High-temperature, high-pressure bonding of nested tubular metallic components
- Kingston, TN
This invention is a tool for effecting high-temperature, high-compression bonding between the confronting faces of nested, tubular, metallic components. In a typical application, the tool is used to produce tubular target assemblies for irradiation in nuclear reactors or particle accelerators, the target assembly comprising a uranium foil and an aluminum-alloy substrate. The tool preferably is composed throughout of graphite. It comprises a tubular restraining member in which a mechanically expandable tubular core is mounted to form an annulus with the member. The components to be bonded are mounted in nested relation in the annulus. The expandable core is formed of individually movable, axially elongated segments whose outer faces cooperatively define a cylindrical pressing surface and whose inner faces cooperatively define two opposed, inwardly tapered, axial bores. Tapered rams extend respectively into the bores. The loaded tool is mounted in a conventional hot-press provided with evacuation means, heaters for maintaining its interior at bonding temperature, and hydraulic cylinders for maintaining a selected inwardly directed pressure on the tapered rams. With the hot-press evacuated and the loaded tool at the desired temperature, the cylinders are actuated to apply the selected pressure to the rams. The rams in turn expand the segmented core to maintain the nested components in compression against the restraining member. These conditions are maintained until the confronting faces of the nested components are joined in a continuous, uniform bond characterized by high thermal conductivity.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4231507
- OSTI ID:
- 863703
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
high-pressure
bonding
nested
tubular
metallic
components
tool
effecting
high-compression
confronting
typical
application
produce
target
assemblies
irradiation
nuclear
reactors
particle
accelerators
assembly
comprising
uranium
foil
aluminum-alloy
substrate
preferably
composed
throughout
graphite
comprises
restraining
mechanically
expandable
core
mounted
form
annulus
bonded
relation
formed
individually
movable
axially
elongated
segments
outer
cooperatively
define
cylindrical
pressing
surface
inner
opposed
inwardly
tapered
axial
bores
rams
extend
respectively
loaded
conventional
hot-press
provided
evacuation
means
heaters
maintaining
interior
temperature
hydraulic
cylinders
selected
directed
pressure
evacuated
desired
actuated
apply
expand
segmented
maintain
compression
conditions
maintained
joined
continuous
uniform
bond
characterized
thermal
conductivity
particle accelerators
particle accelerator
metallic components
nuclear reactors
thermal conductivity
nuclear reactor
assembly comprising
typical application
axially elongated
desired temperature
selected pressure
target assembly
bonding temperature
axial bore
mechanically expandable
metallic component
alloy substrate
hydraulic cylinders
inwardly directed
hydraulic cylinder
particle accelera
tubular metal
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