Preparation method of wolfram filament for halogen tungsten lamp

Abstract

The invention provides a preparation method for high yield rate, good high temperature and anti-deforming performance tungsten filament used by a tungsten lamp. The recrystallization of the invention can form good coattail joint structure, the aspect ratio is greater than 12, the high temperature intension is high in a high temperature ignition status, the high temperature anti-sag performance and anti-deforming performance is good; normal temperature intension in a normal status and ductility is good, which extends the durability of the halogen tungsten lamp; the invention levels up the high temperature anti-sag performance and enwinding performance of the tungsten used by the halogen tungsten lamp. The invention has the key technique of thinning and even dispersion of tungsten wire potassium bubble, taking A3 type ammonium paratungstate as raw material, tungsten powder preparation plan adopting tungsten powder C is different from the existing tungsten powder preparation technique, design vertical melt sintering and middle-high temperature annealing according to the height dispersion and homogenization of apotassium bubble. The invention adopts the novel production techniques such as using corundum tube oven to a first recrystallization annealing.

Description

technical field

[0001] The invention relates to tungsten powder metallurgy and metal material calendering processing technology, in particular to a preparation method of tungsten wire for halogen tungsten lamps. Background technique

[0002] With the rapid development of my country's automobile industry, electronics industry, and aerospace industry, the demand for tungsten-halogen lamps is growing at an annual rate of 20%. Halogen tungsten lamps are mainly used in the lighting systems of the above-mentioned industries, and the operating environment has the characteristics of shock and vibration. Therefore, it is required that the recrystallization structure of the core material, tungsten wire, can form a good dovetail lap structure, and the aspect ratio is greater than 12, that is, High temperature strength under high temperature ignition state, high temperature anti-sagging performance and good anti-deformation performance. my country's tungsten wire production technology ...