Research And Development Of Tungsten Wire For High Energy Halogen Lamp

High energy-efficient halogen lamp is a new type of energy-efficient halogen lamp,requiring high luminous efficiency and long life.As the core material of halogen lamp,the performance requirements of tungsten wire materials used in high energy-efficient halogen lamps are getting higher and higher since of the implementation of halogen energy efficiency instructions.This paper systematically studied the failure mechanism of high energy-efficient halogen lamp and the performance requirements of tungsten wire materials.In this study,a new grade of tungsten wire which can meet the luminous efficiency requirement and the life expectancy of high energy-efficient lamp were developed.This new grade of tungsten wire features in good diameter consistency,high surface finish,excellent high temperature performance and long interlocking recrystallization structure.The main results are as follows:(1)By increasing the content of doped K appropriately,adjusting the proportion of B\D powder and optimizing the drawing process,the high temperature anti-sag property of the tungsten wire was improved significantly(2)Developed a new wire redrawing process.Here,the split rate of wire was reduced and its high temperature performance was improved,using lower heating temperature,while increasing die temperature to improve the deformation temperature.(3)According to the results of experiment,the intermediate stress relief annealing temperature of doped tungsten wire is slightly lower than that of the first recrystallization and about 20-25%decrease of the tensile strength after annealing is the optimal experimental parameters and which can lead to the best results.(4)The fluctuation of processing temperature and the density change of graphite lubricant are the key factors which affected the consistency of tungsten wire diameter.