Sintered composite medium and filter

Patent · Thu Jan 01 00:00:00 EST 1987

OSTI ID:866338

Bergman, Werner ^[1]

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1. Pleasanton, CA

A particulate filter medium is formed of a sintered composite of 0.5 micron diameter quartz fibers and 2 micron diameter stainless steel fibers. A preferred composition is about 40 vol. % quartz and about 60 vol. % stainless steel fibers. The media is sintered at about 1100.degree. C. to bond the stainless steel fibers into a cage network which holds the quartz fibers. High filter efficiency and low flow resistance are provided by the smaller quartz fibers. High strength is provided by the stainless steel fibers. The resulting media has a high efficiency and low pressure drop similar to the standard HEPA media, with tensile strength at least four times greater, and a maximum operating temperature of about 550.degree. C. The invention also includes methods to form the composite media and a HEPA filter utilizing the composite media. The filter media can be used to filter particles in both liquids and gases.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4687579
• OSTI ID: 866338
• Country of Publication: United States
• Language: English

Related Subjects

sintered
composite
medium
filter
particulate
formed
micron
diameter
quartz
fibers
stainless
steel
preferred
composition
40
vol
60
media
1100
degree
bond
cage
network
holds
efficiency
flow
resistance
provided
strength
resulting
pressure
drop
similar
standard
hepa
tensile
times
maximum
operating
temperature
550
methods
form
utilizing
particles
liquids
gases
hepa filter
filter media
pressure drop
stainless steel
operating temperature
filter medium
tensile strength
preferred composition
particulate filter
sintered composite
quartz fiber
micron diameter
flow resistance
/210/55/376/428/