The spraying method is based on the nitrogen impulse plasma treating of commercial AIN powder contaminated with oxygen. The powder is introduced into an impulse plasma accelerator in which electric discharge occurs under 100 Pa pressure. The plasma packed thus produced is nonisothermic and entirely ionzed. The energy relased in one 100 ms impulse is 1 kJ. As a result of the plasma - chemical treatment of a commercial AIN powder, a solid finegrainer aluminium nitride („oxygen free”) coating was formed.