SU1729795A1 - Multilayer heat protection material and process for its production - Google Patents

Abstract

The invention relates to powder metallurgy. The proposed material contains a substrate, a bonding metal layer containing stabilized zirconia, metal-ceramic and ceramic layers. In the cermet layer, particles of zirconium oxide are plated with an alloy of the system nickel-aluminum-silicon with the following composition of cermet, wt%: zirconium oxide 20-55. The said alloy 45-80, the invention relates to powder metallurgy, in particular, to multilayer heat-shielding material and a method for its preparation, used for thermal protection of engine parts of its internal, wound and gas turbine engines. The aim of the invention is to increase the heat resistance and corrosion resistance of a heat-shielding material. The heat-shielding g-material is characterized by the fact that it contains a substrate, a bonding metal layer, metal, and the alloy contains aluminum and nickel intermetallics in an amount of 90-97 wt.%, Silicon and nickel intermetallics in an amount of 2-6 wt.%, The rest is nickel. The ceramic layer contains particles of stabilized zirconium oxide, clad with nickel oxide, in the following ratio of components in the ceramic layer, wt%: zirconium oxide 65-85, nickel oxide 15-35. The method of obtaining a multilayer heat-insulating material involves preparing the initial powders of zirconium oxide by activating its surface with carbon and cladding an alloy of nickel-aluminum-silicon or nickel. After pretreatment, a bonding layer of a heat resistant alloy powder, a layer of matelo ceramics of zirconium oxide powder clad with a nickel-aluminum-silicon system alloy is sprayed onto the substrate, then an outer ceramic layer of nickel-clad oxide powder is sprayed, and after the outer layer is sprayed oxidative annealing is carried out at 700-1000 ° C. 2 tab. Ramic and ceramic layers containing stabilized zirconium oxide. At the same time, in the cermet layer, particles of zirconium oxide are plated with an alloy containing nickel, aluminum and silicon with the following composition of cermet, wt% zirconium oxide 20-55; alloy 45-80, with the alloy containing intermetallic compounds of aluminum and nickel 90-97, intermetallic compounds of silicon and nickel 2-6, and nickel else. The ceramic layer contains stabilized zirconia particles, clad N ko o vj u el

Description

Nickel oxide, in the following ratio of components, wt.% Zirconia 65-85 and Nickel oxide 15-35,

The method of obtaining a multilayer heat-shielding material includes the preparation of the initial powders, pretreatment of the substrate and sequential plasma spraying on the substrate of the bonding layer from a powder of a heat-resistant alloy, then a cermet layer and an outer ceramic layer. The preparation of the powder for spraying the cermet and outer layers is carried out by activating the surface of the particles of zirconium oxide powder with carbon and cladding with a nickel-aluminum-silicon alloy or nickel system, and after spraying the outer layer, oxidative annealing is performed at 700–1000 ° C,

Example. The stabilized zirconia powder was activated with carbon, clad with a nickel-aluminum-silicon system alloy and used to spray a metal-ceramic layer.

The stabilized zirconia powder was activated with carbon, clad with nickel and used to spray the outer layer.

The heat-resistant alloy substrate was subjected to degreasing and sandblasting, after which a binding layer was applied from the heat-resistant alloy powder, for example, nickel-chromium systems, metal ceramics layer and the outer layer, then produced oxidative annealing at 700–1000 ° С.

Table 1 shows the compositions of the proposed multilayer heat-shielding material and its properties in comparison with the properties of a known material.

Table 2 shows the properties of the heat-shielding material depending on the conditions of its preparation.

As follows from the data in Tables 1 and 2, the proposed heat-shielding material (compounds 1-9) and the method for its preparation (examples 1-5) are provided in comparison with the known heat-shielding material (compositions 10. 11) and its method

obtaining (examples 6, 7) increase in heat resistance and corrosion resistance.

Claims (2)

Claims 1. Multi-layered heat-shielding material comprising a binder substrate. a metal layer and a zirconia-stabilized metal-ceramic and outer ceramic layer, characterized in that, in order to improve thermal and corrosion resistance; In the cermet layer, particles of zirconium oxide are plated with an alloy containing nickel, aluminum and silicon in the following ratio of components of the cermet layer, wt%: Zirconium oxide 20-55; Alloy containing nickel, aluminum and silicon45-80; moreover, the alloy contains, wt%: Intermetallic aluminum and nickel 90-97; Silicon and nickel intermetallic compounds 2-6; Nickel Else, and the outer ceramic layer contains particles of zirconium oxide coated with nickel oxide, in the following ratio of components of the ceramic layer, wt.%: Zirconium oxide 65-85; Nickel oxide 15-35 2. A method for producing a multi-layered heat-shielding material, including preparing the initial powders, pre-treating the substrate and sequential plasma spraying onto the substrate of the bonding layer and the outer ceramic layer, from this and that, in order to increase the heat and corrosion resistance, the preparation of powders for spraying the cermet and outer layers is carried out by activating the surface of the particles of zirconium oxide powder with carbon and cladding the powder of the cermet layer with an alloy, containing nickel, aluminum, silicon, and the powder of the outer layer of the nickel, and after spraying the outer layer, oxidative annealing is carried out at 700-1000 ° C. table 2