Written in EnglishRead online
|LC Classifications||TP858 .K5713|
|The Physical Object|
|Number of Pages||92|
|LC Control Number||79234609|
Download Devitrification of silicate glasses.
Additional Physical Format: Online version: Knapp, Oszkár. Devitrification of silicate glasses. Budapest, Akadémiai Kiadó, (OCoLC) The isotherms and boundary curves in that portion of the ternary system Na 2 O‐SiO 2 – 2 –SiO 2 of direct application to glass technology, namely, from 64 to 78% SiO 2, 0 to 20% CaO, including the whole of the field of the compound Na 2 O.3CaO.6SiO 2, and portions of the adjoining fields of Na 2 O.2SiO 2, Na 2 O.2CaO.3SiO 2, 2, tridymite, and quartz, have been determined Cited by: Devitrification of a lithium disilicate glass Paperback – January 1, by Henry M.
Harris (Author) See all formats and editions Hide other formats and editions. Price New from Used from Paperback "Please retry" $ $ — Paperback $ 1 New from $Author: Henry M. Harris. Devitrification growth‐rate data and traction‐viscosity data are reported for high‐silica glasses of the system Al 2 O 3 ‐SiO 2.
Glasses with added Al 2 O 3 were found to devitrify to cristobalite more rapidly than ultrapure silica glasses at a given temperature, and yet their fluidities (i.e., reciprocal viscosities) were found to be by: Silica glass is amorphous SiO 2 used in semiconductor devices production processes 1) and in production of bulbs of high-intensity discharge (HID) lamps.
2) Silica glasses of various types are used for these applications. 1–7) Silica glasses of some types are oxygen-deficient in the stoichiometric sense. 3,8–13). Sometimes crystallization of glasses, so-called devitrification, degrades the Author: Naohiro Horii, Nobu Kuzuu, Hideharu Horikoshi.
Phase separation and partial devitrification in soda-lime silicate glasses M. Suszynska 1, L. Krajczyk 1 & R. Capelletti 2. SILICATE GLASSES A. Binary Systems 1.
Alkali Silicate Systems a. Structural considerations formation in the alkali silicate systems diagrams of the alkali silicate systems d. The kinetics of devitrification 2. Binary Systems Containing Alkaline Earth Oxides B. THE NA2O-CAO-SIO2 SYSTEM 1. Structural Considerations 2.
The Glass. When little water is present, devitrification may be described in much the same terms as those which apply to the crystallization of silicate melts.
The writer uses simple rate theory and the available experimental data to set an approximate lower limit to the time required for thermal reconstruction of natural glasses as a function of temperature. The time required for a glass at ° C to become a felsite.
Purchase Industrial glass: glazes and enamels - 1st Edition. Print Book & E-Book. ISBNThe book covers almost all important aspects of Glass and Ceramic Industry: Properties, Applications, Manufacturing, Processing and Photographs of Plant &Machinery with Supplier’s Contact Details.
The major contents of the book are types of glasses, silicate glasses, boric oxide and borate glasses. Devitrification of vacuum-melted glasses of the lithium metasilicate-silica compositional series (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors: J I Paige; Henry M Harris; Hal J Kelly; United States.
Bureau of Mines. I want to chatter about glass devitrification but there's far too much to say in a single posting. Therefore I'll start the topic by talking about correctly identifying devitrification. I will leave further related topics for future postings.
As is usual, I'll be walking you down a meandering path that others do not take. As for the silicate glasses, other mechanisms than these have been proposed to explain the nanoscale devitrification microstructure. A point that has received particular attention is the role of composition on glass formation and crystallization.
Devitrification of silicate glasses. book and Crystallization of Glasses details glass structural analysis from an experimental perspective.
The book is comprised of eight chapters that cover various structural concepts. The text first introduces the basic elements of glass structures, and then proceeds to discussing the development of classical structure theories.
Devitrification can occur when heating your glass for too long at a high temperature. It often occurs when you fire “Float Glass” which is glass with an unknown COE (coefficient of expansion). Bottom line, you are getting undesired results in the look of the glass surface.
Book. Jan ; Mathieu Allix; Laurent Cormier An interrelationship between parameters of short and intermediate range order in silicate glasses and the tendency to nucleate homogeneously in. This volume is a compilation of data on the properties of glasses.
The authors examine and correlate the data on the properties of multicomponent commercial silicate glasses, vitreous silica, and binary and ternary laboratory glasses. Thermodynamic, thermal, mechanical, electrical, and.
Devitrification is the process of crystallization in a crystalfree amorphous glass which includes holding at high temperature for a long time, which causes the nucleation of crystals . Figure 1 Ceramic pattern for jet turbine ceramic cores.
The piece is placed in a turbine pattern. Phase separation and partial devitrification in soda-lime silicate glasses Phase separation and partial devitrification in soda-lime silicate glasses Suszynska, M.; Krajczyk, L.; Capelletti, R.
Appl. Phys. A 68, – () / DOI /s Applied Physics A Materials Science & Processing Springer-Verlag Phase separation and partial devitriﬁcation in.
The growth of crystals on glass, aka devitrification, aka devit, is not that common or easy to create. But if devit does appear on your fired glass, there are several ways to remove it. One simple way, for glass that's flat, is to sift a very thin layer of Clear powder (2 grains thick) over the entire piece until the surface appears white.
Then re-fire at °°F (°°C) for about ten minutes, depending. Crystallisation and Devitrification. 7: Nucleating Agents and Glass Types for Controlled present produced properties proportions range reduction region relatively residual glass resistance result sealing showed shown silica silicate glasses similar solid solution specimens stresses structure studies suitable surface About Google Books.
