US3150967A - Aluminum die casting alloy - Google Patents
Aluminum die casting alloy Download PDFInfo
- Publication number
- US3150967A US3150967A US125949A US12594961A US3150967A US 3150967 A US3150967 A US 3150967A US 125949 A US125949 A US 125949A US 12594961 A US12594961 A US 12594961A US 3150967 A US3150967 A US 3150967A
- Authority
- US
- United States
- Prior art keywords
- alloy
- die casting
- aluminum
- silicon
- aluminum die
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910045601 alloy Inorganic materials 0.000 title claims description 38
- 239000000956 alloy Substances 0.000 title claims description 38
- 229910052782 aluminium Inorganic materials 0.000 title claims description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 19
- 238000004512 die casting Methods 0.000 title description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 229910052742 iron Inorganic materials 0.000 claims description 10
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 8
- 229910052725 zinc Inorganic materials 0.000 claims description 8
- 239000011701 zinc Substances 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 15
- 229910052710 silicon Inorganic materials 0.000 description 14
- 239000010703 silicon Substances 0.000 description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 239000011133 lead Substances 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 239000011135 tin Substances 0.000 description 3
- 229910052718 tin Inorganic materials 0.000 description 3
- 238000007743 anodising Methods 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- BIIBYWQGRFWQKM-JVVROLKMSA-N (2S)-N-[4-(cyclopropylamino)-3,4-dioxo-1-[(3S)-2-oxopyrrolidin-3-yl]butan-2-yl]-2-[[(E)-3-(2,4-dichlorophenyl)prop-2-enoyl]amino]-4,4-dimethylpentanamide Chemical compound CC(C)(C)C[C@@H](C(NC(C[C@H](CCN1)C1=O)C(C(NC1CC1)=O)=O)=O)NC(/C=C/C(C=CC(Cl)=C1)=C1Cl)=O BIIBYWQGRFWQKM-JVVROLKMSA-N 0.000 description 1
- -1 0.03% Chemical compound 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000001996 bearing alloy Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
Definitions
- Silicon will not oxidize under this process and, therefore, with a silicon content of 5 to 10% in an aluminum alloy casting, 510% of the surface area, being silicon, rejects the anodic coating. This has been a serious defect in past alloys, since color anodized aluminum presents a hard, smooth, bright finish which is very desirable on many products.
- the alloy We have discovered is believed to be a rather radical departure from past die casting alloys. On a weight basis, it comprises 5.0 to 5.9% zinc, 1.8 to 2.2% copper, 1.8 to 2.0% iron, .04 to 2% manganese, the remainder being aluminum of at least commercial purity. Trace or small percentages of magnesium,-lead, nickel, titanium, tin and chromium may be present. Silicon may be present in an amount not exceeding about 0.5%.
- the iron content of this alloy is considerably higher than that of other aluminum die casting alloys. We have discovered that an iron content of the quantity indicated prevents the alloy from soldering or sticking to the casting die. Nonetheless, iron fallout is low, and it is believed that the low manganese content is responsible for this characteristic. A small amount of titanium e.g. 0.03%, refines the grain structure of the alloy.
- Typical die castings made of this alloy display an ultimate tensile strength of about 37,000 p.s.i., a tensile yield strength of about 24,000 p.s.i., and an elongation in 2" of about 5 /2%.
- This alloy displays good die casting characteristics, although it should be cast in a vacuum for best results.
- castings made of an alloy in accordance with the present invention can be porcelain enameled, inert are welded, dip brazed, chromium plated, and hard anodized. No other aluminum die casting alloy is believed to possess all of these properties.
- a die castable, anodizable alloy consisting essentially of about 5.0 to 5.9% zinc, 1.8 to 2.2% copper, 1.8 to 2.0% iron, 0.04 to 0.2% manganese, and the balance aluminum of at least commercial purity.
- An alloy in accordance with claim 1 includes about 0.03% of titanium.
- An alloy in accordance with claim 1 includes about 0.10% of nickel.
- A1 alloy in accordance with claim 1 includes about 0.03% of tin.
- An alloy in accordance with claim 1 includes about 0.18% of chromium.
- a die castable, anodizable alloy consisting essentially of about 5.5 to 5.8% zinc, 1.8 to 2.2% copper, 1.8 to 2.0% iron, 0.04 to 0.1% manganese, not more than about 0.5% silicon, 0.06% magnesium, and 0.09% lead, and the balance aluminum.
