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  • Trans Tech Publications, Ltd.  (20)
  • Dong, Li Min  (20)
Materialart
Verlag/Herausgeber
  • Trans Tech Publications, Ltd.  (20)
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Sprache
Erscheinungszeitraum
  • 1
    Online-Ressource
    Online-Ressource
    Effects of Presintering Temperature and Heating Rate on the Physical and Mechanical Properties of Alumina-Glass-Composites
    Trans Tech Publications, Ltd. ; 2010
    In:  Advanced Materials Research Vol. 105-106 ( 2010-4), p. 549-552
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 105-106 ( 2010-4), p. 549-552
    Kurzfassung: Objective: To study the effects of presintering temperature and temperature rise speed on the physical and mechanical properties of alumina-glass-composite (AGC). Methods: AGC was prepared respectively under the condition that presintered at 1400°C and 1450°C as well as two kind of temperature rise speed. The properties were measured, including density, thermal expansion coefficient, three-point bending strength, fracture toughness, modulus of elasticity and Vicker’s hardness of AGC. Results: With the increasing of presentering temperature and the temperature rise speed, density of AGC decreased, bending strength, fracture toughness, modulus of elasticity increased markedly. There was no difference between three-point bending strength and fracture toughness of AGC that was made by two temperature rise speed to 1450°C. Bending strength of AGC that was made by lower temperature rise speed to 1400°C was the lowest. The Vicker’s hardness of the 1450°C groups was higher than that of the 1400°C groups. Conclusion: Both presintering temperature and the temperature rise speed can influenced the properties of AGC, but the effect of presintering temperature was the most.
    Materialart: Online-Ressource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.105-106
    DOI: 10.4028/www.scientific.net/AMR.105-106.549
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2010
    ZDB Id: 2265002-7
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Online-Ressource
    Online-Ressource
    Preparation and Characterization of Biodegradable β-TCP-Based Composite Microspheres as Bone Tissue Engineering Scaffolds
    Trans Tech Publications, Ltd. ; 2007
    In:  Key Engineering Materials Vol. 336-338 ( 2007-4), p. 1646-1649
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 336-338 ( 2007-4), p. 1646-1649
    Kurzfassung: Since a small globular particle was first used as support for three-dimensional (3D) growth of anchorage-dependent cells in suspended cultures, a variety of microspheres as tissue engineering scaffolds have been developed. In this paper, β-TCP and chitosan were selected as the components of microspheres due to their biodegradability and osteogenic properties. The biodegradable β-TCP/chitosan composite microspheres were prepared by a solid-in-water-in-oil (s/w/o) emulsion cross-linking method in this paper. The size distribution, surface morphology, and microstructure of the microspheres were evaluated. Scanning electron microscopy revealed that the size of the microspheres with good spherical morphology was distributed in the range of 50~200μm. In vitro immersion experiments were carried out to evaluate the degradability of the microspheres, and the results demonstrated that the chitosan/β-TCP composite microspheres were potential materials as tissue engineering scaffolds for bone repair.
    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.336-338.1646
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2007
    ZDB Id: 2073306-9
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 3
    Online-Ressource
    Online-Ressource
    MicroCT Aided Scaffold Design and Preparation
    Trans Tech Publications, Ltd. ; 2007
    In:  Key Engineering Materials Vol. 336-338 ( 2007-4), p. 1584-1586
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 336-338 ( 2007-4), p. 1584-1586
    Kurzfassung: Bone repair method has run to a new stage of bone tissue engineering. Doctors use bone scaffold to fill bone trauma and expect human regeneration ability to reconstruct bone trauma while bone is degrading. Scaffold is essential to bone tissue engineering. Scaffold should introduce new bone with scaffold’s conduction channel. But it’s still very difficult for scaffold to mimic fine structure of bone. Ideal scaffold should have similar component and microstructure to natural bone, which makes it more biocompatible and better to reconstructed bone. So we forward microCT aided design and preparation to solve this problem. MicroCT outputs both shape and three-dimensional internal density information. Then, we build computer model of scaffold with acquired microstructure. We fabricate scaffold that mimics natural bone by 3D rapid prototype machine.
