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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic Properties of a Novel Ceramic Ferroelectric–Ferromagnetic Composite (2005)
    Malden, USA : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A series of [0.8Pb(Ni1/3Nb2/3)O3–0.2PbTiO3]/[(Ni0.2Cu0.2 Zn0.6)Fe2O4] (PNNT/NiCuZn) ferroelectric–ferromagnetic composites were prepared by the conventional solid-state route. The composites show good co-firing behaviors. X-ray diffraction and scanning electron microscope studies confirmed the coexistence of ferroelectric PNNT phase and ferromagnetic NiCuZn phase in the composites. No significant chemical interaction has occurred between PNNT phase and NiCuZn phase. All sintered samples exhibit typical magnetic hysteresis loops at room temperature. The saturation magnetization of composites rises linearly with the increase in NiCuZn content. Frequency dependence of initial permeability was also measured. With an increase in NiCuZn, the initial permeability increases and the cutoff frequency tends to decrease. The Maxwell–Garnett (MG) effective medium theory was used to model the magnetic properties of composites. Although the MG equation cannot give an accurate prediction for the initial permeability of composites because of the oversimplified assumption, it gives upper and lower limits for the initial permeability of compositions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00633.x
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  • 2
    Electronic Resource
    Electronic Resource
    The Effect of Sr Substitution on Phase Formation and Magnetic Properties of Y-type Hexagonal Ferrite (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The effect of Sr substitution in Y-type hexagonal ferrite of composition Ba2–xSrxZn1.2Co0.4Cu0.4Fe12O22 was investigated. x varied from 0 to 2.0. The samples were prepared by the solid-state reaction method. Phase formation was characterized by powder X-ray diffraction. The microstructure was observed via scanning electron microscopy and magnetic properties were measured using an impedance analyzer and vibrating sample magnetometer (VSM). Results reveal that Sr2+ cannot completely substitute for Ba2+ ions in Y-type hexagonal ferrites. The maximum solubility of Sr in the Y-type ferrite is about 1.8. With Sr above 1.8, the lattice mismatch induced by the difference in ionic radii of Ba2+ and Sr2+ ions prevents the formation of Y-type phase. While Sr content is equal or less than 1.0, the magnetic properties may be enhanced. As x〉1.0, because of the internal stress resulting from the lattice mismatch, demagnetizing field significantly degrades initial permeability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00080.x
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  • 3
    Electronic Resource
    Electronic Resource
    Fabricating Metal Patterned Ceramic Substance by Tape-Casting (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 757-758 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Tape-casting technology is introduced to fabricate metal-arrayes patterned ceramic substance containing periodic multilayer silver wire structure in the low dielectric constant ceramic matrix for microvave bandgap materials and left hand material application. One important advantage of the metal patterned ceramic substance comparing with the periodic structures fabricated on the printed circuit boards (PCB) using a shadow mask/etching technique is that complex multilayer structure can be designed and fabricated in the ceramic body as well as on the surface by the tape-casting process, while the shadow mask/etching technique technology can only design patterns on the surface of printed circuitboards. An Hp8720ES network analyzer was used to measure the transmission properties of the metal patterned ceramic substance. The experimental result shows some novel properties at X-band microwave frequencies. The metal patterned ceramic substance can be used in the microwave communication, such asmicrowave antenna
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.757.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Investigation on the Numerical Simulation for the Dynamic Transition from Liquid to Solid during Liquid-Solid Extruding Forming (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 116-117 (Oct. 2006), p. 573-577 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The numerical simulation of liquid-solid extruding is completed with ABAQUS code inthis paper. The hydrostatic fluid element is used to simulate the deformation of liquid phase and thecontinuum element is used to the solidified layer. The combination of fluid element and continuumelement avoids the mesh distortion of liquid phase during extruding. The dynamic transition fromliquid to solid is implemented by sequential coupled thermal-mechanical analysis. One illustratedexample of liquid-solid extruding is presented in this paper at last to show the whole modelingprocess of the dynamic transition from liquid to solid in detail
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.573.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Fabrication of C〈sub〉sf〈/sub〉/Mg Composites Using Extrusion Directly Following Vacuum Infiltration - Part 2: Forming Process Study (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 91-96 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Extrusion directly following vacuum infiltration is a special forming technique thatcombines the advantages of liquid metal infiltration and semisolid extrusion. The major advantages ofthis process are elimination of porosity and shrinkage, good surface finish, good dimensionalaccuracy, high strength to weight ratio and near net shaping. Magnesium matrix composites arefabricated usually through stirring casting, powder forming, injecting deposition, liquid metalinfiltration or die casting at present time. However few investigations on magnesium matrixcomposite are conducted for the specific characteristics of magnesium alloy, such as high chemicalactivity and easy oxidation. The present paper is focused on Csf/Mg composites obtained viainfiltration of porous short carbon fiber preform by liquid Magnesium. The complete experimentsetup is designed and fabricated by ourselves, which include the forming molds, the unit for meltingthe magnesium, the unit for vacuuming and the monitoring and collecting system of forming processparameters. In this method the whole experiment setup is vacuumed firstly. Then the pressurizednitrogen is used to infiltrate the magnesium melt through a porous preform of short carbon fibers.After the infiltration completed, the punch of the press extrude the magnesium-infiltrated preform outof the forming die to form the tubes or bars. X-ray diffraction (XRD), optical and SEM microscopeswere used to characterize the infiltration and the microstructure of fabricated composites. Thecompression test was used to characterize the mechanical properties of fabricated composites. Theresults show that the preform was infiltrated thoroughly by melt magnesium and the fabricated Csf/Mgcomposites have excellent mechanical properties compared with the magnesium alloys. Csf/Mgcomposites should be very promising candidates for automobile parts and portable electronicappliance parts in the future
