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  • 1
    Electronic Resource
    Electronic Resource
    Ion neutralization at an ionic crystal surface
    Amsterdam : Elsevier
    Surface Science 317 (1994), S. 269-274 
    Details
    ISSN: 0039-6028
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0039-6028(94)90274-7
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  • 2
    Electronic Resource
    Electronic Resource
    Charge transfer during reflection of ions from a disordered binary alloy surface
    Amsterdam : Elsevier
    Physics Letters A 193 (1994), S. 293-297 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(94)90600-9
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Ceramic Powders on the Reaction Sintering of Ceramic/Metal Mixed Powders (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 783-786 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.783.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of In Situ Formed Spinel Phase on the Mechanical Properties of Zirconia Ceramics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 1573-1576 
    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 reaction-sintered zirconia-alumina and zirconia-spinel ceramics having low firing shrinkagewere prepared from ZrO2(Ca-PSZ)/Al and ZrO2(Baddellyite)/MgAl powder mixtures via theattrition milling and the effect of the characteristics of used raw powders was investigated.Flaky Al powders mixed with coarse Ca-PSZ powders was not effectively comminuted due tolower hardness of zirconia powders. So by using the alumina ball media or coarse Al2O3 powdersrather than Al, the milling efficiency could be much more increased. When fused Ca-PSZ powderwas reaction-sintered with Al at 1550[removed info] for 3 hours, the reaction-sintering and densification weresomewhat difficult because the Ca-PSZ/Al powder mixture was not effectively comminuted. Andthe Ca ion in Ca-PSZ grains diffused into alumina grains during sintering so that the unstabilizationof Ca-PSZ body was occurred which gave the cracks in the specimens.But when MgAl alloy powder was added to monoclinic zirconia, Mg and Al became to oxide atfirst and subsequently converted to spinel(MgAl2O4) during heating and finally unreacted MgOseemed to stabilize the zirconia. The oxides which formed at the oxidation process would have veryfine grain size so that the reaction sintering was more effective to densification and homogeneousmicrostructure. The mechanical properties of reaction-sintered stabilized zirconia/spinel compositewere better than only MgO stabilized zirconia. Sintering behavior in reaction and mechanicalproperties of sintered body were examined, with emphasis on the relations between spinel formationand mechanical properties
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.1573.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Formation of TiO〈sub〉2〈/sub〉 Coating Layer on the Surface Treated Ti Alloys (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 569 (Jan. 2008), p. 177-180 
    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: Pure Titanium alloys are superiorities of biocompatibility, mechanical properties andchemical stability. The biocompatibility of Ti alloy is related to the surface effect.In this study, Ti Alloys were treated by alkali and acid activation process. And through the solcoating layer, biocompatibility were investigated.Consequently, it appeared that the porous layer was generated on the surface of alloy by surfacetreatment and sol coating process. It was found that with surface treatment on Ti alloy, theformation speed of porous was much quicker compared with those ones without treatment.Therefore, the biocompatibility was improved
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.569.177.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Properties of Permeable Concrete Substrate Having Dual Pore Structures (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 569 (Jan. 2008), p. 233-236 
    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: Porous concretes with continuous voids have been gaining more interest as an ecologicalmaterial because of their useful functions such as water permeability and adsorption ability.Especially, to make porous concrete much more environmentalized, micropores play a role of nestfor microorganism and germs to live in. So micropore distribution and the size of microporesespecially open pores are the key point .In this study, the size and distribution of micropores of porous concrete were effected by the AEagents to the cement pastes and then by the treating types, treating times, treating temperatures, andthe vacuum pressure during the treating. And another group specimens were added sodiumbicarbonate and alum. And then physical properties were examined, digital microscope was alsoused to observe the micropores sizes and distributions. Cracks were observed on thecement-aggregate joint when the amount and vacuum pressure increased. And high treatingtemperature shows no good on the bonding of cement paste and aggregate
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.569.233.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Distribution and Shape of the Pores in Water Permeable Concrete (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 544-545 (May 2007), p. 227-230 
