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AssigneeMaterial Sciences Corporation
InventorsBryan Joseph TULLIS, Karl D. KARLSON, Matthew MURPHY
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The teachings herein relate to sound damping materials and particularly to sound damping materials for castings. The sound damping material includes a surface layer including an elastomer and a filler. Preferably the filler includes glass or ceramic beads. The surface layer preferably has a textured surface for contacting with the casting. Preferably the filler has a diameter that provides or contributes to the textured surface. For example, a portion of the filler may have a diameter that is greater than the average thickness of the surface layer. The sound damping material includes one or more metallic layers, preferably for applying a force to a surface of the casting. The sound damping material preferably includes two metallic layers that are separated by a core polymeric layer.
A sound damping article for attaching to a casting comprising a multi-layer composite including:
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A sound damping article, wherein the sound damping article is formed of a composite material, the sound damping article is configured for attaching to a casting, the composite material includes a metallic layer (preferably two or more metallic layers) and a surface layer including an elastomer and glass or ceramic beads, wherein the sound damping article results in a reduction in the maximum value of the noise transfer function in the frequency range of 400 Hz to 800 Hz by about 10 dB or more at one or more of the following temperatures:
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Dependencies are inferred from the claim text.