Abstract: A system and a method for densifying a porous preform are provided. The porous preform has a first surface and a second surface opposite to the first surface. A reflective layer is associated with at least one of the first surface or the second surface. A microwave source, under the control of one or more processors is configured to emit microwaves in at least one wavelength via a waveguide connected between the microwave source and a reactor into the porous preform either via the first surface or the second surface. The microwaves cause a temperature midway between the first surface and the second surface to be larger than the temperature at the first surface and the second surface by a value while at least one precursor gas flows in a chamber of the reactor. The reflective layer(s) has/have proprieties to cause the microwaves to have a phase shift of 180°.

Abstract: An additive manufacturing device utilizing an electron beam and laser integrated scanning comprises: a vacuum generating chamber (1); a worktable means having a forming region at least provided in the vacuum generating chamber (1); a powder supply means configured to supply a powder to the forming region; an electron-beam emission focusing and scanning means (6) and an laser-beam emission focusing and scanning means (7) configured in such a manner that a scanning range of the electron-beam emission focusing and scanning means (6) and a scanning range of the laser-beam emission focusing and scanning means (7) cover at least a part of the forming region; and a controller configured to control the electron-beam emission focusing and scanning means (6) and the laser-beam emission focusing and scanning means (7) to perform a powder integrated-scanning and forming treatment on the forming region.

Abstract: An additive manufacturing device utilizing an electron beam and laser integrated scanning comprises: a vacuum generating chamber (1); a worktable means having a forming region at least provided in the vacuum generating chamber (1); a powder supply means configured to supply a powder to the forming region; an electron-beam emission focusing and scanning means (6) and an laser-beam emission focusing and scanning means (7) configured in such a manner that a scanning range of the electron-beam emission focusing and scanning means (6) and a scanning range of the laser-beam emission focusing and scanning means (7) cover at least a part of the forming region; and a controller configured to control the electron-beam emission focusing and scanning means (6) and the laser-beam emission focusing and scanning means (7) to perform a powder integrated-scanning and forming treatment on the forming region.