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Catalyst working principle of sealed off co2 laser tube

Views:33     Author:Site Editor     Publish Time: 2019-11-24      Origin:Site


              The catalyst of the sealed off co2 laser tube can very effectively extend the service life of the co2 laser tube. During the high-pressure excitation of the CO2 laser tube, the service life of the co2 laser tube without catalyst was not more than 6000 hours, and the service life of the co2 laser tube coated with the catalyst  extended to more than 15,000 hours. Catalyst, effect and principle analysis of CO2 laser tube: Taking a high-voltage excitation CO2 laser tube as an example, the catalyst is also coated with a co2 laser tube on the outer edge of the plasma (which can also be considered as the inner wall of the discharge tube).

              Under the high-voltage electric excitation, the CO2 gas molecules in the discharge tube are continuously differentiated, and the CO2 dissociates into CO+O under the effect of electron collision. Fortunately, this reaction process is reversible, and CO and O will combine to generate CO2 after meeting. However, this combination of encounters is not complete, because the probability of their encountering recombination is less than the differentiation process of CO2.  What is more serious is that O2 is formed by the recombination of uncombined oxygen atoms, and the reaction activation ability of O2 and CO is very high, and it is difficult to form CO2. The O2 molecule is very active and can form oxides with other gas molecules in the equipment. Various oxides are very deadly for the CO2 laser tube, which can greatly reduce the output power of the CO2 laser tube. And the oxide accumulates to a certain extent, it will have a bad reaction, so that the power of the co2 laser tube disappears within a few hours. To put it mildly, after the CO2 laser tube is used for a certain period of time, the power does not decrease linearly, and suddenly it does not emit light.

                 According to the above analysis, the core solution is to accelerate the compounding of CO2 and reduce the oxidation function. Then you have to use the catalyst. The best way is to plate the catalyst on the discharge tube.The material of the catalyst can be classified into metals or rare earths. Metals include Pt, Au, Cu, etc., which can exert significant catalytic effects. However, one of the defects of metals is that they are all good conductors. The metal is directly plated in the discharge tube, and the current is directly conducted through the membrane layer, and does not pass through the working gas, so the discharge excitation cannot be discussed. The solution to this problem is to apply a metal oxide to the inner wall of the discharge tube. This solves the discharge problem well and achieves the catalytic purpose.


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