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  • 1
    Electronic Resource
    Electronic Resource
    The Size and Morphology of Fine CaB〈sub〉6〈/sub〉 Powder Synthesized by Nanometer CaCO〈sub〉3〈/sub〉 as Reactant (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 369-372 
    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: Based on the CaCO3-B4C-C system to prepare calcium hexaboride (CaB6) powder, theinfluence of B4C size on the CaB6 powder was investigated in this paper, in which micro-sized B4Cin various size and nano-sized CaCO3 were as main raw materials. XRD and SEM were used tocharacterize the phase pattern, size and morphology of CaB6 powder particles respectively. Laserparticle size analyzer was employed to determine the size distribution of CaB6 particles. It wasfound that the size of B4C had a dominant effect on the size and distribution of CaB6 powderparticles. When B4C particles were much coarser than CaCO3, the CaB6 synthesized appeared asaggregates which size relied on B4C, however, the size of every CaB6 particle was determined byCaCO3. When B4C particles size was fine to several microns, the CaB6 particles synthesized weredispersive and the size of them has great relation to B4C. Synthesis models were also established todescribe various reaction processes
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.369.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanical Properties of LaB〈sub〉6〈/sub〉-ZrB〈sub〉2〈/sub〉 Composites (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 1630-1638 
    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 polycrystallined LaB6-ZrB2 composites with different content of ZrB2 were fabricated by vacuum hot-pressed sintering technique in this paper. The effects of ZrB2 content on the microstructure and mechanical properties were investigated. For the eutectic LaB6-ZrB2 (21wt%) composite, the hardness, flexural strength and fracture toughness is of 93.0 (HRA), 330.0MPa and 3.70MPa·m1/2, respectively. The results showed the hardness and flexural strength of LaB6-ZrB2 polycrystalline have been enhanced with the increasing of ZrB2 content, but the fracture toughness increases first then arrives at peak value, which is corresponding to the ZrB2 content of 21wt%. The microstructure observation revealed an improved densification due to addition of ZrB2. The fracture morphology showed a tendency of the fracturing from intergranular to transgranular manner withincreasing the ZrB2 content. The fracture behavior of the composites was analyzed in the paper
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.1630.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Mechanical Properties of CaB〈sub〉6〈/sub〉 Sintered Body (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 2707-2712 
    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 paper, CaB6 sintered body was fabricated by hot-pressed sintering with/without nickel as a sintering aid. The microstructure and fracture morphology were observed by means of SEM. CaB6 polycrystalline hot-pressed at 2123K showed insufficient densification. Fracture surface revealed that the existence of pores and the poor grain boundaries made the occurrence of intergranular fracture. When 28wt% nickel was added, nearly full density was obtained, although the sintering temperature is 200K lower. Hardness, Bending strength and fracture toughness of polycrystalline CaB6 were measured. By adding the Ni in CaB6 matrix, the flexural strength and the fracture toughness were enhanced, and the ratio of transgranular to intergranular fracture type was increased notably. The fracture surface showed a transgranular fracture. The crack bridging, micro-cracking and crack deflecting were deemed as the contribution to the improved fracture toughness
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.2707.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Microstructure and Mechanical Properties of Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉-TiC/Al in Situ Composites (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1857-1860 
    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 Al2O3-TiC/Al composites were prepared by injecting CO2 gas into Ti contained Al-Sialloy melts. The microstructure of the composites was examined by XRD, SEM and TEM. It wasindicated that both Al2O3 and TiC particles can be formed by the in situ reaction of CO2 with Ti andAl in the melten alloys. The Al2O3 and TiC particles in size of 0.3~1.5μm distributed uniformly inthe matrix. The volume fraction of the particles is mainly depend upon the time of CO2injection.The tensile strength at room temperature of the composites can reach 346.08MPa and thehardness is 149.6MPa HBS, repectively, which are higher than those of the matrix alloy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1857.pdf
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