Spray quenching of metal with liquid coolant containing dissolved gas
AssigneeAluminum Company of America
InventorsHo Yu, Jeffrey A. Nicol, Daniel E. Hunter, Robert A. Ramser
Life of this patent
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Abstract
A method of quenching a metal object having steps of: (a) providing a liquid coolant having a temperature from about 100.degree. F. to about 180.degree. F. and containing about 0.01 to about 0.1 standard cubic feet of carbon dioxide gas per gallon of water dissolved therein; and (b) spraying the liquid coolant on the metal object to quench the metal object.
Claims17
A method of quenching metal objects selected from the group consisting of aluminum, iron, magnesium and alloys thereof comprising:
- (a) providing a liquid coolant having a temperature from about 100.degree. F. to about 180.degree. F. and consisting essentially of water and sufficient quantity of deliberately dissolved carbon dioxide to retard cooling as compared to water of the same temperature without said deliberately dissolved carbon dioxide, the amount of said dissolved carbon dioxide being present from about 0.01 to about 0.10 standard cubic feet of gas per gallon of water, the dissolved carbon dioxide being higher for lower water temperatures and lower for higher water temperatures;
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- (b) spraying said liquid coolant on said metal objects to quench said metal objects.
A method of quenching solid metal objects selected from the group consisting of aluminum, iron, magnesium and alloys thereof comprising:
- (a) providing a reservoir of liquid coolant having a temperature from about 100.degree. F. to about 180.degree. F. and consisting essentially of water and sufficient quantity of deliberately dissolved carbon dioxide to retard cooling as compared to water of the same temperature without said deliberately dissolved carbon dioxide, the amount of said dissolved carbon dioxide being present from about 0.01 to about 0.10 standard cubic feet of gas per gallon of water, the dissolved carbon dioxide being higher for lower water temperatures and lower for higher water temperatures;
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- (b) spraying said liquid coolant on said solid metal objects to quench metal.
A method of quenching a solid metal object selected from the group consisting of aluminum, iron, magnesium and alloys thereof comprising spraying a solid metal object heated to a temperature of 800.degree. to 1100.degree. F. with a liquid coolant consisting essentially of deliberately dissolved carbonated water to retard cooling as compared to water of the same temperature without said deliberately dissolved carbon dioxide, the amount of said dissolved carbon dioxide being present from about 0.01 to about 0.10 standard cubic feet of gas per gallon of water, the dissolved carbon dioxide being higher for lower water temperatures and lower for higher water temperatures, said liquid coolant being at a temperature from about 100.degree. F. to about 180.degree. F. and.
A method of quenching wrought metal objects selected from the group consisting of aluminum, iron, magnesium and alloys thereof comprising:
- (a) placing water under pressure;
- (b) injecting pressurized carbon dioxide gas into said pressurized water to form a pressurized mixture of water and deliberately dissolved carbon dioxide gas, said mixture having a temperature from about 100.degree. F. to about 180.degree. F., said mixture retards cooling as compared to water of the same temperature without said deliberately dissolved carbon dioxide, the amount of said dissolved carbon dioxide being present from about 0.01 to about 0.10 standard cubic feet of gas per gallon of water, the dissolved carbon dioxide being higher for lower water temperatures and lower for higher water temperatures;
- (c) dissolving said carbon dioxide gas in said pressurized mixture to form a solution consisting essentially of dissolved gas and water;
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- (d) spraying heated wrought metal objects one or more at a time with said solution to quench said wrought metal objects.
A method of quenching wrought metal objects selected from the soup consisting of aluminum, iron, magnesium and alloys thereof comprising:
- (a) providing a reservoir of water;
- (b) removing a portion of said water and injecting pressurized carbon dioxide gas into said portion under pressure to form a pressurized mixture of water, and carbon dioxide gas;
- (c) dissolving said carbon dioxide gas in said pressurized mixture to thereby form an aqueous solution consisting essentially of water and carbon dioxide gas dissolved therein, said mixture having a temperature from about 100.degree. F. to about 180.degree. F., said mixture retards cooling as compared to water of the same temperature without said carbon dioxide, the amount of said dissolved carbon dioxide being present from about 0.01 to about 0.10 standard cubic feet of gas per gallon of water, the dissolved carbon dioxide being higher for lower water temperatures and lower for higher water temperatures;
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- (d) spraying said aqueous solution on heated wrought metal objects one or more at a time to quench said wrought metal object.
A method of quenching wrought metal objects selected from the group consisting of aluminum, iron, magnesium and alloys thereof comprising:
- (a) providing a reservoir of water having a temperature in a range of about 100.degree. F. to about 180.degree. F.;
- (b) feeding a portion of said reservoir into a pressurized mixer;
- (c) dissolving said carbon dioxide gas in said portion with carbon dioxide gas to form a solution consisting essentially of water and carbon dioxide gas dissolved, said solution retards cooling as compared to water of the same temperature without said deliberately dissolved carbon dioxide, the amount of said dissolved carbon dioxide being present from about 0.01 to about 0.10 standard cubic feet of gas per gallon of water, the dissolved carbon dioxide being higher for lower water temperatures and lower for higher water temperatures;
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- (d) spraying said solution on heated wrought metal objects one or more at a time in said reservoir to quench them.
Dependencies are inferred from the claim text.