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  • Trans Tech Publications, Ltd.  (4)
  • Wang, Yan Yan  (4)
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  • Trans Tech Publications, Ltd.  (4)
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  • 1
    Online Resource
    Online Resource
    Preparation and Properties of NZP Family Ceramics
    Trans Tech Publications, Ltd. ; 2018
    In:  Solid State Phenomena Vol. 281 ( 2018-8), p. 450-455
    Details
    In: Solid State Phenomena, Trans Tech Publications, Ltd., Vol. 281 ( 2018-8), p. 450-455
    Abstract: The matrix of NZP family ceramics is natrium phosphate zirconium (for short, NZP) . NZP family ceramics have the designabolity of thermal expansion coefficient, and the average thermal expansion coefficient can be changed from negative value to positive value by means of composition adjustment, thus obtaining zero thermal expansion ceramics with good thermal shock resistance. With NZP family ceramics the thermal stress can be effectively reduced and the thermal properties of materials can be enhanced.Therefore, NZP family ceramics have become a hot topic in materials science community in recent years.The calcium phosphate zirconium powder was prepared by coprecipitation method, and NZP family ceramics were prepared after pressing molding and pressureless sintering. The results show that the compressive strength of the prepared NZP family ceramics is 199 MPa and the thermal expansion coefficient is-0.5×10 -6 /°C at sintering temperature of 1100°C.
    Type of Medium: Online Resource
    ISSN: 1662-9779
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/SSP.281
    DOI: 10.4028/www.scientific.net/SSP.281.450
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2018
    detail.hit.zdb_id: 2051138-3
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Study on the Gel Casting Process of Silicon Carbide
    Trans Tech Publications, Ltd. ; 2016
    In:  Key Engineering Materials Vol. 697 ( 2016-7), p. 138-142
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 697 ( 2016-7), p. 138-142
    Abstract: Silicon carbide possess high performances such as high hardness and strength, oxidation and high temperature resistance, high thermal conductivity and low thermal expansion coefficient. Widely used methods of molding green body for sintered pressureless bonded silicon carbide comprise dry pressing molding and casting molding. The former fails in preparation of complex shapes, while those prepared by casting molding are prone to have defects such as nonuniformity of density and easy cracking. Gel-casting is a net-shape modeling technology caused by the polymerization of organic monomer (acrylamide). The green bodies molded by gel-casting have uniform structure, high density, high strength and machinability. In this study, gel casting molding and pressureless sintering were used to prepare silicon carbide. The effect of the parameters of gel casting and sintering on the microstructure of the obtained silicon carbide was examined
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.697
    DOI: 10.4028/www.scientific.net/KEM.697.138
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2016
    detail.hit.zdb_id: 2073306-9
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  • 3
    Online Resource
    Online Resource
    The Effect of Different Preparation Methods on the Microstructure of Zirconium Diboride Ceramic Powder
    Trans Tech Publications, Ltd. ; 2012
    In:  Advanced Materials Research Vol. 624 ( 2012-12), p. 9-12
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 624 ( 2012-12), p. 9-12
    Abstract: The melting point of zirconium diboride is up to 3245 ° C. It is concerned widespread as a high-temperature structural materials because of high melting point, high hardness, excellent electrical conductivity and good thermal conductivity. In this paper zirconium diboride powder was prepared by the carbothermic reduction and precursor pyrolysis. XRD, SEM and DTA were used to characterize the performance of the two powders. Results show that the median diameter of zirconium diboride powder prepared by solid phase is about 6μm, round in shape, is not conducive to the sintering. Zirconium diboride powder prepared by precursor pyrolysis is massive, which is deposited by the layers of zirconium diboride crystals.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.624
    DOI: 10.4028/www.scientific.net/AMR.624.9
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2012
    detail.hit.zdb_id: 2265002-7
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  • 4
    Online Resource
    Online Resource
    The Anti-Oxidation Coatings of Carbon/Carbon Composites
    Trans Tech Publications, Ltd. ; 2014
    In:  Advanced Materials Research Vol. 1058 ( 2014-11), p. 253-256
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 1058 ( 2014-11), p. 253-256
    Abstract: C/C composites have excellent properties, but it will be rapidly oxidized when temperature is above 500 °C, which limits its applications in high temperature environment. In order to improve Anti-oxidation, using CVD method, a SiC coating is prepared on the surface of C/C composites. We have studied the microstructure of the SiC coating, oxidation resistance and high temperature mechanical properties. The results show that SiC coating has excellent oxidation resistance. When coated sample is oxidized at 1500 °C after 50 hours, its oxidation weight loss rate is only 1.45%, and coated samples can still maintain high mechanical properties at 1200 °C.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.1058
    DOI: 10.4028/www.scientific.net/AMR.1058.253
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2265002-7
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