High temperature metal product and method thereof

 

(57) Abstract:

The invention relates to metallurgy, particularly to a method of obtaining high temperature metal products. The inventive method comprises the deposition on the surface of high-temperature metal products for at least the first layer of the first metal deposition on the surface of at least the second layer of the second metal. The second layer of the second metal is precipitated at a depth sufficient to provide a predetermined molar ratio of the first and second metals, thus carry out the reaction processing, providing the integration of the first and second metals, forming intermetallic diffusion barrier layer. Get a high-temperature metal product, which has a total thickness of the diffusion barrier layer or layers of 0.1 - 10 μm, preferably from 0.8 to 3.0 μm. The use of the invention provides a uniform protective coatings for high temperature metal products. 2 C. and 7 C.p. f-crystals, 1 tab., 1 Il.

The present invention relates to high-temperature metal product and method of its production.

A useful application of m is such as prolonged exposure to high temperatures and alternating temperatures, which take place in gas turbine engines, the deterioration of environmental conditions can be very significant.

For many years the technology has developed various protective coatings to prolong working life and/or increase the maximum allowable operating temperature of many materials. However, the coating selected for specific applications, for example, coatings having good resistance to oxidation or corrosion, are not necessarily compatible with the substrate material to which they are applied. In many cases there is a possibility of unwanted interaction between the substrate and the coating composition, resulting in worse physical and mechanical properties of the substrate. The destruction of metallic materials is accelerated at elevated operating temperatures.

The formation of intermetallic protective layers of the high-temperature components is known from Japanese patent N 570155364, where intermittent intermetallic phase PtAl2thickness of about 35-50 m is formed as a result of the diffusion process layout plating at a temperature of 1150oC. high-Temperature materials - those materials which are capable of withstanding t is CI.

In the published international patent application WO 89/07159 from 10.08.89, CL 23 C 28/02 disclosed is a method of obtaining high temperature metal products, including deposition on the surface of high-temperature metal products two layers, each of which contains more than two metal so formed several intermetallic compounds.

Various formed intermetallic compounds provide varying degrees of protection of the substrate material. This protective coating does not provide the same degree of protection for the whole of the substrate material.

The technical result of the present invention is to provide a method of obtaining high temperature metal products, providing a uniform protective coating for high-temperature components.

This technical result is achieved in that in the method of obtaining high temperature metal products, including deposition on the surface of high-temperature metal products, at least the first layer of the first metal deposition on the surface, at least a second metal, according to the invention, the second layer of the second metal precipitated in depth the effect of the reaction processing providing the integration of the first and second metals, forming intermetallic diffusion barrier layer.

The term "metal" is used to identify substrates made of metal, intermetallic materials or alloys.

According to the present invention provide for applying a solid uniform diffusion barrier layer (barrier) as an intermediate layer between the protective coating and the surface temperature of the substrate material. The diffusion barrier layer serves to prevent the destruction of the protective coating system by minimizing interactions coating/substrate so that the effectiveness of the protective coating is maintained even if the coating composition may be disturbed (changed) because of losses due to surface oxidation/corrosion. The diffusion barrier layer also contributes to maintaining the physical and mechanical properties of the substrate due to the limitation of undesirable interactions.

In particular, the method based on the formation in place a solid stable diffusion barrier layer by the subsequent grease the barrier layer of the intermetallic forms. This invention also extends to a diffusion blocking layers consisting of numerous intermetallic layers, each of which restricts the diffusion of a specific element (or elements) and not necessarily limited to the formation of one intermetallic diffusion barrier layer of a homogeneous structure. By selection of the corresponding intermetallic varieties mutual diffusion of the protective coating through the barrier layer can be minimized.

In some cases, it may be advantageous to use several successive stages of deposition to form the required thickness of the first and second metals to the reaction processing.

You can optionally surround the one or more layers of any metal and to carry out the reaction processing, ensuring the formation of multiple sequential diffusion blocking layers of different compositions, preventing diffusion due to the diversity of their species.

It is desirable that the reaction treatment consisted of heating the deposited layers to a temperature sufficient for the implementation of the exothermic reaction between the metals alocale thermal excitation of deposited layers by processing the surface of a high energy, for example, a laser beam or plasma.

It is expedient to provide for the formation of a complete protective system on the topmost layer of the diffusion barrier layer or layers before reaction treatment was applied finishes and produced on the spot reaction treatment formed a complete protective system consisting of a substrate metal products, a diffusion barrier layer or layers and final coating.

Preferably the reaction, the treatment can be done in the face of pressure equal to ambient pressure.

This technical result is achieved by the fact that high-temperature metal product according to the invention, obtained as described above and has a total thickness of the diffusion barrier layer or layers is between 0.1 and 10 microns.

It is advisable that the total thickness of the diffusion barrier layer or layers was equal to from 0.8 to 3.0 μm.

Hereinafter the invention will be described by example with reference to the drawing which is a diagram of the sequence of steps required to implement the method according to the invention.

As shown in the drawing, Fig. 1, stage 1 represents the deposition of the first with the Oh for reacts thermal diffusion locking cover and the stoichiometric ratio of metal "A", contained in the coating.

The second stage is the deposition of the second metal "B" on the first layer deposited on the first stage. Here also, the thickness tBthis second layer is a function of the thickness for the final heat diffusion barrier layer and the stoichiometric ratio of contained metal "B".

