Search Results - "Boakye, Emmanuel E."

In situ Y2Si2O7 coatings on SiC fibers: Thermodynamic analysis and processing by Mogilevsky, Pavel, Boakye, Emmanuel E., Key, Thomas S., Parthasarathy, Triplicane A., Hay, Randall S., Cinibulk, Michael K.

“…It is shown using thermodynamic analysis and kinetic modeling that a processing window exists for the formation of Y2Si2O7 coatings on SiC. The proposed method…”
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The Effect of Polymer Waste Addition on the Compressive Strength and Water Absorption of Geopolymer Ceramics by Linda Bih, Numfor, Aboubakar Mahamat, Assia, Bidossèssi Hounkpè, Jechonias, Azikiwe Onwualu, Peter, Boakye, Emmanuel E.

“…The quantity of polymer waste in our communities is increasing significantly. It is therefore necessary to consider reuse or recycling waste to avoid an…”
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The Effect of Bone Ash on the Physio-Chemical and Mechanical Properties of Clay Ceramic Bricks by Bih, Numfor Linda, Mahamat, Assia Aboubakar, Chinweze, Chukwuemeka, Ayeni, Olugbenga, Bidossèssi, Hounkpè Jechonias, Onwualu, Peter Azikiwe, Boakye, Emmanuel E.

“…Bone ash waste can be used to fabricate clay ceramic bricks, consequently managing their pollution of the environment. This is because bone ash (BA) and clay…”
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Precipitation Coating of Monazite on Woven Ceramic Fibers: I. Feasibility by Fair, Geoff E., Hay, Randall S., Boakye, Emmanuel E.

“…Monazite coatings were deposited on woven cloths and tows of Nextel™ 610 fibers by heterogeneous nucleation and growth using solution precursors. Initial…”
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Effectiveness of Monazite Coatings in Oxide/Oxide Composites after Long-Term Exposure at High Temperature by Keller, Kristin A., Mah, Tai-Il, Parthasarathy, Triplicane A., Boakye, Emmanuel E., Mogilevsky, Pavel, Cinibulk, Michael K.

“…The effectiveness of monazite (LaPO4) in providing an oxidation‐resistant weak fiber/matrix interface was evaluated in a fiber roving/thin…”
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Monazite Coatings on Fibers: I, Effect of Temperature and Alumina Doping on Coated-Fiber Tensile Strength by Hay, Randall S., Boakye, Emmanuel E.

“…Monazite was continuously coated onto Nextel 720 fibers, using an aqueous precursor and in‐line heat treatment at 900°–1300°C. Some experiments were repeated…”
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Evaluation of SiC/SiC minicomposites with yttrium disilicate fiber coating by Boakye, Emmanuel E., Key, Thomas S., Parthasarathy, Triplicane A., Keller, Kristin A., Opeka, Samuel J., Hay, Randall S., Cinibulk, Michael K.

“…Hi‐Nicalon‐S/α‐Y2Si2O7/SiC minicomposites were formed by polymer infiltration pyrolysis (PIP) and characterized by TEM, SEM fractography, tensile testing, and…”
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In situ Y2Si2O7 coatings on Hi‐Nicalon‐S SiC fibers: Phase formation and fiber strength by Boakye, Emmanuel E., Mogilevsky, Pavel, Key, Thomas S., Parthasarathy, Triplicane A., Keller, Kristin A., Opeka, Samuel J., Hay, Randall S., Cinibulk, Michael K., Corns, Randall

“…Y2Si2O7 coatings were formed on Hi‐Nicalon‐S SiC fibers by reaction of solution‐derived YPO4 coatings with glass SiO2 scales formed by fiber oxidation. Two…”
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Sol-Gel Synthesis and Formation Mechanism of Ultrahigh Temperature Ceramic: HfB2 by Venugopal, Saranya, Boakye, Emmanuel E., Paul, Anish, Keller, Kristin, Mogilevsky, Pavel, Vaidhyanathan, Bala, Binner, Jon G. P., Katz, Allan, Brown, Peter M.

“…Hafnium diboride (HfB2) powder has been synthesized via a sol–gel‐based route using phenolic resin, hafnium chloride, and boric acid as the source of carbon,…”
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Processing and Testing of RE2Si2O7 Fiber-Matrix Interphases for SiC-SiC Composites by Boakye, Emmanuel E., Mogilevsky, Pavel, Parthasarathy, Triplicane A., Keller, Kristin A., Hay, Randall S., Cinibulk, Michael K.

