Design, fabrication and properties of layered SiC/TiC ceramic with graded thermal residual stress

Brazing of doped graphite to Cu using stress relief interlayers

“…An effective approach to predict and find a solution for this problem numerically is the finite element method (FEM), which can analyze the magnitude and distribution of the residual stresses along a joint based on the particular properties of the materials to be joined. Extensive studies had been carried out to troubleshoot by FEM in many different cases, including ceramic/ceramic joints (Qin et al, 2003), ceramic/metal joints (Zhang et al, 2002;Suganuma et al, 1984) and metal/metal joints (Nishi, 2004). FEM analysis was using ANSYS program (Ver.8.0), because of the strains of interlayer, filler metal and Cu substrate can relax residual stress in high temperature, thus FEM calculations were made to obtain the residual stresses (tensile stress) that developed in a joined DG/Cu specimen without interlayer and with multi-interlayer as they were cooled from 700 • C to room temperature, only thermal loading was employed to the model.…”

Design and development of SiC/(W,Ti)C gradient ceramic nozzle

“…The Young's modulus E(z), Poisson's ration ν(z) and thermal expansion coefficient α(z) varied functionally along the z-axis [12,13] . It is very difficult to get the residual stress solution from its controlling differential equation directly, so Finite Element Method had to be used to obtain the residual stress distribution [14,15] . Residual stress distribution was calculated under the boundary conditions of the compact cooled from sintering temperature T 1 to room temperature T 2 with a holding time t, cooling velocity V and pressure p. All the layers experienced temperature loading step s.…”

Reaction of TiC with SiCl4 vapor with formation of SiC–TiC composites

“…For example, SiC-TiC composites have been fabricated by SPS of a mixture of ␤-SiC and TiC powders without additive at 1800 • C. 6 There have also been several studies on in situ fabrication of SiC-TiC composites by chemical vapor deposition (CVD) to produce fine homogeneous composite particles of high purity. [11][12][13][14][15][16] For example, Kawai et al fabricated SiC-TiC ceramics by CVD using a gas mixture of SiCl 4 , TiCl 4 and hydrocarbon. 11 A French group used SiH 2 Cl 2 instead of SiCl 4 as a precursor for the CVD deposition of nanocomposite SiC-TiC-C on carbon substrate.…”

“…In addition to the fabrication of SiC-TiC composites, layered SiC/TiC ceramics with graded compositions have been fabricated with good mechanical properties. 16 For SiC-TiC composites to be densified, well-mixed unagglomerated powders of SiC and TiC are required as the starting material. As described above, TiC/SiC composites are usually made from respective mechanically mixed powders.…”