# Enhancing Ablation Resistance of TaB2-Based Ultra-High Temperature Ceramics by Mixing Fine TaC Particles and Dispersed Multi-Walled Carbon Nanotubes

## TL;DR

This paper shows how adding TaC particles and carbon nanotubes improves the heat resistance and durability of ultra-high temperature ceramics.

## Contribution

The first collaborative use of fine TaC particles and dispersed MWCNTs in TaB2-based UHTCs is introduced.

## Key findings

- The UHTCs achieved a relative density of 98.6% and nano hardness of 21.7 GPa.
- Ablation resistance improved with a mass ablation rate of −1.3 × 10−3 mg/(s·cm2).
- Enhanced resistance is attributed to physical pinning, sealing, and self-healing effects.

## Abstract

Ultra-high temperature ceramics (UHTCs) have been widely applied in many fields. In order to enhance the comprehensive properties of TaB2-based UHTCs, the first collaborative use of fine TaC particles and dispersed multi-walled carbon nanotubes (MWCNTs) was employed via spark plasma sintering (SPS) at 1700 °C. The derived UHTCs exhibited an average grain size of 1.3 μm, a relative density of 98.6%, an elastic modulus of 386.3 GPa, and a nano hardness of 21.7 GPa, leading to a greatly improved oxidation resistance with a lower linear ablation rate at −3.3 × 10−2 μm/s, and a markedly reinforced ablation resistance with mass ablation rate of −1.3 × 10−3 mg/(s·cm2). The enhanced ablation resistance was attributable to the physical pinning effect, sealing effect and self-healing effect. Thus, this study provides a potential strategy for preparation of UHTCs with bettered ablation resistance and physical properties.