NDLI: New toughened epoxy casting systems with improved crack resistance

Content Provider	IEEE Xplore Digital Library
Author	Peyer, R. Hubler, E. Rajadhyaksha, M.
Copyright Year	1995
Description	Author affiliation: Ciba Polymers, Basle, Switzerland (Peyer, R.; Hubler, E.; Rajadhyaksha, M.)
Abstract	Many high voltage components are subjected to relatively high thermal cycles. In castings, there is often a combination of metal inserts combined with insulating materials. The resulting difference of thermal expansion coefficients will lead to variable mechanical and electrical intrinsic stresses in the cast components. This calls for insulating materials which are able to resist crack propagation under all kinds of fast changing operational temperatures. Newly developed toughened epoxy casting systems for indoor and outdoor applications, and their advantages over the state of the art mineral filled systems, are presented in this paper. It is shown that these new innovative materials can successfully withstand temperature cycles between 150/spl deg/C down to -50/spl deg/C without being damaged, whereas traditional epoxy systems may already show cracking failures at 0/spl deg/C. These new materials are easily processable on conventional casting equipment. They exhibit slightly higher viscosity, but this can easily be controlled by using the rapid APG technique. Therefore it can be stated that these toughened materials may be used in all existing application fields whenever high crack resistance must be achieved under harsh operational conditions.
Starting Page	317
Ending Page	324
File Size	689343
Page Count	8
File Format	PDF
ISBN	0941783154
DOI	10.1109/EEIC.1995.482383
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-09-18
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Casting Insulation Thermal stresses Temperature Electric resistance Voltage Inorganic materials Thermal expansion Resists Minerals
Content Type	Text
Resource Type	Article

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