Process for producing clad metals

Claim 2

Process for producing clad metals comprising, in sequential combination, covering a surface of a base material with a cladding material substantially in a powdery state, binding said cladding material and said base material by compaction under static fluid pressure in order to obtain a laminated body, and raising the temperature of said laminated body to a sintering temperature of said base material and cladding material, thereby resulting in mutual diffusion at the border between said materials, combinations of said cladding material and core material being chosen from a member selected from the group consisting of nickel base alloy with copper, nickel base alloy with aluminum, steel containing carbon with copper, steel containing carbon with aluminum, aluminum with copper, Fe-Ni alloy with copper, magnesium with silver, type 2024 high-strength aluminum alloy with type 6053 corrosion-resistant aluminum alloy, type 5052 aluminum alloy with copper, copper-beryllium alloy with copper, austenite-type stainless steel with cupro-nickel, copper phosphate with silver, copper with nickel, copper with silver, and stainless steel with copper, the core material being the first-mentioned metallic material of each member of the group and the cladding material being the second-mentioned metallic material of each member of the group.

Claim 3

Process for producing clad metals as claimed in claim 1, in which hydrostatic pressure is used for said compaction.

Claim 4

Process for producing clad metals as claimed in claim 1, in which static inert gas pressure is used for said compaction.

Claim 5

Process for producing clad metals as claimed in claim 1, in which said compaction is carried out at a static fluid pressure in a range of 1,500 to 20,000 kg/cm 2 .

Claim 6

Process for producing clad metals as claimed in claim 1, in which said temperature is lower by 50° to 500° C than the lower melting point of either of said materials.

Claim 7

Process for producing clad metals as claimed in claim 1, further comprising maintaining said raised temperature for 1 to 20 hours.

Claim 8

Process for producing clad metals as claimed in claim 1, in which said step of raising said temperature is carried out in a deoxidizable atmosphere.

Claim 9

Process for producing clad metals as claimed in claim 1, in which the step of raising said temperature is carried out in a non-oxidizable atmosphere.

Claim 10

Process for producing clad metals as claimed in claim 1, in which the step of raising said temperature is carried out in a vacuum.

Claim 11

Process for producing clad metals as claimed in claim 9, in which the degree of vacuum is in a range from 10 -2 to 10 -6 torr.

Claim 12

Process for producing clad metals as claimed in claim 1, in which said base material is in the form of a circular rod core further comprising the steps of forming a confined cylindrical space around said rod core, and filling said space with said cladding material prior to said binding step.

Claim 13

Process for producing clad metals as claimed in claim 11, in which the compaction ratio of said cladding material within said space is in a range of 20 to 40.

Claim 14

Process for producing clad metals as claimed in claim 1, in which said base material is in the form of a substantially flat plate further comprising the steps of forming a confined space on a side of said cladding material, and filling said space with said powdered cladding material prior to binding said materials.

Claim 15

Process for producing clad metals as claimed in claim 13, in which the compaction ratio of said cladding material is in a range of 20 to 40.

Claim 16

Process for producing clad metals as claimed in claim 13, in which the step of forming said space comprises the step of surrounding said side of said base material with a rubber casing, which should be removed and removing said casing after said compaction.

Claim 17

Process for producing clad metals as claimed in claim 15, further comprising the steps of covering said rubber casing with a back-up metal box, and removing said back-up metal box after said step of filling said space with said cladding material.

Claim 18

A process according to claim 1, comprising the additional steps of covering said laminated body with a further metallic cladding material, binding by compaction under static fluid pressure said further cladding material with said first cladding material in order to obtain a multi-laminated body, and raising the temperature of said multi-lamintated body to a sintering temperature of said base material and said cladding materials, thereby resulting in mutual diffusion at the borders between said materials.

Claim 19

Process for producing clad metals as claimed in claim 17, in which said base material is in the form of a core tube, further comprising the steps of forming a confined cylindrical space around said core tube, and filling said confined cylindrical space formed around said tube with said further cladding material.

Claim 20

Process for producing clad metals as claimed in claim 18, in which compaction ratio of said further cladding material is in a range of 20 to 40.

Claim 21

Process for producing clad metals as claimed in claim 18, in which the step of forming said cylindrical space comprises the step of surrounding said core tube with a rubber tube, having an internal diameter greater than the external diameter of said core tube, and removing said rubber tube after said compaction.

