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Preparation and Thermal Ablation Behavior of HfB 2 –SiC‐Based Ultra‐High‐Temperature Ceramics Under Severe Heat Conditions
Author(s) -
Zhang Xinghong,
Weng Ling,
Han Jiecai,
Meng Songhe,
Han Wenbo
Publication year - 2009
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2008.02264.x
Subject(s) - materials science , microstructure , sintering , ceramic , composite number , flexural strength , composite material , nitride , spark plasma sintering , layer (electronics)
HfB 2 –SiC‐based ultra‐high‐temperature ceramics with aluminum nitride (AlN) as a sintering aid were hot pressed at 1850°C. The sinterability and mechanical properties were investigated and compared with the composite without a sintering aid. It was shown that the addition of AlN greatly improved the powder sinterability and enabled the production of a nearly full‐dense composite. The mechanical properties, especially the flexural strength, were enhanced remarkably through the improvement in the sinterability and microstructure. The oxidation resistance of a composite doped with 10 vol% AlN was evaluated by a plasma arc heater and the ablation mechanism was discussed.