The Experts below are selected from a list of 14388 Experts worldwide ranked by ideXlab platform

Jie Zhang - One of the best experts on this subject based on the ideXlab platform.

  • benefits of zr Additive Element in the ti24ni eutectic filler in vacuum brazing of sic ceramics
    Vacuum, 2019
    Co-Authors: Jie Zhang
    Abstract:

    Abstract The SiC ceramics have been successfully brazed using Ti 24Ni (at. %) eutectic filler at 1030 °C with 15 min holding time. A Ti5Si3 and TiC mixed reaction layer was formed adjacent to SiC substrate, while Ti2Ni intermetallic compound was the major component in brazing seam area. It's found that the Ti2Ni phase has extremely high coefficient of thermal expansion (CTE), and the residual stress caused by the CTE mismatch between Ti2Ni and SiC is unfavorable for shear strength of the joints. Through adding 15 at. % Zr into the Ti 24Ni filler, α-Ti[Zr] solid solution with lower CTE as well as good ductility was generated in the joints, which was beneficial for relaxing the residual stress. Consequently, shear strength of the joints was improved from 69 MPa to 112  MPa at room temperature and from 36 MPa to 62  MPa at 600 °C, respectively.

  • benefits of zr Additive Element in the ti 24ni eutectic filler in vacuum brazing of sic ceramics
    Vacuum, 2019
    Co-Authors: Jie Zhang
    Abstract:

    Abstract The SiC ceramics have been successfully brazed using Ti 24Ni (at. %) eutectic filler at 1030 °C with 15 min holding time. A Ti5Si3 and TiC mixed reaction layer was formed adjacent to SiC substrate, while Ti2Ni intermetallic compound was the major component in brazing seam area. It's found that the Ti2Ni phase has extremely high coefficient of thermal expansion (CTE), and the residual stress caused by the CTE mismatch between Ti2Ni and SiC is unfavorable for shear strength of the joints. Through adding 15 at. % Zr into the Ti 24Ni filler, α-Ti[Zr] solid solution with lower CTE as well as good ductility was generated in the joints, which was beneficial for relaxing the residual stress. Consequently, shear strength of the joints was improved from 69 MPa to 112  MPa at room temperature and from 36 MPa to 62  MPa at 600 °C, respectively.

Shinsuke Yamanaka - One of the best experts on this subject based on the ideXlab platform.

  • effect of nb addition on the terminal solid solubility of hydrogen for zr and zircaloy 4
    Journal of Alloys and Compounds, 2007
    Co-Authors: Masato Ito, Hiroaki Muta, Masayoshi Uno, Shinsuke Yamanaka
    Abstract:

    Abstract The terminal solid solubility of hydrogen (TSS) for pure Zr, Zr–Nb binary alloys with different Nb concentrations, and Nb added Zircaloy-4 was examined from the view point of the integrity of new-type nuclear fuel cladding. These alloys were hydrogenated by a modified UHV Sieverts’ apparatus at 973 K. The hydrogen concentration and the hydride dissolution temperature of specimen were measured by using a hydrogen analyzer and a differential scanning calorimeter (DSC), respectively, and then the terminal solid solubility of hydrogen was determined. The TSS of the α single-phase Zr–0.3Nb (Zr–0.3 wt.% Nb) specimen appeared to be almost same as that of pure Zr. On the contrary, the TSS of the Zr–1.0Nb and Zr–2.5Nb alloys, which were α + β biphasic specimens, were larger than that of pure Zr and slightly increased with Nb concentration. The increment of TSS by Nb addition was slightly larger than that by the traditional Additive Elements of Sn, Ni, and Cr in Zircaloys. The Nb added Zircaloy-4 had higher TSS than the Zircaloy-2 and -4, which was attributed to the further Additive effect by βZr precipitation in Zircaloy besides the traditional Additive Element effects.

Yoshihiko Hirotsu - One of the best experts on this subject based on the ideXlab platform.

Masato Ito - One of the best experts on this subject based on the ideXlab platform.

  • effect of nb addition on the terminal solid solubility of hydrogen for zr and zircaloy 4
    Journal of Alloys and Compounds, 2007
    Co-Authors: Masato Ito, Hiroaki Muta, Masayoshi Uno, Shinsuke Yamanaka
    Abstract:

    Abstract The terminal solid solubility of hydrogen (TSS) for pure Zr, Zr–Nb binary alloys with different Nb concentrations, and Nb added Zircaloy-4 was examined from the view point of the integrity of new-type nuclear fuel cladding. These alloys were hydrogenated by a modified UHV Sieverts’ apparatus at 973 K. The hydrogen concentration and the hydride dissolution temperature of specimen were measured by using a hydrogen analyzer and a differential scanning calorimeter (DSC), respectively, and then the terminal solid solubility of hydrogen was determined. The TSS of the α single-phase Zr–0.3Nb (Zr–0.3 wt.% Nb) specimen appeared to be almost same as that of pure Zr. On the contrary, the TSS of the Zr–1.0Nb and Zr–2.5Nb alloys, which were α + β biphasic specimens, were larger than that of pure Zr and slightly increased with Nb concentration. The increment of TSS by Nb addition was slightly larger than that by the traditional Additive Elements of Sn, Ni, and Cr in Zircaloys. The Nb added Zircaloy-4 had higher TSS than the Zircaloy-2 and -4, which was attributed to the further Additive effect by βZr precipitation in Zircaloy besides the traditional Additive Element effects.

Kazuhisa Sato - One of the best experts on this subject based on the ideXlab platform.