Method for producing tungsten bar serving as halogen tungsten lamp tungsten filament

A technology of halogen tungsten lamp and tungsten wire, which is applied in the field of tungsten powder metallurgy, can solve the problems of low start and stop recrystallization temperature, low high temperature strength, poor high temperature sag resistance and deformation resistance, etc., and achieve the effect of fine and uniform cross-sectional crystallization

Active Publication Date: 2011-09-28
GANZHOU HONGFEI TUNGSTEN & MOLYBDENUM MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

my country's tungsten wire production technology started relatively late, and the production line of tungsten wire for halogen tungsten lamps is still blank in China. With conventional technology, the production line of ordinary tungsten wire can only obtain medium and low-grade tungsten wire for halogen tungsten lamps, resulting in finished products Low efficiency and high production cost; at the same time, due to the low re

Method used

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Effect test

Embodiment 1

[0019] A method for preparing a tungsten bar for making a tungsten wire of a tungsten-halogen lamp, comprising the following steps:

[0020] 1. Mix monoclinic ammonium paratungstate and spherical ammonium paratungstate at a ratio of 3:1.5 in a double cone mixer for 20 minutes;

[0021] 2. Pre-reduction, the above raw materials are reduced to blue tungsten oxide through the reduction furnace with four temperature zones;

[0022] 3. Blue tungsten is doped with high potassium. Add 200kg of blue tungsten oxide into the doping machine. Based on the weight of blue tungsten, add 0.18% potassium, 0.32% silicon and 0.012% aluminum by wet method, and stir and mix , High-potassium blue tungsten was obtained after steam drying;

[0023] 4. Reduction, fine-grained tungsten powder with a Fischer particle size of 2.0-2.6um and coarse-grained tungsten powder with a Fischer particle size of 3.4-4.0um are produced by conventional processes.

[0024] The production process conditions of medium...

Embodiment 2

[0033] A method for preparing a tungsten bar for making a tungsten wire of a tungsten-halogen lamp, comprising the following steps:

[0034] 1. Mix monoclinic ammonium paratungstate and spherical ammonium paratungstate at a ratio of 3:1.2 in a double cone mixer for 20 minutes;

[0035] 2. Pre-reduction, the above raw materials are reduced to blue tungsten oxide through the reduction furnace with four temperature zones;

[0036] 3. Blue tungsten is doped with high potassium. Add 200kg of blue tungsten oxide into the doping machine. Based on the weight of blue tungsten, add 0.2% potassium, 0.35% silicon and 0.013% aluminum by wet method, and stir and mix , High-potassium blue tungsten was obtained after steam drying;

[0037] 4. Reduction, fine-grained tungsten powder with a Fischer particle size of 2.0-2.6um and coarse-grained tungsten powder with a Fischer particle size of 3.4-4.0um are produced by conventional processes.

[0038] The production process conditions of medium pa...

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Abstract

The invention provides a method for producing a tungsten bar serving as a halogen tungsten lamp tungsten filament, comprising the following steps of: material selecting, pre-reducing, high potassium doping, reducing, acid rinsing, powder preparing, cold static pressure shaping, high temperature sintering and the like. Compared with the conventional technology, the method is characterized in that two crystal ammonium paratungstates are utilized to prepared raw materials, high potassium doping is adopted, preparation of middle granule tungsten powder is added, a powder distribution scheme is optimized by the middle granule tungsten and a unique incipient fusion high temperature sintering process is utilized. In the method, the granularity distribution of the tungsten powder avoids the peak or double peak phenomenon and has good normal distribution, after being sintered at high temperature, the cross section crystal of the tungsten bar is thin and uniform; the tungsten bar is pressed by a powder mixing scheme; according to a forming mechanism of potassium foams, the number of tungsten bar cross section crystal grains is increased; and the partial growth of the crystal grains is avoided so that the potassium foam is small in aperture, large in density, multiple in crystal boundary, long in line and uniform in distribution.

Description

technical field [0001] The invention relates to tungsten powder metallurgy technology, in particular to a method for preparing tungsten bars used for making tungsten wires of 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%. Tungsten-halogen lamps are mainly used in lighting systems in the above-mentioned industries. Tungsten-halogen lamps have the characteristics of shock and vibration in the use environment, so 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, the high-temperature strength is high under high-temperature ignition state, Good anti-sag performance and anti-deformation performance under high temperature. The production process of tungsten wire is...

Claims

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Application Information

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IPC IPC(8): B22F3/16B22F9/22
Inventor 闵邦平胡元钧王竹青曾巧华柴朝晖刘希星刘少霖
Owner GANZHOU HONGFEI TUNGSTEN & MOLYBDENUM MATERIALS
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