Highly dispersed composite iron-zinc powders obtained by a thermochemical method from oxalates

Kushchevskaya, N. F.; Shvets, T. M.

doi:10.1007/bf02675802

Cited by 6 publications

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“…However, the oxalate route for obtaining silica-doped zirconia nanopowders has not been popular. It is well known that other oxides and mixed oxides systems such as barium titanate, yttrium-doped ceria, neodymium-doped barium cerium oxides and yttrium-barium systems with precise stoichiometry have been produced successfully, using the oxalate process (Ragulya et al, 1997;Higashi et al, 1999;Kuschevskaia, 1998;Van Herle et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of zirconia- and silica-doped zirconia nanopowders by oxalate processing

Chandradass

Han

Bae

2008

Journal of Materials Processing Technology

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of zirconia- and silica-doped zirconia nanopowders by oxalate processing

Chandradass

Han

Bae

2008

Journal of Materials Processing Technology

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“…In the system being studied here such particles may be both catalysts and structure-forming agents. Upon the addition of filler two processes may occur simultaneously: chemical inoculation of filler to the polymer macromolecules and intermolecular plasticization [9]. We have established that by varying the concentration of filler in the system from 10 to 70 mass%, a composite material can be obtained the properties of which correspond to the objective of the present study (Table 1).…”

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confidence: 98%

“…Introduction of a small amount of specific addition agents to such systems makes it possible to signfiicantly vary some of the properties of the composite material that has been developed here [9,15]. Better compatibility of the components is achieved and the variation of their ratio over a sufficiently broad range assures that the composite material will achieve specified properties.…”

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confidence: 99%

“…Regions may form with different ordering of structure elements that are not bound with the polymer interlayer. Here the mobility of the polymer chains is limited, wetting of all the particles of the filler by the polymer is not assured, and loosening of the structure matrix may occur [9][10][11]. A content of filler in the composite material 40-50 mass% should be considered optimal.…”

mentioning

confidence: 99%

“…1b) with 10 mass% the optimal concentration of rubber in the composite material. Chemical interaction between the epoxide and nitrile groups now occurs, leading to an increase in intermolecular interaction [9][10][11]. At a concentration of rubber higher than 10 mass% there occurs intermolecular plasticization which is accompanied by a decrease in intermolecular interaction.…”

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confidence: 99%

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Development of sealing compositions with nanostructure iron-based fillers

Kuschevskaya

Kushchevskii

Oleshko

2006

Powder Metall Met Ceram

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621.762The possibility of utilizing nanopowders of iron and Fe − Co − Ni produced bu a thermochemical method in the fabrication of sealing composition materials is investigated. It is established that such hermetic sealing composition materials function reliably under extremal conditions and guarantee elevated strength of adhesion to the surface of the metal and high corrosion and temperature stability.There is a need today for new methods of fabricating and investigating the properties of nanostructure sealing composition materials as well as improving existing methods. Of particular note in this connection is the regulation of the thermal and chemical stability of the structures that are obtained as well as questions related to the reliability and service life of these composite materials on objects that are to be protected against damage. The efficiency and reliability of a sealing composition material are determined largely by its ability to withstand extremal conditions caused by the external environment and repeated thermocycling in the interval of temperatures from −50 to +50°C. The composite material must possess high corrosion resistance and increased strength of their adhesion with metal.In the course of use (for example, in pipelines), maintenance operations, in particular, to eliminate leakage of gas out of discontinuities (air holes, cracks, microcracks, and other flaws), represent a special difficulty. Such operations are basically carried out through the use of welding, vibratory treatment of welded structures, and ultrasonic impact treatment. In practice, however, these techniques are not always implemented. In such cases the use of sealing compositions (sealants), which function for lengthy periods of time under rigid conditions without the need for additional bonding or preliminary treatment of the bonded surfaces [1], is an extremely promising approach.Therefore, the objective of the present study is to investigate the use of ferromagnetic powder as a nanostructural component in creating sealing compositions that function under extremal conditions (in the interval of temperatures from −50 to +50°C and at a pressure of 6.5 MPa). Analysis of known data and preliminary trials showed that other fillers do not always conform with the requirements imposed on the composite materials that are used to create hermetic sealing of cracks in gas pipelines [2]. Thus, the principal drawbacks with the use of, for example, powders of electrolytic or carbonyl iron as filler for composite material can be seen in their pyrophoricity and corrosion instability at temperatures from −50 to +50°C, the hydrophobicity of the surface (nonwettability of particles by the solvent), and the impossibility of assuring homogeneity of the composition (particle size 1-5 μm).The use of iron oxides with hydrophobic surface of particles as filler similarly does not enable us to produce a composite material capable of functioning under extremal conditions. In certain cases such filling is possible but to assure that the composite mate...

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Kushchevskaya

2000

Powder Metallurgy and Metal Ceramics

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Highly dispersed composite iron-zinc powders obtained by a thermochemical method from oxalates

Cited by 6 publications

References 1 publication

Synthesis and characterization of zirconia- and silica-doped zirconia nanopowders by oxalate processing

Synthesis and characterization of zirconia- and silica-doped zirconia nanopowders by oxalate processing

Development of sealing compositions with nanostructure iron-based fillers

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