Sinter-bonded direct pin connections for inert anodes

An inert anode and inert electrode technology, applied in the field of low-resistance electrical connection, can solve the problems of unsuitable assembly parts, inert material cracking and electrical connection resistance, etc.

Inactive Publication Date: 2006-06-28
ARCONIC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, differential thermal growth between the pin and the ceramic or cermet over the assembly and processing temperature range can cause cracking of the inert material and / or increased resistance of the electrical connection, rendering the assembly unsuitable for continued use

Method used

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  • Sinter-bonded direct pin connections for inert anodes
  • Sinter-bonded direct pin connections for inert anodes
  • Sinter-bonded direct pin connections for inert anodes

Examples

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example 1

[0029] An electrode assembly was prepared using a hollow inert anode, a metallic conductor comprising Inconel 600, and a coating on the conductor made of a copper-nickel alloy. The anode was isostatically pressed from powder with a hollow opening 0.813 inches (2.06 cm) in diameter. The porosity of the anode after pressing is about 40% by volume. The pins were 0.75 inches (1.9 cm) in diameter and the surface additive coating was flame sprayed to a thickness of 0.030 inches (0.076 cm) around the pins. The composition of the coating is 67.8% by weight of copper, 30.6% by weight of nickel and a small amount of iron, manganese, titanium and other impurities. In an argon atmosphere, the anode is sintered at 1250°C until a true density is obtained, with a porosity of about 1% to 5% by volume. The co-contraction allows the sintered anode material to contact the pin and coating and form a continuous coherent electrical contact at the interface. The bond is strong enough to act as a ...

example 2

[0032] A series of 24 anodes were fabricated and tested in a statistically designed experimental matrix. Each electrode assembly was prepared using a hollow inert anode, a metal conductor, and an additive coating on the conductor. The conductors include copper-nickel alloys. The anode is isostatically pressed from powder with hollow openings of different diameters. The composition of the coating is 67.8% by weight of copper, 30.6% by weight of nickel and the balance of iron, manganese, titanium and other impurities. In an argon atmosphere, the anode is sintered at 1250°C until a true density is obtained, with a porosity of about 1% to 5% by volume. Co-shrinkage allows the sintered anode material to contact the pins and coating and form a continuous coherent electrical contact at their interface. The bond is strong enough to act as a mechanical support. The final anode dimensions were 6 inches (15.24 cm) long and 3 inches (7.62 cm) in diameter with a hemispherical base.

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Abstract

A sintered electrode assembly is made of an inert electrode (15) containing a sealed metal conductor (20) having a surface feature (30) such as a coating or wrapping which aids in bond formation with the inert electrode (15) at their interface (45), where the metal conductor (20) is directly contacted by and is substantially surrounded by the inert electrode (15) without the use of metal foam or metal powders.

Description

technical field [0001] This invention relates to low resistance electrical connections between solid metal pin conductors and the interior of ceramic or cermet inert anodes used in the electrolytic production of metals such as aluminum. Background technique [0002] Many metals including aluminum, lead, magnesium, zinc, zirconium, titanium and silicon can be produced by electrolysis. Each of these electrolysis methods uses electrodes in a highly corrosive environment. [0003] An example of an electrolytic process for metal production is the well known Hall-Heroult process for the production of aluminium, in which aluminum oxide dissolved in a bath of molten fluoride is electrolyzed at a temperature of about 960°C to 1000°C. As is commonly practiced today, this method relies on carbon as the anode to reduce alumina to molten aluminium. The carbon electrode is oxidized mainly to form CO 2 , which is released in gaseous form. Although carbon is commonly used as the electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P19/00B01D59/40B01D59/50C25B7/00C25B11/00C25C3/00C25C3/12C25C5/04C25C7/00C25C7/02C25D17/10
CPCC25C3/12C25C7/025Y10T29/532Y10T29/53204
Inventor L·E·小达斯托尔福
Owner ARCONIC INC
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