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M Drak - One of the best experts on this subject based on the ideXlab platform.

  • properties of composite materials with polymer matrix reinforced with nd fe b hard magnetic particles
    Journal of Materials Processing Technology, 2006
    Co-Authors: L A Dobrzanski, M Drak
    Abstract:

    Abstract Investigation results of the polymer matrix hard magnetic composite materials with nanostructured particles of the powdered rapid quenched Nd–Fe–B strip are presented at this paper. The Nd–Fe–B powder was mixed with powders of iron, aluminum, CuSn10 casting copper Alloy with tin, High-Alloy X2CrNiMo17-12-2 Steel. Epoxy resin has been used as the matrix (2.5 wt.%). The composites were unilaterally and uniaxially pressed at room temperature under the pressure of 800–900 MPa and cured afterwards for 2 h at 180 °C. The influence of the kind of addition materials on magnetic and mechanical properties of composite materials was estimated. Investigations of magnetic properties of composite materials show the influence of the addition material. It was found out that addition of soft magnetic material decreases coercive force H cB and slightly reduces remanence B r of composite. Addition of non-magnetic material decreases coercive force H cB and reduces remanence B r . The fact is that employment of an addition of a metal material powder, like iron, aluminum, CuSn10 casting Alloy of copper with tin, as well as of the X2CrNiMo17-12-2 High-Alloy Steel causes the decrease of the magnetic properties of the composite material, yet it improves its mechanical properties. Addition of the iron powder has the biggest effect on improvement of the compressive strength, whereas the X2CrNiMo17-12-2 High-Alloy Steel powder has the most advantageous influence on hardness increase. Influence of corrosive environments (water: 40 °C, 93% of humidity, 96 h and 5%NaCl solution: 35 °C and 6 h) of magnetic and mechanical properties and corrosive resistance of composite materials were established. The best corrosion resistance show composite materials with aluminum powder addition. Corrosive wear of magnets surface is the smaller and decrease with the growth of amount of metallic powder.

  • properties of composite materials with polymer matrix reinforced with nd fe b hard magnetic particles
    Journal of Materials Processing Technology, 2006
    Co-Authors: L A Dobrzanski, M Drak
    Abstract:

    Abstract Investigation results of the polymer matrix hard magnetic composite materials with nanostructured particles of the powdered rapid quenched Nd–Fe–B strip are presented at this paper. The Nd–Fe–B powder was mixed with powders of iron, aluminum, CuSn10 casting copper Alloy with tin, High-Alloy X2CrNiMo17-12-2 Steel. Epoxy resin has been used as the matrix (2.5 wt.%). The composites were unilaterally and uniaxially pressed at room temperature under the pressure of 800–900 MPa and cured afterwards for 2 h at 180 °C. The influence of the kind of addition materials on magnetic and mechanical properties of composite materials was estimated. Investigations of magnetic properties of composite materials show the influence of the addition material. It was found out that addition of soft magnetic material decreases coercive force H cB and slightly reduces remanence B r of composite. Addition of non-magnetic material decreases coercive force H cB and reduces remanence B r . The fact is that employment of an addition of a metal material powder, like iron, aluminum, CuSn10 casting Alloy of copper with tin, as well as of the X2CrNiMo17-12-2 High-Alloy Steel causes the decrease of the magnetic properties of the composite material, yet it improves its mechanical properties. Addition of the iron powder has the biggest effect on improvement of the compressive strength, whereas the X2CrNiMo17-12-2 High-Alloy Steel powder has the most advantageous influence on hardness increase. Influence of corrosive environments (water: 40 °C, 93% of humidity, 96 h and 5%NaCl solution: 35 °C and 6 h) of magnetic and mechanical properties and corrosive resistance of composite materials were established. The best corrosion resistance show composite materials with aluminum powder addition. Corrosive wear of magnets surface is the smaller and decrease with the growth of amount of metallic powder.

