Negative electrode material for high intensity discharge lamp and manufacturing method thereof

A high-intensity discharge lamp and cathode material technology, which is applied in the field of metal material manufacturing, can solve the problems of serious discharge arc drift, reduce the life of the discharge lamp, and cumbersome steps, etc., and achieve slow grain growth, maintain shape stability, increase The effect of service life

Active Publication Date: 2013-10-09
威海多晶钨钼科技有限公司
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Problems solved by technology

However, the tip of the thoriated tungsten cathode made of thorium oxide reinforced tungsten material is easily deformed due to high temperature during use, resulting in serious discharge arc drift and shortening the service life of the discharge lamp.
[0004] In the manufacturing process of the existing discharge lamp cathode material, the tungsten oxide powder used to prepare the thoriated tungsten material is often mixed with impurities such as potassium, iron, nickel, calcium, silicon, aluminum, etc., after reduction treatment at a certain temperature , the above-mentioned impurities other than thorium oxide enter the tungsten powder. When sintering, these impurities can promote the aggregation of thorium oxide particles, which will make the distribution of thorium oxide particles in the tungsten

Method used

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  • Negative electrode material for high intensity discharge lamp and manufacturing method thereof

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Effect test

Embodiment 1

[0025] The manufacturing process of a discharge lamp cathode with a specification of Ф15mm is as follows

[0026] (1) Doping: Thorium nitrate, potassium aluminum silicon and blue tungsten powder are mixed and dried in the doping pot, and then enter the reduction furnace;

[0027] (2) Reduction: The reduction furnace adopts a 5-stage temperature-controlled reduction process. The five-stage temperatures are 550°C, 650°C, 750°C, 850°C, and 950°C. The holding time for each stage is 60-80min. 300-350g / boat, the reducing atmosphere is hydrogen, and the flow rate of hydrogen is 3-5m 3 / h, reduce to obtain thoriated tungsten powder containing trace potassium elements, and the powder particle size is controlled at 1.5-1.9 μm;

[0028] (4) High-energy ball milling: put the reduced doped thoriated tungsten powder into a ball milling tank lined with polyurethane for high-energy ball milling for 3-5 hours, the ball milling medium is tungsten balls, and the ball-to-material ratio is 5:1; ...

Embodiment 2

[0034] The manufacturing process of a discharge lamp cathode with a specification of Ф25mm is as follows:

[0035] (1) Doping: Thorium nitrate, potassium aluminum silicon and blue tungsten powder are mixed and dried in the doping pot, and then enter the reduction furnace;

[0036] (2) Reduction: The reduction furnace adopts a 5-stage temperature-controlled reduction process. The temperatures of the five stages are 550, 650, 750, 850, and 950°C respectively. The holding time of each stage is 60-80min. The loading capacity is 300-350g / Boat, reducing atmosphere is hydrogen, hydrogen flow rate is 3-5m 3 / h, reduce to obtain thoriated tungsten powder containing trace potassium elements, and the powder particle size is controlled at 1.5-1.9 μm;

[0037] (4) High-energy ball milling: Put the reduced doped thoriated tungsten powder into a ball milling tank lined with polyurethane for high-energy ball milling for 3-5 hours. The ball-milling medium is tungsten balls, and the ball-to-m...

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Abstract

The invention relates to the field of metal material manufacturing technology, and specifically relates to a negative electrode material for a high intensity discharge lamp and a manufacturing method thereof. The negative electrode material comprises the following components: 1.5%-2.0% of thorium oxide, 0.0020%-0.0080% of potassium and 97%-98% of tungsten. Compared with a conventional negative electrode material, the negative electrode material provided by the invention has the following advantages that (1) thorium oxide particles of a thorium tungsten negative electrode even if 0.0020%-0.0080% of potassium is doped are fine and uniformly distributed; and (2) the thorium tungsten negative electrode contains a trace amount of potassium element, and by adopting the potassium-doped tungsten thorium negative electrode, the growth speed of crystal particles is slow, the tip shape of the electrode can be stably maintained, and the service life of the discharge lamp is prolonged.

Description

technical field [0001] The invention relates to the technical field of metal material manufacturing, in particular to a cathode material for a high-intensity discharge lamp and a manufacturing method thereof. Background technique [0002] High Intensity Discharge Lamp (High Intensity Discharge Lamp), also known as gas discharge lamp, is composed of a bulb made of quartz glass and a cathode and an anode oppositely arranged in the bulb. Xenon or mercury vapor is introduced into the bulb. An arc is generated and light is emitted. High-intensity discharge lamps have high brightness, emit bright hues that are closer to sunlight, have low power consumption, high reliability, and are not affected by voltage fluctuations. They are widely used in road lights, car lights, projectors, and other fields. [0003] The key components of high-intensity discharge lamps are the electrodes, which carry the current and emit electrons. Due to the high temperature of the arc in the lamp tube du...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C1/04C22F1/18C21D8/00H01J61/06H01J9/02
Inventor 李猛进张海坡袁瑞杰
Owner 威海多晶钨钼科技有限公司
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