关键词: 金属网栅, 屏蔽效能, 透过率, 透明电磁屏蔽, 微尺度3D打印

Abstract: In order to implement the mass production of the large-area metal-mesh based transparent electromagnetic interference (EMI) shielding glass at low-cost and high throughput, a novel manufacturing method combining the electric-field-driven jet deposition micro-scale 3D printing and the nanosilver paste with a high silver content (80 wt.%) and high viscosity (up to 20000 mPa.s) is proposed. The influence of printing speed on the line width of metal-mesh, and the effects of the line width and the pitch of the printed metal-meshes on the optical transmittance and the electromagnetic shielding efficiency are revealed by a serial of experiments. Moreover, based on the proposed method and the optimized process parameters, three typical cases of the metal-mesh transparent EMI shielding glasses with area of 100 mm×100 mm and line width of 20 μm are fabricated. In addition, the adhesive force between the metal-meshes and the glass substrate are measured as 4B after sintering. The experimental results demonstrated, when the pitch of metal-meshes is 500 μm, the optical transmittance is 88% and the EMI shielding efficiency for the common medium-high frequency electromagnetic wave is greater than 26 dB; when the pitch of metal-meshes is 300 μm, the optical transmittance is 83% and the shielding efficiency for common medium-high frequency electromagnetic wave is higher than 30 dB; when the pitch of metal grids is 150 μm, the optical transmittance is 67% and the shielding efficiency for common medium-high frequency electromagnetic wave is higher than 37 dB. As a result, the proposed method based on the electric-field-driven jet deposition micro-scale 3D printing with the high content nanosilver paste provides a promising solution for mass producing large-area and high-performance metal mesh transparent EMI shielding glasses at low cost.

Key words: metal-mesh, micro-scale 3D printing, optical transmittance, shielding efficiency, transparent EMI shielding