Ablation-resistant carbide Zr_0.8Ti_0.2C_0.74B_0.26 for oxidizing environments up to 3,000 °C.

ABSTRACT: Ultra-high temperature ceramics are desirable for applications in the hypersonic vehicle, rockets, re-entry spacecraft and defence sectors, but few materials can currently satisfy the associated high temperature ablation requirements. Here we design and fabricate a carbide (Zr_0.8Ti_0.2C_0.74B_0.26) coating by reactive melt infiltration and pack cementation onto a C/C composite. It displays superior ablation resistance at temperatures from 2,000-3,000 °C, compared to existing ultra-high temperature ceramics (for example, a rate of material loss over 12 times better than conventional zirconium carbide at 2,500 °C). The carbide is a substitutional solid solution of Zr-Ti containing carbon vacancies that are randomly occupied by boron atoms. The sealing

SUBMITTER: Zeng Y 

PROVIDER: S-EPMC5474735 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature