首页 | 本学科首页   官方微博 | 高级检索  
     


Production of Ni3Ti?TiC x intermetallic-ceramic composites employing combustion synthesis reactions
Authors:Douglas E Burkes  Guglielmo Gottoli  John J Moore and Hu Chun Yi
Affiliation:(1) Metallurgical and Materials Engineering Department, Institute for Space Resources, Colorado School of Mines, 80401 Golden, CO;(2) Department of Chemical and Biomolecular Engineering, University of Melbourne, 3010 Melbourne, Victoria, Australia;(3) Advanced Materials and Combustion Laboratory, Guigne International Ltd., A1L 1C1 St. John's, NL, Canada
Abstract:Combustion synthesis (CS) of nickel, titanium, and carbon (graphite) reactant particles can result in NiTi−TiC (stoichiometric) or Ni3Ti−TiC x (nonstoichiometric) composites. Since NiTi exhibits both superelasticity and shape memory properties while Ni3Ti does not, it is important to understand the SHS reaction conditions under which each of these composite systems may be synthesized. The stoichiometry of TiC x , for which 0.3≤x≤0.5, has an important controlling effect on the formation of either Ni3Ti or NiTi; i.e., formation of TiC0.7 results in a depletion of titanium and formation of Ni3Ti. This deficiency should be considered when developing the SHS reaction. This article examines the SHS conditions under which Ni3Ti−TiC x composites are produced. Ignition, combustion and microstructure characteristics of nickel, titanium, and carbon (graphite) particles were investigated as a function of initial relative density and thermophysical properties of the reactant mixture. Combination of the thermophysical properties and burning velocities controlled TiC x particle size, yielding a dependence of particle size on cooling rate. Theoretical calculations were performed and are in good agreement with the experimental data presented. Guglielmo Gottoli, formerly Graduate Research Assistant, Metallurgical and Materials Engineering Department, Institute for Space Resources, Colorado School of Mines
Keywords:
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号