Vapor Deposition of Cobalt-tungsten Alloys.
Electrodeposition and Surface Treatment Elseview Sequoia S a Lausanne Switzerland 2:16 pages
Cobalt-tungsten binary deposits were formed in laboratory experiments by hydrogen reduction of the anhydrous mixed vapors of cobaltous chloride and tungsten hexachloride. The materials were sublimed in separately heated zones of a reaction tube and were transported in a stream of purified helium into the deposition section of the tube where the chloride gases were reduced to metal by a countercurrent flow of hydrogen. Heat-treating of the near stoichiometric binary metallic deposits converted nearly all to the intermetallic compound co3w; however, small quantities of both cobalt and tungsten remained. Mechanical tests showed that the tensile strength of heat-treated 75 pct cobalt-25 pct tungsten deposits was twice as high as that of similarly treated deposits of cobalt.
Electrodeposition and Surface Treatment, Elseview Sequoia S.a., Lausanne, Switzerland, V. 2