THE USE OF CERAMIC FILTERS IN THE SMELTING OF WORKPIECES FROM HEAT-RESISTANT ALLOYS

Abstract

To improve the operational characteristics of gas turbine engine blades, it is necessary to use new methods of cleaning and refining metal. Melt filtration is an effective way to improve casting quality.According to the conducted analyses, it was determined that the amount of conditioned waste generated during the smelting of products reaches 27% of the mass of the spent charge, and non-conditioned waste rejected during LUMMA control is 23%. The results of the statistical analysis show that the total amount of waste generated during the smelting of gas turbine blades is, on average, 60–70% of the weight of the loaded charge.The purpose of the work is to create a new composition of the ceramic mixture for the production of high-strength filters, as well as the development of technology for the production of gas turbine parts using them.The analysis was performed on samples of heat-resistant corrosion-resistant alloy CM88Y. The alloy for research was melted from the primary charge on the UPPF-3M foundry unit. As a result of the work carried out, a new rational composition of the mixture for the manufacture of ceramics was created, which allows to increase the characteristics of strength and heat resistance. An instruction was created for the manufacture of ceramic filters at machine-building enterprises. To eliminate damage to ceramic rods in blades under the influence of thermal shock, improved systems for filtering metal in a liquid state and filling ceramic molds are proposed. Uniform temperature distribution across the cross-section of the casting also reduces the number of defective products.