Le pauvre résistance de vide argent placage film (film faiblesse) est principalement manifesté comme:

Le pauvre résistance de vide argent placage film (film faiblesse) est principalement manifesté comme:

① Wipe or tear with special tape, resulting in pieces falling off;

② Wipe or tear with special tape, resulting in point-like shedding;

③ After boiling for 15 minutes, use special tape to pull and tear to produce dots or flakes;

④ Frottement avec a spécial caoutchouc tête et 1Kg force pour 40 fois, là volonté être a chemin;

⑤ Quand le film est effacé ou not effacé, fissures et maillage fine lignes apparaîtent.

Microstructure of vacuum silver-plated film

Le optique propriétés de mince films, tel as réfractive index, absorption et laser dommages seuil, principalement dépendent de la microstructure de la film couche. Film matériau, résiduel gaz pression, et substrat température can all affect la microstructure du film. Si le évaporation déposé atomes ont faible mobilité sur le substrat surface, le film contiendra micropores. Quand le film est exposé à humide air, ces pores sont progressivement remplis avec eau vapeur.

Packing density is defined as the ratio of the volume of the solid portion of the film to the total volume of the film, including voids and pores. For optical films, the packing density is usually {{0}}.75 to 1.0, mostly 0.85 to 0.95, and rarely reaches 1.0. Packing densities less than 1 cause the refractive index of the evaporated material to be lower than that of its bulk. During deposition, the thickness of each layer is monitored by an optical or quartz crystal. Both techniques have their own advantages and disadvantages, which are not discussed here. What they have in common is that they are all used in a vacuum when the material is evaporated, so the refractive index is the refractive index of the evaporated material in vacuum, not the refractive index of the material exposed to moist air. The moisture absorbed by the film replaces the pores and voids, causing the refractive index of the film to increase. Since the physical thickness of the film remains constant, this increase in refractive index is accompanied by a corresponding increase in optical thickness, which in turn causes a shift in the spectral properties of the film toward longer wavelengths. To reduce this spectral shift caused by the volume and number of micropores within the film layer, energetic ions are employed to transfer their momentum to the evaporating material atoms, thereby greatly increasing the mobility of the material atoms during condensation at the substrate surface .