Ultrahigh-temperature ZrB2-based ceramics with different sintering additions was developed for extreme conditions. Its strength characteristics, phase composition, and structure were examined. The ceramics was oxidized in air at 1250 and 1550°C. In addition, the most stable composites were subjected to temperature cycling in a flow of aviation fuel combustion products in a temperature range of 1400-1500°C. All materials show high oxidation resistance. The method used to produce samples influences their oxidation behavior: materials produced by vacuum hot pressing show higher oxidation resistance than those produced by hot pressing in a CO-CO2 atmosphere, probably because of their higher final density. The best results were obtained when ZrB2 sintering was combined with introduction of MoSi2 and CrB2
Ultrahigh-temperature ZrB2-based ceramics with different sintering additions was developed for extreme conditions. Its strength characteristics, phase composition, and structure were examined. The ceramics was oxidized in air at 1250 and 1550°C. In addition, the most stable composites were subjected to temperature cycling in a flow of aviation fuel combustion products in a temperature range of 1400-1500°C. All materials show high oxidation resistance. The method used to produce samples influences their oxidation behavior: materials produced by vacuum hot pressing show higher oxidation resistance than those produced by hot pressing in a CO-CO2 atmosphere, probably because of their higher final density. The best results were obtained when ZrB2 sintering was combined with introduction of MoSi2 and CrB2.
Behavior of ultra-high temperature ZrB2-based ceramics in oxidation
L Silvestroni
2018
Abstract
Ultrahigh-temperature ZrB2-based ceramics with different sintering additions was developed for extreme conditions. Its strength characteristics, phase composition, and structure were examined. The ceramics was oxidized in air at 1250 and 1550°C. In addition, the most stable composites were subjected to temperature cycling in a flow of aviation fuel combustion products in a temperature range of 1400-1500°C. All materials show high oxidation resistance. The method used to produce samples influences their oxidation behavior: materials produced by vacuum hot pressing show higher oxidation resistance than those produced by hot pressing in a CO-CO2 atmosphere, probably because of their higher final density. The best results were obtained when ZrB2 sintering was combined with introduction of MoSi2 and CrB2.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