“…Rare‐earth disilicates (RE2Si2O7) are investigated for use as oxidation‐resistant alternatives to carbon or BN fiber–matrix interphases in ceramic matrix…”
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Development and Characterization of Continuous SiC Fiber-Reinforced HfB2-Based UHTC Matrix Composites Using Polymer Impregnation and Slurry Infiltration Techniques by Leslie, Clifford J., Boakye, Emmanuel E., Keller, Kristin A., Cinibulk, Michael K.

“…This paper discusses the development of continuous SiC fiber‐reinforced HfB2‐SiC composite laminates. A range of techniques, based on resin‐based precursors…”
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Total Thermal Expansion Coefficients of the Yttrium Silicate Apatite Phase Y4.69(SiO4)3O by Key, Thomas S., Presley, Kayla F., Hay, Randall S., Boakye, Emmanuel E.

“…The formation of the Y4.69(SiO4)3O apatite phase was observed in compositions targeted at the yttrium monosilicate and disilicate phases. Through the use of…”
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Synthesis and Phase Composition of Lanthanide Phosphate Nanoparticles LnPO4 (Ln=La, Gd, Tb, Dy, Y) and Solid Solutions for Fiber Coatings by Boakye, Emmanuel E., Mogilevsky, Pavel, Hay, Randall S., Fair, Geoff E.

“…Rare earth phosphates with rare earths of Gd, Tb, and Dy can form either monazite or xenotime. Hydrated lanthanide phosphate precursors to monazite and…”
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Evolution of Texture in Rhabdophane-Derived Monazite Coatings by Mogilevsky, Pavel, Hay, Randall S., Boakye, Emmanuel E., Keller, Kristen A.

“…Microstructure and texture development of fiber coatings of rhabdophane‐sol‐derived monazite was studied. As‐deposited textures and orientation relationships…”
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Precipitation Coating of Monazite on Woven Ceramic Fibers: II. Effect of Processing Conditions on Coating Morphology and Strength Retention of Nextel™ 610 and 720 Fibers by Fair, Geoff E., Hay, Randall S., Boakye, Emmanuel E.

“…Woven cloths of Nextel™ 610 and 720 fibers were coated with monazite by precipitation. The cloths were first saturated with concentrated precursor solutions,…”
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Processing of 0.7BaTiO3-0.3BiScO3 Solid-Solution Coatings by Boakye, Emmanuel E., Mogilevsky, Pavel, Keller, Kristin A., Lee, HeeDong, Godar, Trenton, Hay, Randall S.

“…Coatings with the 0.7BaTiO3–0.3BiScO3 solid‐solution composition were formed on palladium and single‐crystal (001) SrTiO3 substrates using a polymeric metal…”
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Precipitation Coating of Monazite on Woven Ceramic Fibers: III-Coating without Strength Degradation Using a Phytic Acid Precursor by Fair, Geoff E., Hay, Randall S., Boakye, Emmanuel E., Morgan, Peter E. D., Marzke, Robert F., Sharma, Ramesh

“…Multiple coatings of La‐monazite (LaPO4) were applied to Nextel™ 610 and 720 oxide fibers using a heterogeneous nucleation and growth coating process with…”
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Precipitation Coating of Rare-Earth Orthophosphates on Woven Ceramic Fibers-Effect of Rare-Earth Cation on Coating Morphology and Coated Fiber Strength by Fair, Geoff E., Hay, Randall S., Boakye, Emmanuel E.

“…Monazite (La, Ce, Nd, and GdPO4) and xenotime (Tb, Dy, and YPO4) coatings were deposited on woven Nextel™ 610 and 720 fibers by heterogeneous precipitation…”
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Monazite Coatings on Fibers: II, Coating without Strength Degradation by Boakye, Emmanuel E., Hay, Randall S., Mogilevsky, Pavel, Douglas, L. M.

“…Washed and unwashed rhabdophane (LaPO4·xH2O) sols were used to apply monazite coatings to 3M Nextel 720 and 610 fibers. This precursor was designed to minimize…”
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Fiber Strength Retention of Lanthanum- and Cerium Monazite-Coated Nextel™ 720 by Boakye, Emmanuel E., Mogilevsky, Pavel

“…Nextel™ 720 fibers were coated with LaPO4 and CePO4 monazite. The coatings were applied using washed and unwashed rhabdophane sols derived from…”
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