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Method of manufacturing aluminum and aluminum alloy sputtering targets

a technology of sputtering target and aluminum alloy, which is applied in the direction of vacuum evaporation coating, sputtering coating, coating, etc., can solve the problems of high process cost, high follow-up process complexity, and relatively high investment of equipment for fabricating aluminum alloy targets. , to achieve the effect of high yield and high productivity

Inactive Publication Date: 2007-06-21
NAT CHUNG SHAN INST SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for manufacturing high-quality aluminum alloy targets suitable for semiconductor and optoelectronic industries. The method does not require post-sintering, hot pressing, or forging and rolling processes, and can be carried out in vacuum environments. The method is a direct-chill casting method that allows for continuous production and results in targets with a thin surface composition segregation layer and a fine cast grain structure. The method can be used to fabricate targets alloyed with various elements and is suitable for mass-producing high-quality aluminum alloy targets.

Problems solved by technology

Because there exists the problems of shrinkage voids, air voids, large grain sizes, and composition segregation in structures made by normal casting, the fabricated ingot has to be refined to improve its structure.
Although this method can fabricate grains with sizes below 20 micrometers, the disadvantages thereof are complex and time-consuming of follow-up processes, and expensive process costs.
Nevertheless, because the method needs to be operated in a high-vacuum environment, equipment investments for fabricating aluminum alloy targets is relatively costly.
Besides, the method needs two passes of melting, which consequently lengthens production time.
Accordingly, the traditional casting processes of fabricating aluminum and aluminum alloy targets are relatively complicated.

Method used

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  • Method of manufacturing aluminum and aluminum alloy sputtering targets

Examples

Experimental program
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Effect test

embodiment 1

[0014] A pure aluminum ingot with high purity is added into a graphite crucible with 500 kg capacity. After the aluminum ingot is melt completely by heating the crucible using heating wires, a pure magnesium ingot and an aluminum-silicon master alloy are added, and the temperature of the aluminum melt is raised above the liquidus temperature. After the raw materials are melting, the aluminum melt is dreg-removed, degassed, and held. Then, the aluminum melt is injected into a flooding tank system. When the melt flows past the flooding tank, it is degassed in situ and is filtered by a porous ceramic filtering board to reduce contents of hydrogen and miscellaneous non-metal articles in the aluminum melt. Besides, casting is carried out above the liquidus temperature, wherein the casting uses a 4-inch direct-chill mold with four mold cavities. After casting is completed, four aluminum-silicon-magnesium alloy sticks with a 3-meter length and a 4-inch diameter are attained. Afterwards, bo...

embodiment 2

[0016] A pure aluminum ingot with high purity is added into a graphite crucible with 500 kg capacity. After the aluminum ingot is melt completely by heating the crucible using heating wires, a pure titanium flake is added, and the temperature of the aluminum melt is raised above the liquidus temperature of the Al—Ti phase diagram to make the added titanium flake melt completely. Meanwhile, inert gas is introduced to prevent severe oxidation of the aluminum melt under high temperatures. After the raw materials are melting, the aluminum melt is dreg-removed, degassed, and held. Then, the aluminum melt is injected into a flooding tank system. When the melt flows past the flooding tank, it is degassed in situ and is filtered by a porous ceramic filtering board to reduce contents of hydrogen and miscellaneous non-metal articles in the aluminum melt. Besides, casting is carried out above the liquidus temperature of the Al—Ti phase diagram, wherein the casting uses a 4-inch direct-chill mo...

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Abstract

A manufacturing method of sputtering targets uses a direct-chill method to fabricate various aluminum and aluminum alloy ingots. Without the need of follow-up forging processes, the fabricated aluminum alloy ingots can be cut to attain aluminum and aluminum alloy sputtering targets. The method according to the present invention features the advantages of few process steps, high productivity, and high yield. In addition, the fabricated targets have small grains, fine precipitate phases, and homogeneous composition.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a manufacturing technology of aluminum and aluminum alloy targets used for thin-film sputtering in semiconductor and optoelectronic industries. By using a direct-chill casting method, aluminum and aluminum alloy targets suitable for semiconductor and optoelectronic industries can be manufactured. BACKGROUND OF THE INVENTION [0002] Aluminum thin films have the characteristics of high reflectivity and low resistivity, thereby they are usually applied in manufacturing reflection layers of CD-ROMs, interconnection layers of semiconductors, and electrode layers of display devices. In general, apparatus for manufacturing aluminum alloy thin films is mainly by sputter processes. A sputter process uses plasma to bombard targets, so that the surface atoms of the target are scattered to escape the surface thereof and are deposited on a substrate. After processes of adhesion, adsorption, surface migration, and nucleation, a thin fi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B22D11/124
CPCB22D11/003B22D21/007C23C14/3414
Inventor TORNG, SHANYOUNG, CHUNE-CHINGCHEN, SHIH-YINGHSU, PO-CHUNPENG, CHIA-HSIANGTSENG, FAN-CHUNLUO, REN-AN
Owner NAT CHUNG SHAN INST SCI & TECH