INTERACTION BETWEEN THE METAL AND THE MOLD DURING THE CASTING OF TITANIUM,
Abstract
The reactions between Ti and various refractory oxides and materials, used in connection with casting of Ti, were studied. The following mould materials were tested: BeO, ZrO2; TiO2, SiO2, Al2O3 as well as titanium carbide, graphite ground to various degrees of fineness and colloidal graphite. Water glass, ethyl silicate, special phenolformaldehyde resin-base glue, aqueous solutions of colloidal graphite, zirconium nitrate, etc., were used as binding materials. Refractory paints were applied to model mixture moulds consisting of 50% stearin and 50% paraffin. The melting point of the model mixture was 50-55 degrees. In order to assess the reaction between molten Ti and the mould materials, special moulds (in the shape of small crucibles) made from different materials were placed inside a graphite ingot mould in such a way that four moulds could be teemed under identical conditions. Sticking of the mould mixture was investigated in relation to the composition of the latter and the temperature of the metal teemed, temperatures of 1790, 1800, 1850 and 1950 degrees being used. It was found that the maximum hardness and depth of hard zone rise considerably with an increase in the pouring temperature. The authors endeavoured to develop a material more inert with respect to molten Ti, based on zirconium dioxide, by adding metallic Ti powder to the latter, thus ensuring a shortage of oxygen in ZrO2. ZrO2 + 15 atomic % Ti with zirconium nitrate binder was found to be the most satisfactory material investigated, the optimum teeming temperature for Ti being 1760 degrees. Good results were also obtained by using shell moulds made of ZrO2 and Al2O3 on ethyl silicate.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 29, 1968
- Accession Number
- AD0675245
Entities
People
- M. S. Maurakh
- V. S. Pugin
Organizations
- National Air and Space Intelligence Center