Calculation of the temperature-viscosity factor in the thermal endurance of glass, glass-crystal materials, and ceramics

1975 ◽  
Vol 32 (8) ◽  
pp. 526-527
Author(s):  
N. V. Solomin
Keyword(s):  
Viscosity Factor ◽  
Glass Crystal

Cluster-based composition interpretation of dual-phase glass-crystal alloys via the example of Mg49Cu42Y9

2021 ◽  
Vol 566 ◽  
pp. 120886
Author(s):  
Zengrui Wang ◽  
Rui Chen ◽  
Jianbing Qiang ◽  
Shuang Zhang ◽  
Yajun Zhao
Keyword(s):  
Dual Phase ◽  
Glass Crystal ◽  
Phase Glass

Diffusion Enhancement in Glassy Metals Under Non-Equilibrium Conditions

1995 ◽  
Vol 400 ◽  
Author(s):  
S. Bellini ◽  
G. Mazzone ◽  
A. Montone ◽  
M. Vittori-antisari Enea ◽  
C.R. Casaccia
Keyword(s):  
Free Volume ◽  
Growth Kinetics ◽  
Bulk Diffusion ◽  
High Energy ◽  
First Case ◽  
Diffusion Enhancement ◽  
Glass Crystal ◽  
Kinetics Of ◽  
Crystal Interface ◽  
Diffusion Properties

AbstractThe diffusion properties of a Ni-Zr metallic glass formed at the interface of a bulk diffusion couple have been studied in conditions far from a fully relaxed state. The growth kinetics of the interface film have been enhanced by both plastic deformation and high energy electron irradiation. Different results have been obtained in the two cases, since in the first case the film grows exponentially with time, while in the second case the usual square root dependence on time is observed. This behaviour has been interpreted as a consequence of the annihilation kinetics of the excess free volume introduced in the glass by the above methods. Two different mechanisms of free volume annihilation , namely exchange with a crystal vacancy at the glass-crystal interface and structural relaxation in the bulk glassy phase have been considered to be operative so that the nature of the growth kinetics has been found to depend on the mechanism predominant in each experimental condition.

Novel glass crystal catalysts for the processes of methane oxidation

2001 ◽  
Vol 64 (1-2) ◽  
pp. 59-67 ◽  
Author(s):  
A.G Anshits ◽  
E.V Kondratenko ◽  
E.V Fomenko ◽  
A.M Kovalev ◽  
N.N Anshits ◽  
...  
Keyword(s):  
Methane Oxidation ◽  
Glass Crystal

Effects of Dispersed Al2O3 Particles on Sintering of LTCC

2008 ◽  
Vol 39-40 ◽  
pp. 375-380
Author(s):  
Ralf Müller ◽  
Stefan Reinsch ◽  
Markus Eberstein ◽  
Joachim Deubener ◽  
A. Thiel ◽  
...  
Keyword(s):  
Volume Fraction ◽  
Al2o3 Particle ◽  
Model Composite ◽  
Heating Microscopy ◽  
Glass Crystal ◽  
Rate Controlled ◽  
Higher Temperature ◽  
Crystal Particle ◽  
Kinetics Of ◽  
Glass Viscosity

The sintering of Low Temperature Co-fired Ceramics prepared from alumoborosilicate glass- and Al2O3 powders of similar small particle size was studied by dilatometry, heating microscopy, microstructure analysis, glass- and effective viscosity measurements. The steric effect of Al3O3 inclusions was studied using a “non-reactive” model composite. With increasing Al3O3 volume fraction ( Φ ≤ 0.45), sintering decelerates and its final stage shifts to higher temperature. The attainable shrinkage is reduced as Al2O3 particle clusters bearing residual pores become more frequent. The kinetics of sintering could be described formally superposing the weighed contributions of differentially sized and randomly composed glass-crystal particle clusters and assuming a sintering rate controlled by the effective matrix viscosity, which increases with Φ and with progressive wetting of Al2O3 particles during densification. The “reactive” model composite shows significant dissolution of Al2O3 into the glass, which has two opposed effects on sintering: reducing Φ and increasing glass viscosity. For the present case ( Φ = 0.25), the latter effect dominates and sintering is retarded by Al2O3 dissolution. Crystallization of wollastonite starts after full densification. Dissolution of Al2O3 was found to promote the subsequent growth of anorthite.

