4.7 Article

Enhanced thermal stability of W-25Re/Ti/carbon-carbon composites via gradient diffusion-bonding

Journal

JOURNAL OF ALLOYS AND COMPOUNDS
Volume 924, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.166549

Keywords

Tungsten-rhenium; Carbon-carbon composite; Hot-press; Diffusion bonding; Interlayer

Funding

  1. Defense Acquisition Program Administration and Agency for Defense Development [UD140023GD, UD210022SD]
  2. Defense Acquisition Program Administration
  3. Agency for Defense Development [UD140023GD, UD210022SD]
  4. National Research Foundation of Korea (NRF) grant - Korean government (MSIT) [UD140023GD]
  5. Ministry of SMEs and Startups (MSS, Korea) [UD140023GD]
  6. [NRF- 2022R1C1C1011386]
  7. [S3301486]

Ask authors/readers for more resources

A carbon-carbon composite was successfully joined with a W-25Re alloy using a Ti interlayer through diffusion bonding technique. The cross-sections of the joints were investigated to examine the intermediate phase and elemental distribution near the Ti interlayer. The diffusion of components accelerated at high temperatures, resulting in the formation of various solid solution phases and metal carbide phases.
A carbon-carbon (C-C) composite was joined with a W-25Re alloy through a Ti interlayer using the diffu-sion-bonding technique. The stacked components were hot-pressed with an applied pressure of 25 MPa at 1600 & DEG;C for two hours. The cross-sections of the joints were investigated to examine the intermediate phase and elemental distribution near the Ti interlayer. It was confirmed that tungsten, rhenium, and carbon diffused into the Ti interlayer to form various intermediate phases; as a result, the joining interface re-mained stable through the gradient distribution of the intermeditate phases. The Ti interlayer was divided into two regions according to the diffusion range, and the Ti reacted with the carbon that had rapidly diffused from the C-C composite to generate precipitates. To evaluate the high-temperature durability of the joint interface, a thermal stability test was conducted at 2000 & DEG;C in an Ar atmosphere. The diffusion of the components accelerated at high temperatures, forming various solid solution phases (W(Re)-Ti and W-25Re-Ti) and metal carbide phases ((W,Ti)C1-x and TiC) in the expanded interfacial region.(c) 2022 Elsevier B.V. All rights reserved.

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