- a die castable, anodizable alloy consisting essentially of about 5.5 to 5.8% Zinc, 1.9 to 2.2% copper, 1.8 to 2.0% iron, 0.04 to 0.1% manganese, not more than about 0.5% silicon, 0.06% magnesium, and 0.09% lead, 0.11% nickel, 0.04% titanium, 0.04% tin, and 0.18% chromium, and the balance aluminum.
- a die castable, anodizable alloy consisting essentially of about 5.5% zinc, 2.2% copper, 1.9% iron, 0.3% silicon, 0.05% manganese, and the balance commercially pure aluminum.
Description
United States Patent Office 3,150,967 ALUMTNUM DEE CASTHNG ALLGY Joseph A. Woltering, Cincinnati, and Dudley Fished, Hamilton, hio, assignors to Hamilton Die Cast, Inc, Hamilton, @hio, a corporation of Ghlo No Drawing. Filed July 24, 1961, Ser. No. 125,949 8 Claims. (Cl. 75-441) This invention relates to an aluminum die casting alloy.
As far as we know, there has heretofore been known no aluminum die casting alloy which could be successfully anodized both decoratively and protectively. Past alloys have been particulraly deficient in their ability to be decoratively color anodized. The reason for this appears to have been due to the presence of a substantial amount of silicon in such alloys. Silicon has heretofore been considered necessary in aluminum die casting alloys to impart suitable flow characteristics to the alloy, and because it prevents hot-shortness in the alloy, which is the tendency of a die casting alloy to crack or split upon solidification. Silicon forms an eutectic in the alloy and imparts stretchability to it with the result that the alloy does not craze or crack as it solidifies from the molten state. In the absence of a fairly large proportion of silicon, for example -10 weight percent, previously known aluminum die casting alloys have tended to be hot short. However, the presence of silicon in an aluminum die casting alloy in an amount sufilcient to prevent hot shortness renders the alloy unable to be successfully anodized, and especially poor in its ability to be color 9 anodized and hard anodized. Silicon-bearing aluminum die casting alloys darken on clear anodizing, and present a nonuniform dark gray surface. The process of anodizing is basically a process of chemically changing the surface layer of an aluminum object from aluminum to its oxide. Silicon will not oxidize under this process and, therefore, with a silicon content of 5 to 10% in an aluminum alloy casting, 510% of the surface area, being silicon, rejects the anodic coating. This has been a serious defect in past alloys, since color anodized aluminum presents a hard, smooth, bright finish which is very desirable on many products.
We have discovered a non-silicon bearing alloy which, without loss of tensile, yield, and elongation properties within the normal range for aluminum die casting alloys, displays no tendency to hot shortness and, moreover, which will take an excellent clear or color anodized finish.
The alloy We have discovered is believed to be a rather radical departure from past die casting alloys. On a weight basis, it comprises 5.0 to 5.9% zinc, 1.8 to 2.2% copper, 1.8 to 2.0% iron, .04 to 2% manganese, the remainder being aluminum of at least commercial purity. Trace or small percentages of magnesium,-lead, nickel, titanium, tin and chromium may be present. Silicon may be present in an amount not exceeding about 0.5%.
Specific analyses of several melts of alloys in accordance with this invention are as follows:
3,150,967 Patented Sept. 29, 1964 We have found that the combination of zinc, copper, and iron in the ranges indicated will form an eutectic in place of the silicon which has in the past been utilized, and moreover does not render the alloy unable to be anodized.
The iron content of this alloy is considerably higher than that of other aluminum die casting alloys. We have discovered that an iron content of the quantity indicated prevents the alloy from soldering or sticking to the casting die. Nonetheless, iron fallout is low, and it is believed that the low manganese content is responsible for this characteristic. A small amount of titanium e.g. 0.03%, refines the grain structure of the alloy.
Typical die castings made of this alloy display an ultimate tensile strength of about 37,000 p.s.i., a tensile yield strength of about 24,000 p.s.i., and an elongation in 2" of about 5 /2%.
This alloy displays good die casting characteristics, although it should be cast in a vacuum for best results.
In addition to its other properties, castings made of an alloy in accordance with the present invention can be porcelain enameled, inert are welded, dip brazed, chromium plated, and hard anodized. No other aluminum die casting alloy is believed to possess all of these properties.
