Diffusion Mechanism for the Nickel-Activated Sintering of Molybdenum
- 1 February 1965
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 36 (2) , 595-598
- https://doi.org/10.1063/1.1714036
Abstract
The sintering kinetics of cold‐pressed molybdenum powder and molybdenum powder with nickel additions of 0.50–0.75 wt% have been investigated in the temperature range from 1100° to 1400°C. Diffusion coefficients calculated from the sintering kinetics indicate that molybdenum densifies by a grain boundary diffusion process in the range 1100° to 1400°C. The activation energy for the process is about 38 kcal/mole. The nickel additions, present on particle surfaces, enhanced the sintering rate such that it was possible to achieve densities in excess of 90% of theoretical after sintering for only 60 min. It is suggested that the mechanism for the nickel‐activated sintering of molybdenum is the increased diffusion rate of molybdenum through the grain boundary layer of nickel. An activation energy of 21 kcal/mole was determined for this process.This publication has 5 references indexed in Scilit:
- Diffusion Mechanism for Tungsten Sintering KineticsJournal of Applied Physics, 1964
- Self-diffusion in molybdenumPhilosophical Magazine, 1963
- Sintering kinetics in tungsten powderJournal of the Less Common Metals, 1963
- The Activated Sintering of Tungsten with Group VIII ElementsJournal of the Electrochemical Society, 1963
- Sintering Crystalline Solids. I. Intermediate and Final State Diffusion ModelsJournal of Applied Physics, 1961