    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.336-338.1584
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2007
    ZDB Id: 2073306-9
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    Online-Ressource
    Online-Ressource
    Study on the Oxidation Behavior of Ca-α-SiAlON in an Air Stream
    Trans Tech Publications, Ltd. ; 2005
    In:  Materials Science Forum Vol. 475-479 ( 2005-1), p. 1283-1286
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 475-479 ( 2005-1), p. 1283-1286
    Kurzfassung: The oxidation behavior of Ca-α-Sialon composites prepared by using the powders of α-Si3N4, AlN, Al2O3 and CaCO3 as the starting materials has been studied, for the composition Ca0.8Si8.8Al3.2O16N14.4 in the temperature range of 1200 to 1400°C for 24 to 96h in an air stream. The bending strength and weight gain of the samples before and after oxidation experiment were measured, and the phases of surfaces of the samples were examined by XRD, the microstructures of sections and surfaces of the samples were observed by SEM. The results show that the weight gain increased and the bending strength decreased as the oxidation time increased, and the oxidation layers contained bar cristobalite and glass phase at 1200°C, bubbles and glass phase at 1300°C, transparent glassy film and the pores at 1400°C, the phases of oxidation layers consisted of cristobalite, CaAl2Si2O8, and glass phase.
    Materialart: Online-Ressource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.475-479
    DOI: 10.4028/www.scientific.net/MSF.475-479.1283
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2005
    ZDB Id: 2047372-2
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
    Online-Ressource
    Online-Ressource
    Wear Resistance of Nano-ZrO〈sub〉2〈/sub〉 Ceramic for Hip Joint Head Prostheses
    Trans Tech Publications, Ltd. ; 2010
    In:  Advanced Materials Research Vol. 105-106 ( 2010-4), p. 175-178
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 105-106 ( 2010-4), p. 175-178
    Kurzfassung: By using the ring-block friction and wear machine, the friction and wear behavior of nano-ZrO2 ceramic test block against GCr15 steel test ring has been studied. At the same time, friction and wear test of 45# steel block against GCr15 steel ring has also been conducted for comparison. By using self-made test machine for the wear ability of the hip joint, the friction test of nano-ZrO2 ceramic hip joint head against ultra-high molecular weight polyethylene (UHMWPE) acetabulum has been done, the friction test of Co-Cr-Mo alloy hip joint head against UHMWPE acetabulum has also been made for comparison. The results show that the friction factor of nano-ZrO2 ceramic test block against GCr15 steel test ring is less 37.3% than that of 45# steel block against GCr15 steel ring, the wear weight of nano-ZrO2 ceramic test block against GCr15 steel test ring is only 0.76% of that of 45# steel block against GCr15 steel ring. The wear weight of UHMWPE acetabulum against nano-ZrO2 ceramic hip joint head is 61.5% of UHMWPE acetabulum against Co-Cr-Mo alloy hip joint head. This indicates nano-ZrO2 ceramic has good wear resistance property and is the ideal materials for artificial Hip joint head Prostheses.
    Materialart: Online-Ressource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.105-106
    DOI: 10.4028/www.scientific.net/AMR.105-106.175
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2010
    ZDB Id: 2265002-7
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 6
    Online-Ressource
    Online-Ressource
    Structure and Properties of Irradiation Crosslinked UHMWPE
    Trans Tech Publications, Ltd. ; 2014
    In:  Key Engineering Materials Vol. 602-603 ( 2014-3), p. 656-660
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 602-603 ( 2014-3), p. 656-660
    Kurzfassung: Irradiation crosslinking is one of the most important methods to modify UHMWPE, it can effectively improve the hardness, creep resistance and abrasion resistance of this material. In order to eliminate free radical, increase material strength, abrasion resistance and fatigue resistance of creep, this study uses Co60-γ to modify UHMWPE under vacuum atmosphere, with the irradiation dose of 30, 60, 90, 120 Kgy respectively. Its mechanical properties, microstructure, degree of crosslinking and crystallinity are analyzed, the results show that the modified UHMWPEs impact strength decreased, elongation basically remain unchanged, tensile fracture strength and tensile yield strength increased.
