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Refractory hard metals in powder form for use in the manufacture of electrodes

A hard alloy, high melting point technology, applied in nanotechnology, carbon compounds, metal borides, etc. for materials and surface science, can solve problems such as high melting temperature and difficult material forming

Inactive Publication Date: 2004-03-24
密鲁塔拉集团公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since TiB 2 and other high melting point cemented carbides have high melting temperatures and are highly covalent, making it difficult to shape these materials

Method used

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  • Refractory hard metals in powder form for use in the manufacture of electrodes
  • Refractory hard metals in powder form for use in the manufacture of electrodes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] With a SPEX 8000 (trademark) vibratory ball mill operating at about 17 Hz, 3.45 g of titanium and 1.55 g of boron were ball milled in a hard steel crucible at a ball / powder mass ratio of 4.5:1 to obtain TiB 2 powder. This operation was performed under a controlled argon atmosphere to prevent oxidation. Close the crucible and seal with a rubber O-ring. After high-energy ball milling for 5 hours, TiB was formed 2 structure, as shown in the X-ray diffraction pattern in the accompanying drawings below. TiB 2 The structure of is a hexagon with pitch P6 / mmm(191). The particle size is between 1-5 μm and the crystal size determined by X-ray diffraction is about 30 nm.

Embodiment 2

[0032] TiB was produced following the procedure described in Example 1 and under the same operating conditions, except ball milling was carried out for 20 hours instead of 5 hours 2 powder. The powder obtained was similar to that obtained in Example 1. But the crystal size is small (about 16nm).

Embodiment 3

[0034] Except for ball milling titanium and graphite, TiC powder was prepared according to the steps described in Example 1 and the same operating conditions.

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PUM

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Abstract

The invention relates to a refractory hard metal in powder form comprising particles having an average particle size of 0.1 to 30 mu m and each formed of an agglomerate of grains with each grain comprising a nanocrystal of a refractory hard metal of the formula (I): AxByXz wherein A is a transition metal, B is a metal selected from the group consisting of zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, manganese, tungsten and cobalt, X is boron or carbon, x ranges from 0.1 to 3, y ranges from 0 to 3 and z ranges from 1 to 6. The refractory hard metal in powder form according to the invention is suitable for use in the manufacture of electrodes by thermal deposition or powder metallurgy.

Description

technical field [0001] The invention relates to the field of electrodes for metal electrolysis. More specifically, the present invention relates to refractory cemented carbides in powder form for the production of such electrodes. Background of the invention [0002] Aluminum is generally dissolved in molten cryolite (Na 3 AlF 6 ) obtained from alumina. Hall-Herouert electrosmelting cells generally have a steel shell provided with a refractory insulating lining which in turn has a prebaked carbon block in contact with the molten components of the electrolyte. lining. The carbon liner serves as the cathode substrate and the pool of molten aluminum serves as the cathode. The anode is a consumable carbon electrode, typically prepared as prebaked carbon by coke calcination. [0003] During the electrolysis process in the Hall-Heroult electrolytic aluminum smelting cell, carbon anodes are consumed, releasing greenhouse gases such as CO and CO 2 . The anode has to be chang...

Claims

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Application Information

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IPC IPC(8): B02C17/00B22F1/00C01B32/921C01B35/04C04B35/622C25C3/12
CPCC01B31/305C01P2002/60C01B31/30C01P2004/61C25C3/12C01B31/303C01P2002/72C01B31/301C01P2004/64B82Y30/00C01P2004/50C01P2004/62C01B35/04C01B32/90C01B32/907C01B32/914C01B32/921
Inventor S·布瓦伊M·布劳因
Owner 密鲁塔拉集团公司
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