  • structure and properties of composite materials with polymer matrix reinforced nd fe b hard magnetic nanostructured particles
    Journal of Materials Processing Technology, 2004
    Co-Authors: L A Dobrzanski, M Drak
    Abstract:

    Abstract Investigation results of the polymer matrix hard magnetic composite materials with nanostructured particles of the powdered rapid quenched Nd–Fe–B strip are presented at this paper. The Nd–Fe–B powder was mixed with powders of iron, aluminum, CuSn10 casting copper Alloy with tin, High-Alloy X2CrNiMo17-12-2 Steel. Epoxy resin has been used as the matrix (2.5 wt.%). The composites were unilaterally and uniaxially pressed at room temperature under the pressure of 800–900 MPa and cured afterwards for 2 h at 180 °C. The influence of the kind of addition materials on magnetic, mechanical and electrical properties of composite materials was estimated. Metallographic examination of powders morphology and the structure of composite materials, EDS and XRD analysis were made. Investigations of magnetic properties of composite materials show the influence of the addition material. It was found out that addition of soft magnetic material decreases coercive force HcB and slightly reduces remanence Br of composite. Addition of non-magnetic material decreases coercive force HcB and reduces remanence Br. The fact is that employment of an addition of a metal material powder, like iron, aluminum, CuSn10 casting Alloy of copper with tin, as well as of the X2CrNiMo17-12-2 High-Alloy Steel causes the decrease of the magnetic properties of the composite material, yet it improves its mechanical properties. Addition of the iron powder has the biggest effect on improvement of the compressive strength, whereas the X2CrNiMo17-12-2 High-Alloy Steel powder has the most advantageous influence on hardness increase. Metallographic examination of the structure reveals uniform distribution of Nd–Fe–B powder in the polymer matrix, grains are irregular elongated in one direction. However, distribution of additions in the polymer matrix is regular, agglomerations of powders of aluminum, and iron have been observed. XRD analysis has identified the hard magnetic phase Nd2Fe14B.

  • structure and properties of composite materials with polymer matrix reinforced nd fe b hard magnetic nanostructured particles
    Journal of Materials Processing Technology, 2004
    Co-Authors: L A Dobrzanski, M Drak
    Abstract:

    Abstract Investigation results of the polymer matrix hard magnetic composite materials with nanostructured particles of the powdered rapid quenched Nd–Fe–B strip are presented at this paper. The Nd–Fe–B powder was mixed with powders of iron, aluminum, CuSn10 casting copper Alloy with tin, High-Alloy X2CrNiMo17-12-2 Steel. Epoxy resin has been used as the matrix (2.5 wt.%). The composites were unilaterally and uniaxially pressed at room temperature under the pressure of 800–900 MPa and cured afterwards for 2 h at 180 °C. The influence of the kind of addition materials on magnetic, mechanical and electrical properties of composite materials was estimated. Metallographic examination of powders morphology and the structure of composite materials, EDS and XRD analysis were made. Investigations of magnetic properties of composite materials show the influence of the addition material. It was found out that addition of soft magnetic material decreases coercive force H cB and slightly reduces remanence B r of composite. Addition of non-magnetic material decreases coercive force H cB and reduces remanence B r . The fact is that employment of an addition of a metal material powder, like iron, aluminum, CuSn10 casting Alloy of copper with tin, as well as of the X2CrNiMo17-12-2 High-Alloy Steel causes the decrease of the magnetic properties of the composite material, yet it improves its mechanical properties. Addition of the iron powder has the biggest effect on improvement of the compressive strength, whereas the X2CrNiMo17-12-2 High-Alloy Steel powder has the most advantageous influence on hardness increase. Metallographic examination of the structure reveals uniform distribution of Nd–Fe–B powder in the polymer matrix, grains are irregular elongated in one direction. However, distribution of additions in the polymer matrix is regular, agglomerations of powders of aluminum, and iron have been observed. XRD analysis has identified the hard magnetic phase Nd 2 Fe 14 B.

L A Dobrzanski - One of the best experts on this subject based on the ideXlab platform.

