Quartz ceramics modified by nanodispersed silica   additive

Khomenko, Olena

doi:10.15407/fm25.03.613

Cited by 13 publications

(5 citation statements)

References 2 publications

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“…An option to overcome these difficulties can be the introduction of additives into the ceramic slip. This approach was used in [18][19][20][21]. In order to prevent crystallization of quartz ceramics during sintering, boron oxide [18], anoxic boron-containing sintering activators [18,19], kaolin [20], nanodispersed silica [21], etc.…”

Section: Materials and Methods For Studying The Effect Of Aluminum Phmentioning

confidence: 99%

Determination of the influence of aluminum phosphate on the properties of quartz ceramics

Karasik

Kozyreva

Dushyn

2021

EEJET

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One of the significant disadvantages of quartz glass-based materials is their tendency to crystallize cristobalite during firing and, as a consequence, a significant deterioration in performance. In order to prevent crystallization of quartz ceramics during sintering, a number of additives are used. However, all known options some disadvantages, namely, relatively low strength values and increased coefficient of linear thermal expansion of products.In this regard, a promising area of research is to study the effect of aluminum phosphate additives on the properties of quartz ceramics. According to the totality of properties, the addition of AlPO4 in an amount of 20 wt % has the most positive effect on the characteristics of quartz ceramics. According to differential thermal analysis, it is noted that up to a temperature of 1,200 °C, no noticeable phase and modification transformations occur in the base mixtures. In the course of the work, it was found that the most appropriate firing mode is as follows: oxidizing medium; the products are immersed in a hot furnace, after being held at the maximum temperature, they are removed from the hot furnace, cooling occurs slowly in the air. The materials obtained in this way are characterized by the following properties: α=31.6·10-7 deg-1; σcomp=153 MPa; P=2.7 %; tgδ and ε (frequency 1010 Hz, temperature 20 °C) 0.001 and 10, respectively. It is noted that the main crystal phase prevailing in the samples is aluminum phosphate. The microstructure of the material is characterized by the presence of a small number of residual pores and a densely sintered shard.The proposed solution will significantly reduce power consumption, improve production performance and increase the basic properties of polyfunctional quartz ceramic products

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Section: Materials and Methods For Studying The Effect Of Aluminum Phmentioning

confidence: 99%

Determination of the influence of aluminum phosphate on the properties of quartz ceramics

Karasik

Kozyreva

Dushyn

2021

EEJET

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“…However, each of them has its advantages and disadvantages [7]. Thus, highly heat-resistant quartz ceramics is limited by the operational temperature of 1,000 °C [7,8]. High-alumina ceramics that demonstrate high strength and resistance to the effects of aggressive environments, have insufficient heat resistance (200 °C) and require high firing temperatures (1,600-1,700 °C) [9].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Subsolidus structure of the ZnO–SrO–Al2O3–SiO2 system as a base for designing radio-transparent ceramics

Fedorenko

Лисачук

Prytkina³

et al. 2020

EEJET

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“…As a result, due to the presence of porosity, the material needs to be sealed for use in a humid environment. In addition, despite various methods aimed at strengthening quartz ceramics, mechanical strength remains relatively low [4,5].…”

Section: Introductionmentioning

confidence: 99%

Determining patterns in the formation of cordierite phase during the synthesis of density-sintered low-temperature ceramics based on glasses of the MgO–Al2O3–SiO2 system

Zaichuk

Amelina

Kalishenko

et al. 2022

EEJET

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The search for effective modifiers of the structure of densely baked cordierite ceramics to reduce the firing temperature is a relevant task but typically requires a large amount of experimental research. The object of this study is the reaction of the formation of the cordierite phase with the participation of glass components of the eutectic compositions of the MgO– Al2O3–SiO2 system under low-temperature firing conditions. In this case, thermodynamic analysis was used as a tool to assess the probability of chemical reactions. Thermodynamic analysis can significantly reduce the volume of the experimental sample. This paper reports the results of theoretical and experimental studies into the features of the course of chemical reactions with the participation of glass components of eutectic compositions of the MgO–Al2O3–SiO2 system. It was revealed that once the stoichiometric ratio is maintained, the resulting product of the interaction between the components of eutectic glasses of the MgO–Al2O3–SiO2 system with charging components is cordierite. Changes in the mineralogical composition of cordierite compositions depending on the firing temperature have been determined. The formation of the cordierite phase is preceded by the process of transformation of meta kaolinite Al2O3·2SiO2, which is a product of kaolin dehydration, into mullite 3Al2O3·2SiO2. Subsequently, the formation of cordierite (in addition to crystallizing directly from eutectic glasses) occurs with the participation of the mullite phase. The formation of the cordierite phase occurs in several stages and is completed at a temperature of 1300 °C. The established features of the reactions of cordierite formation make it possible to determine the most optimal compositions for glasses of the MgO–Al2O3–SiO2 system to obtain low-temperature cordierite ceramics with a high degree of sintering. At the same time, it is also possible to control the phase composition of ceramics and its properties

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Quartz ceramics modified by nanodispersed silica additive

Cited by 13 publications

References 2 publications

Determination of the influence of aluminum phosphate on the properties of quartz ceramics

Determination of the influence of aluminum phosphate on the properties of quartz ceramics

Subsolidus structure of the ZnO–SrO–Al2O3–SiO2 system as a base for designing radio-transparent ceramics

Determining patterns in the formation of cordierite phase during the synthesis of density-sintered low-temperature ceramics based on glasses of the MgO–Al2O3–SiO2 system

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