NICKEL-BASE METAL-CERAMIC HEAT-RESISTANT ALLOY

摘要

A nickel-base metal-ceramic heat-resistant sealing material, comprising, weight per cent: silicon dioxide, from 0.5 to 8.0 boron nitride, from 1.0 to 10.0 nickel, the balance. The material has a reduced hardness ranging from 25 to 40 kg/mm2 and enhanced heat resistance and thermal stability. The material is adapted mainly for producing sealing parts, such as, insert-pieces for turbine rotary shrouds designed to preclude the leakage of hot gases which could have taken place in case of increased clearances between the surface of the sealing part in the rim of the turbine shroud and rotating blades of a turbine rotor. The material is suitable for producing sealing members in the form of plates, bushes and bands useful for continuous operation over 3000 hours at 1000.degree.C or for shortterm operation at 1200.degree.C.