Additively manufactured high-temperature component with film cooling

Abstract

Component (2) for use in a high-temperature environment, comprising: - a wall (1) having an outer surface (3) and an inner surface (4); - a cooling fluid outlet slot (5) in the wall (1), which opens at a slot angle (6) in a slot angle range of 10° to 90° to the outer surface (3) through a slot opening (7) in the outer surface (3) elongated in a slot width direction (9); and - at least one cooling fluid supply channel (8) opening into the wall (1) at the inner surface (4), which transitions into the cooling fluid outlet slot (5) in the wall (1); - wherein channel cross-sections (12) of the at least one cooling fluid supply channel (8) have their largest dimensions (10) along the slot width direction (9), the largest dimensions (10) increasing from the inner surface (4) to the outer surface (3) and extending at a first boundary line (13) and a second boundary line (14) end,which extend towards each other at an opening angle in an opening angle range of 10° to 30°, wherein the second boundary line (14) at the transition of the cooling fluid supply channel (8) into the cooling fluid outlet slot (5) extends parallel to the slot width direction (9) at an acute angle (16) in an angle range of 30° to 60°, the acute angle (16) opening towards the at least one cooling fluid supply channel (8), and wherein several cooling fluid supply channels (8) are arranged side by side in the direction of the greatest extensions of their channel cross-sections (12), characterized in that the several cooling fluid supply channels (8), which are arranged side by side in the direction of the greatest extensions of their channel cross-sections (12), transition into the cooling fluid outlet slot (5), wherein, in addition to the inlets of the cooling fluid supply channels (8) into the wall (1), support elements (22) are formed from the inner surface (4) of the wall (1). stand outwherein the support elements (22) are supported on a retaining wall (21) which runs at a distance from the wall (1) inside the component (2).

Description

TECHNICAL AREA OF INVENTION The invention relates to a component for use in a high-temperature environment, comprising a wall and a cooling fluid outlet slot in the wall, designed to form a cooling film of cooling fluid on the wall when the component is used in the high-temperature environment. This film ideally prevents direct contact between the wall and a high-temperature medium, in particular a hot gas flowing towards the wall, thereby minimizing the heat flow into the wall. More precisely, the invention relates to a component with the features of the preamble of independent claim 1. The component could be, for example, a turbine blade for a gas turbine or for an aircraft engine, but also a combustion chamber of a gas turbine. STATE OF THE ART US Patent 4,676,719 A discloses a blade for a gas turbine engine. One wall of the blade has a plurality of cooling fluid passages oriented longitudinally along the blade, the outlets of which are located on an outer surface of the wall over which a hot gas flows during operation. A longitudinal slot is formed in an inner surface of the wall. Each of the cooling fluid passages is connected to the longitudinal slot to receive cooling fluid. The cooling fluid emerges as a thin film on the outer surface of the component. The slot is formed into the inner surface of the wall during the casting of the blade, and the fluid passages are incorporated into the wall from the outside of the component by removing material. The cooling fluid passages begin at the longitudinal slot with a change in the direction of the cooling fluid and then feature a diffuser with an approximately rectangular cross-section, its greater extent being in the longitudinal direction.The diffusers of adjacent passages merge into a common coolant outlet slot in the outer surface of the component. The opening angle of the diffusers in the longitudinal direction is at least 30° and at most 56°. The common coolant outlet slot at the end of the passages exits the wall at a slot angle of no more than 40° and preferably 30° or less to the outer surface. US Patent 4,664,597 A discloses a blade for a turbomachine. A cooling fluid outlet slot extending longitudinally along the blade is formed in the outer surface of the blade wall. At its base, the cooling fluid outlet slot is connected to a plurality of cooling fluid passages arranged in a longitudinal row. Each cooling fluid passage is connected, via its smallest cross-section on the inner surface of the wall, to a cooling fluid chamber adjacent to the inner surface. Adjoining this chamber, towards the cooling fluid outlet slot, is a section of the cooling fluid passage with walls diverging both longitudinally and transversely, until the cooling fluid passage transitions smoothly into the cooling fluid outlet slot.The cooling fluid outlet slot and the cooling fluid passages are introduced into the wall of the component after casting, for example by Electro Discharge Machining (EDM) using an electrode that