Heat Resistance of Laminated Niobium- and Molybdenum-Based Composites with Coatings

The heat resistance of composite materials fabricated by diffusion welding under pressure and consisting of alternating layers of niobium, molybdenum, and Nb30Ti or Nb0.1C alloy or layers of Nb–Al, Ti–Al, or Mo–Al intermetallics has been studied. Two types of coatings, namely, ZrO 2 –Y 2 O 3 sol–gel coating or electrochemical chromium–diamond coating, are deposited onto composite samples. The samples are subjected to heat resistance tests in air at temperatures of 800 and 1000°C. Nb30Ti/Al composite samples with a chrome–diamond coating demonstrate the highest heat resistance, which is several orders of magnitude higher than the heat resistance of uncoated niobium samples.