초록 ▼

A radome combines low dielectric constant and dissipation factor at microwave frequencies with mechanical strength and rigidity as well as resistance to ablation and rain erosion at hypersonic velocities in the range of Mach 4 to 6. Continuous filament glass fabric and/or strand is saturated with PT

A radome combines low dielectric constant and dissipation factor at microwave frequencies with mechanical strength and rigidity as well as resistance to ablation and rain erosion at hypersonic velocities in the range of Mach 4 to 6. Continuous filament glass fabric and/or strand is saturated with PTFE dispersion. Layers are applied to a mandrel and cold isostatically pressed. The pressed layer may be machined between applications and subsequent pressings. After all layers are applied and pressed, optionally including an outer ablation resistant random fiber reinforced PTFE composite, the densified structure is heat cycled above the crystalline melt point of the polymer to maximize mechanical properties.

대표청구항 ▼

A method for the production of bodies of complex shape, including the steps of: (a) saturating continuous strands of inorganic fiber material with fluorocarbon polymer material, the fluorocarbon polymer material being in the form of an aqueous dispersion; (b) drying the saturated fiber material to f

A method for the production of bodies of complex shape, including the steps of: (a) saturating continuous strands of inorganic fiber material with fluorocarbon polymer material, the fluorocarbon polymer material being in the form of an aqueous dispersion; (b) drying the saturated fiber material to form fiber material having fluorocarbon polymer particles interspersed among and coated onto the fibers; (c) forming a structural preform of a plurality of layers of the dried fiber material on a forming surface; (d) isostatically pressing the plurality of layers to form a rigid and densified composite of the layers; (e) machining said composite to a desired shape; (f) applying at least one more layer of saturated fiber material to said composite; (g) isostatically pressing to coalesce the polymer particles of said layer to said machined preform. (h) heating the assembly to an elevated temperature above the crystalline melt point of the fluorocarbon polymer material and maintaining said assembly at said elevated temperature for a predetermined period of time; and (i) cooling said assembly.