Heat-resistant alloy based on aluminum

 

(57) Abstract:

Heat-resistant alloy based on aluminum for plasma coatings heat resistant Nickel-based alloys contain, %: chrome 20-24, cobalt 10-13, yttrium 13,5-17, aluminum - rest. The alloy has high corrosion resistance that makes it suitable for plasma coatings heat resistant alloys Nickel-based, operating in harsh environments and high temperatures. table 1.

The invention relates to the field of corrosion protection and can be used to obtain a heat-resistant alloys based on aluminum for plasma coatings heat resistant Nickel-based alloys.

Known corrosion resistant coating containing cobalt, chromium, aluminum, yttrium and Nickel /1/. The disadvantage of it is that these elements have an effect on the matrix separately, not providing high heat resistance of the coating.

Known Nickel-chromium aluminide composition NiAl1,03Cr0,14/2/ used as a heat-resistant material with a plasma-laser doping of structural steels. The disadvantage of this Nickel-chromium aluminide is that its oxidation at temperatures above 900the e aluminum of the following composition, %: 0.5 to 35 chromium, 0.5 to 35,0 cobalt, 0.5 to 25 yttrium, aluminum else /3/.

The disadvantage of this alloy is a wide range of ingredients of the alloy, which will not allow to receive high anti-corrosion properties throughout the claimed range of compositions.

Known heat-resistant alloy based on aluminum plasma coatings on gas turbine blades (prototype) containing, wt.%: 80 - aluminum, 5 to 15 silicon and/or copper and/or manganese and/or molybdenum and/or Nickel - rest /4/.

The disadvantage of the prototype is very high aluminum content, and hence a low melting point alloy. In addition, it includes no such corrosion-resistant components, such as chromium, cobalt, yttrium. In General, this alloy can provide high corrosion resistance coatings for components operating in high temperature environments in long mode.

Object of the present invention is to provide a heat-resistant alloy based on aluminum, with high corrosion resistance that can be used as the material for the plasma coating of heat-resistant alloys based on Nickel, working in harsh environments and high tempered coating heat-resistant Nickel-based alloys, containing aluminum, according to the invention additionally contains chromium, cobalt, yttrium in the following ratio, wt.%:

chrome - 20,0 - 24,0

cobalt - 10,0 - 13,0

yttrium - 13,5 - 17,0

aluminum - rest

We offer alloy based on aluminum has high corrosion resistance due to the presence of alloying elements: chromium, cobalt, yttrium and can improve the corrosion resistance of the matrix is covered with a metal working in harsh environments for a long time.

The alloy was prepared as follows. The source material purity not less than 99,90 - 99,92% is introduced into an electric arc vacuum furnace with copper furnace hearth and alloys when 1600-1675oC in a helium atmosphere at a pressure of 400 - 500 mm RT.article by triple melting within 20-30 minutes and cooling speeds of 20-40 degrees./C. then spend homogenizing vacuum annealing of the material obtained at 1000-1100oC for 18-20 hours. As a result of this technology be tight, shiny brittle alloy having a hardness as measured with the device PMT-3, equal 67010 kgf/mm2.

The obtained chromium-cobalt-yttrium-aluminum alloy is crushed, classified by size of total composition (%): C - of 0.15, Cr - 4,0, Co - 9,8, W - 8,3, Mo - 0,4, Al - 5,5, Nb - 1,2, Ta - 4,6, Re - 3,2, Ni - rest. Plasma spraying powder chromium-cobalt-yttrium-aluminum alloy on a single crystal sample consists of the following steps. Blasting the working surface of the sample, its degreasing, heat up to 120-170oC and coating thickness 70-110 µm 1-2 (3) pass the torch. After that, the surface of the samples was subjected to compaction by using shock glass microspheres with a diameter of 40 to 60 μm. The final operation is a two-stage diffusion annealing at 900oC for 3-4 h and secondary annealing at a temperature of 1100oC for 18-20 hours. In the atmosphere of helium or pure argon. The result of this processing is to obtain a two-layer surface samples, consisting of private coverage and the diffusion layer of the covering elements in the matrix metal. It is possible to obtain high work of adhesion of the coating to the matrix metal and the alloying elements of the alloy of the outer layers of the matrix a depth of 400-800 microns. Conducting after hours of testing samples in air at a temperature of 1000oC on the resistance showed high corrosion resistance, which can be seen in the following table.

Plav m-100, allows you to increase corrosion resistance single-crystal samples of alloy a HC-32 from 400 to 1200 hours, and more expensive chromium-cobalt-yttrium aluminide M38-100 (see table. ), i.e., 3 times. In addition, samples of pure LGL-32 (without coating) at a speed of 1600-1700 hours lose their geometry, crack and intensely oxidized, whereas the samples coated alloy m-100, despite the weight loss, do not have any defects before the end of the test. Moreover, loss of weight they are somewhat better than the coated samples chromium-cobalt-yttrium-aluminium. This difference is stable from beginning to end testing.

Thus, known from the patent alloy with a high content of aluminum will not allow to solve the task of providing high corrosion heat resistance, which guarantees declare us the composition of the alloy with defined within the contents of aluminum and the alloying components.

Heat-resistant alloy based on aluminum for plasma coatings heat resistant Nickel-based alloys containing aluminum, characterized in that it additionally contains chromium, cobalt and yttrium in the following ratio, wt.%:

Chrome - 20,0 - 24,0

Cobalt - 10,0 - 13,0

Yttrium - 13,5 - 17,0



 

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