  • properties of composite materials with polymer matrix reinforced with nd fe b hard magnetic particles
    Journal of Materials Processing Technology, 2006
    Co-Authors: L A Dobrzanski, M Drak
    Abstract:

    Abstract Investigation results of the polymer matrix hard magnetic composite materials with nanostructured particles of the powdered rapid quenched Nd–Fe–B strip are presented at this paper. The Nd–Fe–B powder was mixed with powders of iron, aluminum, CuSn10 casting copper Alloy with tin, High-Alloy X2CrNiMo17-12-2 Steel. Epoxy resin has been used as the matrix (2.5 wt.%). The composites were unilaterally and uniaxially pressed at room temperature under the pressure of 800–900 MPa and cured afterwards for 2 h at 180 °C. The influence of the kind of addition materials on magnetic and mechanical properties of composite materials was estimated. Investigations of magnetic properties of composite materials show the influence of the addition material. It was found out that addition of soft magnetic material decreases coercive force H cB and slightly reduces remanence B r of composite. Addition of non-magnetic material decreases coercive force H cB and reduces remanence B r . The fact is that employment of an addition of a metal material powder, like iron, aluminum, CuSn10 casting Alloy of copper with tin, as well as of the X2CrNiMo17-12-2 High-Alloy Steel causes the decrease of the magnetic properties of the composite material, yet it improves its mechanical properties. Addition of the iron powder has the biggest effect on improvement of the compressive strength, whereas the X2CrNiMo17-12-2 High-Alloy Steel powder has the most advantageous influence on hardness increase. Influence of corrosive environments (water: 40 °C, 93% of humidity, 96 h and 5%NaCl solution: 35 °C and 6 h) of magnetic and mechanical properties and corrosive resistance of composite materials were established. The best corrosion resistance show composite materials with aluminum powder addition. Corrosive wear of magnets surface is the smaller and decrease with the growth of amount of metallic powder.

  • properties of composite materials with polymer matrix reinforced with nd fe b hard magnetic particles
    Journal of Materials Processing Technology, 2006
    Co-Authors: L A Dobrzanski, M Drak
    Abstract:

    Abstract Investigation results of the polymer matrix hard magnetic composite materials with nanostructured particles of the powdered rapid quenched Nd–Fe–B strip are presented at this paper. The Nd–Fe–B powder was mixed with powders of iron, aluminum, CuSn10 casting copper Alloy with tin, High-Alloy X2CrNiMo17-12-2 Steel. Epoxy resin has been used as the matrix (2.5 wt.%). The composites were unilaterally and uniaxially pressed at room temperature under the pressure of 800–900 MPa and cured afterwards for 2 h at 180 °C. The influence of the kind of addition materials on magnetic and mechanical properties of composite materials was estimated. Investigations of magnetic properties of composite materials show the influence of the addition material. It was found out that addition of soft magnetic material decreases coercive force H cB and slightly reduces remanence B r of composite. Addition of non-magnetic material decreases coercive force H cB and reduces remanence B r . The fact is that employment of an addition of a metal material powder, like iron, aluminum, CuSn10 casting Alloy of copper with tin, as well as of the X2CrNiMo17-12-2 High-Alloy Steel causes the decrease of the magnetic properties of the composite material, yet it improves its mechanical properties. Addition of the iron powder has the biggest effect on improvement of the compressive strength, whereas the X2CrNiMo17-12-2 High-Alloy Steel powder has the most advantageous influence on hardness increase. Influence of corrosive environments (water: 40 °C, 93% of humidity, 96 h and 5%NaCl solution: 35 °C and 6 h) of magnetic and mechanical properties and corrosive resistance of composite materials were established. The best corrosion resistance show composite materials with aluminum powder addition. Corrosive wear of magnets surface is the smaller and decrease with the growth of amount of metallic powder.

  • structure and properties of composite materials with polymer matrix reinforced nd fe b hard magnetic nanostructured particles
    Journal of Materials Processing Technology, 2004
    Co-Authors: L A Dobrzanski, M Drak
    Abstract:

