PREPARATION OF Al₂O₃-CaAl₁₂O₁₉-ZrO₂ COMPOSITE CERAMIC MATERIAL BY THE HYDRATION AND SINTERING OF Ca₇ZrAl₆O₁₈-REACTIVE ALUMINA MIXTURE

Madej, Dominika

doi:10.13168/cs.2016.0004

Cited by 13 publications

(3 citation statements)

References 28 publications

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“…According to both Fleisher [16] and Hill [17], C 4 AH [13][14][15][16][17][18][19] phase decomposes in the temperature range 200-280°C or at a temperature of 250°C, respectively. C 4 A CH 11 and C 2 AH 8 do indeed give DTA peaks in the same temperature range 160-200°C [18]. George [19] reports an endothermic peak due to dehydration of C 2 AH 8 at 170°C.…”

Section: Introductionmentioning

confidence: 99%

“…It is also well known that the hydraulic reactivity of these phases increases with the calcium content of the phase (CaO/Al 2 O 3 molar ratio), and therefore, C 7 A 3 Z shows higher reactivity than mineral phases of CACs. The formation and dehydration of a number of C-A-H-like phases of hydrated Ca 7 ZrAl 6 O 18 were investigated in previous works [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Hydration, carbonation and thermal stability of hydrates in Ca7−xSrxZrAl6O18 cement

Madej

2017

J Therm Anal Calorim

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This paper studies hydration stages and phase transformation mechanism of the Sr 2? -doped calcium zirconium aluminate cement at room temperature. Features of different hydration stages of this cement paste are identified by X-ray diffraction, scanning electron microscopy, differential thermal analysis, thermogravimetric analysis, evolved gas analysis and heat evolution test. It was found that the partial isovalent substitution of Ca 2? for Sr 2? such as Ca 7-x Sr x ZrAl 6 O 18 , with x = 0.3, 0.6, 1.0, reduced the hydraulic reactivity of Ca 7 ZrAl 6 O 18 phase. The course of hydration of mixed oxides of the type 6CaOÁSrOÁ3Al 2 O 3 Á ZrO 2 documented using microcalorimetry was supported by investigations of the solid hydration products. Research showed that the hexagonal hydrates were stable at early and middle curing ages, an indication that including Sr in solid solution could effectively inhibit the conversion from both C 4 AH 13-19 and C 2 AH 8 to C 3 AH 6 and AH 3 . Calcium monocarboaluminate C 4 A CH 11 phases were also found in this system due to the carbonation process of C 4 AH 13 phase. Substitution of Ca 2? ions by Sr 2? ions in hexagonal calcium aluminate hydrates causes structural disorder and then contributes to the broadening of lines in the powder X-ray diffraction patterns of layered structures of metastable hydrates. At later curing ages, the formation of two hydrogarnet phases, one Sr-rich (C,Sr) 3 AH 6 and the other Ca-rich (C,Sr) 3 AH 6 , was proved.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydration, carbonation and thermal stability of hydrates in Ca7−xSrxZrAl6O18 cement

Madej

2017

J Therm Anal Calorim

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“…Integrated circuit substrates must exhibit high thermal conductivity for the timely distribution of heat generated from substrate materials for high-power applications and prevent the burnout of the integrated block at high temperatures [1]. Aluminum oxide (Al 2 O 3 ) exhibits excellent physical and chemical properties, can be produced from a wide source of raw materials, has a comparatively cheap price, and mature processing and manufacturing technology [2]. Thus, it is one of the most commonly used substrate materials in integrated circuits [3].…”

Section: Introductionmentioning

confidence: 99%

EFFECT OF REACTION CONDITIONS ON THE SYNTHESIS OF ULTRAFINE AlN POWDER WITH GLUCOSE AS CARBON SOURCE

Hu¹

2018

Ceramics - Silikaty

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Using aluminum hydroxide (Al(OH) 3 ) and aluminum nitrate (Al(NO 3 ) 3 ·9H 2 O) as aluminum sources and highly active glucose (C 6 H 12 O 6 ) as a carbon source, we synthesized ultrafine AlN powder through carbothermal reduction-nitridation. Then, we explored the effects of aluminum sources, reaction temperature, holding time and other reaction conditions on the phase composition and micromorphology of the synthesized AlN powder. Result showed that AlN powder and different proportions of Al 2 O 3 -AlN composite powder can be prepared by controlling reaction temperature or holding time. Under the conditions of this experiment, Al(OH) 3 more beneficial as an aluminum source for carbothermal reduction-nitridation than Al(NO 3 ) 3 ·9H 2 O. The optimum reaction conditions for the synthesis of single-phase AlN powder with Al(OH) 3 as aluminum source were holding time of 3 h and temperature of 1450°C. The powder sample synthesized under this reaction condition is mainly composed of flaky, short-rod, and irregularly shaped fine particles with sizes ranging from 50 nm to 100 nm.

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Effect of Hydroxyapatite on Sinterability, Mechanical Properties, and Bioactivity of Chemically Synthesized Alumina–Zirconia Composites

Badr,

Reda,

Zawrah

et al. 2024

J. of Materi Eng and Perform

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PREPARATION OF Al₂O₃-CaAl₁₂O₁₉-ZrO₂ COMPOSITE CERAMIC MATERIAL BY THE HYDRATION AND SINTERING OF Ca₇ZrAl₆O₁₈-REACTIVE ALUMINA MIXTURE

Cited by 13 publications

References 28 publications

Hydration, carbonation and thermal stability of hydrates in Ca7−xSrxZrAl6O18 cement

Hydration, carbonation and thermal stability of hydrates in Ca7−xSrxZrAl6O18 cement

EFFECT OF REACTION CONDITIONS ON THE SYNTHESIS OF ULTRAFINE AlN POWDER WITH GLUCOSE AS CARBON SOURCE

Effect of Hydroxyapatite on Sinterability, Mechanical Properties, and Bioactivity of Chemically Synthesized Alumina–Zirconia Composites

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