LiF-film-assisted diffusion bonding of MgF2 ceramics

The dependency of optical properties on density for hot pressed MgF2

“…It is of considerable interest to separate these scattering components and to find their dependency on the grain size and the total volume and size of the pores [13][14][15]. High transparency in infrared wavelengths could be obtained by increasing the density and eliminating the porosity which is the main cause of scattering.…”

Deformation behavior and joining of a MgF2 optical ceramic

“…5 Diffusion bonding entailed applying a thin film of LiF on the mating surfaces of the pieces being joined and maintaining a constant compressive stress for >3 h at 550-575 • C. Without any interlayer, diffusion bonding was accomplished by applying constant pressure at 800-830 • C for about 6 h 4 . Limitations of this process are two-fold: (a) long hold times at elevated temperatures which can result in grain growth and (b) use of an extraneous interface material.…”