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Performance characteristics of zinc oxide varistor processed under different pressing conditions

Zinc oxide varistor blocks are commonly pressed by uniaxial double action compaction technique. There are a number of parameters which influence this processing operation and in this study two such compacting parameters - stress and speed were considered. Multiple discs were pressed under each condi...

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Main Authors: Karim, A.N. Mustafizul, Puyane, R., El-Baradie, M.A, Hashmi, M. S. J.
Format: Conference or Workshop Item
Language:English
Published: 1996
Subjects:
T58.7 Production capacity. Manufacturing capacity
Online Access:http://irep.iium.edu.my/26856/1/Pressing_codn_n_ZnO_%2303.pdf
http://irep.iium.edu.my/26856/
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spelling my.iium.irep.268562013-09-09T04:16:19Z http://irep.iium.edu.my/26856/ Performance characteristics of zinc oxide varistor processed under different pressing conditions Karim, A.N. Mustafizul Puyane, R. El-Baradie, M.A Hashmi, M. S. J. T58.7 Production capacity. Manufacturing capacity Zinc oxide varistor blocks are commonly pressed by uniaxial double action compaction technique. There are a number of parameters which influence this processing operation and in this study two such compacting parameters - stress and speed were considered. Multiple discs were pressed under each condition to lake into account the statistical variation of the resultant effect Increasing the stress leads to enhanced packing of material making the green body more dense while the higher speed of compaction consolidates the powder quickly and the green compact ends up with more trapped air and gas. However, the effect of these pressing variables on sintered discs is not well established specially in terms of the eventual electrical performance. This analysis reveals that out of the two variables the influence of compacting pressure is more prominent. The speed of pressing also plays a significant role. Four important operating parameters of varistor were observed. These were the nominal voltage, clamp ratio. wattloss and energy absorption capability, A model has been developed to correlate the effects. Greater compacting pressure and speed are conducive to the clamp ratio but this condition leads to the undesirable increase in wattloss. Thus the fact that a favourable pressing condition for one parameter is found to be detrimental for another necessitates to make a compromise to set the optimum pressing conditions. 1996-06 Conference or Workshop Item REM application/pdf en http://irep.iium.edu.my/26856/1/Pressing_codn_n_ZnO_%2303.pdf Karim, A.N. Mustafizul and Puyane, R. and El-Baradie, M.A and Hashmi, M. S. J. (1996) Performance characteristics of zinc oxide varistor processed under different pressing conditions. In: International Congress on Advances Advances in Powder Metallurgy and Particulate Materials, 16-21June 1996, Washington D. C..
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
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.
Performance characteristics of zinc oxide varistor processed under different pressing conditions
description Zinc oxide varistor blocks are commonly pressed by uniaxial double action compaction technique. There are a number of parameters which influence this processing operation and in this study two such compacting parameters - stress and speed were considered. Multiple discs were pressed under each condition to lake into account the statistical variation of the resultant effect Increasing the stress leads to enhanced packing of material making the green body more dense while the higher speed of compaction consolidates the powder quickly and the green compact ends up with more trapped air and gas. However, the effect of these pressing variables on sintered discs is not well established specially in terms of the eventual electrical performance. This analysis reveals that out of the two variables the influence of compacting pressure is more prominent. The speed of pressing also plays a significant role. Four important operating parameters of varistor were observed. These were the nominal voltage, clamp ratio. wattloss and energy absorption capability, A model has been developed to correlate the effects. Greater compacting pressure and speed are conducive to the clamp ratio but this condition leads to the undesirable increase in wattloss. Thus the fact that a favourable pressing condition for one parameter is found to be detrimental for another necessitates to make a compromise to set the optimum pressing conditions.
format Conference or Workshop Item
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 Performance characteristics of zinc oxide varistor processed under different pressing conditions
title_short Performance characteristics of zinc oxide varistor processed under different pressing conditions
title_full Performance characteristics of zinc oxide varistor processed under different pressing conditions
title_fullStr Performance characteristics of zinc oxide varistor processed under different pressing conditions
title_full_unstemmed Performance characteristics of zinc oxide varistor processed under different pressing conditions
title_sort performance characteristics of zinc oxide varistor processed under different pressing conditions
publishDate 1996
url http://irep.iium.edu.my/26856/1/Pressing_codn_n_ZnO_%2303.pdf
http://irep.iium.edu.my/26856/
_version_ 1643609219273850880
score 13.211869

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