Stage 3 is the stage of the reaction processing, resulting in the connection of two discrete layers of metals "A" and "B" in one diffusion barrier layer of intermetall "AB".

Taking into account the fact that the resulting reaction diffusion barrier layer AxByis the stoichiometric intermetallic product, to obtain the desired stoichiometry, it must contain proportional to the number x of moles of metal "A" and "y" of moles of metal "B". If the corresponding values of the atomic weight (M) of both metals is equal to MAand MBand the values of their density (p)-pAand pBin this case, the ratio of thickness tAand tBshould be equal to the same ratio as:

xMAyMB< / BR>
pApB< / BR>
This relationship suggests that the thickness of the right of proportional associated with the interactions of the solid/gas or solid/solid. Where there is a depletion to a certain extent, should be made an appropriate adjustment of the relative thickness of the respective layer or layers.

Example 1

The above-described method was successfully applied to the substrate is a titanium alloy, industrial known under the brand name M. In this case, the diffusion barrier layer was necessary as an intermediate layer between the substrate and resistant to oxidation coating. The goal is resistant to oxidation coating was to prevent the entry of oxygen, thereby limiting the formation of brittle surface layer, which is otherwise the case can significantly degrade the mechanical properties of the titanium substrate.

The sequence outlined above steps used to form the intermetallic layer PtAl2on the basis of the reaction of the sequential deposition of Pt and Al layers using the atomization method when the DC offset on the surface layer.

In order to reduce to a minimum the potential interactions of solid/solid material between the substrate and the first metal "A", especially due to the high diffusion coefficient of aluminosis according to the relation:

< / BR>
(recall that for the Pt-Al2x=1 and y=2).

Depletion of the outer aluminum layer due to oxidation by atmospheric air were not allowed due to the fact that the reaction processing was carried out under conditions of moderate vacuum at approximately 2.0 to 10-5bar. In this case, the processing was heated for 2 hours at a temperature of 750oC. Diffraction analysis x-ray surface diffusion locking cover confirmed that the desired crystalline morphology PtAl2.

The so formed solid intermetallic layer PtAl2then covered resistant to oxidation by a layer of Ni/Cr 80/20. Oxidative heat treatment for 100 hours in air at 700oC subsequently showed full efficacy layer PtAl2as a diffusion barrier layer for Nickel. Moreover, etching the substrate surface showed no signs of a surface layer, confirming the effectiveness of the layer Ni/Cr as a barrier layer preventing oxidation.

Other intermetallic compounds formed as a diffusion blocking layer on the substrate P are TiAl and (PtTi2served as a diffusion blocking layer for each of the substrates NiCr, NiCrAl, NiAl and Ni.

After the formation of the diffusion barrier layer on the substrate NiCr and NiAl and use final coating each sample was subjected to oxidative heat treatment for 80 minutes at 1050oC and for 40 minutes at 1150oC. Diffusion barrier layer (PtTi3+TiAl) on the substrate mark M were subjected to oxidative heat treatment at 700oC for 100 hours. Each of the treatments demonstrated the effectiveness of the respective diffusion blocking layer.

The substrate for intermetallic diffusion blocking layers PtAl3and TiAl was formed from a titanium-aluminum alloys.

The following table illustrates the formation of a diffusion barrier layer for a particular substrate materials with the corresponding normal thickness of the diffusion blocking layer, and with an effective test conditions.

1. The method of obtaining high temperature metal products, including deposition on the surface of high-temperature metal products for at least the first layer of the first metal, the wasp is the second metal precipitated on the depth, sufficient to provide a predetermined molar ratio of the first and second metals, and carry out the reaction processing, providing the integration of the first and second metals, forming intermetallic diffusion barrier layer.

2. The method according to p. 1, characterized in that for the formation of the required thickness of the first and second metals before reaction treatment is carried out several successive stages of deposition.

3. The method according to any of paragraphs.1 to 2, characterized in that it further precipitated by one or more layers of any metal and carry out the reaction processing, ensuring the formation of multiple sequential diffusion blocking layers of different compositions, preventing diffusion due to the diversity of their species.

4. The method according to any of paragraphs.1 to 3, characterized in that the reaction processing includes heating the deposited layers to a temperature sufficient for the implementation of the exothermic reaction between the metals or each diffusion barrier layer.

5. The method according to any of paragraphs.1 to 4, characterized in that the reaction processing includes thermal excitation of deposited layers the way the PP.1 - 5, characterized in that for the formation of a complete protective system on the topmost layer of the diffusion barrier layer or layers before the reaction processing is applied finishes and produce on the spot reaction processing educated a complete protective system consisting of a substrate metal products, a diffusion barrier layer or layers and final coating.

7. The method according to any of paragraphs.1 - 6, characterized in that the reaction treatment is carried out under conditions of pressure equal to ambient pressure.

8. High temperature metal product, characterized in that it is obtained by the method according to any of the preceding paragraphs.1 to 7 and has a total thickness of the diffusion barrier layer or layers of 0.1 to 10.0 μm.

9. High temperature metal product under item 8, characterized in that the total thickness of the diffusion barrier layer or layers is equal to from 0.8 to 3.0 μm.

 

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