期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 36, 期 7, 页码 1539-1548出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2016.02.009
关键词
TaC; HfC; Spark plasma sintering; UHTCs
资金
- CONACYT (Consejo Nacional de Ciencia y Tecnologia, Mexico) [214654]
- UK EPSRC Material Systems for Extreme Environments programme grant [EP/K008749/1]
- Engineering and Physical Sciences Research Council [EP/K008749/1, EP/K008749/2] Funding Source: researchfish
- EPSRC [EP/K008749/1, EP/K008749/2] Funding Source: UKRI
Solid solution formation and sintering behaviour of TaC-HfC ceramics made from commercial TaC and HfC powders prepared using spark plasma sintering (SPS) at temperatures up to 2450 degrees C was investigated. Phase analysis and lattice parameter measurements using X-ray Diffraction (XRD) showed mutual diffusion of Hf and Ta with increasing sintering temperature. High Resolution Transmission Electron Microscopy (HRTEM) confirmed that solid solution formation and densification were achieved by a solid-state mechanism. Solid solutions were achieved for 4TaC-1HfC, 1TaC-1HfC and 1TaC-4HfC powders after sintering at temperatures of at least 2350 degrees C. Fracture toughness (Kit) values were in the range of 2.7-3.4 MPa m(1/2) for all ceramics measured using Vickers indentation. Thermal conductivity of TaC was 55.8 W/m K at 1400 degrees C. Coefficients of thermal expansion (CTE) varied from 7.08-7.66 x 10(-6)/K (in the range of 25-2000 degrees C), with TaC at the lower end. (C) 2016 Elsevier Ltd. All rights reserved.
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