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

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

Active Publication Date: 2014-12-31
威海多晶钨钼科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

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 matrix uneven and directly affect the gold of thorium tungsten wire. The phase structure will affect the performance of thoriated tungsten wire. In order to overcome the harmful effect of potassium in the manufacturing process of thoriated tungsten materials, Chinese patent 200610033294.3 discloses a method for removing impurities such as potassium by washing with a strong acid solution, as announced in its specification In the pickling process, the method needs to repeatedly use deionized pure water, hydrochloric acid, hydrofluoric acid, deionized pure water to wash the material, filter and inspect the material, until the content of potassium in the material is reduced to less than 15PPM , before proceeding to the next step, the method steps are cumbersome, which affects the production efficiency

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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 temperatures of the five stages are 550°C, 650°C, 750°C, 850°C, and 950°C, and the holding time of each stage is 60-80min. 300-350g / boat, the reducing atmosphere is hydrogen, and the hydrogen flow is 3-5m 3 / h, reduction 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 thorium-doped tungsten powder into a ball mill tank containing a polyurethane lining for high-energy ball milling for 3-5 hours, the ball milling medium is tungsten balls, and the ball-to-material ratio...

Embodiment 2

[0034] The manufacturing process of the cathode of a discharge lamp 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, and the loading capacity is 300-350g / boat, the reducing atmosphere is hydrogen, and the hydrogen flow is 3-5m 3 / h, reduction 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 thorium-tungsten powder into a ball-milling tank with a polyurethane lining for high-energy ball milling for 3-5 hours.

[0038] (5) Pressing: isostatic pres...

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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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Patent Type & Authority Patents(China)
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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