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Method for preparing barium tungsten electrode

An electrode, barium tungsten technology, which is applied in the field of barium tungsten electrode preparation, can solve the problems of high production cost and complicated preparation process of tungsten sponge, and achieve the effects of prolonging service life, easy control of product quality, and enhanced light intensity

Inactive Publication Date: 2012-07-25
GUANGZHOU HUIFENG ELECTRONICS SCI & TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method relies on tungsten sponge, which is complicated to prepare and expensive to produce

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0020] A preparation method of a barium tungsten electrode, comprising the following steps:

[0021] 1) using a volatile solvent to dissolve the paraffin to obtain a paraffin solution;

[0022] 2) Ba(Ca)ZrO 3 powder, tungsten powder, and paraffin solution are evenly mixed, the solvent is removed, the mixed powder obtained is poured into an electrode mold, and pressed;

[0023] 3) Heat the pressed electrode to 500-600°C at a rate of 100-150°C / hour, then heat it to 1300-1500°C at a rate of 190-200°C / hour and keep it warm for 0.6-1.3 hours, then heat it to 1800 ~2000℃ for 15~30 minutes;

[0024] 4) Treat the electrode with hydrogen at 1250-1350°C for 10-20 minutes to obtain a barium-tungsten electrode.

[0025] Preferably, Ba(Ca)ZrO 3 Powder: tungsten powder: paraffin wax=5~7:88~96:2~4 (mass ratio).

[0026] If the surface of the electrode becomes dark and black after the hydrogen burning treatment, put the electrode back in a vacuum resistance furnace and heat it to 1800-20...

Embodiment 1

[0037] 1) Dissolve 3 parts of paraffin with gasoline to obtain a paraffin solution;

[0038] 2) Add 5 parts of Ba(Ca)ZrO to the paraffin solution 3 Powder, 92 parts of tungsten powder, mix evenly, heat to make gasoline completely volatilize, wherein, tungsten powder is doped with 0.30% Al 2 o 3 pink;

[0039] 3) Pour the obtained mixed powder into the electrode mold at 15T / cm 2 The pressure is pressed to obtain the electrode;

[0040] 4) Heat the pressed electrode to 600°C at a rate of 120-130°C / hour in a vacuum resistance furnace, then heat it to 1400°C at a rate of 190-200°C / hour and keep it for 1 hour, then heat it to 1900°C keep warm for 20 minutes;

[0041] 5) Treat the electrode with hydrogen at 1250-1350°C for 10-20 minutes to obtain a barium-tungsten electrode.

Embodiment 2

[0043] 1) Dissolve 2 parts of paraffin with gasoline to obtain a paraffin solution;

[0044] 2) Add 7 parts of Ba(Ca)ZrO to the paraffin solution 3 Powder, 88 parts of tungsten powder, mix evenly, heat to make gasoline completely volatilize, wherein, tungsten powder is doped with 0.25% Al 2 o 3 pink;

[0045] 3) Pour the obtained mixed powder into the electrode mold at 12T / cm 2 The pressure is pressed to obtain the electrode;

[0046] 4) Heat the pressed electrode to 550°C at a rate of 140-150°C / hour in a vacuum resistance furnace, then heat it to 1500°C at a rate of 190-200°C / hour and keep it for 0.6 hours, then heat it to 2000°C keep warm for 15 minutes;

[0047] 5) Treat the electrode with hydrogen at 1250-1350°C for 10-20 minutes to obtain a barium-tungsten electrode.

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Abstract

The invention discloses a method for preparing a barium tungsten electrode, which comprises the following steps of: uniformly mixing Ba(Ca) ZrO3 powder with tungsten powder and a paraffin wax solution, removing a solvent, and pressing an electrode; raising the temperature of the pressed electrode to remove wax, and then warming to 1800-2000 DEG C to preserve heat; and carrying out hydrogen burning treatment for the electrode, and obtaining the barium tungsten electrode. The method for preparing the barium tungsten electrode is simple to operate, and the quality of product is easily controlled. The electron emission ability of the prepared barium tungsten electrode is improved, the electronic current density of electronic emission is increased, and the light intensity is increased. The glow starting speed of an HID lamp can be improved. When the lamp is used in a stroboscopic state, the stroboscopic frequency can be obviously increased, and the non-flickering phenomenon does not exist.The working temperature of the electrode is reduced, and the service life of the lamp is prolonged.

Description

technical field [0001] The invention relates to a method for preparing an electrode, in particular to a method for preparing a barium-tungsten electrode. Background technique [0002] HID lamps have excellent performance and a wide range of applications, and are generally welcomed by people. [0003] The electrode made of barium-tungsten alloy has the characteristics of low work function?=1.6ev, high current density of 10A / cm2, excellent start-up performance and large energy output in HID lamps. Its low escape function can make electric vacuum and laser devices, and the electron emission performance of electric light source products can reach from low to high repetition frequency (1-40 times / second). The start-up performance of the strobe lamp using barium-tungsten electrodes is significantly improved, and it can be started normally when it is lower than 10% of the city supply voltage (220V). Because the emission current density of the electrode is greatly improved, the br...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J9/04
Inventor 涂祥元
Owner GUANGZHOU HUIFENG ELECTRONICS SCI & TECHCO
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