The use of barium sulfate in the synthesis of celsian ceramic

Maslennikova, G. N.; Fomina, N. P.; Kharitonov, F. Ya.; Naidenova, G. A.

doi:10.1007/bf00677334

Cited by 4 publications

(5 citation statements)

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“…with high wetting of these powders by non-polar thermoplastic binders. It was indicated in old literature sources8, 9 and observed in established industrial condition (including the authors of the present paper) that the presence of even small amounts of hydroxyl groups on the ceramic surface inhibits the creation of hydrogen bonds between hydrocarbons of the thermoplastic binder systems and oxygen atoms of the crystalline lattice of the solid ceramic phase; this results in the increase of the binder content. Similar results were also obtained later and described by Novak et al 15.…”

Section: Principle Of Low Pressure Injection Moulding Technologymentioning

confidence: 56%

“…The phase composition, structure and morphology of these ceramic powders are defined, in a high extent, by the temperature of synthesis of the ceramic phase. Based on literature data8, 9 and based on practical experience, when the temperature of synthesis is higher (i.e. when the synthesis is completed with notable grain growth in the powders), the specific gravity of the powder is higher with certain morphological features, and generally, lower contents of the liquid phase may be required to obtain slurries with workable parameters.…”

Section: Principle Of Low Pressure Injection Moulding Technologymentioning

confidence: 99%

“…The thermoplastic slurries used for low pressure injection moulding have to be of high homogeneity, and it is one of the important factors that define the yield and consistent properties in mass production conditions 8. 9, 17 It includes high uniformity of the binder distribution, stability of the slurry and absence of air bubbles, and it is defined by maintaining certain technological parameters and utilised processing equipment. Based on practical industrial experience, the homogeneity of the slurries, e.g.…”

Section: Principle Of Low Pressure Injection Moulding Technologymentioning

confidence: 99%

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Low pressure injection moulding mass production technology of complex shape advanced ceramic components

Medvedovski

Peltsman²

2012

Advances in Applied Ceramics

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This paper summarises and reviews the industrial manufacturing experience of ceramic components with custom designed complex shapes using low pressure injection moulding technology during a number of years. This technology is successfully used for manufacturing advanced ceramics with different compositions and for different applications. A production level is achieved with hundreds of pieces/day or week or higher. The major principles of this technology are reviewed based on the extensive processing experience. Some processing features, which affect the quality of ceramics and processing yield, are pointed out, particularly for industrial processing. Semi-and automated equipment for low pressure injection moulding technology providing high productivity are described.

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Section: Principle Of Low Pressure Injection Moulding Technologymentioning

confidence: 56%

Section: Principle Of Low Pressure Injection Moulding Technologymentioning

confidence: 99%

Section: Principle Of Low Pressure Injection Moulding Technologymentioning

confidence: 99%

See 1 more Smart Citation

Low pressure injection moulding mass production technology of complex shape advanced ceramic components

Medvedovski

Peltsman²

2012

Advances in Applied Ceramics

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“…(The Gibbs free energy of formation of celsian was obtained from Ref. 96; the Gibbs free energies of formation for other compounds were obtained from Ref. 89.)…”

Section: Discussionmentioning

confidence: 99%

Synthesis of Celsian (BaAl₂Si₂O₈) from Solid Ba‐Al‐Al₂O₃‐SiO₂ Precursors: I, XRD and SEM/EDX Analyses of Phase Evolution