    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: Porous concretes with continuous voids have been gaining more interest as an ecologicalmaterial because of their useful functions such as water permeability and adsorption ability. So poresize distribution and the shape of especially open pores are the key point to permeability. In this study,the size and shape of pores of water permeable concrete were primary controlled by the size and shapeof aggregates and secondly by the expanding agents to the cement pastes. 2 types of raw coaseaggregate, type I and type C which mean fabricated by impact crusher and concrusher, were taken intouses and 3 sizes of aggregate were used, namely 3 to 5mm, 5 to 13 mm, and 13 to 20 mm. Thecompressive strength was found to be higher when using impact crushed aggregate. And the smallersize of aggregate was used, the higher compressive strength was achieved
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.227.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Milling and Sintering Behavior of the Metal-Ceramic Mixed Powders (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 93-96 
    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 reaction-sintered alumina ceramics with low firing shrinkage were prepared fromAl/Al2O3 powder mixture by attrition milling and the effect of milling characteristics of rawpowders on reaction sintering was investigated. Powder mixtures of flaky shape Al with coarsealumina was much more effectively comminuted by the attrition milling than the mixtures ofglobular shape Al with coarse alumina powders. Furthermore the coarse alumina was much moreuseful in pulverizing and grinding the ductile Al particles than fine alumina.After attrition milling and isopressing at 400MPa, the Al/Al2O3 specimen was oxidized at 1200℃for 8 hours followed by sintering at 1550℃ for 3 hours. Because mixed powder of coarse aluminawith flaky Al was much more effectively comminuted than the globular Al, sintered body of morethan 97% theoretical density was achieved, but low contents of Al leads to relatively highershrinkage of about 8%. As the coarse alumina particles are much more useful in cutting andreducing the ductile Al particles, the use of the coarse alumina powder was much more effective inreaction-sintering
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.93.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Dissolution of Hydroxyapatite Reinforced Grain Boundary by Glassy Phases (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 31-34 
    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: Several sintering additives for hydroxyapatite have been tested in order to enhance itssinterability without decomposing the hydroxyapatite(Ca10(PO4)6(OH)2) and without decreasing thebioactivity and/or biocompatibility. In case of sintered pure hydroxyapatites significant dissolutionwas occurred after immersion in distilled water or in simulated body fluid. At first the dissolutionwas iniciated at grain boundary creating the nano-size defects such as small pores and grew up tomicro scale by increasing the immersion time. This dissolution resulted in grain separation at thesurfaces and finally in fracture. And the dissolution was concentrated on those grains adjacent topores rather than those in the dense region. So glass-reinforced hydroxyapatite(GR-HA) ceramicswere prepared to strengthening the grain boundary to prevent dissolution. Several glasses wereadded at 0 to 10wt.% and sintered at 1200 ℃ for 2h in air with moisture protection. Glass phasewas incorporated into hydroxyapatite to act as the sintering aids followed by crystallization in orderto improve the mechanical properties without reducing the biocompatibility. From dissolution test,significant damage was reduced even more than 7days. X-ray diffraction and SEM showed nodecomposition of hydroxyapatite to secondary phases and fracture toughness was increased morethan pure hydroxyapatite
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.31.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of Glass Phase on the Defect Formation during the Dissolution of Hydroxyapatite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 637-640 
    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: Particle separations occurred frequently in sintered hydroxyapatite when immersedin distilled water or simulated body fluid. This dissolution initiated at grain boundarycreating nano-size defects such as small pores and grew up to micro scale byincreasing immersion time. The dissolution, probably due to the appearance ofsecondary phases in grain boundary, resulted in grain separation at the surfaces andfinally in degradation and fracture. And the dissolution concentrated on those grainsadjacent to pores rather than those in the dense region.Hydroxyapatite ceramics incorporated with calcium silicate glass were prepared byslip casting to enhance the sinterability as well as to reduce dissolution. Glass phasewas incorporated into hydroxyapatite to act as sintering aids followed bycrystallization in order to improve the mechanical properties without reducingbiocompatibility. From dissolution test, significant damage was reduced even morethan 7 days and the dissolution pattern somewhat changed than pure hydroxyapatite.X-ray diffraction and SEM showed no decomposition of secondary phases in grainboundary and fracture toughness somewhat increased
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.637.pdf
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