The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 22, 1998
Filed:
Jun. 04, 1997
Robert A Petrisko, Gilbert, AZ (US);
Gary Lee Stark, Midland, MI (US);
Daniel R Petrak, Sanford, MI (US);
Richard E Jones, Midland, MI (US);
Northrop Grumman Corporation, Los Angeles, CA (US);
Abstract
Conductive and/or chemically absorptive ceramic fibers are woven with optional non-conductive/non-absorptive ceramic fibers to create a fiber reinforcement which is impregnated with a ceramic-material-producing (pre-ceramic polymer) binder and heated to create the ceramic honeycomb with controlled ohmic loss and/or chemical absorption properties. The desired properties of the honeycomb material can be provided by the conductive and/absorptive ceramic fibers alone or in combination with non-fibrous or fibrous conductive and/or absorptive ceramic material provided by the binder, typically a preceramic polymer which may or may not contain dispersed ceramic materials; after the honeycomb is formed, the non-fibrous or fibrous conductive and/or absorptive ceramic material is interspersed throughout the honeycomb. By heating the impregnated fiber reinforcement in the absence of oxygen, carbon from any carbon-containing materials within the binder remain as a part of the honeycomb material. The honeycomb can be loaded with additional carbon or carbon-containing fibers by repeating the loading and heating in the absence of oxygen steps. For applications requiring long-term thermo-oxidative resistance, refractory ceramics like pure silicon carbide can be substituted for the fibers or fillers employed.