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Evaluation of Amorphous Ti Brazes to Join Zirconium Diboride‐Based Ultra‐High‐Temperature Ceramics to Metallic Systems
Author(s) -
Asthana Rajiv,
Singh Mrityunjay
Publication year - 2013
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12154
Subject(s) - materials science , ceramic , zirconium , amorphous solid , dissolution , titanium , hot pressing , zirconium diboride , metallurgy , titanium diboride , thermal expansion , composite number , thermal , degradation (telecommunications) , composite material , crystallography , thermodynamics , chemical engineering , telecommunications , chemistry , physics , computer science , engineering
Hot‐pressed Z r B 2 ‐based ultra‐high‐temperature ceramics ( UHTC ) were joined to titanium and I nconel‐625 using Ti‐375 (Ti‐37.5Zr‐15Cu‐10Ni) and Ti‐120 (Ti‐12Zr‐22Cu‐12Ni‐1.5Be‐0.8V) brazes. Bonding was metallurgically sound even though the extent of chemical interaction was limited to the dissolution of Z r B 2 . No evidence of S i C dissolution was observed. Hairline cracks formed in some joined UHTC s because of thermal expansion mismatch. These low‐temperature brazes minimize chemical degradation of the reinforcement and may be suited to joining the Z r B 2 ‐based composite components outside of the hot zone in locations that are amenable to external cooling. Potential thermal benefits of such joints for enhanced heat transfer are highlighted.