MSD displaying use of diffusion bonded construct
Monocrystal was a type of starship construction material that could be joined with other materials via diffusion bonding.
The comp of the 22nd century Klingon D5 class battle cruiser was of diffusion bonded monocrystal. (ENT: "Judgment")
The inner layer of an Intrepid-class' warp coils were made from verterium cortenide, a densified composite material consisting of polysilicate verterium and monocrystal cortenum. (VOY: "Investigations")