Title

DETERMINATION OF THE BEHAVIOUR OF CERAMIC MOLDS FOR PRECISION CASTING OF COPPER-TITANIUM-CHROMIUM ALLOYS

Authorship

VERGARA, V.E.; NEIRA, E.A.

VERGARA, V.E.

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NEIRA, E.A.

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DOI

10.5151/2594-5327-49v5-73-84

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Abstract

The behaviour of several molds obtained by two methods of mold construction when put in contact with copper-titanium-chromium liquid alloys in the range of 1200–1400 °C was studied. Investment and Shaw processes were used, and molds were made with different proportions of zircon, bauxite, and silica in the range 270–325 mesh, using ethyl silicate as binder. The metal-mold reaction was determined by electron microprobe to scan the concentration of the alloying elements on the contact surface of the molds after the shake-out. The castability of the alloy and the physical behaviour of the molds were determined by measuring the rugosity of the contact surface of the pieces and the dimensional difference between them and the corresponding patterns. In both processes, the metal-mold reactivity is negligible, finding only traces of the alloy components on the contact surfaces. The relative proportion of each of the mold components has a low incidence on the reactivity and rugosity, but a high incidence on the dimensional variability of the casted pieces. It is concluded that this kind of mold has a good behaviour when used to cast such type of alloys, allowing the production of pieces with complex shapes.

Keywords

ceramic molds, copper alloys, investment casting, mold reactivity, dimensional accuracy