Details

Autor(en) / Beteiligte

• Zhang, Mao-yan
• Li, Ke-zhi
• Shi, Xiao-hong
• Guo, Ling-jun
• Sun, Jia-jia
• Shen, Qing-liang

Titel

Effects of low-temperature thermal cycling treatment on the microstructures, mechanical properties and oxidation resistance of C/C-ZrC-SiC composites

Ist Teil von

• Journal of alloys and compounds, 2017-10, Vol.721, p.28-35

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Carbon/Carbon (C/C) composites modified with ZrC and SiC particles were prepared by precursor infiltration and pyrolysis (PIP) process. Effects of the simulated low earth orbit environment including the vacuum environment (under the high-vacuum state of 1.3 × 10−3 Pa) and low-temperature thermal cycling (the temperature is ranged from 153 K to 393 K for 200 times) on C/C-ZrC-SiC composites were investigated. These results show that the significantly generated microcracks, interspaces and interface debondings contributed to the increase of open porosity. The interfacial damages of C/C-ZrC-SiC composites caused by low-temperature thermal cycling in short-cut webs and non-woven webs were generated at fiber/matrix interface and fiber bundle/matrix interface, respectively. The flexural strength of C/C-ZrC-SiC composites increased by 9.35% after 100-time thermal cycles and then decreased dramatically to 83.99% of pristine strength after 200-time thermal cycles, accompanied by the transformation of fracture behavior from the brittle fracture mode into the pseudo-plastic fracture mode. In addition, the defects induced by the low-temperature thermal cycling accelerated the oxidative damage of C/C-ZrC-SiC composites during thermal shock between 1773 K and room temperature. [Display omitted] •Effects of the simulated low earth orbit environment on C/C-ZrC-SiC composites were investigated.•Two different types of interface damage formed in C/C-ZrC-SiC composites with the increase of cycle number.•The initial 100-time thermal cycles enhanced the flexural strength (9.35%) of C/C-ZrC-SiC composites.•The defects induced by the low-temperature thermal cycling accelerated the oxidative damage of C/C-ZrC-SiC composites.