Glasses with an excess of lime in their composition are more subject to devitrification than lead glasses or those of moderate lime content constructed from more complex formulas. The presence of a small proportion of alumina in glass prevents this tendency to devitrification and ensures permanency.
Those glasses which have the highest silica. Search within book. Front Matter. Pages N2-XIII. PDF. Introduction. glass, and other industries. Moreover, intensive fun damental research on silicates has been carried out for many years because silicates are, due to their enormous variability, ideally suited for the study of general chemical and crystallographic principles.
Glass Devitrification – Look Closer Posted on 19 January, by chatterglass I want to chatter about glass devitrification but there’s far too much to say in a single posting.
Glass devitrification is caused by phase separation, and no crystal has been found in devitrificated glass. The changes of mole ratios of CaO and MgO have some effect on B2O3 coordination, which. Silicon is the main glass-forming element in a borosilicate waste glass and its basic elements are SiO 4 tetrahedra, which comprise bridging or cross-linking and non-bridging atoms of oxygen (NBO).
In a silicate glass the SiO 4-tetrahedra vertices connect these elements to each other through bridging oxygen atoms so that the network consists of chains of various lengths. There are two general mechanisms of devitrification in glass: heterogeneous nucleation of crystals from surfaces and impurities and homogeneous nucleation from the volume.
It is thought that structural similarities between glass and crystal at the intermediate-range level influence the mechanism followed; however, there are scarce experimental studies to test this hypothesis. In this paper. Polymerization of silicate and aluminate tetrahedra in glasses, melts, and aqueous solutions—V.
The polymeric structure of silica in albite and anorthite composition glass and the devitrification of amorphous anorthite. Geochimica et Cosmochimica Acta48 (12), Devitrification, process by which glassy substances change their structure into that of crystalline solids. Most glasses are silicates (compounds of silicon, oxygen, and metals) in which the atomic structure does not have the repetitive arrangement required for the formation of crystals.
Glass is formed by the cooling of a rock magma too rapidly for this structural regularity to become established. Glasses containing higher mole fractions of Li2O were found to devitrify when they were subject to a thermal treatment typical for the one used when fusing enamels.
The devitrification characteristics expressed as crystallization temperature and liquidus temperature has been monitored by DSC and gradient furnace thermal analysis.
Polymerization of silicate and aluminate tetrahedra in glasses, melts, and aqueous solutions—V. The polymeric structure of silica in albite and anorthite composition glass and the devitrification of amorphous anorthite de Jong, B. S. Get Textbooks on Google Play. Rent and save from the world's largest eBookstore.
Read, highlight, and take notes, across web, tablet, and phone. Silica glass having the excellent resistance to chemicals is most suitable as the distillation container for various solvents and acid solutions and the dissolution and washing container for various kinds of substances, provided, however, that attention shall be taken for long-time use, because the etching and/or surface devitrification of silica glass may occur in the solution of or under the.
Q: What is devitrification, how does it happen, and how can it be prevented. A glass is by definition a liquid at all temperatures. Compositionally a typical glass consists of the 'glass (or network) formers' (SiO 2 and B 2 O 3), fluxes (also called alkaline metals, K 2 O and Na 2 O), and the network (or matrix) modifying alkaline earths (CaO, BaO, PbO, ZnO).
Silicate () and borate (B3) bioactive glass coatings were successfully deposited on titanium using the nanosecond Pulsed Laser Deposition technique. The coatings’ microstructural characteristics, compositions and morphologies were examined by a number of physico-chemical techniques.
The deposited coatings retain the same functional groups of the targets, are a few microns thick. glasses has yielded fundamental data on the devitrification characteristics of silicate melts, the escape of gases from glasses, the melting reactions in glass mixtures, viscosity relations of commercial glasses, opacity in glasses, and the chemical resistance of glass.
Properties of Barium Titanium Silicate Glasses Given W. Cleek and Edgar H. Hamilton The glass-forming region of Lhe BaO-TiSi02 system has been deLcTIn ined. The refractive index, nD, nu value, liquidus temperature, and transmittances in the ncar infrared have been measured.
meltingchamber,corundum(A)andanalkali-aluminum-silicate liquidare the resultof thereaction between theclay and the alkalies, 3 unlesstheclayblock is extremely siliceous, and thenthe liquid silicate.
An object of the present invention is to provide a glass for chemical strengthening which is capable of improving strength as compared with an ordinary soda lime silicate glass even when the same chemical strengthening treatment as that in a conventional process is applied and has good devitrification characteristics, a chemically strengthened glass using the glass for chemical strengthening.
Glass compositions containing high mole fractions of Li2O were found to devitrify when they were heated to temperatures up to °C typical for the procedure used when fusing enamels to tableware glasses. The devitrification characteristics are complex and several peaks atributed to crystallisation were found by DSC characterisation.
From the kinetic point of view, the devitrification process seems to take place by the nucleation and growth mechanism. The temperature dependence of devitrification of (gamma)-Na(,2)Si(,2)O(,5) phase appears to be non-Arrhenius.
The TTT diagram has been set up for a 20 mol.% Fe(,2)O(,3) glasses under isothermal anneal in the Ar gas.Clinoptilolite forms as a devitrification product (the conversion of glass to crystalline material) of volcanic glass in tuffs.
Tuffs are consolidated pyroclastic rocks. The devitrification occurs when the glass is in contact with saline waters. Clinoptilolite is also found in the vesicles of volcanic rocks such as basalts, rhyolites and andesites.from the relative oxides) which, these last ones, could act as nucleating centres for a partial devitrification of the glass, as is known to occur in the multicomponent materials .
Multilevel tunnelling systems and fractal clustering in the low-temperature mixed alkali-silicate glasses.