Engineering practice

Question

Can the coating unit meet process pressure and repeatability, not only empty-chamber base pressure?

Parameters

example range: chamber V ≈ 600–1200 L; target high-vacuum range 10⁻⁵ mbar class before process; Ar/N₂/process gas through MFCs; turbo/cryopump configuration.

Known data

chamber volume, pump train, gauge positions, gas lines, source configuration, process gas flow.

Physical check

P(t), Q = V·dP/dt, S_eff at chamber, conductance from chamber to pumps, pressure under gas load.

Records

pump-down curve, pressure-rise test, helium leak report, gas-flow log, MFC calibration and FAT raw data.

Reject condition

ultimate pressure is given without pressure-time curve or pressure under process gas flow.

Conclusion

accept chamber / request gas-load test / request leak-outgassing split / revise FAT scope.

Vacuum Acceptance

Question

Can the boost-diffusion cycle be transferred to the target steel, load geometry and HPGQ route?

Parameters

typical review inputs: target effective case depth, surface-carbon criterion, austenitizing temperature window, gas pressure during high-pressure gas quench, load mass and fixture geometry.

Known data

steel grade, prior heat treatment, target case depth, boost/diffusion schedule, load mass and fixture.

Physical check

carbon diffusion kernel, boundary carbon flux, temperature uniformity, HPGQ cooling severity and distortion risk.

Records

carbon profile, hardness profile, microstructure, temperature log, quench data and distortion measurement.

Reject condition

recipe name is provided without measured carbon profile or hardness-depth testing.

Conclusion

accept recipe / correct boost-diffusion stages / request profile data / criterion route to tested load class.

LPC Testing

Question

Is the cathode validated for stable operation, or only shown to ignite once?

Parameters

example inputs: target current in mA–A range depending on test stage; Mo insert / emitter geometry; vacuum 10⁻⁵ Torr / mbar class before operation; gas flow and anode distance fixed for comparison.

Known data

emitter material, geometry, anode distance, thermal route, gas flow, pressure and target current.

Physical check

I-V curve, emission drift at fixed point, restart behaviour, gas/vacuum influence and post-test state.

Records

ignition trace, I-V data, ΔI/Δt, restart cycles, vacuum/gas log, thermal history and inspection.

Reject condition

single ignition event is presented as testing without drift, restart and environment records.

Conclusion

accept activation / request stability run / change thermal route / add contamination controls.

Cathode Testing

Question

Which coating or duplex route is suitable for a precision sliding pair under friction and wear constraints?

Parameters

typical inputs: sliding steel pair, tight dimensional tolerance, polished surface, lubricated or boundary-lubricated contact, coating thickness constrained by clearance.

Known data

substrate, hardness, counterbody, lubricant or medium, load, speed, tolerance and surface finish.

Physical check

support layer, coating thickness, interface quality, roughness change, friction curve and wear track.

Records

cross-section, roughness before/after, adhesion, hardness profile where relevant and tribology data.

Reject condition

coating appearance is shown without cross-section, roughness and friction-pair data.

Conclusion

select Avinit C/P or duplex route / request tribology test / change surface preparation.

Avinit Technical Depth

Question

Can the chamber support EP or cathode testing at operating gas load and diagnostic access conditions?

Parameters

example review case: xenon flow ≈ 0.3 mg/s; Ø1.2 m / 600 L-class chamber; cryopump/turbopump configuration; optical and electrical diagnostics through restricted ports.

Known data

chamber volume, pump train, xenon/process gas flow, diagnostic ports and test article geometry.

Physical check

P ≈ Q_gas / S_eff, conductance from test zone to pumps, contamination paths and diagnostic line of sight.

Records

gas-load pressure, effective pumping estimate, diagnostic layout, pressure logs and witness samples.

Reject condition

empty-chamber base pressure is used as proof of test readiness under xenon flow.

Conclusion

accept TVAC setup / add pumping or conductance changes / change diagnostic layout / add contamination control.

TVAC Depth

Question

Does the treatment form a useful support layer without damaging dimensions, roughness or phase condition?

Parameters

typical inputs: steel/alloy grade, low-temperature or conventional nitriding window, part tolerance, required layer depth and possible coating after nitriding.

Known data

material grade, heat treatment, part geometry, tolerance, required layer depth and coating-after-treatment plan.

Physical check

ion current, bias, gas chemistry, part temperature, layer depth, hardness gradient and roughness.

Records

bias/current log, temperature log, hardness profile, microstructure, roughness and dimensional check.

Reject condition

nitriding claim is given without profile, layer structure or dimensional-control data.

Conclusion

accept plasma route / adjust temperature-time-bias window / request duplex coupon testing.

Technical Models