SEM inspection and EDX analysis of oxidized Cu DC spark sample number 37 number 37 S. Heikkinen CERN EN/MME/MM S. Heikkinen CERN EN/MME/MM 3.3.2009
1 st oxidation 30 sparks 30 sparks 2 nd oxidation
cps cps 150 Cu Cu 1 st oxidation 100 80 30 sparks 30 sparks O element% = 3.51 O l % 3 51 O element% = 2.12 O l % 2 12 100 2 nd oxidation 60 40 50 cps 20 Cu Cu Cu O O 150 Cu Cu Cu Cu 0 0 2 2 4 4 6 6 8 8 10 10 2 4 6 8 10 Energy (keV) O element% = 1.27 Energy (keV) 100 50 Cu O Cu Cu 0 2 4 6 8 10 Energy (keV)
1 st oxidation 30 sparks 30 sparks 2 nd oxidation
cps Cu 150 cps 1 st oxidation 50 Cu 30 sparks 30 sparks O l O element% = 3.73 % 3 73 100 40 2 nd oxidation O element% = 0.89 30 cps 50 20 Cu Cu 150 O 10 Cu Cu Cu 0 2 2 4 4 6 6 8 8 10 10 Cu Cu Energy (keV) 0 O element% = 1.68 100 2 4 6 8 10 Energy (keV) 50 Cu O O Cu Cu C Cu 0 2 4 6 8 10 Energy (keV)
1 st oxidation 150 sparks 150 sparks 2 nd oxidation 180 sparks
cps cps Cu 150 Cu 1 st oxidation 150 O element% = 3.78 O element% = 0 95 O element% 0.95 150 sparks 150 sparks 100 2 nd oxidation 100 180 sparks 50 50 Cu O Cu Cu Cu O 0 Cu Cu 0 2 4 6 8 10 cps 2 4 6 8 10 Energy (keV) gy ( ) Energy (keV) Cu 150 O element% = 1.63 100 50 Cu O Cu Cu 0 2 4 6 8 10 Energy (keV) cps Cu 150 O element% = 0.30 100 50 Cu O Cu Cu 0 2 4 6 8 10 Energy (keV) 8
1 st oxidation 2 nd oxidation 2 nd oxidation 130 sparks
cps Cu cps 1 st oxidation 150 Cu 2 nd oxidation 2 nd oxidation O element% = 0 36 O element% 0.36 150 150 100 130 sparks O element% = 0.28 100 cps 50 Cu Cu 50 150 O element% = 1.49 O Cu Cu 0 Cu Cu 2 2 4 4 6 6 8 8 10 10 Energy (keV) O Cu Cu 100 0 2 4 6 8 10 Energy (keV) 50 Cu O Cu Cu 0 2 4 6 8 10 Energy (keV) Energy (keV) 9
2 nd oxidation ? oxidation ? 1 st oxidation 200 sparks 2 1 st oxidation 2 nd oxidation d 130 sparks
Conclusions : • Spark removes oxygen in the spot area plus in a halo around the spot. • After second oxidation the oxygen signal is higher in the halo than elsewhere.
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