has the shape of the passages to be formed and the cooling fluid outlet slot. From EP 0 992 654 A2, a turbine blade for a gas turbine is known. Here, the cross-sectional area of ​​cooling fluid passages through the wall of the turbine blade decreases from its inner surface to its outer surface, although the cooling fluid passages, which begin individually on the inner surface of the wall, widen in the longitudinal direction of the turbine blade and merge into a common cooling fluid outlet slot that opens onto the outer surface of the wall at a certain angle. In one embodiment of the known component, the cooling fluid passages through the wall are curved around the longitudinal axis of the turbine blade. This allows the angle at which the common cooling fluid outlet slot opens to be reduced compared to cooling fluid passages running straight through the wall. This improves the contact of the cooling fluid flow with the outer surface located downstream of the cooling fluid outlet slot.While conventional manufacturing processes are considered unsuitable for creating curved cooling fluid passages, the curved shape of the cooling fluid passages through the wall is said to be achievable through investment casting. A curvature of the cooling fluid passages with the described cross-sectional profile through the wall is only possible in investment casting using expendable solid cores. In several well-known additive manufacturing processes for metal components in a powder bed, such as laser powder bed fusion (LPBF), selective laser melting (SLM), and electron beam melting (EBM), a layer of metal powder is locally melted using a radiation source (e.g., laser, arc, electron beam, etc.) to form a layer of the respective component. Then, another layer of metal powder is applied and also locally melted to form the next layer of the component, with this layer bonding to the layer below it in the area of ​​its mutual overlap. By repeating the application of layers of metal powder and the local melting of these layers along a manufacturing direction, the component is produced layer by layer. Other additive manufacturing processes for metal components without a powder bed, such as Directed Energy Deposition (DED) and Wire Arc Additive Manufacturing (WAAM), involve the deposition of powder or wire to create a component layer by layer. These processes can utilize the same radiation sources as described in the previous paragraph. These and other additive manufacturing processes for metal components enable the production of complexly shaped metal parts that cannot be coherently manufactured using other industrial methods, such as casting, even with subsequent machining. However, the production of metal components of arbitrary shapes is not possible with additive manufacturing. For example, difficulties arise when parts of a layer of metal powder are melted that do not directly border previously melted underlying layers of the component. This is because the heat introduced into the metal powder by the radiation source (e.g., laser) is then not dissipated through solid metal in the underlying layers.This can lead to unwanted melting of the metal powder over a larger area, extending uncontrollably into deeper layers of the powder. While this problem can be mitigated by reducing the energy input from the radiation source, this requires complex process control and results in slower production speeds. In the typical casting process for turbine blades with the features of the preamble of independent claim 1, it is known to not only rework the cast body by material removal processes such as milling, grinding, polishing, electro-discharge machining (EDM), or the like, but also to provide it with a high-temperature-resistant coating of a ceramic material. This coating can extend into previously introduced cooling fluid outlet slots and cooling fluid supply channels and, particularly in the case of shallow cooling fluid outlet slots and cooling fluid supply channels, can significantly increase the length ratio of the largest to the smallest dimension of the respective cross-section, because a coating of uniform thickness reduces the smallest dimension of the cross-section proportionally more than the largest dimension. TASK OF INVENTION The invention is based on the objective of providing a component for use in a high-temperature environment, comprising a wall, a cooling fluid outlet slot opening through an elongated slot opening in the outer surface of the wall, and at least one cooling fluid supply channel opening into the wall on an inner surface and transitioning into the cooling fluid outlet slot in the wall, which is particularly well suited for production by additive manufacturing processes and has particularly good prerequisites for its use in high-temperature environments. SOLUTION The object of the invention is achieved by a component having the features of independent claim 1. The dependent claims relate to preferred embodiments of the component according to the invention. A component with the features of the preamble of independent claim 1 is known