[특허]Strip casting of immiscible metals

Strip casting of immiscible metals 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B22D-007/10
출원번호	US-0734113 (2007-04-11)
등록번호	US-8403027 (2013-03-26)
발명자 / 주소	Tomes, Jr., David A. Wyatt-Mair, Gavin F. Timmons, David W. Unal, Ali
출원인 / 주소	Alcoa Inc.
대리인 / 주소	Greenberg Traurig, LLP
인용정보	피인용 횟수 : 0 인용 특허 : 99

초록 ▼

The present invention discloses a method of strip casting an aluminum alloy from immiscible liquids that yields a highly uniform structure of fine second phase particles. The results of the present invention are achieved by using a known casting process to cast the alloy into a thin strip at high speeds. In the method of the present invention, the casting speed is preferably in the region of about 50-300 feet per minute (fpm) and the thickness of the strip preferably smaller than 0.08-0.25 inches. Under these conditions, favorable results are achieved when droplets of the immiscible liquid phase nucleate in the liquid ahead of the solidification front established in the casting process. The droplets of the immiscible phase are engulfed by the rapidly moving freeze front into the space between the Secondary Dendrite Arms (SDA).

대표청구항 ▼

1. A method of casting metals comprising: providing a molten aluminum alloy to a casting apparatus, the molten aluminum alloy comprising at least about 0.1 weight percent alloying addition, wherein the alloying addition is substantially immiscible with molten aluminum,the casting apparatus having a first casting surface, a second casting surface, and a nip formed between the first and second casting surface, the nip having a thickness ranging from 0.08 inches to 0.25 inches;advancing the aluminum alloy at a speed ranging from between 50 feet per minute and about 300 feet per minute, wherein a point of complete solidification of the aluminum alloy is formed at the nip, wherein the aluminum alloy is advanced through the nip, by rotation of the first casting surface and by rotation of the second casting surface, wherein fine droplets of the immiscible alloying addition nucleate ahead of a solidification front created in the aluminum alloy thereby depositing the fine droplets between secondary dendrite arms of the aluminum alloy, wherein the fine droplets are less than three microns in size, and wherein the fine droplets of the immiscible alloying addition are uniformly distributed throughout the alloy. 2. The method according to claim 1 wherein the alloying addition comprises at least one of Sn, Pb, Bi and Cd. 3. The method according to claim 1 wherein the alloying addition comprises at least 0.1 weight % Sn. 4. The method according to claim 1 wherein the alloying addition comprises at least 0.1 weight % Pb. 5. The method according to claim 1 wherein the alloying addition comprises at least 0.1 weight % Bi. 6. The method according to claim 1 wherein the alloying addition comprises at least 0.1 weight % Cd. 7. A method of casting metals comprising: providing a molten aluminum alloy to a casting apparatus, the molten aluminum alloy comprising about 6 weight percent tin,the casting apparatus having a first casting surface, a second casting surface, and a nip formed between the first and second casting surface, the nip having a thickness ranging from 0.08 inches to 0.25 inches; andforming a point of complete solidification of the aluminum alloy at the nip, wherein fine droplets of the tin nucleate ahead of a solidification front created in the aluminum alloy thereby depositing the fine droplets of tin between secondary dendrite arms of the aluminum alloy, wherein the fine droplets of tin are less than three microns in size, and wherein the fine droplets of the tin addition are uniformly distributed throughout the alloy. 8. The method of casting metals of claim 7, further comprising advancing the aluminum alloy at a speed ranging from between 50 feet per minute and about 300 feet per minute. 9. The method of casting metals of claim 8, wherein the aluminum alloy is advanced through the nip by rotation of the first casting surface and by rotation of the second casting surface.

이 특허에 인용된 특허 (99)

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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