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Entry  Thursday, May 19, 2016, 14:38, John Wong, SiC, , TARGET BOAT, In progress, Heat-treatment: Beta-SiC (1um) target discs  
    Reply  Friday, May 20, 2016, 08:54, Laura Lambert, SiC, , TARGET BOAT, In progress, Heat-treatment: Beta-SiC (1um) target discs  
       Reply  Tuesday, May 24, 2016, 11:18, John Wong, SiC, , TARGET BOAT, In progress, Heat-treatment: Beta-SiC (1um) target discs  
Message ID: 297     Entry time: Thursday, May 19, 2016, 14:38     Reply to this: 298
Author: John Wong 
Target Material: SiC 
Target Oven W.O#:  
Source: TARGET BOAT 
Status: In progress 
Subject: Heat-treatment: Beta-SiC (1um) target discs  

The purpose of this experiment is to determined the limiting operating temperature for Beta-SiC.  To do so, samples will be heated in sequence to observe any volatile Si coated on the window.  The coating is observed above 1400C for the conventional SiC (mixuture of alpha and beta) and this coating leads to HV shorting problem. 

Thursday, May 19, 2016, 14:26

Beta-SiC (size ~1um) slurry was prepared and casted on a graphite foil. 

Discs are cut into D-shape

Average thickness (including graphite foil) = 0.349mm

Graphite foil = 0.13mm

Actual SiC thickness = 0.219mm (close to normal SiC thickness)

Samples are loaded into a target boat.

Total discs = 120

Total mass = 14.3507g

Thursday, May 19, 2016, 14:32

Omega slope set to = 1.04

Heat-treatment #1: 1400C

 Thursday, May 19, 2016, 17:04

TGHT ramping up to 250A at 0.5A/min

 

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