    Abstract Investigation results of the polymer matrix hard magnetic composite materials with nanostructured particles of the powdered rapid quenched Nd–Fe–B strip are presented at this paper. The Nd–Fe–B powder was mixed with powders of iron, aluminum, CuSn10 casting copper Alloy with tin, High-Alloy X2CrNiMo17-12-2 Steel. Epoxy resin has been used as the matrix (2.5 wt.%). The composites were unilaterally and uniaxially pressed at room temperature under the pressure of 800–900 MPa and cured afterwards for 2 h at 180 °C. The influence of the kind of addition materials on magnetic, mechanical and electrical properties of composite materials was estimated. Metallographic examination of powders morphology and the structure of composite materials, EDS and XRD analysis were made. Investigations of magnetic properties of composite materials show the influence of the addition material. It was found out that addition of soft magnetic material decreases coercive force HcB and slightly reduces remanence Br of composite. Addition of non-magnetic material decreases coercive force HcB and reduces remanence Br. The fact is that employment of an addition of a metal material powder, like iron, aluminum, CuSn10 casting Alloy of copper with tin, as well as of the X2CrNiMo17-12-2 High-Alloy Steel causes the decrease of the magnetic properties of the composite material, yet it improves its mechanical properties. Addition of the iron powder has the biggest effect on improvement of the compressive strength, whereas the X2CrNiMo17-12-2 High-Alloy Steel powder has the most advantageous influence on hardness increase. Metallographic examination of the structure reveals uniform distribution of Nd–Fe–B powder in the polymer matrix, grains are irregular elongated in one direction. However, distribution of additions in the polymer matrix is regular, agglomerations of powders of aluminum, and iron have been observed. XRD analysis has identified the hard magnetic phase Nd2Fe14B.

  • structure and properties of composite materials with polymer matrix reinforced nd fe b hard magnetic nanostructured particles
    Journal of Materials Processing Technology, 2004
    Co-Authors: L A Dobrzanski, M Drak
    Abstract:

    Abstract Investigation results of the polymer matrix hard magnetic composite materials with nanostructured particles of the powdered rapid quenched Nd–Fe–B strip are presented at this paper. The Nd–Fe–B powder was mixed with powders of iron, aluminum, CuSn10 casting copper Alloy with tin, High-Alloy X2CrNiMo17-12-2 Steel. Epoxy resin has been used as the matrix (2.5 wt.%). The composites were unilaterally and uniaxially pressed at room temperature under the pressure of 800–900 MPa and cured afterwards for 2 h at 180 °C. The influence of the kind of addition materials on magnetic, mechanical and electrical properties of composite materials was estimated. Metallographic examination of powders morphology and the structure of composite materials, EDS and XRD analysis were made. Investigations of magnetic properties of composite materials show the influence of the addition material. It was found out that addition of soft magnetic material decreases coercive force H cB and slightly reduces remanence B r of composite. Addition of non-magnetic material decreases coercive force H cB and reduces remanence B r . The fact is that employment of an addition of a metal material powder, like iron, aluminum, CuSn10 casting Alloy of copper with tin, as well as of the X2CrNiMo17-12-2 High-Alloy Steel causes the decrease of the magnetic properties of the composite material, yet it improves its mechanical properties. Addition of the iron powder has the biggest effect on improvement of the compressive strength, whereas the X2CrNiMo17-12-2 High-Alloy Steel powder has the most advantageous influence on hardness increase. Metallographic examination of the structure reveals uniform distribution of Nd–Fe–B powder in the polymer matrix, grains are irregular elongated in one direction. However, distribution of additions in the polymer matrix is regular, agglomerations of powders of aluminum, and iron have been observed. XRD analysis has identified the hard magnetic phase Nd 2 Fe 14 B.

Volker Sturm - One of the best experts on this subject based on the ideXlab platform.

  • investigation of matrix effects in laser induced breakdown spectroscopy plasmas of High Alloy Steel for matrix and minor elements
    Spectrochimica Acta Part B: Atomic Spectroscopy, 2005
    Co-Authors: Jens Vrenegor, Reinhard Noll, Volker Sturm
    Abstract:

    Abstract High-Alloy Steel samples are analysed using laser-induced breakdown spectroscopy (LIBS). A quantitative analysis is carried out for nine elements (Ni, Cr, Cu, Mo, Si, Ti, Mn, Al, C) comparing the influence of single and double pulse excitation and for two different laser burst energies. The laser-induced plasmas are generated with a Nd:YAG laser operating at the fundamental wavelength. Calibrations are carried out with a set of 21 certified High-Alloy Steel samples including both matrix (concentrations of non-ferrous elements up to 35 wt.%) and minor elements (concentrations up to 6 wt.%). Calibration results are compared by the mean residual deviation. In contrast to papers published so far on LIBS analysis of High-Alloy Steel, the plasma is generated in a sample stand flushed with argon. The plasma emission is detected time-resolved with a Paschen–Runge spectrometer and with an echelle spectrometer. Electron temperatures are determined using up to 21 atomic lines of iron within a spectral range of 273–522 nm. Matrix effects cause mean residual deviations of the calibration curves of 0.02–1 wt.% depending on the analyte, single or double pulse excitation and the irradiated laser burst energy. By use of iterative interelement corrections the mean residual deviations are reduced on average by a factor of about two for matrix and minor elements. For the element Cu this value can be improved by a factor of up to four.

