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- 1650°C (3000°F) temperature, 10-5 vacuum or special
atmosphere, up to 15 tons (30,000 lbs.) of compacting force.
- Replaceable, interchangeable platens.
- General purpose high temperature heating facility suitable for heat
treating furnished parts after bonding.
The Vacuum Industries Diffusion Bonding Hot Press is a packaged system able
to press up to 6" diameter work-pieces to 15 tons force at temperatures
to 1650°C in high vacuum or controlled atmosphere.
Assemblies which must be joined by simultaneous application of high temperature,
high unit area squeeze and hard vacuums or inert atmosphere may be processed.
While designed primarily for pressure-diffusion bonding work the system may
be used as a general purpose high temperature facility by removing the press
platens and retracting the rams. A double acting ram, stationary ram platens
and cold wall furnace are contained in the horizontal stainless steel chamber.
The external press frame supports the chamber, vacuum pumping system and controls.
A saturable core reactor controlled power supply provides low voltage power through
water cooled bus to solid copper heating element electrodes. An air-powered
hydraulic system provides precisely controlled forces of high stability to insure
uniform pressing over extended periods.
Applications
When two parts are held in close contact and heated in a clean environment to a
temperature well below the softening point, diffusion bonding occurs. Solid state
diffusion of atoms across the interface produces a 100% metallurgical bond. The
process is superior to brazing because no lower melting metal is introduced and
superior to welding because no localized high stresses are produced, distortion is
eliminated, inaccessible surfaces can be joined. Used in aerospace frame and
engine manufacture, electronics and nuclear parts fabrication.
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Specifications
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Chamber
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Horizontal, 24" diameter x 24" long stainless steel interior 100%
jacketed with full opening, hinged door with clamps, supported by press frame
@ 42" CL elevation. Ports for power, rams, thermocouples, two
1 ½" shuttered sight glass
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Press & Frame
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Hydraulic press, double-acting with frame-mounted air-hydraulic power unit
with force/pressure regulator, reversing valve. Pressure gauges; ram high
and low, primary air. Pedestal and hydraulic rams are water-cooled, may be
withdrawn to clear furnace for general use. Stroke 5".
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Vacuum & Inert Gas System
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4" main valve air-operated failsafe closing; 4", 750 I/sec. diffusion
pump 15 CFM combination mechanical pump; welded steel manifolding, 1"
manual roughing and fore valves; connections for gauges and leak detector;
vacuum gauge control combination hot filament ionization and two-station
thermocouple, 1000 microns to 2 x 10-7 torr. Inert atmosphere system
includes 5 psig relief valve, 30"-0-15 psig Bourdon gauge, Ball valve for
gas inlet. Electrics include circuit breakers, pilot lamps, diffusion pump
cascaded with mechanical pump.
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Internal Mechanism
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Furnace cold wall, refractory metal rod elements and inner heat shields. Platens
6" diameter refractory metal flat face full engagement to 5" daylight
when full open, attached to water-cooled rams which act through sliding seals.
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Power Supply
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30 KVA, single phase saturable core reactor with linear power control and
magnetic amplifier, 10-turn digital potentiometer. Includes furnace volt
and current meters, cooling water flow interlock, shunt trip circuit breaker.
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Temperature Controls (optional)
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3-mode proportioning control with adjustable set point and strip chart
recorder with tungsten-rhenium thermocouple. Seperate indicating
over-temperature indicator cutout with thermocouple.
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Space and Service Requirements
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Floor
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7½' wide x 5½' deep x 7½' high
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Power
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480 volts, 3 phase, 60 hertz, 35 amps
120 volts, 1 phase, 60 hertz, 30 amps
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Water
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6 GPM @ 35 psig 80°F maximum
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Drain
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Open
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Air
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50 CFM maximum during pressing, 100 psig
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Performance
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Temperature
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3000°F maximum-uniformity ± 15°F
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Vacuum
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5 x 10-5 torr in 25 minutes, 10-6 torr range ultimate
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Press
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15 tons
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