| 摘要 |
<p>A composite article (10) includes a matrix having first and second opposing surfaces (11, 12) defining a transverse dimension and a filler material embedded in the matrix. The filler material presents a density gradient in the transverse dimension wherein a minimum filler density is at the first surface (11). In one embodiment, the composite article (10) is a non-laminated article defining first and second regions (18, 20) wherein the first region (18) encompasses the first surface (11). The first region (18) has a filler-to-matrix ratio that varies along the transverse dimension, the filler-to-matrix ratio being at a minimum at the first surface (11). The first region (18) can include one or more additives. A method for forming a composite article (10) includes injecting first and second compositions into a die head (28) at different points so as to produce a partially mixed composition that is discharged from the die head (28). The second composition contains less filler material than the first composition.</p> |
