Tuesday, May 01, 2018, 18:06

21 fibrous discs of nanoSiC are loaded into a tube container (coated/Sintered with TaC). 

Thermal treatment temperature at 1600C, TGHT is ~338A/5.5V, according to elog #407.

 Wednesday, May 02, 2018, 08:27

20 mins ago... initiate auto ramping at 0.2A to reach TGHT 250A.  Instead of ramping incrementally, TGHT jumped straight to 250A; vacuum shot up to milli torr.

Turn off TGHT immediately to let vacuum stable down to 10-6 Torr. 

System problem??  Archive striptool for more details. 

Re-activate auto-ramping - OK!

Once TGHT reached 250A (18 hours later from now), will continue ramping up to reach 1600C

 Friday, May 04, 2018, 01:09

TGHT just reach 250A, temp at about 1190C.  Pressure remained high at 4.2e-5 Torr. 

Continue autoramping to reach TGHT 300A.

 Friday, May 04, 2018, 11:07

TGHT at 300A for about 1.5 hr.  Temp at 1315C.  Pressure at 5.7e-6 Torr.

Autoramp to 320A.

 Friday, May 04, 2018, 14:39

Tapping up to 330A; temp at 1560C with slope changed to 1.05 (for carbide material). Will keep at this current/temp.

 Sunday, May 06, 2018, 13:25

TGHT at 330A/5.2V; holding temp at 1550C.  No coating on windows.  Pressure at 1.6e-7 Torr.

Cooling down at 2A/min. 

 Monday, May 07, 2018, 10:49

Evap cooled.  Venting chamber. 

Inspection of the discs next...

mass loss = 6.79 - 3.62 = 3.1 g (46%) [in agreement, good]