Efficiency of different compaction methods for corundum-zirconia powders

Annenkov, Yu. M.; Иванов, В. В.; Ивашутенко, А. С.; Kondratyuk, A. A.; Сивков, А. А.

doi:10.1007/s11148-009-9124-9

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…Semidry compression molding, casting from slips, and less frequently, plastic molding are used for molding the semiproducts. Denser and more equidense semiproducts are obtained with methods that reduce the friction between particles (internal friction) and friction between particles and the walls of the molds (external friction): isostatic, ultrasound [2], and magnetic-pulse [3] molding. Preventing the formation of regions of local compacted regions and a dense hollow shell allows making high-density semiproducts.…”

Section: Classification Of Methods Of Fabricating Cnm Nanoparticlesmentioning

confidence: 99%

Introduction of nanomaterials and nanotechnologies in ceramics plants

Belyakov

2010

Glass Ceram

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Section: Classification Of Methods Of Fabricating Cnm Nanoparticlesmentioning

confidence: 99%

Introduction of nanomaterials and nanotechnologies in ceramics plants

Belyakov

2010

Glass Ceram

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Properties of Compacts from Mixtures of Calcium Fluoride Micro- and Nanopowders

et al. 2022

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In this work, compacts from mechanical mixtures of CaF2 micron powder (MCP) with CaF2 nanopowder (NP) additives were produced, with mass ratios of the mixture components ranging from 10:0.125 to 10:1, respectively, using magnetic pulse (MP) and static pressing (SP) methods. The effects of pressure (Pp) and pressing temperature (Tp), concentration and phase composition of the additive on the density and color of compacts were studied, taking into account the properties of the initial components of the mixtures. The evolution of pulsed cathodoluminescence (PCL) spectra and photoluminescence (PL) of compacts from pure powders and their mixtures depending on Pp, Tp and characteristics of initial CaF2 NP was also studied. A new near-infrared (NIR) band associated with fluoride vacancies was discovered with a maximum at ~765 nm in PCL spectra of compacts produced by MP at a temperature of 425 °C. A blue band at 435 nm associated with impurity oxygen vacancies in the CaF2 lattice was found in PL spectra compacts of pure NP and powder mixtures. The density of compacts of pure NP and MCP reached 89% of the theoretical density, and the density of compacts of mixtures did not exceed 78%. The defective structure and phase composition of the CaF2 NP had a decisive effect on the luminescent properties of compacts from mixtures of micro- and nanopowders.

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Electrical Discharge Machining Non-Conductive Ceramics: Combination of Materials

et al. 2020

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One of the promising processing methods for non-conductive structural and functional ceramics based on ZrO2, Al2O3, and Si3N4 systems is electrical discharge machining with the assistance of an auxiliary electrode that can be presented in the form of conductive films with a thickness up to 4–10 µm or nanoparticles - granules, tubes, platelets, multidimensional particles added in the working zone as a free poured powder the proper concentration of which can be provided by ultrasound emission or by dielectric flows or as conductive additives in the structure of nanocomposites. However, the described experimental approaches did not reach the production market and industry. It is related mostly to the chaotic development of the knowledge and non-systematized data in the field when researchers often cannot ground their choice of the material for auxiliary electrodes, assisting powders, or nano additives or they cannot explain the nature of processes that were observed in the working tank during experiments when their results are not correlated to the measured specific electrical conductivity of the electrodes, particles, ceramic workpieces or nanocomposites but depends on something else. The proposed review includes data on the main electrophysical and chemical properties of the components in the presence of heat when the temperature in the interelectrode gap reaches 10,000 °C, and the systematization of data on ceramic pressing methods, including spark plasma sintering, the chemical reactions that occur in the interelectrode gap during sublimation of primary (brass and copper) and auxiliary electrodes made of transition metals Ti, Cr, Co, and carbon, auxiliary electrodes made of metals with low melting point Zn, Ag, Au, Al, assisting powder of oxide ceramics TiO2, CeO2, SnO2, ITO, conductive additives Cu, W, TiC, WC, and components of Al2O3 and Zr2O workpieces in interaction with the dielectric fluid - water and oil/kerosene medium.

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Efficiency of different compaction methods for corundum-zirconia powders

Cited by 3 publications

References 5 publications

Introduction of nanomaterials and nanotechnologies in ceramics plants

Introduction of nanomaterials and nanotechnologies in ceramics plants

Properties of Compacts from Mixtures of Calcium Fluoride Micro- and Nanopowders

Electrical Discharge Machining Non-Conductive Ceramics: Combination of Materials

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