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Oxidation resistant nickel alloy

A nickel alloy, anti-oxidation technology, applied in instruments, measuring heat, thermoelectric devices, etc., can solve problems such as thermocouple wire damage, and achieve the effect of improving oxidation resistance

Inactive Publication Date: 2014-02-19
ANSALDO ENERGIA IP UK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thermocouple wires may break mechanically due to the alternating strain imposed during thermal cycling

Method used

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  • Oxidation resistant nickel alloy
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Experimental program
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Embodiment Construction

[0017] The invention is explained in more detail below on the basis of exemplary embodiments and figures.

[0018] Table 1 lists the respective chemical compositions of the tested alloys. Alloy components are calculated in % by weight.

[0019] Table 1: Chemical composition of the alloys tested

[0020]

[0021] Alloy Nisil-M1 is the alloy of the present invention, and the other five alloys are commercially available materials in this field. This is a microalloyed Nisil with additions of 0.1 Y, 0.1 Hf and very high Cr content (6%). The biggest advantage of Nisil-Ml is that there is no change in thermal expansion properties compared to Nisil.

[0022] Different materials with nominal compositions in Table 1 (without ) button-sized samples were prepared by melting in an electric arc furnace. The chemistry of Nisil-Ml is designed to have both improved oxidation resistance and a similar coefficient of thermal expansion to thermocouple wires made from Nisil or Nicrosil. T...

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Abstract

The present invention relates to an oxidation resistant nickel alloy, characterized by comprising the following chemical composition (in % by weight): 4-7 Cr, 4-5 Si, 0.1-0.2 Y, 0.1-0.2 Mg, 0.1-0.2 Hf, remainder Ni and unavoidable impurities. A preferred embodiment has the following chemical composition (in % by weight): 6 Cr, 4.4 Si, 0.1 Y, 0.15 Mg, 0.1 Hf, remainder Ni and unavoidable impurities. This alloy has an improved oxidation resistance, good creep properties at high temperatures and.

Description

technical field [0001] The present invention relates to an N-type thermocouple sheath exposed to an oxidizing atmosphere at an extremely high temperature of about 1100°C. Such harsh operational requirements occur, for example, when measuring temperatures in modern gas turbines. In particular, the present invention relates to an oxidation-resistant Ni alloy having improved creep properties. Background technique [0002] Gas turbines of the applicant's GT24 / GT26 type known from the prior art operate on the principle of continuous combustion. This means that the compressed air is heated in the first combustion chamber by adding approximately 50% of the total fuel (by base load). After the ratio, the combustion gases expand through the first turbine (single-stage high-pressure turbine), reducing the pressure approximately by a factor of 2. The remaining fuel is then fed to the second combustion chamber where the combustion gases are heated a second time to the highest turbine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05G01K1/08G01K1/12H10N10/00
CPCC22C19/058H01L35/00G01K1/10C22C19/05
Inventor M·Y·纳滋米A·库恩滋勒H·津恩G·班迪伊拉
Owner ANSALDO ENERGIA IP UK LTD