (Tyler) mesh, the volumetric ratio of said first refractory material being 1-2 :
- 1 and;
- B. an anti-settling agent in an amount between 0.1 and 10 weight percent, said anti-settling agent selected from the group consisting of montmorillonite, bentonite, pyrogenic silica, asbestos flour, asbestos filaments, ethylcellulose, talc and mica.
Dependencies are inferred from the claim text.