Additive Manufacturing of Polymer by FDM Method in Investment Casting of Gas Turbine Hot Components

A.M. Kolagar¹ , M.R. Alizadeh² , Y. Miladi³

Section:Research Paper, Product Type: Journal-Paper
Vol.10 , Issue.3 , pp.7-16, Sep-2023

Online published on Sep 30, 2023

Copyright © A.M. Kolagar, M.R. Alizadeh, Y. Miladi . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Today, there is a great desire to achieve additive manufacturing technology for developing to meet specific needs in various industries. This technology has the ability to make parts that are used as an intermediate or final product. FDM technology is an additive manufacturing method that has been developed from the layer-by-layer manufacturing process of materials using computer-aided design. In this research, standard samples in the form of gas turbine nozzle airfoils were printed using three types of polymers namely ABS, PVA and PLA with different densities by FDM method. In order to make a ceramic mold, polymer models were assembled and coated in clusters. After the autoclave and sintering processes, the condition of the surface cracks, the amount of ash remaining in the molds, as well as the dimensional deviations of the cast parts from the optimum polymer model, were investigated and evaluated with a computer model. The results have shown that the lower density of the polymer model causes a greater reduction in the volume of the printed material, and as a result, by preventing the ceramic shell from more damage, it leaves less residual ash in the ceramic mold after sintering process. Also, ABS polymer has the lowest quality and PLA polymer has shown better results in different density percentages than PVA polymer and has a higher quality. As a result, it is possible to use FDM additive manufacturing technology in the production of gas turbine hot components by investment casting process using PLA polymer printed with low density percentage.

Key-Words / Index Term :
Additive manufacturing, FDM process, Investment Casting, Gas Turbine Nozzle

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