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High-temperature oxidation and corrosion resistant coating alloy and coating

A high-temperature anti-oxidation and anti-corrosion coating technology, which is applied in the fields of high-temperature turbine working blades, high-temperature anti-oxidation and anti-corrosion coating alloys and coatings, can solve problems such as high-temperature anti-oxidation and anti-corrosion coating systems that have not yet been developed, and achieve Better anti-oxidation and corrosion effect, strong anti-oxidation and corrosion resistance at high temperature, and simple alloy composition

Active Publication Date: 2018-11-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, MCrAlY coatings with various components have been independently developed and imitated in China, but a coating system that has both high temperature oxidation resistance and corrosion resistance in a wide temperature range and different corrosion conditions has not been developed.

Method used

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  • High-temperature oxidation and corrosion resistant coating alloy and coating
  • High-temperature oxidation and corrosion resistant coating alloy and coating
  • High-temperature oxidation and corrosion resistant coating alloy and coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In this embodiment, the alloy composition of the coating after vacuum melting is shown in Table 1; the mold shell material of the cathode target casting is alumina, the mold shell roasting temperature is 900 ° C, the roasting time is not less than 4 hours, the refining temperature is 1000 ° C, pouring The temperature is 950°C. Castings are machined into qualified targets. Coating preparation process such as figure 2 shown. A test piece coated with AlNiY coating and heat-treated, bent at 90° for inspection, such as image 3 As shown, the coating has cracked, but there is no phenomenon such as peeling and peeling. The above inspection results meet the inspection requirements for the coating appearance quality and coating thickness, as well as the inspection requirements for the adhesion of the coating.

[0047] Table 1 Embodiment 1 coating alloy chemical composition (wt%)

[0048] Ni

Embodiment 2

[0050] In this embodiment, the coating alloy composition after vacuum smelting is shown in Table 2; the mold shell material of the cathode target casting is alumina, the mold shell roasting temperature is 800°C, the roasting time is not less than 4 hours, and the alloy refining temperature is 1000°C °C, the pouring temperature is 900 °C. The casting is machined into a qualified cathode target. Coating preparation process such as figure 2 shown. The XRD analysis results of AlNiY coating oxidation at 900 °C and 1000 °C are as follows Figure 4 shown. AlNiY coating was oxidized at 900℃ for 100h. Compared with the coating before oxidation, the structure of the coating did not change much. The XRD analysis results show that the coating is divided into two layers, the outer layer is a single-phase β-NiAl, and the diffusion layer is composed of a β-NiAl phase and a small granular white carbide precipitate, but the granular white carbide aggregates and grows . With the prolonga...

Embodiment 3

[0054] In this embodiment, the alloy composition of the coating after vacuum melting is shown in Table 3; the mold shell material of the cathode target casting is alumina, the mold shell roasting temperature is 880°C, the roasting time is not less than 4 hours, and the alloy refining temperature is 950°C , The pouring temperature is 900°C. The casting is machined into a qualified cathode target.

[0055] AlNiY coating preparation process such as figure 2 shown. Figure 5 It is the surface oxide morphology of the AlNiY coating after oxidation at 1000 °C for different times. After oxidizing for 10h, uniform needle-like θ-Al was formed on the surface 2 o 3 ( Figure 5 a); Oxidation 100h, θ-Al 2 o 3 Grow into a typical needle flake ( Figure 5 b) After oxidation for 1100h, most of the needle-like oxides on the surface of DD32 aluminized coating have been transformed into equiaxed α-Al 2 o 3 , indicating that the θ→α-Al 2 o 3 Phase transition, but needle flake θ-Al can...

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Abstract

The invention discloses a high-temperature oxidation and corrosion resistant coating alloy and a coating, and belongs to the technical field of high-temperature oxidation and corrosion resistant coating. The coating alloy is AlNiY alloy which is prepared from the following chemical components in percentage by weight: 13-16% of Ni, 1.2-1.8% of Y, less than 0.6% of Fe and the balance of Al and unavoidable impurities. The coating alloy is prepared into a target material, and a high-temperature oxidation and corrosion resistant coating is prepared on a to-be-protected workpiece by a cathode ion plating method. The coating alloy disclosed by the invention has simple composition, but the prepared coating has high resistance to high-temperature oxidation and corrosion.

Description

technical field [0001] The invention relates to the technical field of high-temperature oxidation-resistant and corrosion-resistant coatings, in particular to a high-temperature oxidation-resistant and corrosion-resistant coating alloy and a coating, and the alloy coating is applied to high-temperature turbine working blades. Background technique [0002] With the increasing working temperature of gas turbine engines, superalloy parts must have sufficient strength and good resistance to high temperature oxidation and corrosion. In order to ensure the high-temperature mechanical properties of superalloys and improve the long-term microstructure stability of alloys at high temperatures, new superalloys tend to further reduce the Cr content. This virtually also reduces the oxidation resistance and hot corrosion resistance of the alloy. Therefore, it is difficult to take into account the mechanical properties and high temperature chemical stability of the alloy at the same time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C23C14/32C23C14/14
CPCC22C21/00C23C14/14C23C14/32
Inventor 于金江孙晓峰周亦胄王猛孟杰娄建新
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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