ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
ZrB2-SiC ultra-high temperature ceramics (UHTCs) were pressureless sintered withY2O3-Al2O3 as the sintering additives. The effects of sintering additive and crystallization annealing onthe microstructure and properties of ZrB2-SiC UHTCs were investigated. Sintering was activated byproducing liquid phase of Y2O3 and Al2O3. The relative density of sintered ZrB2-20wt%SiC ceramiccould reach 96% when the content of sintering additive was 6% and the sintering temperature was 1750ºCand its bending strength, Vickers hardness, and fracture toughness were 412 MPa, 13 GPa, and 6.0MPa•m1/2, respectively. The crystallization annealing can result in YAG phase from grain boundary andenhance the high temperature properties of the UHTCs. The UHTCs have excellent ablation resistance atultra-high temperatures, and a very low ablation rate of 0.0006 mm/s after ablation for 900s at 2800ºC
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1746.pdf
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