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28 Feb

Posted at 11:36h in Ask an Expert
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For a chlorine system, or any other gas for that matter, a contaminated gas line will first be noticed in the regulator. Pressure begins to "creep" (increase in outlet pressure) as the regulator won't shut off. This is because moisture falls out of the gas at the pressure drop area, which on a regulator is through the seat, and corrosion starts to build on the poppet at the seat interference area, on the diaphragm and downstream of the seat. Unfortunately, just replacing the regulator won't help as your panel is contaminated. At this point you would have to rebuild your...

27 Feb

Posted at 12:33h in Ask an Expert
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The life expectancy of any corrosive gas system is a function of how clean you keep the gas.  Moisture is the enemy of most corrosive gases, and it doesn't take much to wipe out your system.  We've been reconditioning gas cabinets for 12 years now and have been around these systems for close to 30 years and we've seen systems that last a couple of weeks and others that are still running strong after 10 years. The difference between the two is how the systems are cared for. The key factors to maximize the life of your gas systems: Proper cycle purges Using...

27 Feb

Posted at 12:16h in Gas Delivery Systems FAQ
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Moisture, oxygen, or any molecular contamination are enemies to specialty gases, such as Silane (SiH4), Hydrogen Bromide (HBr), etc.   Keeping your gases clean will not only preserve your gas delivery system, but will also help maintain maximum yields on your process tool.     A well maintained gas cabinet will last for many years -- conversely, a contaminated gas line can ruin a system instantly, and be a costly mistake. Most contamination occurs during cylinder change-outs.  Here are the critical pieces to maintaining a clean system when changing out your gas bottles: 1.  Proper Cycle Purge Make sure to adequately cycle purge your gas cabinet...

24 Jan

Posted at 10:35h in Ask an Expert
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If your flow is actually low and you can see that by the front flow meter, then you have to determine if it is in the lower section, or the Delatech itself. First, disconnect the line from the pump that is going up into the cabinet, and run a temporary line to the tank.  Hold the line in the tank and start the pump.  What is the flow?    If it is back to normal, then you know your pump and bottom filter are OK. If it is still low, it is either your Y filter or your pump.  If it is...

23 Jan

Posted at 15:33h in Ask an Expert
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[Full question here]  "We have a team welding 6 inch OD 316L tubing with a .109 wall thickness.   Using the AMI 207 with their 7500 weld head and water cool, they are experiencing excessive heat such that production is being slowed to only 5-6 welds per day.   Can you suggest some methods to help cool the head better, or some other method to speed production without having to coupon in each time?" [Answer]  You should definitely be getting more than 5-6 welds per day on a coupon.  If it’s burning up the tungsten after 5-6 welds, then it may...

13 Dec

Posted at 11:33h in Industry Advancements
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Many researchers and manufacturers have pegged organic solar cells as the future for the solar industry because the manufacturing process entails the use of flexible and cheap polymers. Scientists from the University of Warwick Department of Chemistry have published a new study in the journal Advanced Materials. The paper covers the details of their discovery that fullerene, one of the main components required to fabricate organic solar cells, has another property—electrons accepting states. These finding help researchers to create a new category of fullerenes called “fullerene mimics.” Fullerene mimics have has similar characteristics to fullerene. Attributes of Fullerenes Fullerene refers to a third...

07 Dec

Posted at 18:23h in Ask an Expert
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The answer here is yes and no. Successfully reconditioning a gas panel, or in this case a gas cabinet, for use in another gas requires certain measures to be taken to assure that the new gas isn't effected by what was run in the cabinet previously. Residual gas that remains trapped in minute crevices and elastomers (regulator and valve seats for example), can react with the new gas and cause corrosion and other forms of contamination. CSI has over 12 years of successfully reconditioning gas systems and our research has shown that if we recondition a gas panel and then...

06 Dec

Posted at 14:33h in Industry Advancements
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A team of researchers made up of scientists, engineers, and chemists from around the global has created ground-breaking technology that combines silicon-based optical fibers with solar cells. The makes it a near reality to integrating solar-cell silicon fibers to produce bendable, curved or twisted solar fabric. The researchers also demonstrated that it could scale the material to multiple meters in length. Professor John Badding, a Penn State chemistry professor who led the team, posted the information in the online journal of Advanced Materials on December 6. The paper will also appear in a future hard-copy edition of the journal. First Optical Fiber...

06 Dec

Posted at 06:00h in Industry Advancements
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Field effect transistors marked a significant turning point for the modern electronics industry. For many years, manufacturers built semiconductors with silicon and gallium arsenide. Companies eventually replaced these semiconductor materials with amorphous silicon (a-silicon or a-Si), which makes up the primary material used to fabricate the thin film transistors (TFT) used in liquid crystal displays. TFT consists of field effect transistors that are layers of thin film deposited on a glass substrate.  The lack of a crystal structure allows display manufacturers to employ the vapor-deposition process to apply thin-film transistors onto large substrates.  Manufacturers use TFTs in the fabrication of popular...