STÖHR BRITTA (DE)
| WO2018184782A1 | 2018-10-11 | |||
| WO2016120068A1 | 2016-08-04 |
| US20170282310A1 | 2017-10-05 | |||
| US20160289844A1 | 2016-10-06 | |||
| CN103214260B | 2014-08-20 | |||
| EP3168204A1 | 2017-05-17 |
| Patent claims 1. Component (1, 1') with a base (4, 4') of a nickel or cobalt based super alloy which has an area (7, 1'), which receives a structural element (10, 10')/ especially which (7) was molded out or machined because of a defect, which receives a coupon as a structural element (10, 10') different from the base material and which comprises a MAX phase. 2. Method to repair or to modular build-up a component (1, 1') with a base (4, 4') of a nickel or cobalt based sup eralloy, wherein a MAX phase coupon (10, 10') is used as at least one module of the component. 3. Component or method according to claim 1 or 2, wherein the base material is IN939. 4. Component or method according to any of the claims 1, 2 or 3 , wherein the MAX phase comprises NbAlC, CrAlC and/or Ti2AlC . |
The invention relates to MAX phase coupons for high tempera ture applications.
Due to the continuously increasing temperatures in stationary gas turbines the oxidation and corrosion resistance is becom ing more and more important. In some cases of the new high temperatures machines, first simulations of the service con ditions show, that some components could run into oxidation issues. This is very critical at the first refurbishment of these components. The trailing edge (TE) of the above men tioned component is extremely thin so there could be a risk of component damage during service, resulting in decreased efficiency .
Massive bulk parts of MAX phases are state of the art.
Is therefore the aim of the invention to overcome the prob lems mentioned above.
The problem is solved by a component with the MAX phase cou pon according to claim 1 and a method according to claim 2.
In the dependent claims further advantageous features are listed which can be arbitrarily combined with each other to yield further advantages.
The figures 1, 2 show components with a coupon and
figure 3 a list of superalloys.
It is proposed to use a coupon which is made of a MAX phase material, which is especially sintered. MAX phases are a new class of materials with properties between those of ceramics and metals. Due to their combination of properties, like high thermal and electrical conductivity, damage tolerant, re- sistant to thermal shocks, machinability, oxidation and cor rosion resistant, low density, low CTE they are very attrac tive as hot section turbine materials.
Currently, NbAlC, CrAlC and TiAlC as typical MAX phases are investigated with regard to their mechanical properties, coating behavior and weldability. NbAlC could be an appro priate material for the TE coupon due to its excellent high temperature capability and mechanical strength. If required, the NbAlC coupon can be coated with CrAlC as CrAlC further improved oxidations resistance compared to the NbAlC. MAX phase coupons can also be applied in other critical areas.
The use of MAX phase materials for high temperature compo nents and combination of nickel or cobalt base alloys is com pletely new.
The advantages are:
- Extended lifetime of high temperature components -> reduced life cycle costs
- Increase of repair scope -> service upgrades
- Extended lifetime of high temperature components -> reduced life cycle costs.
The description and the figures are only examples of the in vention .
Figure 1 shows a component 1 which has a mold 7 or an area 7 which had a defect, which was removed or machined out.
The geometry of the mold 7 is measured or somehow known or adapted and accordingly coupon 10 as a structural element made of, especially consisting of MAX phase is produced.
In a final step a joining step between the coupon 10 and the base 4 will be performed to obtain the component 1.
The material of the base 4 is a nickel or cobalt based super alloy, especially according to figure 3 IN939. Figure 2 shows a cross section of an airfoil section 11 of an another component 1 with an area 1 .
A MAX phase coupon 10' is used as leading edge 12 because of the better properties.
The coupons 10, 10' are joined, especially by brazing to the substrate 4, 4' (fig. 1, 2) .
Known brazes of the state of the art can be used to join MAX phase and metallic base 4.