Ceramic Pigments with Spinel Structure Obtained by Low Temperature Methods

Chavarriaga, E. A.; Jaramillo, L.; Restrepo, Oscar Jaime

doi:10.1002/9781118371305.ch19

Cited by 7 publications

(11 citation statements)

References 8 publications

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“…The mechanism of action of boron oxide, firstly, consists in the formation of the liquid phase (melt) at comparatively low temperatures (Chavarriaga et al , 2012; Minakova et al , 2008). Furthermore, B 2 O 3 acts on the crystal lattice of the pigment components, bringing it into an active state without destruction.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characteristics of aluminate spinel ceramic pigments based on spent aluminium-cobalt-molybdenum catalyst

Zaichuk

Amelina

Hordieiev

et al. 2020

PRT

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Purpose The purpose of this paper is to conduct the directed synthesis of blue-colour aluminate spinel pigments based on spent aluminium–cobalt–molybdenum (ACM) catalyst and to study peculiar features of mineral formation processes and changes in their colour indices depending on composition and firing temperature. Design/methodology/approach Aluminate spinel ceramic pigments with specified colour indices were synthesised by directed formation of their mineral composition and identification of the most rational technological parameters of production. Mineral composition of synthesised pigments was evaluated by X-ray phase analysis. The colour indices of pigments and pigment-containing glaze coatings were studied on the comparator colour. The chemical resistance of pigments was determined by loss of their weight loss after boiling in 1 N hydrochloric acid solution and 1 N sodium hydroxide solution. Findings Peculiar features of formation of the mineral composition of aluminate spinel pigments based on the ACM catalyst were studied. The expediency of using magnesium and zinc oxides in their composition has been proved. It is found that for the formation of stable pigments of intense blue colour, a concentration of cobalt (II) oxide in the amount of 0.5 mol is sufficient, which is 23.1 Wt.%. The colour of such pigments is determined by the ratios of cobalt, magnesium and zinc aluminates, which form a spinel solid solution. Practical implications The use of developed aluminate spinel pigments provides obtaining of high-quality glass coatings of blue colour, in particular, for ceramics. Originality/value Aluminium oxide in the spent ACM catalyst is predominantly in the active form (of amorphous aluminium hydroxide and y-Al2O3). This is a prerequisite for the use of this waste material as a complete substitute for chemically pure Al2O3 in the technology of aluminate spinel pigments and reduction of their firing temperature. Besides, spent ACM catalyst already contains 5 Wt.% of expensive cobalt (II) oxide in the form of stable colour-bearing phase CoAl2O4.

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Section: Resultsmentioning

confidence: 99%

Synthesis and characteristics of aluminate spinel ceramic pigments based on spent aluminium-cobalt-molybdenum catalyst

Zaichuk

Amelina

Hordieiev

et al. 2020

PRT

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“…The authors of [8,9] argue that the introduction of boron oxide into the system leads to the emergence of melt at a relatively low temperature and contributes to the transfer of the crystal structure into an active state, without destroying it.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Patterns in the synthesis processes and the characteristics of silicate-spinal ceramic pigments when introducing mineralizers

Zaichuk

Amelina

Khomenko

et al. 2020

EEJET

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Синтез керамічних пігментів тради ційно здійснюється при високій темпера турі (не нижче 1200 °С). Для її зниження використовують мінералізуючі добавки, які мають різний механізм дії на вихідні компо ненти пігментних шихт. Ефективність дії мінералізаторів визначається їх природою, вмістом, ступенем диспергування в реаген ті, який активується. Отже, пошук най більш ефективних мінералізаторів при син тезі, зокрема, силікатношпінельних кера мічних пігментів має важливе наукове та практичне значення. Досліджено дію різних мінералізуючих добавок (B 2 O 3 , Na 2 B 4 O 7 , Na 2 O, NaF) на про цеси формування кристалофазового складу шлаквмісних керамічних пігментів і зміну їх колірних показників. Встановлена пряма залежність між температурою плавлення мінералізаторів та ефективністю їх впли ву на утворення шпінельних фаз, які висту пають носіями кольору в таких пігментах. Відчутний ефект від введення натрію фто риду, що має найвищу температуру плав лення серед дослідних добавок, досягається в результаті випалу пігментів при темпе ратурі не нижче 1150 °С. Дія натрію окси ду ефективна починаючи з температури 1100 °С. Найбільш доцільно застосовувати борвмісні сполуки. Їх введення дозволяє зни зити температуру випалу шлаквмісних піг ментів до 1050 °С при повному зв'язуван ні вихідних компонентів в шпінельні тверді розчини. Синтезовані при цьому керамічні пігменти забезпечують формування глазур них покриттів, які за якісними показниками не поступаються покриттям, отриманим з додаванням високотемпературних пігмен тів (температура випалу 1200-1250 °С). На утворення силікатних фаз (діопсиду і воластоніту), які не є носіями кольору в дослідних пігментах, ефективну мінералі зуючу дію чинять добавки NaF і B 2 O 3 Ключові слова: керамічні пігменти, міне ралізатори, випал, кристалофазовий склад, колірні показники, глазурні покриття

