Influence of sawdust on the properties of the ceramic shell used in investment casting process
- 116 Downloads
The quality of the investment casting (IC) ceramic shell was enhanced using sawdust as an inexpensive and naturally available additive in the ceramic slurries. The important shell properties such as thickness, porosity, permeability and flexural strength were determined. The ceramic shell accommodated a substantial amount of sawdust because of its low particle density and porous structure which resulted in higher green strength and thickness of the shell. The same shell upon firing led to increased shell porosity and permeability with good knockability characteristic. The addition of sawdust in the secondary layers did not affect the composition of the primary layer of the ceramic shell. The mechanical properties of the aluminium-silicon (Al-Si) alloy castings obtained from the sawdust-modified shells were found to be comparatively higher than those obtained from the conventional shells.
KeywordsCeramic Shell Casting Strength Porosity Permeability
Unable to display preview. Download preview PDF.
- 1.Beeley PR, Smart RF (1995) Investment casting, first edn. The Institute of Materials, LondonGoogle Scholar
- 3.Kalpakjian S, Schmid S (2008). Manufacturing processes for engineering materials, fifth ed. Pearson Education IncorporationGoogle Scholar
- 5.Pattnaik SR, Karunakar DB, Jha PK (2013) Parametric optimization of the investment casting process using utility concept and Taguchi method. P I Mech Eng L- J Mater Design Appl DOI. doi: 10.1177/1464420713487654
- 6.Pattnaik SR, Karunakar DB, Jha PK (2013) Modeling and parametric optimization of investment casting process by uniting desirability function approach and fuzzy logic. Journal of Intelligent and Fuzzy Systems - IOS Press. doi: 10.3233/IFS-130809
- 9.Wang D, He B, Liu S, Liu C, Fei L (2015) Dimensional shrinkage prediction based on displacement field in investment casting. Int J Adv Manuf Technol. doi: 10.1007/s00170-015-7836-1
- 10.Guerra M, Schiefelbein GW (1994) Review of shell components, shell characteristics and properties: refractory selection for primary shell coat. In: Proceedings of the Investment Casting Institute 42nd Annual Meeting, Atlanta, pp. 25–28Google Scholar
- 11.Ertuan Z, Fantao K, Yanfei C, Ruirun C, Yuyong C (2012) Characterization of zirconia-based slurries with different binders for titanium investment casting. Research & Development 9(2):125–130Google Scholar
- 14.Moore JR, Maybaum S (1986) Processes for the application of refractory compositions to surfaces such as for the preparation of refractory shell molds and refractory compositions produced thereby. US Patent No. 4624898 AGoogle Scholar
- 15.Kline DM (2010) Controlling strength and permeability of silica investment casting molds. Missouri University of Science and Technology, ThesisGoogle Scholar
- 16.Shaw RD, Duffey DJ (2004) Investment casting, US Patent No. 6769475 B2Google Scholar
- 17.Doles RS, Viers DS (2009) Filler component for investment casting slurries. US Patent No. 7588633 B2 (September 15)Google Scholar
- 25.Pattnaik SR, Karunakar DB, Jha PK (2012) Influence of injection process parameters on dimensional stability of wax patterns made by the lost wax process using Taguchi approach. P I Mech Eng L- J Mater Design Appl 227(1):52–60Google Scholar
- 27.Azzam A, Li W (2014) An experimental investigation on the three-point bending behavior of composite laminate. IOP Conf Series: Materials Science and Engineering 62 (2014) 012016 doi: 10.1088/1757-899X/62/1/012016.
- 28.Berger MB (2010). The importance and testing of density/porosity/permeability/pore size for refractories. In: Proceedings of the Southern African Institute of Mining and Metallurgy Refractories Conference, pp. 101–116Google Scholar
- 30.Francois Batllo Viers DS, Mosher JS (2009) Method of improving the removal of investment casting shells. US Patent, US7503379 B2.Google Scholar
- 31.Pattnaik SR, Jha PK, Karunakar DB (2015) A novel method of increasing ceramic shell permeability and optimizing casting shrinkage and tensile strength of the investment cast parts. P I Mech Eng B- J Engineering Manufacture DOI. doi: 10.1177/0954405415606386
- 32.Kumar S, Kumar P, Shan H.S. (2008). Effect of process parameters on impact strength of Al-7% Si alloy castings produced by VAEPC process. Int J Adv Manuf Technol 38, 586–593, DOI: 10.1007/s00170-007-1197-3.
- 33.Wilding MA (1995) Introduction: the structure of fibres. Chapter, Chemistry of the textiles industry, Page 6, DOI: 10.1007/978-94-011-0595-8_1, Springer Netherlands
- 34.Batllo Francois (2003) Method of improving the removal of investment casting shells. US Patent, WO2004062835 A2Google Scholar
- 35.Lilholt H, Lawther JM (2000). Natural organic fibers. Chapter 1.10, Comprehensive composite materials, Elsevier Publisher 1: (ISBN: 0–080437192); 303–325.Google Scholar