Investigation results of structures, which appear on the surface of composition pressed material 80 % BaZrO3 – 20 % W during high-temperature processing at Al2O3 coating on its surface are presented. It has been found that large crystals of barium aluminate are formed in the area deposition of Al2O3. Loose islands of barium aluminate are formed on the surface of the composition material. Al2O3 diffuses to this surface, which undergo additional pulse electromagnetic fields influence. Islands formation takes place on the crystals of barium zirconate and barium oxide. Aluminum is not observed in the interior of composite.