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.91.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Fabrication of C〈sub〉sf〈/sub〉/Mg Composites Using Extrusion Directly Following Vacuum Infiltration - Part 1: Monitoring and Acquiring of Process Parameters (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 85-89 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Many process parameters are involved during the fabrication of Csf/Mg composites usingextrusion directly following vacuum infiltration. The selection of suitable process parameters isimportant for the successful fabrication of composites. This will require a continuous monitoring andcollecting system of process parameters. This paper describes how this is performed. The monitoringand collecting system is developed to monitor and control the forming process successfully. Thehardware was built with data acquisition (DAQ) card based on PCI and various sensors fortemperature, pressure, displacement. The industrial computer is used to process the data collectedfrom the sensors. The data acquisition card is the bridge between the computer and sensors. In order toreduce the signal noise from sensors, the hardware filter circuit is designed. The data acquisition cardcan not work by connecting the computer and sensors through it simply. It must be operated throughthe self-developed software. The data colletcing software is developed in this paper. It can realize theparameter monitoring and collecting easily by setting up the hardware through the user friendlyinterface. The curves of parameters can be displayed on the computer screen and the data can be savedinto the database for post-processing. The software also supplies the warning function. When theparameters (for example the temperature of mold) arrives the set value, the computer can sound a noteof warning to tell the worker to operate the press. It is demonstrated that the main parameters, such astemperature of mold and liquid metal, the loaded pressure and the displacement of punch, can bemonitored and collected in real-time by use of this system. This paper found the base for the furtherselection of optimized process parameters
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.85.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    A New Integration Method Proposed for Hyperbolic Sine Constitutive Equation Used in Semi-Solid Forming (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 116-117 (Oct. 2006), p. 578-582 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: This paper describes a new integration algorithm for hyperbolic sine constitutive equation(HSCE) used in semi-solid forming. An intermediate variable Lambda ranged from zero to one isintroduced to replace the inelastic strain rate in HSCE so that the inelastic strain rate can be solvedindirectly from the Lambda. The proposed integration algorithm is based on the stress update conceptand the effect of normal stress updating on the material compression is also discussed thoroughly inthis paper. The investigation results show that the new algorithm can integrate the HSCE efficientlyand the normal stress should keep constant as the deviatoric stress updating. An example ofsemi-solid extruding was given in the paper at last to illustrate the implementation of new algorithmand effect of normal stress updating on the compression of material
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.578.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation of Transparent AlON Ceramics Using Powder Synthesized from Nano-Sized Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 and AlN (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 447-449 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The single-phase AlON powder used to prepare transparent ceramics was synthesized fromsolid-state-reaction using nano-sized Al2O3 and AlN powders with high purity. An appropriate amount ofthe powder was molded into pellets and isostatically pressed using polyvinyl alcohol as the binder. TheAlON ceramic samples were obtained by sintering the pellets at 1880°C for 10 h, 20 h and 40 h,respectively. The transparency of the samples increased as the temperature holding time was prolonged.The density, phase compositions and microstructures of the sintered samples were discussed in detail
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.447.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    A Terminal Sliding Mode Tracking Control Algorithm for Mobile Robots (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 375-376 (Mar. 2008), p. 588-592 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper presents a new trajectory tracking control algorithm to uncertain mobile robotwith nonholonomic constraints. This algorithm is based on the non-singular terminal sliding modetechnique, which can eliminate the singularity problem caused by conventional terminal slidingmode control. The system state vector is designed using backstepping method, this method breaksdown nonlinear systems into low dimensional systems and simplifies the controller design. Bycombining Lyapunov method, it is proved that under this control law, the pose errors converge tozero, the mobile robot can track the desired trajectory when the desired velocity satisfies someassumptions. Simulation results validate the theoretical analysis
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.375-376.588.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    A New Method for the Preparation of Transparent AlON Ceramic (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 441-443 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Transparent AlON ceramics are prepared with single-phase AlON powder synthesized frommicron-sized aluminum and nano-sized alumina. The ceramics are prepared through sintering at thetemperature of 1880°C for 10, 20 and 40 hours in flowing-nitrogen atmosphere, respectively. The effectsof powder and temperature holding-time on transparent ceramic preparation and microstructure andtransparency are investigated. The results show that all samples are transparent and of a single-phaseAlON and, with increasing holding-time, the average pore size and porosity decreases and consequently,the ceramics are dense and their transparency is improved
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.441.pdf
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