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TOPIC: Glass vs. Stainless Steel for Cell
#464
11 years 8 months ago
Glass vs. Stainless Steel for Cell
I have read that Cellani's reason for specifying glass, rather than stainless steel, is that the latter contains significant amounts of sulfur. The amount of sulfur in stainless depends on its formulation, with low impurity such types as 304L having up to 300 ppm. What is not clear to me is whether the amount of sulfur that would outgas from 304L is sufficient to affect the LENR effects.
I found a paper by CERN which concluded that vacuum baking 304L would remove sulfur and permit extremely high (10E-12) vacuum to be achieved. The paper did not indicate at what SS temperature this vacuum was achieved.
An all stainless cell has numerous advantages, the most important being the ability to operate up to >500C and no need to deal with tempco mismatch. It also permits the use of Conflat hardware and VCR fittings, both of which feature metal-metal seals capable of supporting vacuum or pressure at elevated temperatures. Even if if the SS does outgas sulfur, it is possible to capture SO2, H2S with something like Zinc Oxide. This so called sulfur getter is widely used in gas purification.
Does anyone have any data on the amount of sulfur compounds that actually do leach from stainless at elevated temperatures, and has anyone demonstrated that such levels actually impar LENR activity?
Jeff
I found a paper by CERN which concluded that vacuum baking 304L would remove sulfur and permit extremely high (10E-12) vacuum to be achieved. The paper did not indicate at what SS temperature this vacuum was achieved.
An all stainless cell has numerous advantages, the most important being the ability to operate up to >500C and no need to deal with tempco mismatch. It also permits the use of Conflat hardware and VCR fittings, both of which feature metal-metal seals capable of supporting vacuum or pressure at elevated temperatures. Even if if the SS does outgas sulfur, it is possible to capture SO2, H2S with something like Zinc Oxide. This so called sulfur getter is widely used in gas purification.
Does anyone have any data on the amount of sulfur compounds that actually do leach from stainless at elevated temperatures, and has anyone demonstrated that such levels actually impar LENR activity?
Jeff
#465
11 years 8 months ago
Glass vs. Stainless Steel for Cell
You are right about Celani's warnings on sulphur.
The stainless for the EU Dual Glass/Steel cells has been chosen for its low sulphur content and it will be baked with vacuum additionally as our other cells are to minimise active run out-gassing.
We also would like more detailed answers to the questions you raise, so if anyone has time to explore these, or knows the answers - your help is appreciated.
B
The stainless for the EU Dual Glass/Steel cells has been chosen for its low sulphur content and it will be baked with vacuum additionally as our other cells are to minimise active run out-gassing.
We also would like more detailed answers to the questions you raise, so if anyone has time to explore these, or knows the answers - your help is appreciated.
B
#467
11 years 8 months ago
Glass vs. Stainless Steel for Cell
The stainless cell should be baked in a hydrogen plasma. 800 volts on an electrode with <1 torr of hydrogen at 300-500 C for 12 hours will clean out all the virtual vacuum sources in glass or stainless. The voltage generates a plasma in the vacuum chamber. The atomic hydrogen reacts with everything. It is a great way to clean the chamber - even removes all of the carbon and water.
jdk
jdk