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  • 1
    Electronic Resource
    Electronic Resource
    Microstructural Characterization of Al-Zr Alloy with Nano-Sized Grains (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 429-432 
    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 mechanical alloying processes was employed to fabricate Al-4at.%Zr alloy withnano-sized grains and very fine Al3Zr compounds. The phase transformations and the stability ofthe phases formed during mechanical alloying and heat treatment processes were investigated. Thegrain sizes of the alloys immediately after milling and following the subsequent heat treatment at550℃ were 54.2nm and 106.4nm, respectively. Some of Zr atoms were dissolved into the Almatrix and most of them reacted with hydrogen produced by decomposition of PCA(process controlagent) to form ZrH2 during mechanical alloying process. These ZrH2 hydrides decomposedgradually after the heat treatment. Stable Al3Zr with a DO23 structure was formed by heat treatmentat temperature of more than 4500C. The hardness of the Al-4at.%Zr alloy was more than two timeshigher than those of other Al-based alloys
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.429.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Additive Powder on Microstructural Evolution in the Wide-Gap Brazed Region by In Situ High Temperature ESEM (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 535-538 
    Details
    ISSN: 1662-8985
    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 study investigated the characterization of the additive powder on microstructuralevolution during the heating of the powder mixture of additive and filler metal powder by in-situ hightemperature environmental scanning electron microscopy (HT-ESEM) up to 1200ºC. The IN738powder (additive) and BNi-3 powder (filler metal) were used for wide-gap brazing process. A fieldemission gun environmental scanning electron microscope (XL 30 ESEM-FEG, FEI) equipped with a1500ºC hot stage was used for in-situ gaseous secondary electron imaging at high temperature(HT-ESEM image). The melting of filler metal powder initiated at 1224K and was spread on theIN738 additive powder with increasing temperature. After cooling, the IN738 additive powder wasincreased from 75μm to 100μm. It was found that the additive powder added to the wide-gap brazedregion avoided the possibility of directional solidification
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.535.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    High-Temperature Thermal Cyclic Oxidation Behavior of Wide-Gap Brazed IN738 Superalloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 894-897 
    Details
    ISSN: 1662-8985
    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 microstructure and thermal cyclic oxidation resistance of the wide-gap region brazedwith different filler metal powder (BNi-3 and DF 4B) comparing with that of Ni-based IN738 alloywere investigated. The microstructure characterization showed that Cr borides with a blockymorphology were existed in the brazed region in both filler metal powder. The normalized weightgain with cyclic oxidation showed that weight loss of the specimen brazed with BNi-3 filler metaloccurred after 600 cycles. However, the specimen brazed with DF 4B filler metal had no obviousweight loss until 700 cycles. It was observed that the oxidation kinetics of the all oxidized specimensfollowed the quasi-parabolic law, and the oxide layer was mainly composed of NiO, Al2O3 andNiCr2O4
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.894.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation of Caclium Phosphate Paste Composites with Demineralized Bone Matrix (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 803-806 
    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: In this study, we attempted preparation and assessments of composite pastes ofdemineralized bone matrix (DBM) and calcium phosphate cement (CPC). While the composite pastespresented self-setting behavior up to a certain DBM content without significant differences in settingtime, temperature increase and phase transformation, compressive strength and injection capabilitydecreased in general with the DBM content. The DBM particulates were observed to uniformlydisperse in the composite cross-sections, suggesting a new model of bioactive paste with tissueregenerative function
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.803.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Identification of Phases in the Wide-Gap Region Brazed with BNi-3 Filler Metal Powder Using Electron Backscatter Diffraction (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 544-545 (May 2007), p. 355-358 
    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: The phases formed in the wide-gap region brazed with BNi-3 filler metal powder in IN738superalloy were investigated by electron backscatter diffraction (EBSD). The morphology andchemical composition of the phase were investigated by field emission scanning electron microscopy(FESEM) and Auger electron spectroscopy (AES). The wide-gap region brazed with BNi-3 fillermetal had a microstructure consisting of primary Ni3B, binary eutectic of Ni3B-Ni solid solution andternary eutectic of Ni3B-Ni-Ni3Si structure. EBSD pattern analysis revealed that the Ni3B hadorthorhombic structure with lattice parameter of a=0.439, b=0.522 and c=0.662 nm, and the Ni3Siphase had cubic structure with lattice parameter of a=0.350 nm
