Accession Number : AD0701547

Title :   THE MECHANISM OF JOINT FORMATION IN SOLID-STATE WELDING OF ALUMINUM OXIDE CERAMICS WITH NIOBIUM (O Mekhanizme Obrazovaniya Soedineniya pri Svarke v Tverdom Sostoyanii Keramiki iz Okisi Alyuminiya s Niobiem),

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Karakozov,E. S. ; Kotelkin ,A. S. ; Matveev,G. M. ; Merkulov,V. A. ; Shorshorov,M. Kh.

Report Date : 17 FEB 1970

Pagination or Media Count : 14

Abstract : The kinetics of the process of joint formation in solid-state welding of Al2O3 ceramic to niobium was investigated. Calculations of the time of development of physical contact in welding Al2O3 and niobium, based on the conditions necessary to obtain a required creep rate, showed that total physical contact is formed with a temperature of 1500C, a pressure of 1.5 kg/sqmm and a time of 1000 sec. Thermodynamic calculations of the interaction of aluminum oxide with niobium pentoxide indicate the possible formation of a chemical bond at 1500C. The possibility of joining Al2O3 ceramic to niobium, using the calculated parameters, was proven by experiment. (Author)

Descriptors :   (*ALUMINA, *WELDING), NIOBIUM, WELDS, CERAMIC MATERIALS, THERMODYNAMICS, OXIDES, USSR

Subject Categories : Ceramics, Refractories and Glass
      Fabrication Metallurgy
      Couplers, Fasteners, and Joints

Distribution Statement : APPROVED FOR PUBLIC RELEASE