Accession Number : ADA198127

Title :   Compaction Study of Conductive Polyether-Etherketone (PEEK) and Nickel Powder Composites.

Descriptive Note : Final rept. Aug 87-Mar 88,

Corporate Author : NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIR VEHICLE AND CREW SYSTEMS TECHN OLOGY DEPT

Personal Author(s) : Reilly, J. J. ; Kamel, I. L.

Report Date : JUN 1988

Pagination or Media Count : 56

Abstract : Considerable interest has developed in utilizing thermoplastic matrices in composites for engineering applications, particularly in the aerospace industry. Much of this interest has been directed toward the development of high performance thermoplastic composites with continuous fiber reinforcements. Polyether-etherketone (PEEK) is a viable candidate for many of these applications. This study deals with the cold compaction of polyether-etherketone (PEEK) and nickel powder blends. Four different types of PEEK powders were utilized for this investigation. These PEEK powders included fine and coarse size powders of a low viscosity grade (150PF and 150P) and similar powders of a high viscosity grade (450PF and 450P). Each of the four different PEEK powders were blended with about 10 volume percent of nickel powder (Novamet) using a dry mixing technique. These PEEK/nickel powder blends were then successfully compacted at room temperature. Green strengths as high as 39.5 MPa and 26.3 MPa were measured on nickel filled 150 grade and 450 grade compacts, respectively. These higher strength values of the nickel filled compacts compared to their respective unfilled ones were attributed to a higher degree of mechanical interlocking and plastic deformation, which was induced in the polymer particles during compaction by the hard nickel filler. These composites also exhibited lower viscoelastic recoveries than their respective unfilled compacts. Electrical resistivities as low as 0.06 ohm-cm were achieved by compacting 150p/nickel powder blends. This resistivity value agreed well with the calculated value predicted from the literature. Keywords: Electrically conductive composites, Segregated network. (aw)

Descriptors :   *COMPACTING, *COMPOSITE MATERIALS, *THERMOPLASTIC RESINS, AEROSPACE INDUSTRY, ELECTRICAL CONDUCTIVITY, ELECTRICAL RESISTANCE, FIBER REINFORCED COMPOSITES, FILLERS, HIGH VISCOSITY, LOW LEVEL, MIXTURES, NICKEL, PARTICLES, POWDERS, RECOVERY, ROOM TEMPERATURE, VISCOELASTICITY, VISCOSITY.

Subject Categories : Laminates and Composite Materials
      Plastics
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE