Abstract: Methods and systems (20) are disclosed for making articles by three-dimensional printing. The methods include three-dimensionally printing articles by selectively jet-depositing a particle-bearing binder fluid (14) upon successive layers (4) of a build material powder (10) such that the particles (16) deposited with the binder fluid (14) increase the apparent density of the as-printed article. The particulate matter (16) of the binder fluid (12) is smaller than the mean particle size of the build material powder (10). Preferably, this jet-deposited particulate matter (16) has a mean particle size that is larger than about 1 to and smaller than or equal to 50 microns. The jet-deposited matter (16) acts to fill in the interparticle interstices of the build material powder (10) thereby simultaneously increasing the density of the printed article and improving its surface roughness and contour resolution, which in turn, improves the surface finish of the final article.

Abstract: An EMI shield having an EMI shielding effectiveness of greater than about 40 dB in the range of about 400 MHz to about 18 GHz is described. In some embodiments the EMI shield may exhibit a shielding effectiveness of at least about 60 db, and in other embodiment at least about 80 dB, in the range of about 400 MHz to about 8 GHz. The EMI shield may include at least two sections of rigid porous electrically conductive carbon joined together by an electrically conductive carbon containing adhesive. The rigid porous electrically conductive carbon may include electrically conductive carbon foam. The electrically conductive carbon containing adhesive may include electrically conductive carbon fibers in a polymer matrix.