Claim 22

Process for producing clad metals as claimed in claim 18, further comprising the step of inserting a back-up metal rod snugly into said core tube, covering said rubber tube with a back-up metal pipe, and removing said back-up metal rod after said cladding materials have filled said confined spaces.

Claim 23

A process for producing clad materials comprising, in sequential combination, covering a surface of a metallic base material comprising a nickel-base alloy with a first metallic cladding material comprising copper substantially in a powdery state, binding said first cladding material and said base material by compaction under static fluid pressure in order to obtain a laminated body, raising the temperature of said laminated body to a sintering temperature of said base material and said first cladding material, thereby resulting in mutual diffusion at the border between said materials, covering said thermally treated laminated body with a further metallic cladding material comprising aluminum substantially in a powdered state, binding by compaction under static fluid pressure said further cladding material with said first cladding material in order to obtain a multi-laminated body, and raising the temperature of said multi-laminated body to a sintering temperature of said first cladding material and said further cladding material.

Claim 24

A process for producing clad materials comprising, in sequential combination, covering a surface of a metallic base material comprising a nickel-base alloy with a first metallic cladding material comprising copper substantially in a powdery state, binding said first cladding material and said base material by compaction under static fluid pressure in order to obtain a laminated body, raising the temperature of said laminated body to a sintering temperature of said base material and said first cladding material, thereby resulting in mutual diffusion at the border between said materials, covering said thermally treated laminated body with a further metallic cladding material comprising aluminum substantially in a powdered state, binding by compaction under static fluid pressure said further cladding material with said first cladding material in order to obtain a multi-laminated body, and raising the temperature of said multi-laminated body to a sintering temperature of said first cladding material and said further cladding material.

Claim 25

A process for producing clad metals, comprising the steps of, in sequential combination, disposing a solid metallic base material within a surrounding resilient enclosure, filling the space between said base material and said enclosure with a powder comprising a cladding material, applying hydrostatic pressure to the exterior surface of said enclosure to compress said cladding material against said base material, thus binding said cladding material and said base material by compaction to form a laminated body, removing said resilient enclosure, and raising the temperature of said laminated body to a sintering temperature of said base material and cladding material, for a sufficient time to cause mutual diffusion at the border between said materials, combinations of said cladding material and base material being chosen from a member selected from the group consisting of nickel base alloy with copper, nickel base alloy with aluminum, steel containing carbon with copper, steel containing carbon with aluminum, aluminum with copper, Fe-Ni alloy with copper, magnesium with silver, type 2024 high-strength aluminum alloy with type 6053 corrosion-resistant aluminum alloy, type 5052 aluminum alloy with copper, copper-beryllium alloy with copper, austenite-type stainless steel with cupro-nickel, copper phosphate with silver, copper with nickel, copper with silver, and stainless steel with copper, the base material being the first-mentioned metallic material of each member of the group and the cladding material being the second-mentioned metallic material of each member of the group.

Claim 26

A process for producing clad metals, comprising the steps of, in sequential combination, disposing a solid metallic base material within a surrounding resilient enclosure, filling the space between said base material and said enclosure with a powder comprising a cladding material, applying hydrostatic pressure to the exterior surface of said enclosure to compress said cladding material against said base material, thus binding said cladding material and said base material by compaction to form a laminated body, removing said resilient enclosure, and raising the temperature of said laminated body to a sintering temperature of said base material and cladding material, for a sufficient time to cause mutual diffusion at the border between said materials, combinations of said cladding material and base material being chosen from a member selected from the group consisting of nickel base alloy with copper, nickel base alloy with aluminum, steel containing carbon with copper, steel containing carbon with aluminum, aluminum with copper, Fe-Ni alloy with copper, magnesium with silver, type 2024 high-strength aluminum alloy with type 6053 corrosion-resistant aluminum alloy, type 5052 aluminum alloy with copper, copper-beryllium alloy with copper, austenite-type stainless steel with cupro-nickel, copper phosphate with silver, copper with nickel, copper with silver, and stainless steel with copper, the base material being the first-mentioned metallic material of each member of the group and the cladding material being the second-mentioned metallic material of each member of the group.

Claim 27

A process for producing clad metals as claimed in claim 23, wherein said enclosure comprises a rubber tube, further comprising covering said rubber tube with a back-up metal pipe having an internal diameter substantially equal to the external diameter of said rubber tube, and removing said metal pipe after said cladding material fills said tube and before the step of sintering said cladding material and said base material.