Investigation of a New Class of Disordered Inorganic Materials

Sambasivan, S.; Steiner, Kimberly

doi:10.21236/ada389094

Cited by 7 publications

(15 citation statements)

References 44 publications

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“…The band at 1383 cm −1 can be attributed to the antisymmetric NO 3 − stretching vibration, directly arising from the nitrate groups in the powder 14 . The strong absorptions at around 1040, 795, and 545 cm −1 indicate the formation of an Al–O–P network 15 . The bands for the silica network should appear at around 1080, 780, and 460 cm −1 , 16,17 which are considered to overlap with the absorptions for Al–O–P.…”

Section: Resultsmentioning

confidence: 98%

“…Fuse silica faces this problem due to the reaction of silica with H 2 O to form a Si–OH bond. Fortunately, a previous study indicated that aluminum phosphate was hydrophobic 13 . Although silica was added to aluminum phosphate, the formation of mullite at temperatures higher than 1250°C could reduce the effect of silica on water resistance.…”

Section: Resultsmentioning

confidence: 99%

“…All these materials possess a high flexural strength of about 200 MPa and a low dielectric constant. Among these systems, aluminum phosphate can withstand a temperature as high as 1400°C, 13 which renders it as a potential radome material for ultrasonic vehicles. However, our preliminary research found that the pure aluminum phosphate has a slightly high dielectric constant (∼4.5 at 10 GHz).…”

Section: Introductionmentioning

confidence: 99%

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Aluminum Phosphate–Mullite Composites for High‐Temperature Radome Applications

Wang

Liu

2009

Int J Applied Ceramic Tech

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An AlPO 4 -SiO 2 powder with a composition of Al:P:Si 5 1.5:1:0.1 was synthesized by the sol-gel method using aluminum nitrate, phosphate acid, and tetraethoxysilane. The structural evolution of this material was characterized by thermal gravimetric analysis-differential scanning calorimetry, Fourier transform infrared, and X-ray diffraction. By adding silica in AlPO 4 , the sinterability of the AlPO 4 was enhanced because of the reactions between excess alumina and silica to form mullite. The sintered composites have a high strength and good dielectric properties at 10 GHz. Because of the formation of mullite at high temperatures, the composites showed a hydrophobic property. These unique properties indicate that the sintered AlPO 4 -mullite composites are suitable for the radome application.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Aluminum Phosphate–Mullite Composites for High‐Temperature Radome Applications

Wang

Liu

2009

Int J Applied Ceramic Tech

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“…-La incorporación de partículas muy finas de Al 2 O 3 y Cr 23 C 6 en recubrimientos tipo MCrAlY, puesto que este tipo de material compuesto posee coeficientes de expansión térmica más cercanos a los de los substratos [45] -La introducción de barreras de difusión entre el substrato y el recubrimiento como, por ejemplo, capas de ReNi depositadas por electrodeposición [46] y de hafnio y/o platino, depositadas por PVD [47] . -Nuevos materiales cerámicos para BT con menores conductividades térmicas [48] tales como perovskitas tipo BaNd 2 Ti 3 O 10 [49][50][51] y ABO 3 , A = Sr, Ba, B = Zr y con estructura tipo pirocloro A 2 B 2 O 7 , A = Lantano y otras Tierras Raras, B = Zr) [52 y 53] . -Estudio de la resistencia de los recubrimientos a las condiciones resultantes de la oxicombustión, es decir, la combustión de oxígeno en vez de aire ya que se piensa implantar a para incrementar la eficiencia energética [54] .…”

Section: N Nu Ue Ev Va As S T Te En Nd De En Nc CI Ia As Sunclassified

High temperature corrosion resistant coatings for gas turbine components

Agüero

2007

Rev. metal.

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P Pa al la ab br ra as s c cl la av ve eOxidación. Corrosión. Recubrimientos. Generación eléctrica. Aeronáutica. Turbina.High temperature corrosion resistant coatings for gas turbine components A Ab bs st tr ra ac ct t Hot section gas turbine components are made of superalloys, developed to withstand high temperatures in conditions in which mechanical stresses are high and that require high surface stability. However, during the 50s it became evident that compositions resulting in high mechanical strength for these materials were not compatible with those offering optimal protection from the working environments. The idea of employing protective coatings over materials with high mechanical strength resulted therefore from this situation. Presently, both aeronautic and power generation turbines operate at temperatures within the 900-1400 °C, thanks to these coatings, indispensable for their correct operation. In this work, the principal degradation mechanisms in these operating conditions and the different type of coatings presently employed by the industrial sector are described, beginning by the oldest Ni or Co aluminides, following with the addition of other metals such as Pt, Cr, etc. to the former coatings in order to increase their useful life, continuing with the overlay MCrAlY coatings and finishing with the thermal barrier coating systems. Moreover, the corresponding deposition techniques industrially employed to deposit these coatings are described, and finally, an insight of the latest research lines currently being developed is also included.

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“…Aluminium phosphates can be used as binders and matrices in ceramics, and may also be a promising, oxidation‐resistant alternative material for coating fibres used in ceramic‐matrix composites . Layers of amorphous aluminium phosphate with a stoichiometric excess of aluminium have a dense microstructure which is stable at temperatures up to 1400 °C and are used for the planarization of rough surfaces .…”

Section: Introductionmentioning

confidence: 99%

Coating of Alumina Fibres With Aluminium Phosphate by a Continuous Chemical Vapour Deposition Process

Stöckel

Ebert

Böttcher

et al. 2014

Chemical Vapor Deposition

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We developed aluminium phosphate-coated alumina fibres with significantly improved pull-out properties, which may be suitable for reinforcing advanced inorganic composites qualified for operating temperatures up to 1200°C. Aluminium phosphate layers are generated on the surface of alumina fibres using a continuous chemical vapour deposition (CVD) process: At furnace temperatures between 850°C and 1050°C, within a tube reactor heated by an electrical furnace, the alumina fibres are exposed to gas mixtures of phosphoryl trichloride and oxygen, inducing dense aluminium phosphate layers on the fibre surface. Mini-composites were prepared by embedding the coated fibres into an alumina matrix.

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Investigation of a New Class of Disordered Inorganic Materials

Cited by 7 publications

References 44 publications

Aluminum Phosphate–Mullite Composites for High‐Temperature Radome Applications

Aluminum Phosphate–Mullite Composites for High‐Temperature Radome Applications

High temperature corrosion resistant coatings for gas turbine components

Coating of Alumina Fibres With Aluminium Phosphate by a Continuous Chemical Vapour Deposition Process

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