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Entry  Tuesday, September 17, 2013, 11:21, John Wong, Nb, target boat #3 (brand new!) , , , Nb thermo treatment (Bob's samples)  Nb_sample_setup.PNGNb_800C.PNG
    Reply  Thursday, September 19, 2013, 11:56, Laura Lambert, Nb, target boat #3 (brand new!) , , , Nb thermo treatment (Bob's samples)  Capture.PNG
       Reply  Thursday, September 19, 2013, 17:02, John Wong, Nb, target boat #3 (brand new!) , , , Nb thermo treatment (Bob's samples)  
    Reply  Friday, September 20, 2013, 14:59, John Wong, Nb, target boat #3 (brand new!) , , , Nb thermo treatment (Bob's samples)  
       Reply  Monday, September 23, 2013, 16:18, John Wong, Nb, target boat #3 (brand new!) , , , Nb thermo treatment (Bob's samples)  
Message ID: 89     Entry time: Monday, September 23, 2013, 16:18     In reply to: 88
Author: John Wong 
Target Material: Nb 
Target Oven W.O#: target boat #3 (brand new!)  
Source:  
Status:  
Subject: Nb thermo treatment (Bob's samples)  

John Wong wrote:

John Wong wrote:

Tuesday, September 17, 2013, 11:14

Target boat contains 5 Nb discs.  3 discs are wraps with 0.001" thin of Nb foil (99.8% pure), and 2 are wraps with 0.001" Ta foil (see attachment#1)

Chamber has been pumped down over night.  Pressure is currently at 9.8e-7 Torr. 

Heating instructions:

Samples will be heated up to 800C.  TGHT will be ramped up accordingly. (Two thermocouples are wielded on the target container.)

Once at the desired temperature; the samples will be heat for 4 hours before cooling down.

 Tuesday, September 17, 2013, 14:37

Target temperature has reached to 800C at around 13:00 (see attachment#2)

TGHT @ 230A/3.07V (local 233A/3.25V). 

IG @ 1.06e-6 Torr. 

The heater will be ramped down at ~17:00 at 2A/min.

 Tuesday, September 17, 2013, 17:36

Target temp: T1 = 805C, T2=797.6C

IG @ 9.4e-7 Torr.

Cooling down initiated. 

 Wednesday, September 18, 2013, 11:34

TGHT at 0A.  Temp at 22C. 

IG @ 5.8e-7 Torr.

Venting chamber.

 

 Friday, September 20, 2013, 14:56

Target contains batch#3 sample wrapped with Nb foil. 

Chamber has been pumped down to 1.03e-6 Torr. 

Samples will be heated up to 1200C for 4 hours.  

 Friday, September 20, 2013, 16:54

TGHT at 450A, temp stabilizes at 1238C.

Will cool down at 20:30 tonight.

Friday, September 20, 2013, 20:40  

Samples has been heated for 4 hours at 1235C.  

Cooling down initiated. 

 Monday, September 23, 2013, 14:40

Chamber was vented.

Batch#3 process completed.

 

 Monday, September 23, 2013, 16:14

Batch#4.  Target container contains 2 Nb stables (a bullet type and a disc).  

Samples are wrapped with "dimpled" Nb foil to prevent diffusion bonding. 

Chamber has been pumped down to 8.3e-7 Torr, CG1B @ 30mT, CG1A @ 118mT. 

Samples will be heated up to 1400C for 4 hours. 

Monday, September 23, 2013, 17:46

TGHT at 620A. Temp at 1400C. Current pressure @ 2.5e-6 Torr. 

Tuesday, September 24, 2013, 16:45

Sample#4 was heated up to 1400C and after about 3hrs, the target container started to break.

See the link below for more details:

https://www.dropbox.com/s/9mhpkz66u6yqldm/Nb_1400C.mp4

 

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