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Title: Sintered composite filter

A particulate filter medium formed of a sintered composite of 0.5 micron diameter quartz fibers and 2 micron diameter stainless steel fibers is described. Preferred composition is about 40 vol.% quartz and about 60 vol.% stainless steel fibers. The media is sintered at about 1100/sup 0/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/sup 0/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.
Authors:
Publication Date:
OSTI Identifier:
6557815
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Patent
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Research Org:
Lawrence Livermore National Lab., CA (USA)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; AIR FILTERS; COMPOSITE MATERIALS; EFFICIENCY; FABRICATION; FIBERS; FLUID FLOW; HIGH TEMPERATURE; HUMIDITY; PRESSURE EFFECTS; QUARTZ; SINTERING; STAINLESS STEELS; ALLOYS; CHALCOGENIDES; CHROMIUM ALLOYS; CORROSION RESISTANT ALLOYS; EQUIPMENT; FILTERS; IRON ALLOYS; IRON BASE ALLOYS; MATERIALS; MINERALS; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; POLLUTION CONTROL EQUIPMENT; SILICON COMPOUNDS; SILICON OXIDES; STEELS 420200* -- Engineering-- Facilities, Equipment, & Techniques