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.355.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Densification Behavior of Iron Powder during Cold Stepped Compaction (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 257-260 
    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: Densification behavior of iron powder under cold stepped compaction was studied.Experimental data were also obtained for iron powder under cold stepped compaction. Theelastoplastic constitutive equation based on the yield function of Shima and Oyane wasimplemented into a finite element program (ABAQUS) to simulate compaction responses of ironpowder during cold stepped compaction. Finite element results were compared with experimentaldata for densification, deformed geometry and density distribution. The agreement between finiteelement results and experimental data was very good for iron powder. The distributions ofhydrostatic pressure and the Mises stress of iron powder under cold stepped compaction were alsostudied
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.257.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Gelatinization and Liquefaction of Starch with a Heat Stable α-Amylase (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 55 (1990), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Sweet potato and corn starches were gelatinized and liquefied to dextrose equivalent (DE) 10 in a steam-jacketed kettle or in a twin-screw extrusion cooker in a single step process with a heat stable ex-amylase. The time required to gelatinize and liquefy 20% starch slurries in a kettle at 95°C was 45 to 50 sec. Starch powder (10 kg/hr) and water (2-6 kg/hr) were fed to an extrusion cooker to adjust the moisture contents of the starch from 20 to 55% (wet basis) and gelatinized and liquefied to DE 10 at a barrel temperature of 120°C or above with 2 to 3% (w/w) a-amylase added. The optimum conditions for the operation were to feed starch with water to maintain 50% moisture and 2% heat stable a-amylase at a barrel temperature of 120°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1990.tb03938.x
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  • 8
    Electronic Resource
    Electronic Resource
    Probability of the interior six-quark compound states in ^3He and ^3H determined from electron scattering data
    Amsterdam : Elsevier
    Physics Letters B 160 (1985), S. 231-234 
    Details
    ISSN: 0370-2693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0370-2693(85)91316-4
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  • 9
    Electronic Resource
    Electronic Resource
    Wide-Gap Brazing of IN738 and the Bonding Strength Using Ni-Based Filler Metal Powders (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 1449-1452 
    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 microstructure and bonding strength of the wide-gap region brazed with different fillermetal powder (BNi-3 and DF 4B) and various powder mixing ratios of additive powder to filler metalpowder were investigated. The microstructure characterization showed that Cr borides with a blockymorphology were existed in the brazed region in both filler metal powder. The bonding strength of thewide-gap region brazed with 60 wt.% IN738 additive and 40 wt.% DF 4B powder exhibited 92%tensile strength of IN738 superalloy at room temperature. The Cracks in the wide-gap brazed regioninitiated at the intermetallic compound and eutectic structure, and then propagated through them
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.1449.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Alumina–mullite–zirconia composites: Part II Microstructural development and toughening (1997)
    Springer
    Journal of materials science 32 (1997), S. 503-511 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Densification characteristics and fracture toughness of the alumina–mullite–zirconia (AMZ) composites fabricated by the colloidal mixing route were examined. The densification of boehmite–silica–zirconia precursor compacts was characterized by three distinct stages. Stage I was represented by a rapid shrinkage between 1100 and 1300°C and was caused by the viscous flow sintering of the SiO2 component. Stage II was characterized by a temporary cessation of the shrinkage caused by the mullitization. Stage III was represented by a restoration of the shrinkage for temperatures above 1450 °C. The α-Al2O3 seeding facilitated the formation of elongated grains in the AMZ composites, and these elongated grains correspond to α-Al2O3. The toughening caused by the microcrack nucleation was comparable to that by the t → m martensitic transformation and increased with increasing total content of zirconia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018590408443
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