Effect of Ball Milling on Reaction Mechanism between Ti and B4C and Subsequent Densification

Hui Hua Wang; Shu Chen Sun; De Yong Wang; Gan Feng Tu

doi:10.4028/www.scientific.net/AMR.479-481.8

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 479-481Effect of Ball Milling on Reaction Mechanism...

Effect of Ball Milling on Reaction Mechanism between Ti and B₄C and Subsequent Densification

Abstract:

The effect of ball milling pretreatment of the starting Ti and B₄C powder blends on the synthesis of dense TiB₂/TiC composite was investigated. X-ray diffraction analysis showed that the TiC phase was not produced until the milling time was up to 18h and only a minimal amount of TiB₂ was generated, even after 48h of milling. It is clear that no complete conversion of the starting reactants to the desired products characterized as TiB2/TiC powder mixture take place within the investigated conditions. The decreased particle sizes of the reactants and high concentration of defects induced from ball milling, allow the completely chemical reaction of reactants into the desired composition (2TiB₂/TiC), corresponding to the rapid and significant sample shrinkage occurring before 500°C. The target products obtained starting from mechanical activation reactants also showed relatively uniform microstructures and densities greater than 98% of the theoretical value.

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Periodical:

Advanced Materials Research (Volumes 479-481)

Pages:

8-12

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.479-481.8

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Online since:

February 2012

Authors:

Hui Hua Wang, Shu Chen Sun, De Yong Wang, Gan Feng Tu

Keywords:

Mechanical Alloying, Reaction Path, Sample Shrinkage, TiB₂/TiC Composite

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