Rheological and mechanical properties of Yttria Stabilized Zirconia (YSZ) produced by ceramic injection moulding / Mahfuzah Zainudin

Powder Injection Moulding (PIM) is a promising approach to producing a near netshape product of intricate geometry with cost-effective production. PIM by using ceramic powders has been studied recently due to interest as ceramic biomaterials. Yttria Stabilized Zirconia (YSZ) powders are renowned mat...

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Main Author:	Zainudin, Mahfuzah
Format:	Thesis
Language:	English
Published:	2017
Subjects:	Mechanics applied to machinery Dynamics
Online Access:	https://ir.uitm.edu.my/id/eprint/18843/1/18843.PDF
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id	my-uitm-ir.18843
record_format	uketd_dc
spelling	my-uitm-ir.188432024-08-02T02:53:12Z Rheological and mechanical properties of Yttria Stabilized Zirconia (YSZ) produced by ceramic injection moulding / Mahfuzah Zainudin 2017 Zainudin, Mahfuzah Mechanics applied to machinery. Dynamics Powder Injection Moulding (PIM) is a promising approach to producing a near netshape product of intricate geometry with cost-effective production. PIM by using ceramic powders has been studied recently due to interest as ceramic biomaterials. Yttria Stabilized Zirconia (YSZ) powders are renowned materials with their, biocompatibility, superior dimensional stability and excellent mechanical properties resulting from mechanisms of transformation toughening. The focus of this study is to fabricate root pins for dental implantation structure through Ceramic Injection Moulding (CIM). 3 mol% YSZ powders were used to mix with binder components that consist of palm stearin (PS) as a primary binder and polyethylene (PE) as a backbone binder in 60:40 ratios. Four different powder loadings were prepared in this study; 57, 58, 59 and 60 vol. % based on critical powder volume percentage (CPVP) experiment. The homogeneity of the feedstocks was evaluated via torque rheometry data and scanning electron microscopy (SEM) observation. The flow ability of the feedstock were determined through rheological characteristic which are the relationship of viscosity and shear rate formed pseudoplastic behaviour, the flow behaviour index value (n) is below than 1 and lower activation energy (E). Then, all feedstocks were injected in a screw thread shape and rectangular bar mould for further experiment. All moulded specimens were embedded into alumina powder (wicking agent) before undergoing thermal debinding process at 550°C to remove the binders and pre-sintering at 1100°C was carried out simultaneously after debinding process in the same furnace. The parts were subsequently sintered in the furnace up to 1450°C for 3 hours without wicking agent with 3°C/min heating rate. The characterization of sintered parts, physical properties, and mechanical properties was performed. It is expected that, low powder loading specimens (57 vol. %) had lower viscosity, strength, density and hardness but higher in porosity compared to higher powder loading specimens (58 vol. %, 59 vol. % and 60 vol. %). The elastic modulus of compressive strength and hardness for 60 vol. % specimens was 4.79 ± 1.24 GPa and 398.5±10.4 HV respectively. Overall, root pins for dental implantation structure was successfully fabricated via CIM technique using PS as the binder system. 2017 Thesis https://ir.uitm.edu.my/id/eprint/18843/ https://ir.uitm.edu.my/id/eprint/18843/1/18843.PDF text en public mphil masters Universiti Teknologi MARA Faculty of Mechanical Engineering
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	Mechanics applied to machinery Dynamics
spellingShingle	Mechanics applied to machinery Dynamics Zainudin, Mahfuzah Rheological and mechanical properties of Yttria Stabilized Zirconia (YSZ) produced by ceramic injection moulding / Mahfuzah Zainudin
description	Powder Injection Moulding (PIM) is a promising approach to producing a near netshape product of intricate geometry with cost-effective production. PIM by using ceramic powders has been studied recently due to interest as ceramic biomaterials. Yttria Stabilized Zirconia (YSZ) powders are renowned materials with their, biocompatibility, superior dimensional stability and excellent mechanical properties resulting from mechanisms of transformation toughening. The focus of this study is to fabricate root pins for dental implantation structure through Ceramic Injection Moulding (CIM). 3 mol% YSZ powders were used to mix with binder components that consist of palm stearin (PS) as a primary binder and polyethylene (PE) as a backbone binder in 60:40 ratios. Four different powder loadings were prepared in this study; 57, 58, 59 and 60 vol. % based on critical powder volume percentage (CPVP) experiment. The homogeneity of the feedstocks was evaluated via torque rheometry data and scanning electron microscopy (SEM) observation. The flow ability of the feedstock were determined through rheological characteristic which are the relationship of viscosity and shear rate formed pseudoplastic behaviour, the flow behaviour index value (n) is below than 1 and lower activation energy (E). Then, all feedstocks were injected in a screw thread shape and rectangular bar mould for further experiment. All moulded specimens were embedded into alumina powder (wicking agent) before undergoing thermal debinding process at 550°C to remove the binders and pre-sintering at 1100°C was carried out simultaneously after debinding process in the same furnace. The parts were subsequently sintered in the furnace up to 1450°C for 3 hours without wicking agent with 3°C/min heating rate. The characterization of sintered parts, physical properties, and mechanical properties was performed. It is expected that, low powder loading specimens (57 vol. %) had lower viscosity, strength, density and hardness but higher in porosity compared to higher powder loading specimens (58 vol. %, 59 vol. % and 60 vol. %). The elastic modulus of compressive strength and hardness for 60 vol. % specimens was 4.79 ± 1.24 GPa and 398.5±10.4 HV respectively. Overall, root pins for dental implantation structure was successfully fabricated via CIM technique using PS as the binder system.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Zainudin, Mahfuzah
author_facet	Zainudin, Mahfuzah
author_sort	Zainudin, Mahfuzah
title	Rheological and mechanical properties of Yttria Stabilized Zirconia (YSZ) produced by ceramic injection moulding / Mahfuzah Zainudin
title_short	Rheological and mechanical properties of Yttria Stabilized Zirconia (YSZ) produced by ceramic injection moulding / Mahfuzah Zainudin
title_full	Rheological and mechanical properties of Yttria Stabilized Zirconia (YSZ) produced by ceramic injection moulding / Mahfuzah Zainudin
title_fullStr	Rheological and mechanical properties of Yttria Stabilized Zirconia (YSZ) produced by ceramic injection moulding / Mahfuzah Zainudin
title_full_unstemmed	Rheological and mechanical properties of Yttria Stabilized Zirconia (YSZ) produced by ceramic injection moulding / Mahfuzah Zainudin
title_sort	rheological and mechanical properties of yttria stabilized zirconia (ysz) produced by ceramic injection moulding / mahfuzah zainudin
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Mechanical Engineering
publishDate	2017
url	https://ir.uitm.edu.my/id/eprint/18843/1/18843.PDF
_version_	1811768599773184000

Rheological and mechanical properties of Yttria Stabilized Zirconia (YSZ) produced by ceramic injection moulding / Mahfuzah Zainudin

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