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Preparation method of wolfram filament for halogen tungsten lamp

A technology of halogen tungsten lamp and tungsten wire, which is applied in the fields of tungsten powder metallurgy and metal material calendering processing, which can solve the problems of poor anti-sag performance and deformation resistance at high temperature, low recrystallization temperature at the beginning and end, and low high-temperature strength, etc., and achieve high-temperature performance Excellent winding performance, uniform cross-sectional grains, and high transition temperature

Inactive Publication Date: 2008-04-09
GANZHOU HONGFEI TUNGSTEN & MOLYBDENUM MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Screening through the ordinary tungsten wire production line: firstly, the yield rate of its products is low, resulting in high production costs; secondly, the tungsten wire for this kind of halogen lamp has low high temperature strength due to its low start and stop recrystallization temperature and small aspect ratio. Poor anti-sagging performance and anti-deformation performance at high temperature, short service life, and a large gap between quality and foreign products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1) Determine to use A3 type ammonium paratungstate as raw material;

[0046] 2) Pre-reduction;

[0047] 3) High potassium (K) doping of blue tungsten;

[0048] 4) High-purity hydrogen reduction produces A powder, B powder, and C powder. The reduction production of C powder implements six-zone temperature control, and each temperature rises zone by zone. The hydrogen flow rate is 4.0±0.5m 3 / h, pushing the boat at a constant speed, the loading capacity of the boat is 320±20g / boat;

[0049] 5) The tungsten powder is washed with hydrochloric acid and hydrofluoric acid;

[0050] 6) The effective potassium content of A powder and B powder is 82ppm and 95ppm respectively, and the effective potassium content of C powder is 129ppm, and the powder is blended in the weight ratio of 40% of C powder, 35% of A powder and 25% of B powder;

[0051] 7) The compound powder is formed by cold isostatic pressing;

[0052] 8) After pre-sintering at low temperature and high temperature s...

Embodiment 2

[0060] 1) Determine to use A3 type ammonium paratungstate as raw material;

[0061] 2) Pre-reduction;

[0062] 3) High potassium (K) doping of blue tungsten;

[0063] 4) A powder, B powder, and C powder are produced by high-purity hydrogen reduction. The process conditions are that under the condition of the same length of the reduction heating temperature zone, the temperature control of the four zones is different from the ordinary reduction, and the temperature control of the six zones is implemented, and the temperature rises zone by zone. , hydrogen flow 4.0±0.5m 3 / h, pushing the boat at a constant speed, the loading capacity of the boat is 320±20g / boat;

[0064] 5) The tungsten powder is washed with hydrochloric acid and hydrofluoric acid;

[0065] 6) After testing, when the available potassium content of powder A and powder B is 99ppm and 90ppm respectively, and the available potassium content of powder C is 138ppm, powder blending is carried out in a weight ratio o...

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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 ...

Claims

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Application Information

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IPC IPC(8): C22C1/04H01K1/08B22F9/22B22F3/16B21J1/04B21C1/00C22F1/18
Inventor 闵邦平胡元钧张畅巫晓华曾巧华刘少霖柴朝晖刘希星管志强王健谢菊华
Owner GANZHOU HONGFEI TUNGSTEN & MOLYBDENUM MATERIALS
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