Allameh

Sandhage

1997

Journal of the American Ceramic Society

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An intimate Ba-Al-Al 2 O 3 -SiO 2 powder mixture, produced by high-energy milling, was pressed to 3 mm thick cylinders (10 mm diameter) and hexagonal plates (6 mm edgeto-edge width). Heat treatments conducted from 300°to 1650°C in pure oxygen or air were used to transform these solid-metal/oxide precursors into BaAl 2 Si 2 O 8 . Barium oxidation was completed, and a binary silicate compound, J ournal 3109 Prior work has revealed that novel reaction paths to Ba-CeO 3 , 62 BaFe 12 O 19 , 66 BaTiO 3 , 67,68 and YBa 2 Cu 3 O y 64 can be accessed by the oxidation of solid, alkaline-earth-metal-bearing precursors. The purpose of the present paper is to identify the reaction path(s) to celsian from a Ba-Al-Al 2 O 3 -SiO 2 precursor. Knowledge of the reaction path to celsian is considered an important first step in the processing of celsian-based composites. Before discussing the results of such work, prior analyses of phase evolution to celsian from mixed salt and metallic precursors is reviewed. II. Reaction Paths to Celsian (1) Mixed Salt PrecursorsSeveral authors have examined the formation of celsian from powder mixtures containing BaCO 3 and kaolin. [39][40][41][42][43]49 Heating such precursors at 6°-10°C/min in the temperature range ∼400°-665°C results in appreciable weight loss because of the dehydroxylation of kaolinite. 40,42,49 Weight-loss measurements also have indicated the onset of BaCO 3 decomposition above ∼600°C. 40,42,49 Further annealing in the temperature range 650°-800°C has yielded an amorphous oxide. 2,[41][42][43]49 Hexacelsian had been reported to form during annealing at Ն825°C, whereas the onset of monoclinic celsian formation has required further heat treatment at ∼1130°-1200°C. 2,39,[41][42][43]49 Based on infrared spectroscopy and X-ray diffraction (XRD) analyses, Planz and Muller-Hesse 39 have reported that the loss of H 2 O from kaolin leads to the formation of the metakaolin structure described by Brindley and Nakahira, 81 in which a layer of corner-sharing and edge-sharing AlO 4 tetrahedra is joined to a layer of SiO 4 tetrahedra. This metakaolin precursor is believed to yield an ordered form of hexacelsian with a layer of cornersharing AlO 4 tetrahedra joined to a layer of SiO 4 tetrahedra (as opposed to a ␤-hexacelsian structure with aluminum and silicon distributed in a more random fashion within a double layer of corner-sharing tetrahedra 33 ).

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“…7-15 BaAl 2 Si 2 O 8 is also reported to be chemically compatible with Si 3 N 4 at elevated temperatures in nonoxidizing atmospheres. [17][18][19]24,[26][27][28][33][34][35][36][37][38] A shaped celsian green body can be produced by blending celsian powder with a malleable organic binder and then deforming the mixture into a desired shape by extrusion, forging, or pressing. [23][24][25][26] Modest and thermally stable values of dielectric permittivity and loss at high frequencies also make monoclinic celsian attractive for use in radomes and other electromagnetic devices.…”

Section: Introductionmentioning

confidence: 99%

The oxidative transformation of solid, barium-metal-bearing precursors into monolithic celsian with a retention of shape, dimensions, and relative density

Allameh

Sandhage

1998

J. Mater. Res.

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precursors into monolithic, monoclinic celsian has been examined. The relative amounts of metal and oxide in each type of precursor were adjusted so that the overall stoichiometry and molar volume were similar to those of the desired product, celsian. Metal 1 oxide mixtures were mechanically alloyed and then uniaxially pressed to yield 84-92% dense precursor disks. The precursors were converted into celsian by exposure to a series of heat treatments from 300-1500 ± C in oxygen-bearing gases. Differences and similarities in the phase evolution of the various precursors are discussed. Celsian disks were produced that retained the precursor shape, dimensions, and relative (% theoretical) density. et al.: The oxidative transformation of solid, barium-metal-bearing precursors into monolithic celsian

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The use of barium sulfate in the synthesis of celsian ceramic

Cited by 4 publications

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Low pressure injection moulding mass production technology of complex shape advanced ceramic components

Low pressure injection moulding mass production technology of complex shape advanced ceramic components

Synthesis of Celsian (BaAl₂Si₂O₈) from Solid Ba‐Al‐Al₂O₃‐SiO₂ Precursors: I, XRD and SEM/EDX Analyses of Phase Evolution

The oxidative transformation of solid, barium-metal-bearing precursors into monolithic celsian with a retention of shape, dimensions, and relative density

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The use of barium sulfate in the synthesis of celsian ceramic

Cited by 4 publications

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Low pressure injection moulding mass production technology of complex shape advanced ceramic components

Low pressure injection moulding mass production technology of complex shape advanced ceramic components

Synthesis of Celsian (BaAl2Si2O8) from Solid Ba‐Al‐Al2O3‐SiO2 Precursors: I, XRD and SEM/EDX Analyses of Phase Evolution

The oxidative transformation of solid, barium-metal-bearing precursors into monolithic celsian with a retention of shape, dimensions, and relative density

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Synthesis of Celsian (BaAl₂Si₂O₈) from Solid Ba‐Al‐Al₂O₃‐SiO₂ Precursors: I, XRD and SEM/EDX Analyses of Phase Evolution