Reinforcement of rice husk in ceramic shell mould system for investment casting process

Generally, production of metal component via investment casting process need a development of a very thin ceramic shell mould that can withstand a higher molten metal temperature. Development of ceramic shell mould is very crucial as its involves several times of dipping process followed by the d...

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Main Author:	Kamarudin, Noor Hasliza
Format:	Thesis
Language:	English English English
Published:	2012
Subjects:	TA Engineering (General) Civil engineering (General) TA630-695 Structural engineering (General)
Online Access:	http://eprints.uthm.edu.my/2002/1/24p%20NOOR%20HASLIZA%20KAMARUDIN.pdf http://eprints.uthm.edu.my/2002/2/NOOR%20HASLIZA%20KAMARUDIN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/2002/3/NOOR%20HASLIZA%20KAMARUDIN%20WATERMARK.pdf
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id	my-uthm-ep.2002
record_format	uketd_dc
spelling	my-uthm-ep.20022021-10-14T05:54:37Z Reinforcement of rice husk in ceramic shell mould system for investment casting process 2012-10 Kamarudin, Noor Hasliza TA Engineering (General). Civil engineering (General) TA630-695 Structural engineering (General) Generally, production of metal component via investment casting process need a development of a very thin ceramic shell mould that can withstand a higher molten metal temperature. Development of ceramic shell mould is very crucial as its involves several times of dipping process followed by the drying and firing stages. Typically, this ceramic shell mould is very brittle and easily prone to cracks that will lead to the casting defects and handling problem at early stage. Therefore, this work focuses on the development of brittle ceramic shell mould via reinforcement method. Rice husk fibers and rice husk ash were selected as a reinforcement material due to the facts that its contains higher percentage of silica. The samples were prepared by three compositions which are untreated rice husk fiber, rice husk treated fiber by sodium hydroxide and rice husk ash. The mechanical and physical properties of ceramic shell mould layering system were measured via Modulus of Rupture, density and porosity, permeability, shrinkage, thermal expansion and observation of metal casting. Experimental results show that the reinforced ceramic shell mould with treated rice husk fiber achieved highest green strength (1.34 MPa). However, ceramic shell mould with rice husk ash shows the highest fired strength (4.87 MPa). Indeed, rice husk fibers additions have greatly increased porosity after firing at 1000 ºC by values of 20.06 % and hence promotes increments of permeability by value of 2.46 x 10 -11 2 cm . The present of silica also gives highest density, lowest shrinkage and thermal expansion by value of 1.9516 g/cm 3 , 0.1258 mm and 0.088 % respectively for ceramic shell with rice husk ash. Observation of metal casting shows that reinforced ceramic shell can withstand high molten metal temperature without cracking. Hence, reinforced ceramic shell has reduced production time and cost via avoiding failure to the mould and end cast product. 2012-10 Thesis http://eprints.uthm.edu.my/2002/ http://eprints.uthm.edu.my/2002/1/24p%20NOOR%20HASLIZA%20KAMARUDIN.pdf text en public http://eprints.uthm.edu.my/2002/2/NOOR%20HASLIZA%20KAMARUDIN%20COPYRIGHT%20DECLARATION.pdf text en validuser http://eprints.uthm.edu.my/2002/3/NOOR%20HASLIZA%20KAMARUDIN%20WATERMARK.pdf text en validuser mphil masters Universiti Tun Hussein Malaysia Fakulti Kejuruteraan Mekanikal dan Pembuatan
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	TA Engineering (General) Civil engineering (General) TA630-695 Structural engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) TA630-695 Structural engineering (General) Kamarudin, Noor Hasliza Reinforcement of rice husk in ceramic shell mould system for investment casting process
description	Generally, production of metal component via investment casting process need a development of a very thin ceramic shell mould that can withstand a higher molten metal temperature. Development of ceramic shell mould is very crucial as its involves several times of dipping process followed by the drying and firing stages. Typically, this ceramic shell mould is very brittle and easily prone to cracks that will lead to the casting defects and handling problem at early stage. Therefore, this work focuses on the development of brittle ceramic shell mould via reinforcement method. Rice husk fibers and rice husk ash were selected as a reinforcement material due to the facts that its contains higher percentage of silica. The samples were prepared by three compositions which are untreated rice husk fiber, rice husk treated fiber by sodium hydroxide and rice husk ash. The mechanical and physical properties of ceramic shell mould layering system were measured via Modulus of Rupture, density and porosity, permeability, shrinkage, thermal expansion and observation of metal casting. Experimental results show that the reinforced ceramic shell mould with treated rice husk fiber achieved highest green strength (1.34 MPa). However, ceramic shell mould with rice husk ash shows the highest fired strength (4.87 MPa). Indeed, rice husk fibers additions have greatly increased porosity after firing at 1000 ºC by values of 20.06 % and hence promotes increments of permeability by value of 2.46 x 10 -11 2 cm . The present of silica also gives highest density, lowest shrinkage and thermal expansion by value of 1.9516 g/cm 3 , 0.1258 mm and 0.088 % respectively for ceramic shell with rice husk ash. Observation of metal casting shows that reinforced ceramic shell can withstand high molten metal temperature without cracking. Hence, reinforced ceramic shell has reduced production time and cost via avoiding failure to the mould and end cast product.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Kamarudin, Noor Hasliza
author_facet	Kamarudin, Noor Hasliza
author_sort	Kamarudin, Noor Hasliza
title	Reinforcement of rice husk in ceramic shell mould system for investment casting process
title_short	Reinforcement of rice husk in ceramic shell mould system for investment casting process
title_full	Reinforcement of rice husk in ceramic shell mould system for investment casting process
title_fullStr	Reinforcement of rice husk in ceramic shell mould system for investment casting process
title_full_unstemmed	Reinforcement of rice husk in ceramic shell mould system for investment casting process
title_sort	reinforcement of rice husk in ceramic shell mould system for investment casting process
granting_institution	Universiti Tun Hussein Malaysia
granting_department	Fakulti Kejuruteraan Mekanikal dan Pembuatan
publishDate	2012
url	http://eprints.uthm.edu.my/2002/1/24p%20NOOR%20HASLIZA%20KAMARUDIN.pdf http://eprints.uthm.edu.my/2002/2/NOOR%20HASLIZA%20KAMARUDIN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/2002/3/NOOR%20HASLIZA%20KAMARUDIN%20WATERMARK.pdf
_version_	1747830897080532992

Reinforcement of rice husk in ceramic shell mould system for investment casting process

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