Holding time in the pressing cycle and its influence on the performance characteristics of zinc oxide varistor discs

The pressing cycle usually adopted for compacting zinc oxide varistor discs is similar to that followed in the case of conventional ceramic processing. The approach consists of applying force through punches on the powder within the die,employing a number of holding or dwell times in the different p...

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Main Authors:	Karim, A.N. Mustafizul, Puyane, R., El-Baradie, M.A, Hashmi, M. S. J.
Format:	Article
Language:	English
Published:	Elsevier 1998
Subjects:	T58.7 Production capacity. Manufacturing capacity
Online Access:	http://irep.iium.edu.my/26848/ http://irep.iium.edu.my/26848/ http://irep.iium.edu.my/26848/1/Holding_Time_Var-_main_%234.pdf

id	iium-26848
recordtype	eprints
spelling	iium-268482013-07-24T02:20:14Z http://irep.iium.edu.my/26848/ Holding time in the pressing cycle and its influence on the performance characteristics of zinc oxide varistor discs Karim, A.N. Mustafizul Puyane, R. El-Baradie, M.A Hashmi, M. S. J. T58.7 Production capacity. Manufacturing capacity The pressing cycle usually adopted for compacting zinc oxide varistor discs is similar to that followed in the case of conventional ceramic processing. The approach consists of applying force through punches on the powder within the die,employing a number of holding or dwell times in the different phases of loading. Depending on the frictional surface area and the volume of the disc, the total duration of the holding time can be about 20–30% of the pressing cycle. Although there are some specific purposes of these dwell times in obtaining the desired quality of the green body, the resultant effect on the sintered physical and electrical property of the varistor is not reported. The present study was conducted to investigate the impact of the holding time on the performance characteristics. Three input variables, pre-press, press dwell and ejection delay time, were varied at two levels to undertake a factorial design for evaluating the main and interactive effects of these parameters. It has been observed that these dwell times have considerable influences on the physical as well as on the electrical properties of the varistor discs. Thus there is scope for optimizing the level of these pressing parameters to secure enhanced varistor performance. Elsevier 1998 Article PeerReviewed application/pdf en http://irep.iium.edu.my/26848/1/Holding_Time_Var-_main_%234.pdf Karim, A.N. Mustafizul and Puyane, R. and El-Baradie, M.A and Hashmi, M. S. J. (1998) Holding time in the pressing cycle and its influence on the performance characteristics of zinc oxide varistor discs. Journal of Materials Processing Technology, 77. pp. 54-58. ISSN 0924-0136 http://journals.elsevier.com/journal-of-materials-processing-technology
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	T58.7 Production capacity. Manufacturing capacity
spellingShingle	T58.7 Production capacity. Manufacturing capacity Karim, A.N. Mustafizul Puyane, R. El-Baradie, M.A Hashmi, M. S. J. Holding time in the pressing cycle and its influence on the performance characteristics of zinc oxide varistor discs
description	The pressing cycle usually adopted for compacting zinc oxide varistor discs is similar to that followed in the case of conventional ceramic processing. The approach consists of applying force through punches on the powder within the die,employing a number of holding or dwell times in the different phases of loading. Depending on the frictional surface area and the volume of the disc, the total duration of the holding time can be about 20–30% of the pressing cycle. Although there are some specific purposes of these dwell times in obtaining the desired quality of the green body, the resultant effect on the sintered physical and electrical property of the varistor is not reported. The present study was conducted to investigate the impact of the holding time on the performance characteristics. Three input variables, pre-press, press dwell and ejection delay time, were varied at two levels to undertake a factorial design for evaluating the main and interactive effects of these parameters. It has been observed that these dwell times have considerable influences on the physical as well as on the electrical properties of the varistor discs. Thus there is scope for optimizing the level of these pressing parameters to secure enhanced varistor performance.
format	Article
author	Karim, A.N. Mustafizul Puyane, R. El-Baradie, M.A Hashmi, M. S. J.
author_facet	Karim, A.N. Mustafizul Puyane, R. El-Baradie, M.A Hashmi, M. S. J.
author_sort	Karim, A.N. Mustafizul
title	Holding time in the pressing cycle and its influence on the performance characteristics of zinc oxide varistor discs
title_short	Holding time in the pressing cycle and its influence on the performance characteristics of zinc oxide varistor discs
title_full	Holding time in the pressing cycle and its influence on the performance characteristics of zinc oxide varistor discs
title_fullStr	Holding time in the pressing cycle and its influence on the performance characteristics of zinc oxide varistor discs
title_full_unstemmed	Holding time in the pressing cycle and its influence on the performance characteristics of zinc oxide varistor discs
title_sort	holding time in the pressing cycle and its influence on the performance characteristics of zinc oxide varistor discs
publisher	Elsevier
publishDate	1998
url	http://irep.iium.edu.my/26848/ http://irep.iium.edu.my/26848/ http://irep.iium.edu.my/26848/1/Holding_Time_Var-_main_%234.pdf
first_indexed	2023-09-18T20:39:55Z
last_indexed	2023-09-18T20:39:55Z
_version_	1777409296515989504

Holding time in the pressing cycle and its influence on the performance characteristics of zinc oxide varistor discs

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