Mechanical, Tribological, and Thermal Properties of Hot‐Pressed Z r B 2 ‐ B 4 C Composite

The effect of addition of submicrometer‐sized B 4 C (5,10 and 15 wt%) on microstructure, phase composition, hardness, fracture toughness, scratch resistance, wear resistance, and thermal behavior of hot‐pressed Z r B 2 ‐ B 4 C composites is reported. Z r B 2 ‐ B 4 C (10 wt%) composite has V H 1 of 2...

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Bibliographic Details
Published in:International journal of applied ceramic technology 2015-05, Vol.12 (3), p.568-576
Main Authors: Chakraborty, Shirshendu, Debnath, Debashish, Mallick, Azizur Rahaman, Das, Probal Kumar
Format: Article
Language:English
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Summary:The effect of addition of submicrometer‐sized B 4 C (5,10 and 15 wt%) on microstructure, phase composition, hardness, fracture toughness, scratch resistance, wear resistance, and thermal behavior of hot‐pressed Z r B 2 ‐ B 4 C composites is reported. Z r B 2 ‐ B 4 C (10 wt%) composite has V H 1 of 20.81 GP a and fracture toughness of 3.93 at 1 kgf, scratch resistance coefficient of 0.40, wear resistance coefficient of 0.01, and ware rate of 0.49 × 10 −3  mm 3 /Nm at 10N. Crack deflection by homogeneously dispersed submicrometer‐sized B 4 C in Z r B 2 matrix can improve the mechanical and tribological properties. Thermal conductivity of Z r B 2 ‐ B 4 C composites varied from 70.13 to 45.30 W/m K between 100°C and 1000°C which is encouraging for making ultra‐high temperature ceramics ( UHTC ) component.
ISSN:1546-542X
1744-7402
DOI:10.1111/ijac.12290