Vacuum diffusion bonding of titanium sandwich panels for spacecraft
800 mm sandwich parts retain 92% base-metal strength after bonding; leak rate 1×10⁻⁹ Pa·m³/s; three sets delivered, including export to Europe.
The panel stack pairs 0.8 mm skins with laser-cut cores; after bonding there must be no unbonded areas and skin distortion must stay under 0.3 mm.
The JVDB-800 furnace offers an 800×800 mm equal-pressure chamber with ±2 ℃ uniformity, using staged loading up to 15 MPa and a three-hour diffusion cycle at 950 ℃.
Servo-hydraulic pressure closed loop plus displacement monitoring archive pressure, temperature and displacement curves for every cycle, meeting aerospace process-audit requirements.
Results
92% base-metal strength retained, sealing passed first time, lead time cut from 11 to 6 days, third-party European audit passed.
Batch vacuum brazing of aero-engine titanium blades
0.5 mm thin-wall TC4 blades, 0.05–0.1 mm gap, 240 parts per charge, 6 months of serial delivery with 99.2% first-pass yield.
Distortion control of high-strength steel parts by high-pressure gas quench
18CrNiMo parts quenched in 10 bar nitrogen instead of oil: hardness HRC 48–51 across the charge, distortion down from 0.45 mm to 0.12 mm.
Two-chamber vacuum furnace line for transmission gears
Two chambers alternate heating and cooling on a 42-minute cycle, 1.6 t per day, linked to loading robots for unmanned operation.
Export projectExport line for large cold-work tooling, vacuum oil quench
Cr12MoV blocks 180 mm thick, vacuum oil quenched with no scale or decarburisation, HRC 61–63; the furnace was exported with the tooling to Mexico.
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