[Experience in plasma-detonation coating of the working parts of medical instruments with nickel-aluminide-based alloys].

The composition, the structure, and basic physical and mechanical properties of coatings composed of the nickel aluminide-based alloys HA-67, BKHA are examined. They are obtained by the detonation and plasma methods and by the combined detonation-plasma method as well. Because of the increased binder-base strength, a great and more uniform hardness, plasma-detonation coatings have been shown to be optimal as compared to the detonation and plasma methods.

[Change in the composition and structure of the metal in the zone of the welded seam of dental drill blanks].

Composition and structure of metals in the meld zone connecting a dental burr handpiece made of hard alloy BK-6 with a shank made of steel 20X13 are examined by the X-ary microanalyzer MS-46 and the X-ray diffractometer "dPOH-2". Representative interdiffusion processes of alloy components into steel and, converserly, iron from steel into hard alloy are found. After melding, the transition layer has been shown to represent the cobalt-iron solid solution with variable concentration of the components through the layer, tungsten carbid particles being uniformly spread all over the metallic matrix.