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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.43  No.4 (2002)  >  pp.712-720

MATERIALS TRANSACTIONS
<<Previous article Vol.43  No.4 (2002)   pp.712 - 720 Next article>>

Characterization of Directionally Solidified B4C-TiB2 Composites Prepared by a Floating Zone Method

Itaru Gunjishima1), Takaya Akashi1) and Takashi Goto1)
1) Institute for Materials Research, Tohoku University

Directionally solidified B4C–TiB2 composites were prepared by a Floating Zone method. TiB2 phases in a rod shape were continuously connected in the B4C matrix. The c-axes of TiB2 and B4C phases were perpendicular and tilted 22° to the growth direction, respectively. The (101) and (1\bar20) planes of the B4C were in parallel to the (001) and (100) planes of TiB2, respectively. The electrical conductivity of the composite parallel to the growth direction (σ||) was greater than monolithic B4C by a factor of 100 to 1000. The thermal conductivity of the composite parallel to the growth direction (κ||) was about one and a half times as high as that of B4C. The anisotropy of electrical and thermal conductivity were basically explained by a mixing law using the values of B4C and TiB2. The microhardness of the composite was almost the same as that of B4C. The electric discharge machining of the composite was possible owing to the enhancement of electrical conductivity.


Keyword:
boron carbide, titanium diboride, eutectic, directional solidification, floating zone, electrical conductivity, thermal conductivity, electric discharge machining, hardness

Received: December 20, 2001
Accepted: February 25, 2002 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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