scholarly journals Critical Mach Numbers of Flow around Two-Dimensional and Axisymmetric Bodies

Aerodynamics ◽  
2021 ◽  
Author(s):  
Vladimir Frolov
Keyword(s):  
Mach Number ◽  
Cross Section ◽  
Flow Simulation ◽  
The Body ◽  
Two Dimensional ◽  
Critical Mach Number ◽  
Method Of Integral Relations ◽  
Viscosity Factor ◽  
Mach Numbers ◽  
Axisymmetric Bodies

The paper presents the calculated results obtained by the author for critical Mach numbers of the flow around two-dimensional and axisymmetric bodies. Although the previously proposed method was applied by the author for two media, air and water, this chapter is devoted only to air. The main goal of the work is to show the high accuracy of the method. For this purpose, the work presents numerous comparisons with the data of other authors. This method showed acceptable accuracy in comparison with the Dorodnitsyn method of integral relations and other methods. In the method under consideration, the parameters of the compressible flow are calculated from the parameters of the flow of an incompressible fluid up to the Mach number of the incoming flow equal to the critical Mach number. This method does not depend on the means determination parameters of the incompressible flow. The calculation in software Flow Simulation was shown that the viscosity factor does not affect the value critical Mach number. It was found that with an increase in the relative thickness of the body, the value of the critical Mach number decreases. It was also found that the value of the critical Mach number for the two-dimensional case is always less than for the axisymmetric case for bodies with the same cross-section.

Nanostructured glass-crystal materials with lead sulfide for passive Q switching of IR lasers

2006 ◽  
Vol 73 (9) ◽  
pp. 576 ◽  
Author(s):  
A. A. Onushchenko ◽  
A. A. Zhilin ◽  
G. T. Petrovskiĭ ◽  
É. L. Raaben ◽  
M. S. Gaponenko ◽  
...  
Keyword(s):  
Lead Sulfide ◽  
Q Switching ◽  
Glass Crystal

scholarly journals Temperature and the Viscosity of Protoplasm

1924 ◽  
Vol 13 (2) ◽  
pp. 331-339 ◽  
Author(s):  
C. F. A. Pantin
Keyword(s):  
Chemical Process ◽  
Plant Cells ◽  
Effect Of Temperature ◽  
Biological Processes ◽  
Nereis Diversicolor ◽  
Centrifuge Method ◽  
Temperature Coefficients ◽  
Protoplasmic Viscosity ◽  
Viscosity Factor ◽  
Viscosity Changes

(1) The effect of temperature on the viscosity of the protoplasm has been determined in the unripe eggs of Nereis diversicolor by the centrifuge method.The viscosity rises as the temperature falls, the rise becoming rapid near 0°C.(2) These changes of viscosity with temperature are similar to those described by Weber (21) in the protoplasm of certain plant cells.(3) Attention is drawn to the fact that the temperature coefficients of biological processes should be corrected for the viscosity of the protoplasm in which they occur.(4) It is shown that the relative changes of protoplasmic viscosity with temperature are probably of the order required to make the temperature coefficients of biological processes constant when corrected for the viscosity factor.(5) The magnitude of the temperature coefficients of biological processes when corrected for viscosity changes is probably of the same order as that of the temperature coefficients of a chemical process when corrected for changes in the viscosity of its medium.

Intragranular glass/crystal conjugated particles in strip cast Nd-Fe-B flakes

2020 ◽  
Vol 495 ◽  
pp. 165863
Author(s):  
Hansheng Chen ◽  
Wanqiang Xu ◽  
Chunguang Tang ◽  
Zibin Chen ◽  
Hongwei Liu ◽  
...  
Keyword(s):  
Strip Cast ◽  
Glass Crystal

Kinetics of failure in a composite glass-crystal system

1986 ◽  
Vol 18 (3) ◽  
pp. 404-407
Author(s):  
V. N. Dubovik ◽  
A. M. Raikhel' ◽  
L. G. Ivchenko ◽  
O. A. Nepomnyashchii
Keyword(s):  
Crystal System ◽  
Composite Glass ◽  
Glass Crystal ◽  
Kinetics Of
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