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US 4,928,368 AGranted
Method of diffusion bonding copper and titanium alloys to produce a projectile
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsJacob Greenspan, Gasper J. Sacco
Life of this patent
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Abstract
A method of diffusion bonding copper to titanium alloy employing hot isosic pressure by an inert gas in a sealed chamber. Use of niobium metal as an interfoil between the copper and titanium alloy and the application of the method to the manufacture of a projectile is also disclosed.
Claims6
A method of diffusion bonding copper and titanium alloy comprising the steps of:
- a. providing a copper workpiece and a titanium alloy workpiece to be joined;
- b. forming a mating surface between said workpieces;
- c. juxtaposing said workpieces at said surface;
- d. providing an additional plate of titanium and welding said plate over said copper workpiece and said alloy workpiece to create an assembly having a sealed space between said plate and said alloy workpiece, said plate being in contact with said copper workpiece;
- e. evacuating and sealing said space;
- f. providing an antoclave chamber and placing said assembly in said chamber;
- g. pressurizing said chamber at a selected pressure with an inert gas;
- h. heating said chamber at a selected temperature for a selected dwell time;
- i. air cooling said chamber;
- j. removing said assembly from said chamber and removing said plate from said assembly.
7 more elements
The method of manufacturing a ballistic projectile comprising in combination the steps of:
- a. providing a quantity of titanium alloy;
- b. heating said alloy to a temperature of approximately 1,625 degrees fahrenheit;
- c. forging said alloy at said temperature to a selected preform configuration;
- d. quenching said preform in water;
- e. machining said preform to a selected projectile body configuration including the formation of a band seat about the outer circumference of said body;
- f. inserting a foil of niobium on the inside diameter of a band of copper;
- g. cold pressing said band of copper into said seat;
- h. providing an additional plate of titanium and welding said plate over said band and said body to create a sealed space between said plate and said body, said plate being in contact with the outer surface of said band;
- i. evacuating and sealing said space;
- j. providing an autoclave chamber and placing said projectile in said chamber;
- k. evacuating said chamber;
- l. pressurizing said chamber at 15,000 lbs./sq. in. with an inert gas;
- m. heating said chamber to 1,600 degrees fahrenheit for a period of approximately one hour;
- n. air cooling said chamber and said projectile;
- o. removing said projectile from said chamber and machining said plate from said body;
- p. heating said projectile to approximately 1,625 degrees fahrenheit;
- q. quenching said projectile in water;
- and
- r. age hardening said projectile at 1,200 degrees fahrenheit for one hour.
16 more elements
Dependencies are inferred from the claim text.