The　brazed　joining　between　Kovar　alloy　and　sapphire　was　successfully　achieved　by　using　TiB　whisker　reinforcement　and　applying　the　surface　micro-nano　structure.　We　systematically　studied　the　composition　and　mechanical　properties　of　Kovar/Sapphire　joint.　The　typical　interfacial　structure　of　the　joint　brazed　at　825　°C　for　10　min　was　determined　as　Sapphire/　γ-TiO/　Ti3(Cu,Al)3O/　Ag(s,s)　+　Cu(s,s)　+　TiB/　Ti2Cu　+　TiFe2　+　TiNi3/　Kovar　alloy.　The　addition　of　B　forms　tiny　TiB　whisker　reinforcement　phase　in　situ,　which　refines　the　interface　structure.　The　presence　of　micro-nano　structures　improves　the　interface　products　on　the　sapphire　side:　reducing　the　generation　of　Ti3(Cu,Al)3O　and　replacing　it　with　γ-TiO.　This　makes　the　phase　transition　on　the　sapphire　side　smoother　and　reduces　thermal　expansion　coefficient　mismatch,　thereby　enhancing　joint　strength.　Under　suitable　brazing　parameters,　the　maximum　shear　strength　of　the　joint　is　137　MPa.　This　study　provides　new　insights　for　optimizing　and　improving　connections　between　sapphire　ceramics　and　metals,　with　potential　applications　in　more　ceramic/metal　joining.　©　2024　Elsevier　Inc.