Fracture Toughness of Ceramics in the Ain-SiC System

Handbook of SiC properties for fuel performance modeling

“…The fracture toughness of SiC has been widely investigated by various test techniques: micro-and nano-indentation [32,71,76,78,87,[90][91][92]94,110,112,113,117,118], surface crack in flexure (SCF) [29,71,72,77,82,105,109,112,[119][120][121][122][123], double cantilever beam (DCB) [117], double torsion (DT) [75,106,117,124], single edge notched beam (SENB) [54,58,88,117,120,121,[125][126][127][128][129][130][131][132], Chevron notched beam (CNB) [121], and fractography [120]. The representative values determined by each test are sum...…”

Corrosion of a unidirectionally solidified Al2O3/YAG eutectic composite in a combustion environment

“…These self-reinforced ceramics can be formed by (i) growth from the liquid phase (e.g., Si 3 N 4 Al 2 O 3 and mullite); 1-3 (ii) by decomposition of single solid solution (e.g., AlN−SiC); 4 and by (iii) simultaneous crystallization of more than one solid from a eutectic composition liquid (e.g., directionally solidified oxide eutectic composites those we call as melt-growthcomposites, MGCs). 5 In all cases, the initial composition forms a liquid or solid solution with a different morphology.…”

Processing Aluminum Nitride‐Silicon Carbide Composites via Polymer Infiltration and Pyrolysis of Polymethylsilane, a Precursor to Stoichiometric Silicon Carbide

“…There are now several reports on the processing and properties of fully dense A1N-SiC and Al 2 O 3 -SiC nanocomposites. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] As anticipated, these nanocomposite PRCs exhibit hightemperature fracture toughness, mechanical strength, and creep resistance superior to conventionally processed PRCs. These improvements are attributed to the refined microstructure 13,15 and introduction of compressive stresses.…”

“…25 Hot pressing (HPing) is the current method of choice for producing dense, nanocrystalline PRCs. [8][9][10][11][12][13][14][15][16][20][21][22][23][24] For example, amorphous Si-C-N precursor powders can be HPed under nitrogen to form crystalline Si 3 N 4 matrices reinforced with nanosized SiC particles. 22 Unfortunately, many processing constraints render HPing an impractical production method.…”

“…The structural similarity between AlN and 2H-␣-SiC favors interdiffusion and formation of solid solutions, rather than grain growth, when powders are HPed at >2000°C. [8][9][10][12][13][14][15][16]20,21 Annealing the resulting solid solution (Յ1900°C) causes multidirectional spinodal decomposition 27 to an AlN-SiC nanocomposite with thermomechanical properties superior to the individual components. Kou and Virkar 27 report modulated AlN-SiC nanocomposite creep rates 3 times lower (values not provided) than AlN-SiC solid solutions with identical grain sizes.…”