Preparation of C_f/HfC Composite by Reactive MeltInfiltration Using Hf-Based Alloy

Abstract:

A HfZrSiTa alloy of low melting point was designed by phase diagram calculation and smelted. The C_f/HfC composite was then prepared by reactive melt infiltration at relative low temperature. The open porosity of specimen was 8.45%. By SEM, XRD and EDS, it was found that the melt infiltration microstructure mainly consists of HfC, ZrC, Hf₂Si, Zr₂Si phases and a small amount of Hf, Zr phases. The as-received C_f/HfC composite, with the flexural strength of 165 MPa, displayed a typical brittle fracture behavior. Ablation properties of the C_f/HfC composite were tested by an oxyacetylene flame. The linear ablation rate was 0.03 mm/s. An oxide barrier layer was formed on the ablation surface and the ablation resistance of the composite has been largely improved.

• Periodical: Materials Science Forum (Volume 816)
• Pages: 126-132
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.816.126
• Online since: April 2015
• Authors: Zhen Huan Yang, Hong Zhang, Yi Cong Ye*
• Keywords: C_f/HfC Composite, Hf-Based Alloy, Reactive Melt Infiltration

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