Powder synthesis, densification, microstructure, and mechanical properties of HfB 2 ‐HfC ceramic composites
Source abstract
Abstract
Abstract A new route based on HfO 2 + B 4 C + C → HfB 2 + HfC + CO reaction was developed to synthesize HfB 2 ‐HfC hybrid powders. X‐ray diffraction, scanning electron microscopy, energy dispersive spectrometry, and transmission electron microscopy were used to evaluate the powder products. The effects of excess additions of B 4 C and C on the phase constituents of the powder products were investigated. Thermodynamics of relevant reactions for the synthesis of the hybrid powders were calculated to guide the selection of compositions and processing parameters. The results indicated that HfB 2 ‐HfC hybrid powders were obtained by reaction at 1750°C for 1 h. HfB 2 :HfC phase content ratios showed a dependence on B 4 C and C additions. The obtained hybrid powders exhibited good oxidation resistance with an oxidation activation energy of 303 kJ/mol. Good sinterability of the powder products was demonstrated by spark plasma sintering at 2100°C. The consolidated ceramics based on them measured good Vickers’ hardness values (>26.0 ± .5 GPa) and fracture toughness (>3.78 ± .27 MPa·m 1/2 ).
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · MXene and MAX Phase Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
College of Materials Science and Engineering North Minzu University Yinchuan China
Key Laboratory of Powders and Advanced Ceramics North Minzu University Yinchuan China
National and Local Joint Engineering Research Center of Advanced Carbon‐Based Ceramics North Minzu University Yinchuan China
Funding
National Natural Science Foundation of China · Key Research and Development Program of Ningxia
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