Reactive Spark Plasma Sintering and Mechanical Properties of Zirconium Diboride–Titanium Diboride Ultrahigh Temperature Ceramic Solid Solutions

Technologies

卷:4

Karthiselva N. S.¹  Srinivasa Rao Bakshi¹ 

[1] Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India;

关键词: ball milling;    reactive spark plasma sintering;    borides;    UHTCs;    solid solution;   

DOI  :  10.3390/technologies4030030

来源: DOAJ

【 摘 要 】

Ultrahigh temperature ceramics (UHTCs) such as diborides of zirconium, hafnium tantalum and their composites are considered to be the candidate materials for thermal protection systems of hypersonic vehicles due to their exceptional combination of physical, chemical and mechanical properties. A composite of ZrB2-TiB2 is expected to have better properties. In this study, an attempt has been made to fabricate ZrB2-TiB2 ceramics using mechanically activated elemental powders followed by reactive spark plasma sintering (RSPS) at 1400 °C. Microstructure and phase analysis was carried out using X-ray diffractometer (XRD) and electron microscopy to understand microstructure evolution. Fracture toughness and hardness were evaluated using indentation methods. Nanoindentation was used to measure elastic modulus. Compressive strength of the composites has been reported.

【 授权许可】

Unknown