    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.602-603.656
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2014
    ZDB Id: 2073306-9
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 7
    Online-Ressource
    Online-Ressource
    Setting Behavior of Fast-Setting Calcium Phosphate Cement with Mineral Phase of Bone
    Trans Tech Publications, Ltd. ; 2007
    In:  Key Engineering Materials Vol. 280-283 ( 2007-2), p. 1567-1570
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 280-283 ( 2007-2), p. 1567-1570
    Kurzfassung: The setting behavior of fast-setting calcium phosphate cement (FSCPC) with mineral phase of bone was investigated to evaluate the possible value of the CPC for medical and dental application. Various aspects of the setting behavior such as setting time, mechanical strength and phase change of cement with time were measured by the Vicat needle method, diametral tensile strength measurement, and quantitative powder X-ray diffraction (XRD) analysis, respectively. The change of microstructure during the setting process was observed by Scanning Electron Microscope (SEM). The setting time of the CPC was 10-15min. As a result of its fast setting, set specimens of FSCPC showed high mechanical strength. Powder XRD analysis revealed faster conversion of FSCPC into HAP. SEM observation showed that the specimens are mainly formed with micropores and crystallites, and the phase composition of the set specimens is mainly low-crystallinity HAP at last.
    Materialart: Online-Ressource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.280-283
    DOI: 10.4028/www.scientific.net/KEM.280-283.1567
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2007
    ZDB Id: 2073306-9
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 8
    Online-Ressource
    Online-Ressource
    Microstructure and Crystallization Behavior of Glasses in the ZrO〈sub〉2〈/sub〉-ZnO-Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉-SiO〈sub〉2〈/sub〉 System
    Trans Tech Publications, Ltd. ; 2007
    In:  Key Engineering Materials Vol. 336-338 ( 2007-4), p. 1590-1592
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 336-338 ( 2007-4), p. 1590-1592
    Kurzfassung: Crystallization behavior of ZrO2-ZnO-Al2O3-SiO2 glass has been studied by differential thermal analysis, X-ray diffraction analysis and scanning electronic microscope. ZrO2 doped in the glass induces the phase separation effectively. The crystal phases obtained are gahnite (ZnAl2O4) and a small amount of ZrO2 phase. SEM photographs show that the crystal phases distribute uniformly in the glass ceramics and the grain sizes of glass ceramics after different heat treatment are less than 60nm.
    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.336-338.1590
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2007
    ZDB Id: 2073306-9
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 9
    Online-Ressource
    Online-Ressource
    Physicochemical and Mechanical Properties of Composite of Chitosan Microspheres/Calcium Phosphate Cement
    Trans Tech Publications, Ltd. ; 2007
    In:  Key Engineering Materials Vol. 336-338 ( 2007-4), p. 1654-1657
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 336-338 ( 2007-4), p. 1654-1657
    Kurzfassung: The aim of this work is to improve the mechanical properties of calcium phosphate bone cement (CPC) by appending chitosan microspheres to CPC base. That chitosan degrades rapidly than bone cement has been proved by previous investigations. Porous CPC has low compressive strength because of the pores in it weakening the structure. Additive chitosan microspheres can improve the mechanical properties by bearing the compress with the CPC base and produce pores after degradation. This study investigates the effect of chitosan microspheres on the setting time, mechanical properties, phase evolution and morphology of CPC. The additive proportion of chitosan microspheres ranges from 0 wt% to 30 wt%. Compared with original CPC, the modified CPC has higher compressive strength, without significantly affecting the chemical properties. The phase composition of the CPC is tested by XRD. The microstructures of CPC are observed using SEM. The final setting times range from 5~15 minutes and can be modulated by using different liquid and powder (L/P) ratio.
    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.336-338.1654
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2007
    ZDB Id: 2073306-9
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 10
    Online-Ressource
    Online-Ressource
    Self-Setting Biphase Porous Calcium Phosphate Cement
    Trans Tech Publications, Ltd. ; 2007
    In:  Key Engineering Materials Vol. 336-338 ( 2007-4), p. 1615-1617
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 336-338 ( 2007-4), p. 1615-1617
    Kurzfassung: This work has achieved a novel self-setting biphase porous calcium phosphate cement (CPC). This biphase porous CPC is mainly formed by α-tricalcium phosphate (α-TCP) and β-tricalcium phosphate (β-TCP). The influence of the weight percent (wt%) of β-TCP of the powder was studied. The setting time is mainly 10-30min, and increasing with the weight percent of β-TCP. Powder ray diffraction (XRD) analysis showed that most α-TCP have turned to low-crystallinized HA after immersed in Simulated Body Fluid (SBF) of 37°C for 7 days. SEM observation showed that the resultants are mainly formed with micropores and microcrystallites, and more micropores turned out in cements with more β-TCP after immersed in SBF for 8 weeks.
    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.336-338.1615
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2007
    ZDB Id: 2073306-9
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
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