Thursday, June 11, 2020, 09:56

Previous day (Wednesday June 10, 2020) 

Container coated with TaC and wrapped with 3 Ta heat shields.

Desired temperature= 1900 C, Omega Slope set = 0.990, Auto TGHT at 0.2A/min to reach 400A, TGHT will be tapped up accordingly to reach desired Temp.

TBHT will be set fixed at 230 A (max).

Good vac at 3.00e -5 Torr

Bad vac at 5.00e-5 Torr

Chamber pump down

Thursday, June 11, 2020, 10:19

IEVAP2:IGP1=1.06e-6 Torr

ramping to 40A (TGHT and TBHT) at 1A/min

Thursday, June 11, 2020, 12:35

IEVAP2:IGP1=1.8e-6 Torr

TGHT = 39.8 A, 0.45V

TBHT=38.5 A, 0.48V

Manually rampted to 45A on both TGHT and TBHT 

Thursday, June 11, 2020, 12:58

IEVAP2:IGP1=1.6e-6 Torr

TGHT = 34.8 A, 0.52V

TBHT=44.2A, 0.55V 

Start Autoramp at .5A/min to 400A on TGHT and 230A on TBHT

Thursday, June 11, 2020, 17:14

Irregular pressure profile.  Cooling .  Need to check for leak.

TGHT = 99 A 1.3 V

TBHT = 99 A 1.4 V

Friday, June 12, 2020, 12:59

Restarting ramping

IGP1= 4.98e7 Torr

Autoramp at 1A/min to 400A on TGHT and 230A on TBHT

(pressure and TGHT current and voltage profile seem normal compared to previous coating sintering with the same power supply)

Friday, June 12, 2020, 14:40

Paused ramping

TGHT = 90A

After a few minutes the profile (noise) was still there.  Continue autoramp at 0.5A/min to 400 A on TGHT and 230A on TBHT

Friday, June 12, 2020, 15:21

IGP1= 1.97e-06 Torr trending down

TGHT = 111.5 A , 1.5 V

TBHT = 112.9 A, 1.9 V

Increase ramping speed to 1A/min to 400A on TGHT and 230A on TBHT

Friday, June 12, 2020, 20:50

OMEGA = 1754 C

IGP1= 2.5e-6 Torr

TGHT = 394.1 A, 6.6 V

TBHT = 232.8 A, 4.0 V 

Tapping to 1900 C

Friday, June 12, 2020, 21:00

OMEGA =1901 C

IGP1= 5.6e-6 Torr

TGHT = 448.3 A, 7.5 V

TBHT = 232.8 A, 4.1 V

Saturday, June 13, 2020, 00:51 

 OMEGA = 1898 C

IGP1 = 2.0e-6 Torr

TGHT = 447.2 A, 7.5 V

TBHT = 232.9 A, 4.1 V

Start cooling at -2A/ min for TGHT and -1A/min for TBHT