Online information source for semiconductor professionals

The effect of HCl permeaton through PFA on expected component life

Popular articles

New Product: Applied Materials new EUV reticle etch system provides nanometer-level accuracy - 19 September 2011

Oberai discusses Magma’s move into solar PV yield management space - 29 August 2008

‚??Velocity‚?? the new buzzword in Intel‚??s PQS annual awards - 12 April 2012

Applied Materials adds Jim Rogers to Board of Directors - 29 April 2008

TSMC honors suppliers at annual Supply Chain Management Forum - 03 December 2008

Don Grant & Debra Carrieri, CT Associated, Inc., Eden Prairie, Minnesota, USA  

ABSTRACT 

Metal and ceramic parts in components used in high purity liquid delivery systems are susceptible to attack by concentrated acids. If these parts are exposed to the acids they can be corroded and may result in premature failure of the part or contamination of the acid. An example of parts that are susceptible to acid attack are the magnets in the impellers in magnetically-levitated centrifugal pumps manufactured by Levitronix. In order to prevent attack, the magnets are encapsulated with a perfluoroalkoxy (PFA) coating to protect them from attack. However, if the acid gases permeate through the coating they can still attack the magnet in the impeller thereby causing premature failure of the pump and contamination of the acid. This study was undertaken to measure the permeation rate of HCl through the PFA used to encapsulate the magnets in Levitronix pump impellers as a function of the temperature and the concentration of hydrochloric acid to which the impeller is exposed.  

Download Please login to download the paper. No account yet? Please register. It's free!

Related articles

Intrinsic Birefringence in Crystalline Optical Materials for 193 nm and 157 nm Lithography - 01 December 2002

Important Aspects of DUV Optical Components - 01 June 2000

Praxair raises prices on tantalum - 11 September 2008

Xilinx to cut 7% of workforce - 05 June 2008

Second quarter IC sales to rise 4.9%, according to Gartner - 01 June 2009

Reader comments

No comments yet!

Post your comment

Name:
Email:
Please enter the word you see in the image below: