Enhanced mechanical properties of SiC reticulated porous ceramics via adjustment of residual stress within the strut
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论文类型：期刊论文
发表时间：2018-01-01
发表刊物：INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
收录刊物：SCIE、EI、Scopus
卷号：15
期号：1
页面范围：28-35
ISSN号：1546-542X
关键字：mechanical properties; multi-layered struts; residual stress; SiC reticulated porous ceramics
摘要：Silicon carbide reticulated porous ceramics (SiC RPCs) with multi-layered struts were fabricated by polymer replica technique with SiC slurry, followed by infiltrating alumina slurries containing andalusite under vacuum condition. The effects of andalusite addition on the microstructure and mechanical properties of SiC RPCs were investigated, also the residual stress within the multi-layered strut was predicted. Theoretical calculations showed that the residual tensile stress generated in the outer layer of SiC RPCs because of its larger thermal expansion coefficient of infiltration slurry than that of SiC slurry at elevated temperature. Furthermore, the addition of andalusite reduced the thermal expansion coefficient and Young's modulus of infiltration slurries, thereby significantly reducing the residual stress of the outer layer in multi-layered struts. The reduced residual tensile stress within the outer layer was beneficial to eliminate surface cracks on the struts, thus improving the mechanical properties and thermal shock resistance of SiC RPCs.
发表时间：2018-01-01