Vacuum pump

Thank you for all your answers.

Yes. I know 15 microns is not enough for CRT but I was planning using a getter of titanium or something to reach a bigger vaccum.

In the review of the VEVOR vacuum pump the guy don´t check the final vacuum, it´s a pity. Vevor sells in Spain a 2 stage vacuum pump that it suposed to get a 2 microns for less than 200$ but I think is not a very confiable brand. It is possible to get this vacum with that kind of vacuum pump?

Thank you

best regards
 
Titanium isn't a bad choice since it also will react with nitrogen. That's one of the reasons it is used as the working material in a sublimation pump. But you will need to valve off your roughing pump before using it (adding to the cost of your system). And you will need enough high-vacuum feedthroughs to operate the sublimation pump in addition to testing your CRT/etc.

Sublimation pumps often are used in combination with ion pumps (which are used to achieve very high vacuums) so it's not clear to me that the combination of a mechanical pump followed by a sublimation pump could get you to a good enough vacuum or not. That's because the high vacuum systems I've used had three types of vacuum pumps: A mechanical roughing pump, followed by a turbo pump (or DP), and finally an ion pump. Each one improves the vacuum by several orders of magnitude so "skipping steps" may not work out too well.

You will need to do some searching around to see what's been done in practical applications, there are many variations and tradeoffs to consider.
 
The cheap "bolt buster" induction heaters would probably flash a getter or heat a Titanium bit in a sealed off system without the need for a feedthrough.

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Thanks for your answers.

No no, I mean using titaniun as a getter but not in thee pump. really I don´t know what is a sublimatium pump.

like this guy in 1:05:20

He makes a CRT with a pump that gives around 15 microns and later using getters he goes to 1 micron. At least it is what he sais. The CTR works.

So to sumarize, It is difficult to get something below 10 microns with a 2 stage pump right?
 
Alberto-sp said:
So to sumarize, It is difficult to get something below 10 microns with a 2 stage pump right?
Click to expand...
That's an accurate assessment. There are some fundamental physical reasons why that's so, hence the need for different methods when you want a better vacuum.

I don't think there is much difference in the principles behind getters and sublimation pumps. The biggest difference is how they are activated.
 
homebrewed said:
That's an accurate assessment. There are some fundamental physical reasons why that's so, hence the need for different methods when you want a better vacuum.

I don't think there is much difference in the principles behind getters and sublimation pumps. The biggest difference is how they are activated.
Click to expand...

Thats is what I need. In vevor there is one supposed to get 3 micros for 200$ so now I know it is scamm. Thank you!
 
Done, I bought the Yellow jacket YJII. Thanks again for all your help.

As a complement I´m thinking in one of these vacuum chambers.



But working with vacuum, the risk of implosion scares me a bit. The transparent lid is made of acrylic. Has someone here experience with theses things? Are they safe?

Thank you
 
Alberto-sp said:
Done, I bought the Yellow jacket YJII. Thanks again for all your help.

As a complement I´m thinking in one of these vacuum chambers.



But working with vacuum, the risk of implosion scares me a bit. The transparent lid is made of acrylic. Has someone here experience with theses things? Are they safe?

Thank you
Click to expand...
Dudley does a review on this
 
The pot will contain most of the fragments if it fails. If you want to be sure, make your own cover from polycarbonate.

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