Thursday, October 25, 2018, 10:36

Container is coated with TaC and wrapped with Ta heat-shield (3 layers)

Desired temp = 1900 C (expected TGHT ~445A/7.5V), TBHT will be set fixed at 230A (max).

Chamber is currently being pumped down

 Friday, October 26, 2018, 08:40

Pressure at IGP1 1.06e-6 Torr. 

Tapped up TGHT and TBHT manually to 40 A

Waited 1 hr for vacuum to stabilize.

IGP1 = 8.9e-6 Torr

Good vac at 3.00-5 Torr

Bad vac at 5.0e-5 Torr.

Initiating auto ramp for TGHT @ 1 A/min to a max setpoint of 350 A

Initiating auto ramp for TBHT @ 0.5 A/min to a max setpoint of 230 A

Once max setpoints achieved, will tap up manually to final desired temperature of 1900 C

 Friday, October 26, 2018, 10:46

At 62 A, the vacuum overpassed the "Bad vacuum " limit and the current reduced to 54 A.

when the pressure returned to the "Good vac" limit the ramping started automatically.

Friday, October 26, 2018, 16:59

TGHT= 450 A, Temperature = 1878 C

Ramping rate increased to 1A/min for the TBHT.

Tapped manually to 454 A, Temperature 1880 C.

Saturday, October 27 2018, 10:00 

Ramping down to 0 A @ 2 A/min.

Monday, October 29, 2018, 12:39

 Venting EVAP2, TaC coat sintering completed.