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Test Report of Yellowing Ceramic
The impact of yellowing ceramic  
Further to previous “Why Are There Yellowing Areas on DBC/DCB Substrate?”, we’d like to do more testing to see what the different between yellowing substrate and normal without yellowing. In addition to appearance, the biggest impact of performance is the product pressure resistance.

Pressure Resistance Test Results
Type
Q’ty
Press 60 sec
Max pressure value(KV)
Yellowing
10
OK
2.5
2.51
2.52
2.48
2.51
2.49
2.50
2.49
2.48
2.52
Normal
10
OK
2.51
2.48
2.52
2.48
2.52
2.50
2.51
2.48
2.52
2.51

The effect of ceramic surface color on Electric pressure.
The effect of ceramic surface color on Electric pressure 
Conclusion: There is no difference between them.

 Peel Force Comparison

Sample
Max Peel Force (N)
Min peel force (N)
Average Peel Force (N)
Average Peel of Strength (N/mm)
1
59.4000
51.4400
54.7600
10.9500
2
58.5900
49.3400
53.3300
10.6700
Average Value
59.0000
50.3900
54.0400
10.8100

Yellowing Ceramic

Peel force curve

Peel force curve

Ceramic without yellowing (normal)

Sample
Max Peel Force (N)
Min peel force (N)
Average Peel Force (N)
Average Peel of Strength (N/mm)
1
56.1000
44.2400
50.5000
10.1000
2
51.7000
41.1800
45.9700
9.1900
Average Value
53.9000
42.7100
48.2300
9.6500

Peel force curve

Peel force curve

Click here to download PDF revsion of "Test-report-of-ceramic-yellowing"

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