VACUUM PLATING OF REFRACTORY METALS,
Abstract
On the basis of the study of microstructure and michrohardness it is possible to conclude that in plating molybdenum with chrome-nickel alloys in the contact zone chemical formations practically will not be formed, although in the system molybdenum-nickel the formation of three chemical formations is possible and solubility of nickel in molybdenum at a temperature of rolling consists of 0.5%. A certain growth of microhardness in the contact zone is observed in plating of niobium with alloy EI602. Obviously, an increase of hardness here is stipulated at the expense of preferable diffusion of nickel into niobium (The Kirkendall Effect) in the contact zone a solid solution will be formed on the basis of a Ni3Nb compound, and a niobium and chrome compound. When plating niobium with zirconium or titanium, the increase in hardness is insignificant. A 2-hour soaking of molybdenum and niobium, plated with chrome-nickel alloys, has little influence on the structure and durability of cohesion. Soaking for 10 hours at the same temperature leads to increasing durability of the coating to 15-20%.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 07, 1963
- Accession Number
- AD0428554
Entities
People
- N. D. Tarasov
- R. A. Ul'yanov
- S. F. Kovtun
Organizations
- National Air and Space Intelligence Center