Flow choking pin used for brazing repair of engine blade with exhaust holes and preparation method

• Main Authors: GUO LIANPING, CHENG XIAOHONG, ZHAI JIANNAN, YANG CHENGLONG, HOU TINGHONG, FU JUNBO, CHEN HAISHENG
• Format: Patent
• Language: Chinese; English
• Published: 24.05.2017
• Subjects: CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; MINERAL OR SLAG WOOL; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; TRANSPORTING; WELDING; WORKING BY LASER BEAM

The invention relates to the technical field of aero-engine maintenance, in particular to a flow choking pin used for brazing repair of an engine blade with exhaust holes and a preparation method. A frit high-temperature ceramic layer is arranged on the periphery of an alloy pin in a sintered mode, then the surface of the high-temperature ceramic is coated with an oxide slurry-type flow choking agent, and the flowing choking pin of a three-layer structure is obtained. The problem that slurry flow choking agents are prone to falling off and polluting brazed surfaces during usage is effectively solved, and the flow-choking protection effect is improved, so that the brazing quality is improved; and the hole cleaning procedure due to hole blockage is shortened, and the repair cycle is shortened. The flowing choking pin of the three-layer structure is well attached to the walls of the exhaust edge holes, the brazing quality is stable when failures such as cracks of exhaust edges are subjected to brazing repair, th