Microwave dewaxing applied to the investment casting process |
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| Authors: | Fábio J.B. Brum Sandro C. Amico Ivo Vedana Jaime A. Spim |
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| Affiliation: | 1. LAPOL/PPGEM/UFRGS, P.O. Box 15010, Porto Alegre, RS 91.501-970, Brazil;2. FAQ/PUCRS, Av. Ipiranga, 6681 Predio 12-A, Porto Alegre, RS 90.619-900, Brazil;3. LAFUN/PPGEM/UFRGS, P.O. Box 15021, Porto Alegre, RS 91.501-970, Brazil;1. Unité de Recherche de Chimie Appliqué et Environnement, Département de Chimie, Faculté des Sciences Monastir, Monastir 5019, Tunisia;2. University Grenoble Alpes, LGP2, F-38000 Grenoble, France;3. CNRS, LGP2, F-38000 Grenoble, France;4. Cellulose and Paper Department & Advanced Materials and Nanotechnology Group, Centre of Excellence for Advanced Sciences, National Research Centre, Dokki, Giza, Egypt;1. School of Aerospace Engineering, Xiamen University, 422 South Siming Road, Xiamen 361005, PR China;2. Shenzhen Research Institute, Xiamen University, No. 19, Gaoxin South 4th Road, Nanshan District, Shenzhen 518057, PR China;3. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, 77 Massachusetts Avenue, Cambridge, MA 02139, USA;1. Research Unity of Applied Chemistry & Environment, Department of Chemistry, Faculty of Sciences, University of Monastir, 5019 Tunisia;2. University Grenoble Alpes, LGP2, F-38000 Grenoble, France;3. CNRS, LGP2, F-38000 Grenoble, France;4. CERMAV, UPR CNRS 5301, ICMG FR 2607, BP 53, Grenoble Cedex 9, France;5. University of Sfax-Faculty of Science – LMSE, Tunisia |
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| Abstract: | Autoclave processing is commonly used nowadays for dewaxing in the investment casting process. However, since the use of microwave is steadily growing in industrial processes and the wax interacts with the electromagnetic energy of the microwaves, the present work studies the possibility of carrying out dewaxing via microwave. The wax (mineral wax, vegetable resin, low molecular-weight polymer and anti-oxidant) used in this work was prepared by melting in an oven equipped with a mineral oil bath. The chemical and structural stability of the wax were monitored throughout 12 simulated dewaxing cycles, via various analyses, namely, volumetric expansion, hardness, Fourier transform infrared spectroscopy, ultraviolet–visible spectrophotometry, differential scanning calorimetry and viscosity. The results showed that microwave dewaxing is viable, significantly decreasing the incorporation of dirt and water, which is inevitable in the autoclave dewaxing process. |
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