Change in microstructures and physical properties of ZrB2–SiC ceramics hot-pressed with a variety of SiC sources

High‐temperature phase and microstructure evolution of polymer‐derived SiZrCN and SiZrBCN ceramic nanocomposites

“…However, in most cases these additives are added to UHTCs via mechanical mixing procedures, making it difficult to disperse these crystalline powders homogeneously within the UHTC matrix, especially for nano‐sized additives. Employing chemical synthesis to introduce nanoscaled silicon‐containing phases into the UHTC matrix is likely to be a better way 4,12,13 …”

“…Employing chemical synthesis to introduce nanoscaled silicon-containing phases into the UHTC matrix is likely to be a better way. 4,12,13 The polymer-derived ceramic (PDC) technique is an applicable chemical approach to synthesize multielement silicon-based ceramics. [14][15][16][17][18][19] In particular, polymer-derived ceramic nanocomposites comprising of highly refractory secondary phases (eg group IV transition metal oxides, carbides, (carbo)nitrides, silicides) dispersed within a PDC-based matrix (such as SiOC, SiCN, SiBCN) have been reported within the last years to exhibit improved thermal stability, and oxidation and corrosion resistance as compared with their PDC counterparts.…”

Significance of hot pressing parameters and reinforcement size on sinterability and mechanical properties of ZrB2–25vol% SiC UHTCs

“…It was clarified that the ZrB 2 or SiC grain size after hot pressing, highly depended on the initial particle size of SiC. The enhanced mechanical properties, using the fine SiC, are compatible with the Hall-Petch relation [13]. The ZrB 2 -SiC composites with different amounts of SiC (0, 10, 20 and 30 vol %), whose mean particle size of ZrB 2 and SiC were $ 1 mm and $ 30 nm, respectively, were densified by hot pressing at 1900 1 C for 60 min under a 30 MPa uniaxed pressure.…”

Brazing of ZrB2–SiC–C ceramic and GH99 superalloy to form reticular seam with low residual stress

“…As an ultra high temperature ceramic (UHTC) material, ZrB 2 -SiC-C ceramic (named as ZSC for convenience) has unique properties including high melting temperature, high hardness, good chemical stability and excellent thermal shock resistance [1][2][3][4][5]. In particular, it possesses superior oxidation resistance and fracture toughness attributed to the addition of SiC particles and graphite flakes to the ceramic [6][7][8].…”