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  • Qiu, Tai  (10)
  • Unbekannt  (10)
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  • Unbekannt  (10)
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  • 1
    Online-Ressource
    Online-Ressource
    Preparation of M-AlN Suspensions for Aqueous Gelcasting
    Trans Tech Publications, Ltd. ; 2012
    In:  Key Engineering Materials Vol. 512-515 ( 2012-6), p. 293-296
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 512-515 ( 2012-6), p. 293-296
    Kurzfassung: M-AlN (surface modified aluminum nitride powder) suspensions for aqueous gelcasting were prepared Using NH4PAA as dispersant. The effects of pH value, NH4PAA amount and solid content on the rheological behavior of M-AlN suspensions were investigated. The results showed that low viscosity M-AlN aqueous suspensions with high solid content up to 55vol.% were obtained under the condition that the amount of NH4PAA was 0.9 wt. % of M-AlN powder, and pH value was about at 6.8. In spite of this, these suspensions still show a viscosity lower than 0.12 Pa•s at 100s-1, suggesting a good fluidity which can satisfy the requirement of gelcasting.
    Materialart: Online-Ressource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.512-515
    DOI: 10.4028/www.scientific.net/KEM.512-515.293
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2012
    ZDB Id: 2073306-9
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    Online-Ressource
  • 2
    Online-Ressource
    Online-Ressource
    In Situ Reactive Synthesis and Phase Stability Investigation in the AlN-SiC System
    Trans Tech Publications, Ltd. ; 2003
    In:  Key Engineering Materials Vol. 247 ( 2003-8), p. 113-116
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 247 ( 2003-8), p. 113-116
    Materialart: Online-Ressource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.247
    DOI: 10.4028/www.scientific.net/KEM.247.113
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2003
    ZDB Id: 2073306-9
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    Online-Ressource
  • 3
    Online-Ressource
    Online-Ressource
    Mechanically Strong and Hierarchical Porous Silica Ceramics via Gelcasting-Lyophilization
    Trans Tech Publications, Ltd. ; 2016
    In:  Key Engineering Materials Vol. 697 ( 2016-7), p. 414-418
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 697 ( 2016-7), p. 414-418
    Kurzfassung: Highly porous silica ceramics were prepared by in-situ gelation of an aqueous suspension with well dispersed silica particles and N’N -dimethylacrylamide (DMAA) monomer, followed by lyophilization and pressureless sintering. The gelcasting process was imparted by polymerization of DMAA. The silica raw materials used in this experiment are the dusts collected from the exhaust fumes of silicon industry. The as-obtained porous silica ceramics had three-dimensional and hierarchical pore structure and the porosity ranged from 75 to 88 % as the sintering temperature varied from 850 to 1050 °C. In addition, the porous silica ceramics appeared to have strong mechanical strength. Compressive strength of the porous silica ceramics was as high as 3.2 MPa even when the porosity was nearly 80%. The gelcasting-lyophilization method was proved to be a novel and promising route for the preparation of highly porous and mechanically strong materials.
    Materialart: Online-Ressource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.697
    DOI: 10.4028/www.scientific.net/KEM.697.414
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2016
    ZDB Id: 2073306-9
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  • 4
    Online-Ressource
    Online-Ressource
    Synthesis of a Novel B〈sub〉3〈/sub〉CN〈sub〉3〈/sub〉 Compound by Pyrolysis of Precursor
    Trans Tech Publications, Ltd. ; 2007
    In:  Key Engineering Materials Vol. 336-338 ( 2007-4), p. 1080-1083
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 336-338 ( 2007-4), p. 1080-1083
    Kurzfassung: An organic precursor was synthesized with C3N6H6 and H3BO3 as raw materials in aqueous solution. A novel amorphous BCN compound was obtained by thermolysis of the precursor at 1900°C in flowing N2 atmosphere. Single crystal X-ray diffraction analysis reveals that the precursor is a supramolecular compound with a formula C3N6H6(H3BO3)2. The pyrolysis product was characterized by XRD, XPS, FTIR, and SEM. XRD results reveal that the pyrolysis product has a turbostratic graphite structure. XPS analysis confirms the formation of nitrogen-rich BCN ternary compound with an approximate composition of B3CN3. Both the deconvoluted XPS spectra and FTIR spectrum indicate that B-N, B-C, and C-N chemical bonds have been established and there is no phase separation of graphite and h-BN occurred, which suggests an atomic-level hybrid of B, C, and N in the compound. SEM images show that the crystal shape of the B3CN3 compound is columnar, which is similar to the precursor.