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“…4 FeCr 2 O 4 pigments were synthesized by various methods such as solid-state reaction 4,5 or other wet chemical methods (precipitation, microemulsion, sol-gel, or Pechini process). 6 One of the methods used to synthesize the pigment is the solution combustion synthesis (SCS) method. Reasons such as high speed, single-step, and the formation of a favorable crystal structure at lower temperatures have been the most important reasons for selection of the SCS.…”

Section: Introductionmentioning

confidence: 99%

“…The most important pigment in this branch to create black to gray color is FeCr 2 O 4 4 . FeCr 2 O 4 pigments were synthesized by various methods such as solid‐state reaction 4,5 or other wet chemical methods (precipitation, microemulsion, sol–gel, or Pechini process) 6 …”

Section: Introductionmentioning

confidence: 99%

Phase transformation of FeCr₂O₄ to (Fe,Cr)₂O₃ solid solution pigment powders: Effect of post‐heating temperature

Paborji

Afarani

Arabi

et al. 2022

Int J Applied Ceramic Tech

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Iron chromite powders were synthesized via solution combustion route using iron(III) nitrate nonahydrate and chromium(III) nitrate nonahydrate as starting materials, as well as glycine–urea, glycine–citric acid, and glycine–ethylene glycol mixtures as fuels. The effect of postheating at different temperatures on the structure, molecular, microstructure, and chromatic properties of powders and tiles colored by in‐glaze powders was studied. The X‐ray diffraction patterns showed that as‐synthesized powders were obtained in crystalline FeCr2O4 phases moreover, postheating of the powders led to d‐space shift and oxidation and formation of (Fe,Cr)2O3 solid solution phase regardless of fuel type. Phase transformation of FeCr2O4 to (Fe,Cr)2O3 solid solution was observed at 500/750°C depending on the dominant phase of as‐synthesized particles. Fourier transform infrared analysis illustrated that the band positions of octahedral M–O and tetrahedral M–O bonds were shifted due to Fe cations movement from their position and lattice shrinkage by increasing of post‐heating temperature. Moreover, scanning electron micrographs showed that Fe0.7Cr1.3O3 semispherical fine particles were formed from porous spongy FeCr2O4 particles due to oxidation and phase transformation during the postheating. Furthermore, chromatic properties of the samples were represented. The color properties of the pigments showed that the formation of brown pigments is provided with the phase transformation from FeCr2O4 to (Fe,Cr)2O3 at a temperature of up to 750°C. Moreover, increasing the color purity to this temperature is related to the removal of residual carbonaceous matters. The chromatic properties of the glazed tiles colored using the pigments showed that postheating between 250 and 500°C led to more brown appearance.

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Ceramic Pigments with Spinel Structure Obtained by Low Temperature Methods

Cited by 7 publications

References 8 publications

Synthesis and characteristics of aluminate spinel ceramic pigments based on spent aluminium-cobalt-molybdenum catalyst

Synthesis and characteristics of aluminate spinel ceramic pigments based on spent aluminium-cobalt-molybdenum catalyst

Patterns in the synthesis processes and the characteristics of silicate-spinal ceramic pigments when introducing mineralizers

Phase transformation of FeCr₂O₄ to (Fe,Cr)₂O₃ solid solution pigment powders: Effect of post‐heating temperature

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Ceramic Pigments with Spinel Structure Obtained by Low Temperature Methods

Cited by 7 publications

References 8 publications

Synthesis and characteristics of aluminate spinel ceramic pigments based on spent aluminium-cobalt-molybdenum catalyst

Synthesis and characteristics of aluminate spinel ceramic pigments based on spent aluminium-cobalt-molybdenum catalyst

Patterns in the synthesis processes and the characteristics of silicate-spinal ceramic pigments when introducing mineralizers

Phase transformation of FeCr2O4 to (Fe,Cr)2O3 solid solution pigment powders: Effect of post‐heating temperature

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Phase transformation of FeCr₂O₄ to (Fe,Cr)₂O₃ solid solution pigment powders: Effect of post‐heating temperature