A method of forming a layer of oxide on a permeable component made of a material or a stack of materials that is stable at 400°C, said component comprising an outer surface to be coated and at least one pore having diameter between 50 and 1000 μm unblocking at said outer surface, comprising the following steps: a) Injecting a carrier gas loaded with droplets of at least one precursor of the oxide in a low-pressure plasma inside an enclosure of a plasma reactor housing the component to be coated, and injecting a fluid passing through the permeable component and flowing in the gaseous state through at least one pore with flow opposite that of the carrier gas in the plasma chamber to prevent clogging the pore, the pressure and the mass flow rate of said fluid upstream of the permeable component being such that the pressure of the gas at the outlet of the at least one pore is greater than the pressure in the plasma chamber and that the injection mass flow rate of the fluid passing through the permeable component is: α) less than or equal to the mass flow rate of the carrier gas loaded with oxide precursors injected into the plasma chamber; and β) greater than or equal to the product of the mass flow rate of the carrier gas loaded with oxide precursors injected into the plasma chamber by the ratio between the total surface area of the open pores of the permeable component and the surface area of the passage section of the plasma chamber; accordingly, the speed of the gas at the outlet of the at least one pore is greater than or equal to the intake speed of the carrier gas loaded with at least one precursor of the oxide in any of these states - liquid, gel or solid - on the outer surface of the component, b) Injecting a carrier gas not loaded with oxide precursor in a plasma within the plasma chamber, injecting the fluid passing through the permeable component being maintained steps a) and b) being repeated, to form on the outer surface said oxide, the diameter of the at least one pore being preserved. a) Injecting a carrier gas loaded with droplets of at least one precursor of the oxide in a low-pressure plasma inside an enclosure of a plasma reactor housing the component to be coated, and injecting a fluid passing through the permeable component and flowing in the gaseous state through at least one pore with flow opposite that of the carrier gas in the plasma chamber to prevent clogging the pore, the pressure and the mass flow rate of said fluid upstream of the permeable component being such that the pressure of the gas at the outlet of the at least one pore is greater than the pressure in the plasma chamber and that the injection mass flow rate of the fluid passing through the permeable component is: α) less than or equal to the mass flow rate of the carrier gas loaded with oxide precursors injected into the plasma chamber; and β) greater than or equal to the product of the mass flow rate of the carrier gas loaded with oxide precursors injected into the plasma chamber by the ratio between the total surface area of the open pores of the permeable component and the surface area of the passage section of the plasma chamber; accordingly, the speed of the gas at the outlet of the at least one pore is greater than or equal to the intake speed of the carrier gas loaded with at least one precursor of the oxide in any of these states - liquid, gel or solid - on the outer surface of the component, α) less than or equal to the mass flow rate of the carrier gas loaded with oxide precursors injected into the plasma chamber; and β) greater than or equal to the product of the mass flow rate of the carrier gas loaded with oxide precursors injected into the plasma chamber by the ratio between the total surface area of the open pores of the permeable component and the surface area of the passage section of the plasma chamber; b) Injecting a carrier gas not loaded with oxide precursor in a plasma within the plasma chamber, injecting the fluid passing through the permeable component being maintained