Process for coating a workpiece with a protective coating against oxidation by a technique of chemical deposition in vapor phase, and coating and part

摘要

Process for preparing a multilayer protective coating against oxidation on at least one surface of at least one part of at least one material capable of being oxidized, in which the following successive steps are performed: a) is deposited on the surface a layer of a catalyst which allows the growth of short fibers of a ceramic resists oxidation; b) is grown on the surface by a chemical deposition process in vapor phase CVD process or a chemical infiltration vapor CVI, a first layer consisting of particles of a ceramic resists oxidation, said particles comprising a majority of short fibers of a ceramic resists oxidation; c) the first layer is coated by a process of chemical deposition in vapor phase CVD process or a chemical infiltration vapor CVI fully homogeneously fiber to fiber without leaving porosities, with a second layer of a ceramic refractory; d) the second layer is coated by a chemical deposition process in vapor phase CVD process or a chemical infiltration CVI vapor phase with a third layer of a ceramic resists oxidation; e) optionally, the third layer is coated by a chemical deposition process in vapor phase CVD process or a chemical vapor infiltration CVI phase, with a fourth layer of a refractory ceramic; f) optionally, the fourth layer is coated by a chemical deposition process in vapor phase CVD process or a chemical vapor infiltration CVI phase, a fifth layer of a ceramic resists oxidation; g) optionally are repeated 1 to 100 times, preferably 1 to 50 times, the steps e) and f); h) the workpiece coated on at least one surface with a refractory coating protection against oxidation, said coating a three-dimensional microstructure to the third to fifth layer or any layer is recovered; It is the ceramic resists oxidation of different refractory ceramic.