High content poly-component composite rare-earth tungsten electrode material and its preparing method

Abstract

The present invention belongs to the field of refractory cathode RE material, and aims at improving the machining performance of tungsten electrode material. The tungsten electrode material of the present invention contains La2O3, Y2O3 and CeO2 in 0.6-1.98 wt% each and 3.0-3.3 wt% totally except W. The preparation process includes the following steps: compounding mixed solution with lanthanum nitrate, yttrium nitrate and cerium nitrate in the amount for required RE oxide, weighing APT based on the weight of required tungsten and mixed with deionized water to form suspension, mixing with the nitrate solution via stirring and evaporation to dry; the first hydrogen reduction at 550-700 deg.c; and the secondary hydrogen reduction at 850-1000 deg.c. to form the electrode material with average size of 1.2-1.4 micron. The preparation process has no APT calcining step, and this results in simplified process, low power consumption, etc.

Description

Technical field: [0001] The invention relates to a high-content multi-element composite rare earth tungsten electrode material and a preparation method thereof, belonging to the technical field of rare earth refractory metal cathode materials. Background technique: [0002] Tungsten electrodes, as key components in inert gas shielded welding, plasma spraying, smelting, cutting and other fields, are widely used in machinery, shipbuilding, construction, metallurgy, electric power, aerospace and other industries. The tungsten electrodes currently used are mainly thoriated tungsten electrodes. , accounting for more than 80% of the entire electrode product, due to the natural radioactivity of thorium, the half-life of its alpha rays is as long as 1.4×10 13 Years, the production of thoriated tungsten wire contains 1.5% ThO 2 , the α-ray dose is 1.35×10 5 Bq / Kg, therefore, thoriated tungsten materials cause cumulative radioactive hazards to the human body and the environment duri...

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Problems solved by technology

[0002] Tungsten electrodes, as key components in inert gas shielded welding, plasma spraying, smelting, cutting and other fields, are widely used in machinery, shipbuilding, construction, metallurgy, electric power, aerospace and other industries. The tungsten electrodes currently used are mainly thoriated tungsten electrodes. , accounting for more than 80% of the entire electrode product, due to the natural radioactivity of thorium, the half-life of its alpha rays is as long as 1.4×10 13 Years, the production of thoriated tungsten wire contains 1.5% ThO 2 , the α-ray dose is 1.35×10 5 Bq / Kg, therefore, thoriated tungsten materials cause cumulative radioactive hazards to the human body and the environment during long-term production and use, and there is an urgent need for new electrode materials to replace them. Rare earth tungsten electrodes are researched and developed under this urgent need. This type of rare earth Tungsten electrodes have welding performance comparable to thoriated tungsten electrodes under different working conditions, and have begun to replace thoriated tungsten in a small range. Advantages, although thorium has cumulative radioactive hazards, there is no industrial electrode product with better comprehensive performance that can completely replace it. Therefore, thoriated tungsten electrodes have always occupied a dominant position among many tungsten electrodes.

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