Refractory Concretes of Chemical Bond with Diverse Aggregates

Hipedinger, Nora Elba; Scian, Alberto N.; Aglietti, E.F.

doi:10.1016/j.mspro.2012.06.057

Cited by 2 publications

(5 citation statements)

References 5 publications

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“…22 Within the scope of this study, these investigations serve as a reference and shall be summarized briefly as follows: The aluminum phosphate acts as a network forming agent by developing a P-cross-linked A survey of the published literature modeling of CMCs has been studied by a n ers. Processes that have been modeled CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltrat of alumina matrix in eight-harness satin has been studied numerically in Ref. [ proaches used in the above work general ing the flow of a high viscosity resin thr and modeling the chemical reactions and during processing.…”

Section: Methodsmentioning

confidence: 99%

“…The diffractograms of the ceramic compositions bonded with water-soluble phosphates (Figures 2-4 A survey of the published literature modeling of CMCs has been studied by a n ers. Processes that have been modeled CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltrat of alumina matrix in eight-harness satin has been studied numerically in Ref. [ proaches used in the above work general ing the flow of a high viscosity resin thr and modeling the chemical reactions and during processing.…”

Section: Ceramics Bonded With Watersoluble Dihydrogen Orthophosphatesmentioning

confidence: 99%

“…[7][8][9]40,41 A survey of the published literature shows that process modeling of CMCs has been studied by a number of researchers. Processes that have been modeled include RMI, 15,16 CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltration. 23 Impregnation of alumina matrix in eight-harness satin Nextel 610 fabric has been studied numerically in Ref.…”

Section: Ceramics Bonded With Watersoluble Dihydrogen Orthophosphatesmentioning

confidence: 99%

“…1,4 Structural phase analyses of phosphate-bonded ceramics are mostly limited to X-ray diffraction analyses, thermal analyses or infrared spectroscopic investigations, which, especially in singular applications, monitor phase transformations only with insufficient accuracy. 14,[16][17][18] Particularly, the Accepted Article formation of amorphous structures during the bonding process of phosphate-bonded Al 2 O 3 -MgAl 2 O 4 ceramics could not be clearly evidenced so far. In principle, solid state Magic Angle Spinning NMR spectroscopy (MAS NMR) is suitable for this purpose, since this method helps to analyse the composition of crystalline and amorphous phosphate structures.…”

Section: Introductionmentioning

confidence: 99%

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Phase development of phosphate‐bonded Al₂O₃‐MgAl₂O₄ high‐temperature ceramics: XRD and solid‐state NMR investigations

et al. 2021

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This article describes investigations on the phase development (T ≤ 1500 °C) of phosphate-bonded Al 2 O 3 -MgAl 2 O 4 high-temperature ceramics by a combination of solid state MAS NMR and X-ray diffraction analyses. The ceramic body was bonded with inorganic hydrogen orthophosphates (Al, Mg, Ca, Zr) with a total binder content of 3 wt.% P 2 O 5 . The binding mechanisms of these phosphate-bonded ceramics could be extensively deduced by analyses of phase developments during hardening, strength development, and hightemperature phase formation at T ≤ 1500 °C: The formation of a network of aluminium phosphate compounds by acid and condensation reactions of the phosphate with the ceramic body is proven to be the active binding process. The binding process is initiated by the formation of active phosphoric acid phosphate phases, which in principle prerequisites water solubility of the binder. Thermal treatment, especially at T ≤ 600 °C, promotes the degree of P-cross-linking of the phosphate structures. In addition to these phosphate-ceramic reactions, it was also possible to identify parallel pure phosphate-phosphate conversions of the initial phosphates (via condensation and polymerisation) without reactions with ceramic components. The contribution of these structures to the binding effect can be estimated to be minor. Only at temperatures of T ≥ 600 °C, these Ca, Mg and Zr phosphates begin to react with the ceramic material to form aluminium phosphates. The phosphate bond has a permanent effect until formation of the ceramic bond (T > 1000 °C). High-temperature phases are usually crystalline PO 4 sintered structures which are formed by reaction with MgAl 2 O 4 .

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Section: Methodsmentioning

confidence: 99%

Section: Ceramics Bonded With Watersoluble Dihydrogen Orthophosphatesmentioning

confidence: 99%

Section: Ceramics Bonded With Watersoluble Dihydrogen Orthophosphatesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phase development of phosphate‐bonded Al₂O₃‐MgAl₂O₄ high‐temperature ceramics: XRD and solid‐state NMR investigations

et al. 2021

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“…The hydraulic bond is created by a hydration of aluminous cement, where the final refractory properties are influenced by total amount of Al 2 O 3 , and it is described in the following article. The phosphate materials (for example magnesia-phosphate) represent the example of the chemical bond, especially due to their high melting point [2]. Composites based on these types of bonds are also know as no-cement castables (NCC) [3].…”

Section: Introductionmentioning

confidence: 99%

Applicability of Carbon Fibres in Refractory Cement Composites

2018

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The main objective of this article is to present the influence of high temperatures on mechanical properties of advanced refractory cement composite reinforced with carbon fibres. The presented material is suitable for industrial applications and can withstand elevated temperatures up to 1000 °C. The action of high temperatures was investigated on two temperature levels 600 °C and 1000 °C and was compared to reference specimens dried at 105 °C. The carbon fibres with flexural strength of 4100MPa were applied in dosage 0.50 %, 0.75% and 1.00% of the total volume. The second investigated modification was mutual ratio between aluminous cement and fine ceramic powder. The influence of high temperatures was investigated by measuring the bulk density, compressive and flexural strength, dynamic modulus of elasticity and fracture energy; all measured on prismatic specimens 40 × 40 × 160 mm. The workability of fresh mixture was limited by the maximum dosage of carbon fibres in 1% of the total volume. Based on the workability and evaluation of residual mechanical properties after temperature loading, the best was found to be the combination of carbon fibres in dosage of 0.75% by volume.

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Refractory Concretes of Chemical Bond with Diverse Aggregates

Cited by 2 publications

References 5 publications

Phase development of phosphate‐bonded Al₂O₃‐MgAl₂O₄ high‐temperature ceramics: XRD and solid‐state NMR investigations

Phase development of phosphate‐bonded Al₂O₃‐MgAl₂O₄ high‐temperature ceramics: XRD and solid‐state NMR investigations

Applicability of Carbon Fibres in Refractory Cement Composites

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Refractory Concretes of Chemical Bond with Diverse Aggregates

Cited by 2 publications

References 5 publications

Phase development of phosphate‐bonded Al2O3‐MgAl2O4 high‐temperature ceramics: XRD and solid‐state NMR investigations

Phase development of phosphate‐bonded Al2O3‐MgAl2O4 high‐temperature ceramics: XRD and solid‐state NMR investigations

Applicability of Carbon Fibres in Refractory Cement Composites

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Phase development of phosphate‐bonded Al₂O₃‐MgAl₂O₄ high‐temperature ceramics: XRD and solid‐state NMR investigations

Phase development of phosphate‐bonded Al₂O₃‐MgAl₂O₄ high‐temperature ceramics: XRD and solid‐state NMR investigations