A Mixed Interface Reaction/Diffusion Control Model for Oxidation of Si3 N 4

1991 ◽  
Vol 138 (10) ◽  
pp. 3001-3007 ◽  
Author(s):  
Krishan L. Luthra
Keyword(s):  
Interface Reaction ◽  
Reaction Diffusion ◽  
Control Model ◽  
Diffusion Control

The Interface Reaction between Titanium and Iron-Nickel alloys

2018 ◽  
Vol 37 (7) ◽  
pp. 683-691
Author(s):  
Bartek Wierzba ◽  
Wojciech J. Nowak ◽  
Daria Serafin
Keyword(s):  
Solid State ◽  
Chemical Interaction ◽  
Pure Titanium ◽  
Interface Reaction ◽  
Reaction Diffusion ◽  
Diffusion Path ◽  
Chemical Conversion ◽  
Layer Sequence ◽  
Iron Nickel ◽  
Fast Dissolution

AbstractThe reaction zones between pure titanium and iron-nickel and pure nickel at 1173 K have been characterized. Two alloys with different initial composition were analyzed. When Ni80Fe20 is used the layer sequence at the reaction interface is: Ni80Fe20 → Ni3Ti → NiTi → NiTi2 →Ti, while for Ni48Fe52 the sequence is: Ni48Fe52 → Ni3Ti → TiFe2 → TiFe → NiTi2 → Ti. The difference is in formation of NiTi, TiFe2 and TiFe phases. The reaction zone remains very thin independently of time due to the fast dissolution rate of Ti in the alloy. The two different elementary chemical interaction processes have been identified in this article, namely the growth of the reaction layers by solid state diffusion and chemical conversion of the compounds by reaction-diffusion in the solid state. The mathematical description combining these processes is presented for description of the diffusion path generated during diffusion process.

scholarly journals Reaction-diffusion control in somitogenesis

2001 ◽  
Vol 41 (supplement) ◽  
pp. S186
Author(s):  
J. Ozaki ◽  
M. Hirata ◽  
S. Kondo
Keyword(s):  
Reaction Diffusion ◽  
Diffusion Control

Interrogating Biomineralization One Amino Acid at a Time: Amplification of Mutational Effects in Protein-Aided Titania Morphogenesis through Reaction-Diffusion Control

2021 ◽  
Author(s):  
Karthik Pushpavanam ◽  
Brittney Hellner ◽  
François Baneyx
Keyword(s):  
Amino Acid ◽  
Reaction Diffusion ◽  
Diffusion Chamber ◽  
Diffusion Control ◽  
Inorganic Precursor ◽  
Agarose Hydrogel ◽  
Time Amplification

To emulate the control that biomineralizing organisms exert over reactant transport, we construct a countercurrent reaction-diffusion chamber in which an agarose hydrogel regulates the fluxes of inorganic precursor and precipitating...

scholarly journals Grain Growth Control of Dielectric and Magnetic Ceramics

Ceramist ◽  
2021 ◽  
Vol 24 (3) ◽  
pp. 260-272
Author(s):  
Kyoung-Seok Moon
Keyword(s):  
Growth Rate ◽  
Grain Growth ◽  
Driving Force ◽  
Growth Control ◽  
Interface Reaction ◽  
Ceramic Materials ◽  
Interface Energy ◽  
Diffusion Control ◽  
Interface Mobility ◽  
Interface Curvature

The sintering process transported the atoms in the materials by decreasing the total interface energy. The microstructure changes as a result of grain growth and densification under the capillary driving force due to the interface curvature among grains. The grain growth rate is expressed as the product of the interface mobility and the driving force. According to grain growth theories, the mobility of the interface governed by diffusion control is constant but interface mobility is nonlinear when the movement of an interface is governed by interface reaction. As the growth rate is nonlinear for the regime of interface reaction control, the grain growth is nonstationary with annealing time. The microstructure can be controlled by changing the growth rate of an individual grain with the correlation between the maximum driving force and the critical driving force for appreciable growth. The present paper discusses applications of the principle in the fabrication of dielectric and magnetic ceramic materials.

scholarly journals Modelling the Elements Reaction–Diffusion Behavior on Interface of Ti/Al2O3 Composite Prepared by Hot Pressing Sintering

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 259
Author(s):  
Guopu Shi ◽  
Liu Zhang ◽  
Zhi Wang
Keyword(s):  
Reaction Layer ◽  
Sintering Temperature ◽  
Interface Reaction ◽  
Reaction Diffusion ◽  
Exponential Form ◽  
Diffusion Behavior ◽  
Al2o3 Composite ◽  
Hot Pressing Sintering ◽  
Heat Preservation ◽  
The Relationship

Element reaction–diffusion of Ti/Al2O3 composite which was fabricated at various sintering temperatures, holding times, and a sintering pressure of 30 MPa has been discussed in the present research. Results show that the thickness of the reaction layer of the Ti-Al2O3 interface was increased in exponential form in correspondence with the increase of the sintering temperature. Furthermore, according to analysis, the relationship between the thickness of the interface reaction layer, sintering temperature, and heat preservation time acquiring the kinetic equation of interfacial reaction of Ti/Al2O3 composite was d = 182.5exp(−6.6 × 104/RT)t0.48 by linear fitting.

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