What is claimed is:
1. A die castable, anodizable alloy consisting essentially of about 5.0 to 5.9% zinc, 1.8 to 2.2% copper, 1.8 to 2.0% iron, 0.04 to 0.2% manganese, and the balance aluminum of at least commercial purity.
2, An alloy in accordance with claim 1 includes about 0.03% of titanium.
3. An alloy in accordance with claim 1 includes about 0.10% of nickel.
4. A1 alloy in accordance with claim 1 includes about 0.03% of tin.
5. An alloy in accordance with claim 1 includes about 0.18% of chromium.
6. A die castable, anodizable alloy consisting essentially of about 5.5 to 5.8% zinc, 1.8 to 2.2% copper, 1.8 to 2.0% iron, 0.04 to 0.1% manganese, not more than about 0.5% silicon, 0.06% magnesium, and 0.09% lead, and the balance aluminum.
7. A die castable, anodizable alloy consisting essentially of about 5.5 to 5.8% Zinc, 1.9 to 2.2% copper, 1.8 to 2.0% iron, 0.04 to 0.1% manganese, not more than about 0.5% silicon, 0.06% magnesium, and 0.09% lead, 0.11% nickel, 0.04% titanium, 0.04% tin, and 0.18% chromium, and the balance aluminum.
8. A die castable, anodizable alloy consisting essentially of about 5.5% zinc, 2.2% copper, 1.9% iron, 0.3% silicon, 0.05% manganese, and the balance commercially pure aluminum.
which also which also which also which also References Cited in the tile of this patent UNITED STATES PATENTS 1,352,271 Jeih'ies et al. Sept. 7, 1920 2,075,090 Bonsack Mar. 30, 1937 2,290,017 Bonsack July 14, 1942 OTHER REFERENCES New Jersey Zinc Company, Die Casting for Engineers, New York, 1942, page 27.
Claims (1)
1. A DIE CASTABLE, ANODIZABLE ALLOY CONSISTING ESSENTIALLY OF ABOUT 5.0 TO 5.9% ZINC, 1.8 TO 2.2% COPPER, 1.8 TO 2.0% IRON, 0.04 TO 0.2% MANGANESE, AND THE BALANCE ALUMINUM OF AT LEAST COMMERCIAL PURITY.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US125949A US3150967A (en) | 1961-07-24 | 1961-07-24 | Aluminum die casting alloy |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US125949A US3150967A (en) | 1961-07-24 | 1961-07-24 | Aluminum die casting alloy |
Publications (1)
Publication Number | Publication Date |
---|---|
US3150967A true US3150967A (en) | 1964-09-29 |
Family
ID=22422194
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US125949A Expired - Lifetime US3150967A (en) | 1961-07-24 | 1961-07-24 | Aluminum die casting alloy |
Country Status (1)
Country | Link |
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US (1) | US3150967A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100215926A1 (en) * | 2009-02-25 | 2010-08-26 | Askin Albert L | Aluminum alloy substrates having a multi-color effect and methods for producing the same |
US8349462B2 (en) | 2009-01-16 | 2013-01-08 | Alcoa Inc. | Aluminum alloys, aluminum alloy products and methods for making the same |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1352271A (en) * | 1919-07-30 | 1920-09-07 | Aluminium Castings Company | Alloy |
US2075090A (en) * | 1936-08-17 | 1937-03-30 | Nat Smelting Co | Aluminum alloy |
US2290017A (en) * | 1941-04-17 | 1942-07-14 | Nat Smelting Co | Aluminum alloy |
-
1961
- 1961-07-24 US US125949A patent/US3150967A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1352271A (en) * | 1919-07-30 | 1920-09-07 | Aluminium Castings Company | Alloy |
US2075090A (en) * | 1936-08-17 | 1937-03-30 | Nat Smelting Co | Aluminum alloy |
US2290017A (en) * | 1941-04-17 | 1942-07-14 | Nat Smelting Co | Aluminum alloy |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8349462B2 (en) | 2009-01-16 | 2013-01-08 | Alcoa Inc. | Aluminum alloys, aluminum alloy products and methods for making the same |
US8950465B2 (en) | 2009-01-16 | 2015-02-10 | Alcoa Inc. | Aluminum alloys, aluminum alloy products and methods for making the same |
US20100215926A1 (en) * | 2009-02-25 | 2010-08-26 | Askin Albert L | Aluminum alloy substrates having a multi-color effect and methods for producing the same |
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