Magnet wire for 600 C temperature transformers

As a part of work performed on a government contract, magnet-wire materials were investigated for application in electronic power transformers and inductors. One of the most critical environments specified for the application was 1,000-hour life in the ambient temperature range - 65 C (degrees centigrade) to 500 C. This paper summarizes the planning and results of an ultrahigh-temperature heat-aging program designed to screen selectively the most promising magnet wires to meet this requirement.