2019-BTU-web-Vacuum-reflow-Dimock.pdf - 第20页

V acuum lev el % V oids @ 20 Sec hold time T orr Sec MLF100 MLF52 MLF16 760 0 38.54 27.81 20.37 500 20 26.08 120 20 6.7 4.1 2.4 45 20 4.2 2.1 1.3 20 20 3.35 1.24 1.14 6 20 1.86 1.86 0.75 > 10% < 10% < 3% 500 30 …

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Hold times % Voids @ 60 Torr
Torr Sec MLF100 MLF52 MLF16
760 0 38.54 27.81 20.37
60 10 9.3 4.2 3.0
60 20 8.0 3.4 1.7
60 30 6.1 2.6 2.5
60 40 6.2 2.5 2.2
20 5 7.3
20 10 3.65 2.49 1.18
20 20 3.35 1.24 1.14
20 30 1.93 0.72 1.04
20 40 1.99 1.13 0.66
> 10%
< 10%
< 3%
Hold times % Voids @ 20 Torr
Conclusions:
Vacuum level % Voids @ 20 Sec hold time
Torr Sec MLF100 MLF52 MLF16
760 0 38.54 27.81 20.37
500 20 26.08
120 20 6.7 4.1 2.4
45 20 4.2 2.1 1.3
20 20 3.35 1.24 1.14
6 20 1.86 1.86 0.75
> 10%
< 10%
< 3%
500 30 26.8
250 30 9.79 5.62 5.21
85 30 7.4 3.1 2.5
20 30 1.93 0.72 1.04
6 30 1.5 0.66 0.96
Vacuum level % Voids @ 30 Sec hold time
Conclusions:
Conclusions:
1. Nothing removes most of the empty spaces
from something
3. Vacuum levels as soft as 245 Torr and short as
5 seconds remove some of the empty spaces.
4. Hard vacuum of 20 Torr with a hold time of 30 seconds
results in void levels of about 2% in MFL 100s
2. It is easier to remove voids from small components
than large ones.