Abstract
1. A study was made of the thermal stability of tungsten and molybdenum disulfides, molybdenum, tungsten, and niobium diselenides, and boron nitride at temperatures of 1050–1350‡C. 2. It was established that, in the temperature range 1000–1250‡C, tungsten and molybdenum disulfides are thermally stable in a helium atmosphere under an excess pressure of 0.2 atom gauge. 3. It was demonstrated that molybdenum diselenide is stable during isothermal holding in helium for 10 h at temperatures up to 1150‡C, while niobium diselenide forms homogeneous phases during 2.5-h holdings in the range 1000–1250‡C and 1-h holdings at 1350‡C. 4. It was established that boron nitride exhibits no changes during holding in a helium atmosphere for up to 35 h in the temperature range 1050–1350‡C.
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