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  • 1
    Electronic Resource
    Electronic Resource
    Preparation of Tungsten Carbide/Stainless Steel Functionally Graded Materials by Pulsed Current Sintering (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 127 (Sept. 2007), p. 179-184 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: In this investigation, functionally graded technique has been applied to prepare tungsten Carbidealloys (WC-Co alloys)-austenitic stainless steel to improve corrosion and wear resistance andreduce their fabrication costs. Two types of specimens were prepared by Pulsed Current Sintering(PCS) method. One is fabricated from WC alloy (WC-20 wt% Co, WC-20 wt% Fe-46Ni) powderand SUS316L stainless steel powder, and is designated “powder / powder process“. The other isfabricated from pre-sintered WC alloy and SUS316L plate, and is designated “bulk / bulk process”.Both types of specimens have four functionally graded layers. Mechanical properties of thesespecimens were evaluated by three points bending test, and microscopy observations were made totheir microstructures. Although the proper bending strength of bulk / bulk process specimen wasobtained, the optimum sintering condition is sensitive to the sintering temperature and functiongraded layers
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.127.179.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    In Situ Observations of Sintering Process during Pulsed Current Sintering of Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉, ZnO and WC Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 541-544 
    Details
    ISSN: 1662-9752
    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: Pulsed Current Sintering (PCS) process possesses some problems that need to beresolved. We, therefore aims at understanding phenomena of PCS process by presenting some basicdata on in situ sintering behavior of PCS. In order to observe in situ sintering behavior of PCS, aspecial graphite mold equipped with thermo couple and electrodes were designed to measure thetemperature, electric current and voltage inside the powder during PCS process. We apply threetypes of raw materials, especially for ZnO (thermoelectric material) as semiconductor, Al2O3 asnon-conductor and WC (Tungsten Carbide) as good conductor. The observation succeeded andsome valuable data were obtained. The results showed that the temperature in the Al2O3 powder is100 K higher than the graphite mold at the temperature of 1473K and ZnO powder is 150 K higherthan the graphite mold at the temperature of 1373K. The electric current and voltage were measuredfor each powder during PCS process. In addition, their electric resistance properties were calculated.The electric resistance showed different behavior
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.541.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Wear Resistance Properties of Tungsten Carbide/Stainless Steel Composite Materials Prepared by Pulsed Current Sintering (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 1573-1576 
    Details
    ISSN: 1662-9752
    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: Austenitic stainless steel has been used as a corrosion resistance material in toughcorrosive circumstance. However, austenitic stainless steel has poor wear resistance property due toits low hardness. Tungsten Carbide alloys (WC) are widely used as tooling materials, because oftheir high hardness and excellent wear resistance property. In this investigation, we apply powdercomposite process to obtain hard layer of Stainless steel. The composite material was fabricatedfrom planetary ball milled WC powder and SUS316L stainless steel powder and sintered by PulsedCurrent Sintering (PCS) method. We also added TiC powder as a hard particle in WC layer.Evaluations of wear properties were performed by pin-on-disk wear testing machine, and aremarkable improvement in wear resistance property was obtained. The weight loss rate of thecomposite was 1/10 of SUS316L. In addition, it was found that TiC hard particle addition has apositive effect on the wear resistance property. EPMA investigation showed good dispersion of WChard phase and TiC hard particle with SUS316L matrix
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.1573.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Reflecting Multi-Layer Coatings by RF Sputtering (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 502 (Dec. 2005), p. 309-314 
    Details
    ISSN: 1662-9752
    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 work is concerned with the proposition of high contrast multi-layer structure for the fabrication of reflecting surface in the visible range. The multi-layer SiO2/Ta2O5 system has superior heat resistance and reflecting properties. Ta2O5 and SiO2 thin films were prepared by RF plasma sputtering in Ar-O2 mixed gas using Ta2O5 and SiO2 target respectively. Secondary ion mass spectroscopy and SEM observation were performed in order to investigate the multi-layer structure. The XRD and XPS analyses were also performed in order to investigate the crystal structure and the chemical state of the films. The optical constants of Ta2O5 single film were investigated by the ellipsometric analysis. Using the Ta2O5 film doped Bi2O3 for a reflecting multi-layer structure improved the reflecting properties and the heat resistance of the multi-layer system because of the high refractive index of the doped film
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.502.309.pdf
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