| Microstructure and Thermal Shock Resistance of
Zr7/8Ti1/8B2
-20 vol% SiC Composites Synthesized by
Mechanical Alloying and Spark Plasma Sintering
|
Zixu Ji,a
Ning Liao,a, b, * Yawei Li,a, b Tianbin Zhu,a, b Mithun Natha, b and Zhihua Yangc
Pages : 122-128
DOI : 10.1080/0371750X.2023.2189621 |
| Abstract |
| ZrB2
-based composites are promising ultra-high temperature materials, nonetheless
their poor damage tolerance and low oxidation resistance hinder their practical
applications. In the present work, Zr1–xTixB2
-20 vol% SiC composites were prepared
based on the mechanical alloying (MA) method and spark plasma sintering (SPS)
technique. The results showed that solid solution of ZrTiB4
can be obtained by taking
nano-sized ZrB2
-TiB2
powders from the MA process. The Zr7/8Ti1/8B2
-20 vol% SiC
composites presented higher fracture toughness due to various toughening
mechanisms, such as ‘crack deflection’ and ‘pull out’ induced by the finer solid
solution particles and nano-sized graphite. Consequently, Zr7/8Ti1/8B2
-20 vol% SiC
composites possessed a residual strength of 180 MPa after thermal shock test with
a temperature difference of 1000oC, while the conventional ZrB2
-20 vol% SiC
composites only remained at 81.4 MPa. |
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