 |
| Powered by phpBay Pro |
Uses Of Vacuum Chambers And Pumps
A vacuum chamber is a rigid enclosure from which air and other gases are removed by a vacuum pump. The resulting low pressure, commonly referred to as a vacuum, allows researchers to conduct physical experiments or to test mechanical devices which must operate in a vacuum. Chambers made of aluminum allow one to control the magnetic field inside from outside the vacuum. Conversely, chambers made of mu-metal prevent external fields from entering the vacuum.
Vacuum chambers are necessary to impede the contamination of samples in varied range of applications in spectroscopy and for film depositions. These types of applications are typically employed in the semi-conductor industry where avoiding contamination of specimens is of the utmost importance. As referenced previously, vacuum chambers produce an environment that is conducive to testing devices that must operate in the vacuum that exists in outer space. Numerous models of vacuum chambers are made of aluminum, due to the fact that it does not have any magnetic properties.
Most vacuum chambers are made with ports that allow for instruments to be installed in the walls of the chamber. In low to medium-vacuum applications, these are sealed with rubber o-rings. In ultra high vacuum processes, the flanges are made of hardened steel and welded into place against copper gaskets.
For outer space applications, thermal vacuum chambers are utilized, because the emulate a thermal environment that is present in space. These applications also utilize very advanced vacuum pumps
Vacuum chambers are frequently used when mixing resins and silicone rubbers. A vacuum chamber is needed when manufacturing resins and silicone rubber to insure that the mold is free of air bubbles. In order to prevent air bubbles, material are placed in a vacuum chamber while they set. The casting or molding material is mixed according to the manufacturers directions. Since this type of material will expand to as much as 4 times its original volume, the vacuum container must be large enough to accommodate this volume expansion. If not, there will insufficient volume to complete the process. The material container is then placed into the vacuum chamber; a vacuum pump is connected and turned on. After the vacuum gets to 982 mbar, the material will start to rise. . After the material reaches its full volume it will stabilize and not rise any further. The vacuuming is continued for another three minutes to make certain all of the air has been removed from the material. After this interval is attained, the vacuum is terminated and the pressure is allowed to equalize with the ambient pressure. At this point the vacuum chamber is opened and the substrate is removed and put into a mold.
Consequently, vacuum chambers used in semi-conductor manufacturing involve processes that are very complex. Since extremely high levels of purity are needed to avoid semi-conductor device contamination, these semi-conductor substrates are produced in ultra high vacuums. As semi-conductor devices have packed increasingly dense circuitry into smaller and smaller silicon real estate, the need for ever increasing vacuum levels has also risen. Therefore, highly advanced ultra high vacuum chambers are used in space research and semi-conductor manufacturing processes. In the manufacture of semi-conductor devices, where particles that are several nanometers in width can contaminate a specimen, ultra high vacuums are employed.
