In commemoration of the 50th anniversary of the D. I. Mendeleev Moscow Institute of Chemical Technology: Department of Chemical Technology of Glass and Pyroceramics

Pavlushkin, N. M.

doi:10.1007/bf00671847

Cited by 6 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…To evaluate further the equilibrium concentration of defects in amorphous materials requires numerical values for H d and S d which can be calculated using density functional theory methods [32]. H d can be approximated since it should be approximately equal to half of the bond strength which is the case for silica where the bond strength of silicon equals 443 kJ mol −1 [33] and H d ≈ 220 kJ mol −1 [24]. Due to the lower symmetry of disordered materials S d can be expected to be higher than in a crystal lattice.…”

Section: Formation Of Network-breaking Defectsmentioning

confidence: 99%

Topologically disordered systems at the glass transition

Ojovan¹,

Lee²

2006

J. Phys.: Condens. Matter

118

View full text Add to dashboard Cite

The thermodynamic approach to the viscosity and fragility of amorphous oxides was used to determine the topological characteristics of the disordered network forming systems. Instead of the disordered system of atoms we considered the congruent disordered system of interconnecting bonds. The Gibbs free energy of network breaking defects (configurons) was found based on available viscosity data. Amorphous silica and germania were used as reference disordered systems for which we found an excellent agreement of calculated and measured glass transition temperatures. We revealed that the Hausdorff dimension of the system of bonds changes from Euclidian three-dimensional below to fractal 2.55±0.05-dimensional geometry above the glass transition temperature.

show abstract

Section: Formation Of Network-breaking Defectsmentioning

confidence: 99%

Topologically disordered systems at the glass transition

Ojovan¹,

Lee²

2006

J. Phys.: Condens. Matter

118

View full text Add to dashboard Cite

show abstract

“…eutectic point (~970 °C) in the quasi binary system Ca2P2O7-Ca(PO3)2 [16,54]. It is also well known that vapor pressure of polyphosphate melts is quite high [55]. Micrograph of crosssection (Figure 10d) of ceramics based on powder "Pyro_10Poly" after firing at 1100 °C does not show any grains and determination of their dimensions is not possible.…”

Section: (C) Pyro_10polymentioning

confidence: 99%

“…These phenomena were quite possible because the firing temperature 1000 • C and 1100 • C were higher than both the melting point (~984 • C) of calcium polyphosphate and eutectic point (~970 • C) in the quasi binary system Ca 2 P 2 O 7 -Ca(PO 3 ) 2 [16,54]. It is also well known that vapor pressure of polyphosphate melts is quite high [55]. Micrograph of cross-section (Figure 10d) of ceramics based on powder "Pyro_10Poly" after firing at 1100 • C does not show any grains and determination of their dimensions is not possible.…”

Section: (C) Pyro_10polymentioning

confidence: 99%

Bioceramics Based on β-Calcium Pyrophosphate

et al. 2022

View full text Add to dashboard Cite

Ceramic samples based on β-calcium pyrophosphate β-Ca2P2O7 were prepared from powders of γ-calcium pyrophosphate γ-Ca2P2O7 with preset molar ratios Ca/P = 1, 0.975 and 0.95 using firing at 900, 1000, and 1100 °C. Calcium lactate pentahydrate Ca(C3H5O3)2⋅5H2O and monocalcium phosphate monohydrate Ca(H2PO4)2⋅H2O were treated in an aqua medium in mechanical activation conditions to prepare powder mixtures with preset molar ratios Ca/P containing calcium hydrophosphates with Ca/P = 1 (precursors of calcium pyrophosphate Ca2P2O7). These powder mixtures containing calcium hydrophosphates with Ca/P = 1 and non-reacted starting salts were heat-treated at 600 °C after drying and disaggregation in acetone. Phase composition of all powder mixtures after heat treatment at 600 °C was presented by γ-calcium pyrophosphate γ-Ca2P2O7 according to the XRD data. The addition of more excess of monocalcium phosphate monohydrate Ca(H2PO4)2·H2O (with appropriate molar ratio of Ca/P = 1) to the mixture of starting components resulted in lower dimensions of γ-calcium pyrophosphate (γ-Ca2P2O7) individual particles. The grain size of ceramics increased both with the growth in firing temperature and with decreasing molar ratio Ca/P of powder mixtures. Calcium polyphosphate (t melt = 984 °C), formed from monocalcium phosphate monohydrate Ca(H2PO4)2⋅H2O, acted similar to a liquid phase sintering additive. It was confirmed by tests in vitro that prepared ceramic materials with preset molar ratios Ca/P = 1, 0.975, and 0.95 and phase composition presented by β-calcium pyrophosphate β-Ca2P2O7 were biocompatible and could maintain bone cells proliferation.

show abstract

“…In our case, the problem of determining stresses and deformations in a thin flat glass shell [2], which has a complex contour in plan and is based on an elastic-deformable base (adhesive bead), is solved numerically.…”

Section: Contact Modelmentioning

confidence: 99%

The formation of residual stresses in the bonding of automotive glass

et al. 2020

View full text Add to dashboard Cite

This article discusses the formation of residual stresses during the assembly of automotive glass. The influence of various parameters of the adhesive bead on the spatial deviations of glasses during their installation is shown. Currently, the glass assembly technology involves filling the gap between the automotive glass and the car body with a glue roller. It has been established that the formation of residual stresses is influenced by the width and thickness of the glue roll, with a minimum width of the glue roll during drying, a discontinuity of the glue joint along the contour is possible, and with a maximum width, unacceptable residual deformations occur in the glass, which lead to cracks.

show abstract

In commemoration of the 50th anniversary of the D. I. Mendeleev Moscow Institute of Chemical Technology: Department of Chemical Technology of Glass and Pyroceramics

Cited by 6 publications

References 0 publications

Topologically disordered systems at the glass transition

Topologically disordered systems at the glass transition

Bioceramics Based on β-Calcium Pyrophosphate

The formation of residual stresses in the bonding of automotive glass

Contact Info

Product

Resources

About