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Entry  Tuesday, May 26, 2015, 13:57, Laura Lambert, Endcaps, 40282-5, TARGET BOAT, In progress, Sintering TaC coating on Ta endcaps endcaps_-_may_26.jpg
    Reply  Wednesday, May 27, 2015, 17:58, John Wong, Endcaps, 40282-5, TARGET BOAT, In progress, Sintering TaC coating on Ta endcaps 
       Reply  Thursday, May 28, 2015, 10:23, Laura Lambert, Endcaps, 40282-5, TARGET BOAT, Problems, Sintering TaC coating on Ta endcaps - not fully sintered endcaps_-_round1_sintering_(1).jpgendcaps_-_round1_sintering_(2).jpg
Message ID: 198     Entry time: Wednesday, May 27, 2015, 17:58     In reply to: 197     Reply to this: 199
Author: John Wong 
Target Material: Endcaps 
Target Oven W.O#: 40282-5 
Source: TARGET BOAT 
Status: In progress 
Subject: Sintering TaC coating on Ta endcaps 

Laura Lambert wrote:

 Tuesday, May 26, 2015, 13:06

Endcaps were sprayed with TaC coating and let dry.

Each endcap is wrapped separately with a sheet of graphite foil and stacked in the target boat [see image]

The target boat is wrapped with 3-layers of Ta-heat shield.

The boat is installed in EVAP2, chamber is currently being pumped down.

 Wednesday, May 27, 2015, 08:50

HS water valves opened, no leaks detected.

Stepped up manually to 35A.

Initiated auto-ramp at 0.2A/min yesterday afternoon.

TGHT = 254A, 3.56V.

IGP1 = 5.9e-7 Torr.

Increasing ramping rate to 1.0A/min with a max setpoint of 400A.

 

 Wednesday, May 27, 2015, 17:51

TGHT has been at 400A for almost 6 hours.  Temp at 1500C.

Cooling down to 0A at 1A/min.

Chamber will be vented to inspect the caps. 

May have to remove the graphite foil wrapped on the caps and re-sintered the caps to 1800C.

 

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