Christina Berger - One of the best experts on this subject based on the ideXlab platform.

  • influence of plasma nitriding and surface roughness on the wear and corrosion resistance of thin films pvd pecvd
    Surface & Coatings Technology, 2008
    Co-Authors: Oliver Durst, Jorg Ellermeier, Christina Berger
    Abstract:

    Abstract The application of PVD coatings on low-Alloy Steels for the protection against wear and corrosion, may allow the substitution of High-Alloy Steel materials, which are used for applications under mechanical-corrosive loads. This could prolong the component lifetime and save costs. A pretreatment method, which may improve the corrosion resistance of PVD coated low-Alloy Steel, is plasma-nitriding of the substrate. So far there were no investigations to quantify the influence of plasma-nitriding on the corrosion behaviour of PVD coated low-Alloy Steel. Hence one objective of this study was to quantify this influence by means of polarisation tests with determination of corrosion potentials and corrosion current densities. Furthermore the influence of plasma-nitriding of the substrate on the wear properties of PVD coated low-Alloy Steel was investigated. Moreover the influence of surface roughness on the corrosion properties of PVD coated low-Alloy Steel was an aim of this study. The investigated PVD coatings were new graded zirconium carbide layers (ZrCg) and graded chromium carbide layers (CrCg). The tests revealed, that Higher roughness leads to worse corrosion protection by the investigated PVD coatings. This can be explained by the number of defects in the layer, which rises with increasing roughness and which allows the penetration of corrosive media to the substrate and thus accelerates corrosion underneath the film. The tests in artificial sea water in accordance with DIN 50905 did not show corrosive attacks on the tested films themselves. Plasma-nitriding of the substrate resulted in significantly Higher corrosion potentials and significantly lower corrosion rates for the PVD coated specimens. The positive influence of plasma-nitriding of the substrate on the wear behaviour has been less pronounced. Only when Higher normal forces were applied, which allowed the counter body to have direct frictional contact with the substrate, the wear was reduced due to plasma-nitriding. In summary, plasma-nitriding of the substrate is beneficial for achieving good corrosion and wear properties for PVD coatings on low-Alloy Steel. However a special focus has to be put on a proper pretreatment of the surface, which has to be as smooth as possible.

Richard E Russo - One of the best experts on this subject based on the ideXlab platform.

  • evaluation of the prediction precision capability of partial least squares regression approach for analysis of High Alloy Steel by laser induced breakdown spectroscopy
    Spectrochimica Acta Part B: Atomic Spectroscopy, 2015
    Co-Authors: Arnab Sarkar, V Karki, Suresh K Aggarwal, Gulab Singh Maurya, Rohit Kumar, Awadhesh Kumar Rai, Xianglei Mao, Richard E Russo
    Abstract:

    Abstract Laser induced breakdown spectroscopy (LIBS) was applied for elemental characterization of High Alloy Steel using partial least squares regression (PLSR) with an objective to evaluate the analytical performance of this multivariate approach. The optimization of the number of principle components for minimizing error in PLSR algorithm was investigated. The effect of different pre-treatment procedures on the raw spectral data before PLSR analysis was evaluated based on several statistical (standard error of prediction, percentage relative error of prediction etc.) parameters. The pre-treatment with “NORM” parameter gave the optimum statistical results. The analytical performance of PLSR model improved by increasing the number of laser pulses accumulated per spectrum as well as by truncating the spectrum to appropriate wavelength region. It was found that the statistical benefit of truncating the spectrum can also be accomplished by increasing the number of laser pulses per accumulation without spectral truncation. The constituents (Co and Mo) present in hundreds of ppm were determined with relative precision of 4–9% (2σ), whereas the major constituents Cr and Ni (present at a few percent levels) were determined with a relative precision of ~ 2%(2σ).