    Materialart: Online-Ressource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.336-338
    DOI: 10.4028/www.scientific.net/KEM.336-338.1080
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2007
    ZDB Id: 2073306-9
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  • 5
    Online-Ressource
    Online-Ressource
    Solidification Structure Characteristics and Mechanical Properties of (Ag-Cu〈sub〉28〈/sub〉)-25Sn Alloy Ribbons Prepared by Melt Spinning Method
    Trans Tech Publications, Ltd. ; 2011
    In:  Materials Science Forum Vol. 682 ( 2011-3), p. 75-79
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 682 ( 2011-3), p. 75-79
    Kurzfassung: To obtain novel intermediate temperature alloy solders with melting temperature of 400~600°C, (Ag-Cu28)-25Sn alloy ribbons were prepared by high frequency induction melting and melt spinning at different quenching linear speed. The effect of the development of solidification structure on melting properties and microhardness of the ribbons were investigated. The XRD results show that the as-prepared alloy ribbons have the same phase composition as the master alloy, which consists of Ag4Sn and Cu3Sn. With the quenching linear speed increasing, the solidification structures are refined and change from dendritic crystals to uniform granular crystals. As the quenching linear speed increases up to 32.25m/s, the grain size of the alloy ribbon has a distribution ranging from submicron to about 2μm. The DSC results indicate that the melting properties of alloy ribbons strongly depend on the solidification structure, and the melting temperature of alloy ribbons decreases with the quenching linear speed increasing. The lowest liquidus points of the alloy ribbon prepared at linear speed of 32.25m/s are located at 473.6°C and 524.7°C, respectively. The refined solidification structure notably increases the microhardness of the alloy ribbons, and the largest hardness value of 396HV is obtained for the alloy ribbon prepared at linear speed of 32.25m/s, which increases 27.0% compared with the master alloy.
    Materialart: Online-Ressource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.682
    DOI: 10.4028/www.scientific.net/MSF.682.75
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2011
    ZDB Id: 2047372-2
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  • 6
    Online-Ressource
    Online-Ressource
    Phase-Transformation Kinetics of TiO〈sub〉2〈/sub〉 in TiO〈sub〉2〈/sub〉/(O′+β′)-Sialon Multi-Phase Ceramics
    Trans Tech Publications, Ltd. ; 2007
    In:  Key Engineering Materials Vol. 336-338 ( 2007-4), p. 2318-2321
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 336-338 ( 2007-4), p. 2318-2321
    Kurzfassung: TiO2/(O′+β′)-Sialon multiphase ceramics with different phase composition of TiO2 were prepared by pressureless sintering under high-purity N2 atmosphere with (O′+β′)-Sialon powder and nano TiO2 (anatase) powder as raw materials, Yb2O3 or Tb2O3 as additive. For each sample, the weight percentage of anatase in TiO2 was calculated from XRD data and the kinetics of anatase-rutile transformation was investigated, wherein the emphasis was placed on the influence of Yb2O3 and Tb2O3. The results indicate that the added Tb2O3 and Yb2O3 serve the significant function of inhibition and promotion on the phase transformation, and the effects are enhanced and attenuated with increasing additive content, respectively. For the sample without additive, the transformation process follows apparent first-order kinetic model. The addition of Yb2O3 or Tb2O3 results in completely different transformation kinetic law. For the samples with Yb2O3 added, the transformation is an apparent second-order reaction, whereas a unique kinetic model, CA=kt1/2+C, is valid for the samples containing Tb2O3. In the two cases, the effect of the additive content on the transformation can be perfectly reflected by the apparent rate constant.
    Materialart: Online-Ressource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.336-338
    DOI: 10.4028/www.scientific.net/KEM.336-338.2318
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2007
    ZDB Id: 2073306-9
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 7
    Online-Ressource
    Online-Ressource
    Synthesis of Ag-Cu-Sn Nanocrystalline Alloys as Intermediate Temperature Solder by High Energy Ball Milling
    Trans Tech Publications, Ltd. ; 2009
    In:  Advanced Materials Research Vol. 79-82 ( 2009-8), p. 449-452
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 79-82 ( 2009-8), p. 449-452
    Kurzfassung: To obtain intermediate temperature alloy solders with melting temperature of 400~600°C, (Ag-Cu28)-25Sn and (Ag-Cu28)-30Sn alloys were prepared by high energy ball milling. Ag-Cu-Sn nanocrystalline alloys have been obtained after milling for 40h. XRD results show that the (Ag-Cu28)-25Sn alloy consists of Ag4Sn and Cu3Sn, and the (Ag-Cu28)-30Sn alloy contains Ag4Sn, Cu3Sn and Cu6Sn5. The small polydispersed particles with size ranging from 1μm to about 25μm are observed from the (Ag-Cu28)-30Sn alloys milled for 40h by SEM. A large amount of small particles comprised of two or three grains are commonly observed by HRTEM, and average grain size is about 17.50nm. DSC results indicate that the melting points of the (Ag-Cu28)-25Sn and (Ag-Cu28)-30Sn alloys milled for 40h are 548.5°C and 539.3°C, respectively.
