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Article
Properties of refractories after exposure to high pressure gases: I—Survey of commercial products
The chemical resistance of the bond phases in eleven commercial and three experimental cement-bonded castables and phosphate-bonded ramming mixes to an atmosphere of CO, CO2, H2O, CH4, H2, and H2S, at 6.9 MPa (10...
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Article
Properties of refractories after exposure to high pressure gases: II—Effect of exposure time
The chemical resistance of commercial and experimental cementbonded castables and phosphatebonded ramming mixes to an atmosphere of CO, CO2, H2, H2O, CH4 and H2S at 6.9 MPa (1000 psia) and 231, 371, and 538 °C wa...
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Article
Properties of refractories after exposure to high pressure gases: III—Effect of percent saturation
The dimensional stability, density, porosity and flexural strength of several cement and phosphatebonded refractories were determined before and after exposure to steam and CO containing atmospheres at ∼0, 13....
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Article
Thermally stimulated polarization current in sodium germanate glass
The electrical conductivity of XNa2O·(100−X)GeO2 glasses where X is 0.19 and 27.5 mol%, was studied by means of the technique of thermally stimulated polarization current. The compositional dependence of the para...
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Article
Properties of refractories after exposure to high pressure gases: IV-Dependence upon CO /steam ratio
The chemical resistance of the bond phases in several cementbonded castables and a phosphatebonded ramming mix to CO-steam mixtures of CO/H2O = 0.1, 1 and 3 at 6.9 MPa and 204, 241, 278, and 538 °C was evaluated ...
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Article
Properties of refractories after exposure to high pressure gases: V-effect of repeated boehmite formation and decomposition
The physical properties and flexural strength of dense alumina and lightweight insulating castables were investigated after exposure to a mixture of CO, CO2, CH4, H2, H2O (steam), and 1 vol pct H2S at 6.9 M Pa. T...
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Article
Properties of refractories after exposure to high pressure gases: VI-vaporvs liquid contact
The properties of several cement-bonded castables and a phosphate-bonded ramming mix were determined before and after exposure to saturated vapor or immersed in liquid in pure steam, CO-steam, and a gas mixtur...
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Article
Glass Formation in Microgravity
Containerless glass forming experiments conducted aboard the space shuttle STS-61A in October 1985, which used a single axis acoustic levitator/furnace (SAAL) are described. A total of eight spherical samples ...
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Article
Preparation of silica glass microspheres by sol-gel processing
A method for making glass microspheres by the sol-gel process has been developed. Porous silica microspheres were produced at temperatures as low as 500 °C and densified silica microspheres were prepared at 80...
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Chapter
Optically Transparent Glass Fiber Reinforced Poly(methylmethacrylate) Laminates
Transparent composites have been made at the University of Missouri-Rolla, USA. The refractive index of optical glass fibers was adjusted to match the refractive index of poly(methyl methacrylate) for the midd...
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Article
Temperature and wavelength dependent transmission of optically transparent glass fibre poly (methyl methacrylate) composites
The temperature and wavelength dependent transmission was measured for glass fibre reinforced transparent composites prepared by sheet lamination and pressure curing processes. A mathematical model using fibre...
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Article
Preparation and properties of mid-infrared glass fibres and poly (chlorotrifluoroethylene) composites
Fluorophosphate-glass-fibre-reinforced poly(chlorotrifluoroethylene) (PCTFE) composites with a transmittance of 80% from 0.4 to 3.7 μm were prepared. The transparent PCTFE composites transmit light to longer w...
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Article
Oxygen and phosphorus coordination around iron in crystalline ferric ferrous pyrophosphate and iron-phosphate glasses with UO2 or Na2O
Fe K-edge x-ray absorption fine-structure (XAFS) measurements were performed on glass samples of (Fe3O4)0.3(P2O5)0.7 with various amounts of Na2O or UO2. Near-edge and extended XAFS regions are studied and compar...
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Article
The Effects of Uranium on the Structure of Iron Phosphate Glasses
Because of their high chemical durability and waste loading capacity, iron phosphate glasses are a natural candidate for a nuclear waste disposal medium. We have studied the effects of uranium on the structure...
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Article
Local environment of iron and uranium ions in vitrified iron phosphate glasses studied by Fe K and U LIII-edge x-ray absorption fine structure spectroscopy
The local structure of iron and uranium ions in a series of iron phosphate glasses with the general composition (40 – x)Fe2O3–xUO2–60P2O5 and (1–x–y)(40Fe2O3–60P2O5)– xUO2–y(Na2O or CaO) was investigated using Fe...
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Article
A generalized method for determining the crystal nucleation and growth rates in glasses by differential thermal analysis
A generalized experimental method that uses differential thermal analysis (DTA) has been developed for determining the nucleation rate (I), the crystal growth rate (U), and the concentration of quenched-in nuclei...
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Article
Processing sodium tellurite melts in low gravity drop shaft: part I Melt evaporation and formation of solid particles from vapor
Glasses of Na2O·8TeO2 and Na2O·4TeO2 compositions adhered to a small platinum heating coil (2 to 3 mm ID, 5 to 6 mm long) were melted and evaporated in low gravity using the drop shaft at the Japan Microgravity C...
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Article
Processing sodium tellurite melts in low gravity drop shaft: Part II Melt solidification and glass formation
The effect of gravity on glass formation and crystallization of the Na2Ocdot;8TeO2 (NT8) and Na2Oċ4TeO2 (NT4) melts were investigated using the low gravity drop shaft at the Japan Microgravity Center (JAMIC). Thi...
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Article
On glass formation for a Na2O·4TeO2 melt: Effect of melting temperature, time, and raw material
The effect of melting temperature, time, and the type of raw material, NaNO3 or Na2CO3, as a source for Na2O on the glass formation for a Na2O·4TeO2(NT4) melt was investigated. Melting with NaNO3 at 750°C for a s...
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Article
Containerless processing of a lithium disilicate glass
Glasses of Li2O · 2SiO2 (LS2), and LS2 doped with 0.001 wt% platinum (LS2 + 0.001 wt% Pt) compositions were melted, cooled and reheated at controlled rates while levitated (containerless) inside an electrostatic ...
