On the connection between the adhesive strength and temperature drops in heat-protective coatings

We propose a procedure and results of experimental determination of the dependence of adhesive strength of a ZrO₂ plasma-sprayed heat-protective coating with NiCr sublayer on the value of the stationary temperature drop in it. The dependences of the adhesive strength on the temperature of the surface of adhesive contact are compared for homogeneous and inhomogeneous temperature fields. The results obtained enable us to substantiate the choice of temperature drop in heat-protective coatings with regard for the adhesion safety factor. Institute for Problems of Strength, National Academy of Sciences of Ukraine, Kiev, Ukraine. Translated from Problemy Prochnosti, No. 4, pp. 126–130, July–August, 1998.     

Some questions of the industrial use of alkaline kaolins of the Azov region

Glass and Ceramics -     

The effect of neutron irradiation on the structure and properties of ferrito-pearlitic steels

Specimens of steels 1Kh17N2, 2Kh13, and 30KhMA, which are susceptible to heat treatment, and of steel 1Kh17 containing niobium, which is not susceptible to heat treatment were subjected to irradiation with fast neutrons at temperatures of 70° and 500–600 °C.As a result of irradiation at 500–600 °C the mechanical properties of steels 1Kh17N2, 2Kh13, and 30KhMA undergo considerable change, but no change is observed in steel 1Kh17 containing niobium. Metallographic examination shows that the increases in the strength properties of the steels mentioned during irradiation at 500–600 °C is connected with a change in structure. In the opinion of the authors the observed changes in microstructure are due to the formation of displacement spikes in the irradiated material.