Functionally graded material: an overview
- Mahamood, Rasheedat M., Akinlabi, Esther Titilayo, Shukla, Mukul, Pityana, Sisa
- Authors: Mahamood, Rasheedat M. , Akinlabi, Esther Titilayo , Shukla, Mukul , Pityana, Sisa
- Date: 2012
- Subjects: Functionally graded material
- Type: Article
- Identifier: uj:5342 , ISSN 978-988-19252-2-0 , http://hdl.handle.net/10210/9887
- Description: Functionally Graded Material (FGM) belongs to a class of advanced material characterized by variation in properties as the dimension varies. The overall properties of FMG are unique and different from any of the individual material that forms it. There is a wide range of applications for FGM and it is expected to increase as the cost of material processing and fabrication processes are reduced by improving these processes. In this study, an overview of fabrication processes, area of application, some recent research studies and the need to focus more research effort on improving the most promising FGM fabrication method (solid freeform SFF) is presented. Improving the performance of SFF processes and extensive studies on material characterization on components produced will go a long way in bringing down the manufacturing cost of FGM and increase productivity in this regard.
- Full Text:
- Authors: Mahamood, Rasheedat M. , Akinlabi, Esther Titilayo , Shukla, Mukul , Pityana, Sisa
- Date: 2012
- Subjects: Functionally graded material
- Type: Article
- Identifier: uj:5342 , ISSN 978-988-19252-2-0 , http://hdl.handle.net/10210/9887
- Description: Functionally Graded Material (FGM) belongs to a class of advanced material characterized by variation in properties as the dimension varies. The overall properties of FMG are unique and different from any of the individual material that forms it. There is a wide range of applications for FGM and it is expected to increase as the cost of material processing and fabrication processes are reduced by improving these processes. In this study, an overview of fabrication processes, area of application, some recent research studies and the need to focus more research effort on improving the most promising FGM fabrication method (solid freeform SFF) is presented. Improving the performance of SFF processes and extensive studies on material characterization on components produced will go a long way in bringing down the manufacturing cost of FGM and increase productivity in this regard.
- Full Text:
Influence of structure on fatty acid ester-alkane interactions
- Scheepers, Jacques J., Muzenda, Edison, Belaid, Mohamed
- Authors: Scheepers, Jacques J. , Muzenda, Edison , Belaid, Mohamed
- Date: 2012
- Subjects: Absorption , Activity coefficients , Biodiesel , Esters , Volatile organic compounds
- Type: Article
- Identifier: uj:4671 , ISSN 978-988-19252-2-0 , http://hdl.handle.net/10210/10436
- Description: The activity coefficients of alkane structures in various types of fatty acid ester solvents was measured in order to determine the effect of bond interactions between these two chemical species. It is important to understand the mechanics of these interactions for absorber system design. Activity coefficients were determined by use of a Microsoft Excel spreadsheet designed for this purpose. It was determined that the length of the ester chain, as well as ester chain saturation had an impact on activity coefficients, in that saturated ester chains and longer ester chains yielded lower activity coefficients. Multiple branched cycloalkanes yielded lower activity coefficients than straight chain hydrocarbons and unbranched cycloalkanes. It was also noted that the location of the carboxyl group in the ester chain had no influence on activity coefficients.
- Full Text:
- Authors: Scheepers, Jacques J. , Muzenda, Edison , Belaid, Mohamed
- Date: 2012
- Subjects: Absorption , Activity coefficients , Biodiesel , Esters , Volatile organic compounds
- Type: Article
- Identifier: uj:4671 , ISSN 978-988-19252-2-0 , http://hdl.handle.net/10210/10436
- Description: The activity coefficients of alkane structures in various types of fatty acid ester solvents was measured in order to determine the effect of bond interactions between these two chemical species. It is important to understand the mechanics of these interactions for absorber system design. Activity coefficients were determined by use of a Microsoft Excel spreadsheet designed for this purpose. It was determined that the length of the ester chain, as well as ester chain saturation had an impact on activity coefficients, in that saturated ester chains and longer ester chains yielded lower activity coefficients. Multiple branched cycloalkanes yielded lower activity coefficients than straight chain hydrocarbons and unbranched cycloalkanes. It was also noted that the location of the carboxyl group in the ester chain had no influence on activity coefficients.
- Full Text:
Recovery of aluminium oxide from flint clay through H2SO4 leaching
- Muzenda, Edison, Daniels, Angus L., Belaid, Mohamed, Ntuli, Freeman
- Authors: Muzenda, Edison , Daniels, Angus L. , Belaid, Mohamed , Ntuli, Freeman
- Date: 2012
- Subjects: Flint clay , Aluminium oxide , Leaching
- Type: Article
- Identifier: uj:4690 , ISSN 978-988-19252-2-0 , http://hdl.handle.net/10210/10480
- Description: Please refer to full text to view abstract
- Full Text:
- Authors: Muzenda, Edison , Daniels, Angus L. , Belaid, Mohamed , Ntuli, Freeman
- Date: 2012
- Subjects: Flint clay , Aluminium oxide , Leaching
- Type: Article
- Identifier: uj:4690 , ISSN 978-988-19252-2-0 , http://hdl.handle.net/10210/10480
- Description: Please refer to full text to view abstract
- Full Text:
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