B.H Liu
,
Y Zhang
,
S.X. Ouyang
,
and H.C. Gu (Research Institute of Technical Chemical Physics
,
East China University of Science and Technology
,
Shanghai 200237
,
China)(Department of Materials Physics
,
University of Science and Technology Beijing
,
Beijing 100083
,
China)(State Key Laboratory for Synthesis and Processing of Advanced Materials
,
Wuhan University of Technology
,
Wuhan 430070
,
China)
金属学报(英文版)
Titanium nitride powder was synthesized by microwave carbothermal reduction of titanium oxide. The mechanism and thermal dynamics of the reaction process were studied. The results show that the microwave carbothermal reduction technology has unique advantages over the conventional reduction methods. It can not only lower the reaction temperature, shorten the synthesis cycle, but also refine the product particles,as well as improving the reactivity of the powder.
关键词:
TiN microwave
,
null
K. S. Guan
,
L. Zhang
,
Y. G. Yao and M. H. Zhang 1) Research Insititute of Chemical Equipment
,
East China University of Science and Technology
,
Shanghai 200237
,
China 2) Department of Information and Control
,
Weihai Branch School
,
Harbin University of Technology
,
Weihai 264209
,
China 3) Laiyang Agricultural College
,
Laiyang 265200
,
China
金属学报(英文版)
Electroless NiP coating has stochastic nonlinear structure, which was in far from equilibrium and instability state. Fractal theory, an effective method for resolving nonlinear system, was introduced to describe the coating structure quantitatively. Disorker and self-similarity characteristics, which are the two basic features of fractal, were explained in this paper for the first time. The results show that amorphous NiP structure exhibits scale invariance and can be quantitatively characterized by fractal dimension. Based on the fractal principle, a two-dimensional computer simulation on electroless NiP deposition was carried out and it is in agreement with the experimental result. Finally, the fractal dynamics and process of atom growth were investigated. The results show that the atom deposition is reaction-limited growth process.
关键词:
fractal
,
null
,
null
Author N. Wang
,
B.S. Zhou
,
Z.D. Wang and D.D. Wu College of Mechanical Engineering
,
East China University of Science and Technology
,
Shanghai 200237
,
ChinaManuscript received 18 October 1998
金属学报(英文版)
Based on the fundamental definition of damage and inelastic strain energy hypothesis, this paper presents an inelastic strain energy damage model under creepfatigue interaction condition, with the damage constitutional equations and life prediction formulae respectively described by strain and stress. Creepfatigue tests with notchedbar specimens were carried out at 550. The actual creepfatigue lives are in good agreement to the predicted lives according to inelastic strain energy damage model.
关键词:
damage mechanics
,
null
,
null
,
null