    Materialart: Online-Ressource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.79-82
    DOI: 10.4028/www.scientific.net/AMR.79-82.449
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2009
    ZDB Id: 2265002-7
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  • 8
    Online-Ressource
    Online-Ressource
    Effect of CuO-Bi〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 Co-Doping on Microwave Dielectric Properties of Ba〈sub〉4〈/sub〉Sm〈sub〉9.33〈/sub〉Ti〈sub〉18〈/sub〉O〈sub〉54〈/sub〉 Ceramics
    Trans Tech Publications, Ltd. ; 2011
    In:  Advanced Materials Research Vol. 197-198 ( 2011-2), p. 548-551
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 197-198 ( 2011-2), p. 548-551
    Kurzfassung: Ba 4 Sm 9.33 Ti 18 O 54 (BST) ceramics were prepared by conventional solid-state reaction method. The effect of CuO-Bi 2 O 3 co-doping on the sintering behavior and microwave dielectric properties of BST ceramics has been investigated. The results indicated that when the total addition of CuO-Bi 2 O 3 doping agent was 1.0wt%, the sintering temperature of BST ceramics was reduced to 1240°C as a result of liquid-phase sintering effect derived from CuBi 2 O 4 . When the total addition of CuO-Bi 2 O 3 was fixed at 1.0wt%, the microwave dielelctric properties of BST were improved by adjusting the mass percentage of Bi 2 O 3 . With the increase of Bi 2 O 3 amount from 20wt% to 80wt%, the dielectric constant (ε r ) decreased, the quality factor (Q•f) increased and the temperature coefficient of resonant frequency (τ f ) shifted from negative value to positive value. The excellent microwave dielectric properties of ε r =82.51, Q•f=7878GHz and τ f =+6.02ppm/ were obtained for the sample with Bi 2 O 3 amount of 80wt% when sintered at 1240°C for 3h.
    Materialart: Online-Ressource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.197-198
    DOI: 10.4028/www.scientific.net/AMR.197-198.548
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2011
    ZDB Id: 2265002-7
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    Online-Ressource
  • 9
    Online-Ressource
    Online-Ressource
    Synthesis of Nanocrystalline Ag-Cu Supersaturated Solid Solution by Mechanical Alloying
    Trans Tech Publications, Ltd. ; 2010
    In:  Advanced Materials Research Vol. 92 ( 2010-1), p. 271-276
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 92 ( 2010-1), p. 271-276
    Kurzfassung: Nanocrystalline Ag-28Cu supersaturated solid solution is prepared by mechanical alloying (MA) using a planetary ball mill. The mechanical alloyed powders are characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and differential scanning calorimeter (DSC). XRD patterns show that the main peak of Ag-28Cu supersaturated solid solution exists at about 2θ=39° when the milling time is 30h. HRTEM images show that the grain sizes of as-prepared solid solutions have distributions from 10nm to 15nm. The interplanar spacing of (111) plane for fcc Ag-28Cu supersaturated solid solution is about 2.24Å. DSC measurement result indicates that the melting temperature of Ag-28Cu supersaturated solid solution is 783.8°C. The Ag(Cu) supersaturated solid solutions are in metastable state and they will be transformed into Ag-rich phase and Cu-rich phase simultaneously by annealing at 215°C- 415°C.
    Materialart: Online-Ressource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.92
    DOI: 10.4028/www.scientific.net/AMR.92.271
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2010
    ZDB Id: 2265002-7
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  • 10
    Online-Ressource
    Online-Ressource
    〈i〉In Situ〈/i〉 Preparation and Mechanical Properties of (ZrB〈sub〉2〈/sub〉+ZrC)/Zr〈sub〉3〈/sub〉[Al(Si)]〈sub〉4〈/sub〉C〈sub〉6〈/sub〉 Composites
    Trans Tech Publications, Ltd. ; 2014
    In:  Key Engineering Materials Vol. 602-603 ( 2014-3), p. 438-442
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 602-603 ( 2014-3), p. 438-442
    Kurzfassung: Fully dense (ZrB 2 +ZrC)/Zr 3 [Al (Si)] 4 C 6 composites with ZrB 2 content varying from 0 to 15 vol.% and fixed ZrC content of 10 vol.% were successfully prepared by in situ hot-pressing in Ar atmosphere using ZrH 2 , Al, Si, C and B 4 C as raw materials. With the increase of ZrB 2 content, both the bending strength and fracture toughness of the composites increase and then decrease. The synergistic action of ZrB 2 and ZrC as reinforcements shows significant strengthening and toughing effect to the Zr 3 [Al (Si)] 4 C 6 matrix. The composite with 10 vol.% ZrB 2 shows the optimal mechanical properties: 516 MPa for bending strength and 6.52 MPa·m 1/2 for fracture toughness. With the increase of ZrB 2 content, the Vickers hardness of the composites shows a near-linear increase from 15.3 GPa to 16.7 GPa. The strengthening and toughening effect can be ascribed to the unique mechanical properties of ZrB 2 and ZrC reinforcements, the differences in coefficient of thermal expansion and modulus between them and Zr 3 [Al (Si)] 4 C 6 matrix, fine grain strengthening and uniform microstructure derived by the in situ synthesis reaction.
    Materialart: Online-Ressource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.602-603
    DOI: 10.4028/www.scientific.net/KEM.602-603.438
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2014
    ZDB Id: 2073306-9
    Standort Signatur Einschränkungen Verfügbarkeit
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