|
 VAT 02008 AE44 Wafer Transfer Vacuum Valve Surplus New  US $6,000.00
|
 VAT 0200X BE24 Transfer Vacuum Valve Surplus New US $5,000.00
|
 TorrVac SVL 202AC Stainless Steel Vacuum Gate Valve US $5,000.00
|
 Granville Phillips Gold Seal 6 Vacuum Gate Valve Air US $4,995.00
|
 HVA High vacuum Apparatus 22242 0213M Steel Valve R US $4,865.99
|
 VAT 65148 PACW Vacuum Pendulum Valve Rebuilt US $4,800.00
|
 VAT 64250 UE52 Vacuum Gate Valve Rebuilt Helium Tested US $4,800.00
|
 VAT Stainless Vacuum Gate Valve 02112 AE AAJ1 0003 R US $4,499.99
|
 HVA High Vacuum 10 Gate Valve 11211 1000K NEW US $4,388.00
|
 HVA High Vacuum Apparatus 6 x 145 Slit Valve US $4,089.99 |
 VAT 64248 UE52 12 CF Vacuum Gate Valve Surplus New US $4,000.00
|
 VAT 64048 UE52 12 CF Vacuum Gate Valve Surplus New US $3,800.00
|
 VAT 64248 PE52 ISO 250 Vacuum Throttle Gate Valve US $3,800.00
|
 VAT 02112 BA24 AJY1 0057 Vacuum Gate Valve A 312531 US $3,629.99
|
 VAT 0200X BA24 Transfer Vacuum Valve Surplus New US $3,500.00
|
 VAT 64250 TE52 10 ASA Gate Vacuum Valve Surplus New US $3,400.00
|
 VAT 14046 UE24 10 OD Conflat Vacuum Gate Valve Surplus New US $3,300.00
|
 VAT 02012 AA44 0001 Transfer Vacuum Valve US $3,250.00
|
 VAT 02109 BA24 Wafer Transfer Vacuum Valve Rebuilt US $3,150.00
|
 VAT 02010 AA24 Wafer Transfer Vacuum Valve US $3,000.00
|
 VAT Large Pendulum Gate Pneumatic Vacuum Valve 65044 PACW AWI1 0004 US $2,999.99
|
 HVA High Vacuum Apparatus 422 1582 Gate Valve Varian US $2,999.95
|
 TURBO VACUUM VALVE IDX Yokogawa 25 ORIX FAN Omron US $2,999.00
|
 VAT Vacuum Gate Valve 10846 CE24 0005 0990 New US $2,995.00
|
 VAT 14046 PE44 Vacuum Gate Valve ISO 200 Rebuilt US $2,750.00
|
 VAT 6 ASA Vacuum Gate Valve Rebuilt US $2,750.00
|
 VAT 10846 UE24 10 Conflat Vacuum Gate Valve Surplus New US $2,700.00
|
 VAT 64246 CE52 10 Conflat Vacuum Gate Valve Surplus New US $2,700.00
|
 VAT 10846 TE44 6 ASA Vacuum Gate Valve Rebuilt US $2,700.00
|
 VAT 16546 PA21 Pendulum Vacuum Valve Rebuilt He Tested US $2,700.00
|
 MDC GV 10000V ASA P 10 ASA Vacuum Gate Valve PN 305006 Rebuilt US $2,600.00
|
 VAT 16546 PA21 AAE1 Vacuum Pendulum Valve Rebuilt US $2,600.00
|
 Granville Phillips Gold Seal 6 Vacuum Gate Valve NOS US $2,600.00
|
 TOKYO SOUND Valve300SE Vacuum Tube Amplifier US $2,545.00
|
 VAT 12148 PE24 ISO 250 Vacuum Gate Valve Surplus New US $2,500.00
|
 VAT 02010 BA24 Wafer Transfer Vacuum Valve US $2,500.00
|
 VAT 0410X BH44 Wafer Transfer Vacuum Valve US $2,500.00
|
 VAT 02110 BE44 Transfer Vacuum Valve US $2,500.00
|
 VAT 14046 PE44 1016 6 ASA Vacuum Gate Valve Rebuilt US $2,500.00
|
 VRC Vacuum Gate Valve LPWA6ASAN120BEPFC115 6ASA NEW US $2,500.00
|
 VAT 65044 PACW AVW1 Vacuum Pendulum Gate Valve A 766873 US $2,499.99
|
 VAT 12146 PA24 0001 0090 VACUUM GATE VALVE 8 INCH US $2,399.99
|
 NEW BOC EDWARDS VACUUM GATE VALVE MODEL NGW414000 US $2,374.99
|
 VAT 0340X BA24 Wafer Transfer Vacuum Valve US $2,350.00
|
 VAT 02009 BA44 Wafer Transfer Vacuum Valve US $2,350.00
|
 HVA 11212 9801R 6 ASA Vacuum Gate Valve Rebuilt US $2,300.00
|
 VAT Stainless Vacuum Gate Valve 03110 NE24 1001 0029 R US $2,299.99
|
 VAT Stainless Vacuum Gate Valve 03110 NE24 1001 0027 R US $2,299.99
|
 VAT Stainless Vacuum Gate Valve 03110 NE24 1001 0028 R US $2,299.99
|
 VAT 02010 BA44 Transfer Vacuum Valve US $2,250.00
|
 VAT 02010 BE44 Transfer Vacuum Valve US $2,250.00
|
 VAT 65044 PACW Vacuum Pendulum Valve Rebuilt ISO 160 US $2,000.00
|
 VRC Vacuum Gate Valve LP6ASAN620BEP 6ASA Air Operator US $2,000.00
|
| Powered by phpBay Pro |