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 machinable B4C/BN ceramics composites were fabricated by hot-pressing sinteringprocess at 1850oC for 1h under the pressure of 30MPa. The mechanical property, thermal shockbehavior and machinability of the B4C/BN ceramics composites were investigated in this article. Theexperimental results showed that the fracture strength and fracture toughness of the B4C/BNnanocomposites were significantly improved in comparison with the B4C/BN microcomposites. TheVickers hardness of the B4C/BN nanocomposites and B4C/BN microcomposites decreased graduallywith the increasing content of h-BN, while the machinability of the B4C/BN nanocomposites andB4C/BN microcomposites were significantly improved. The B4C/BN ceramics composites with theh-BN content more than 20wt% exhibited excellent machinability. The thermal shock resistances ofthe B4C/BN ceramics composites were better than that of the B4C monolith, and the thermal shockresistance of the B4C/BN nanocomposites was much better than that of the B4C/BN microcomposites.The thermal shock temperature difference (-Tc) of B4C monolith was about 300oC, while the -Tc ofthe B4C/BN microcomposites was about 500oC, the -Tc of the B4C/BN nanocomposites was about600oC
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.569.53.pdf
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