from US patent 6,287,075 B1. A turbine blade has a leading edge and a trailing edge spaced apart in the axial direction of the turbine. A root and a tip of the turbine blade are spaced apart in the span direction. A first side and a second side of the turbine blade are spaced apart in the direction of turbine rotation. A cooling fluid system is arranged between the first and second sides, through which a cooling fluid is passed to cool the turbine blade. Several fan-shaped holes in the first sides are spaced apart along the span direction.A flow cross-section of each of the fan-shaped holes grows between an inlet on the cooling fluid piping system and an outlet on the first side, the outlet being coaxial with a central axis of the fan-shaped hole to generate a cooling fluid film from the outlet along the second side. The central axis of the fan-shaped holes is inclined at an acute angle to the span direction of the turbine blade, with the outlet being larger than the inlet in the span direction but essentially the same width as the inlet to achieve a large coverage along the span direction with the outlets and the films exiting them. In particular, the fan-shaped holes diverge exclusively along the span direction and symmetrically about their central axis.While the inlet is circular perpendicular to the central axis, the outlet is oval perpendicular to the central axis, with opposing arcuate sides and opposing straight sides. The central axis can be inclined at an acute angle to both the blade width direction and the axial direction between the leading and trailing edges of the turbine blade. From US 2006 / 0070315 A1, a gas turbine blade is known with a wall through which cooling fluid holes pass, the cross-section of which, perpendicular to its main extension direction, has the shape of an asymmetrically deformed ellipse. From EP 1 113 145 B1, a guide vane for a gas turbine is known, designed as a hollow profile bounded on the suction side by one wall and on the discharge side by another wall. In the rear section, the guide vane is bounded only by the two walls, which are connected by ribs interrupted in the radial direction of the gas turbine. Cooling channels run between the ribs. In the front section, the guide vane has an insert. Ribs also border the insert. Cooling air flowing between the insert and the ribs flows essentially in the axial direction of the gas turbine in channels between these ribs to the rear section of the guide vane. In its front section, however, the walls are provided with film perforations connected to the channels between the ribs, so that the cooling air also flows out through the film perforations. US Patent 2019 / 0071977 A1 discloses a turbine blade with cooling holes for a turbine engine. The cooling holes can have a diffuser area with an asymmetrical shape, such as an asymmetrical fan shape. The cooling holes can be formed by any suitable method, including casting, additive manufacturing, drilling, electrical discharge machining (EDM), and laser machining. DESCRIPTION OF THE INVENTION A component according to the invention for use in a high-temperature environment, which may be, for example, a turbine blade, has a wall with an outer surface and an inner surface. A cooling fluid outlet slot is formed in the wall, opening at a slot angle of 10° to 90° to the outer surface through a slot opening in the outer surface that is elongated in the slot width direction. If the cooling fluid outlet slot does not open at a leading edge of the component's outer surface exposed to the flow, but further downstream, the slot angle range typically extends from 10° to 60° and often only from 20° to 40°. At least one cooling fluid supply channel opens into the wall at the inner surface and transitions into the cooling fluid outlet slot within the wall.The cross-sectional areas of the at least one cooling fluid supply channel exhibit their greatest dimensions along the slot width direction. These greatest dimensions increase from the inner surface to the outer surface and terminate at a first boundary line and a second boundary line, which intersect at an angle of 10° to 30°. At the transition from the cooling fluid supply channel to the cooling fluid outlet slot, the second boundary line runs parallel to the slot width direction at an acute angle of 30° to 60°, with the acute angle opening towards the at least one cooling fluid supply channel.Despite the maximum opening angle of 30° between the first and second boundary lines, the acute angle of 30° to 60° between the second boundary line and the parallel to the slot width direction at the transition of the cooling fluid supply channel to the cooling fluid outlet slot means that the cooling fluid supply channel does not run perpendicularly, but at an angle significantly deviating from 90° to the parallel to the slot width direction. This unusual orientation of the cooling fluid supply channel results in a significant advantage in the production of the component according to the invention by additive manufacturing, in particular by powder bed-based additive manufacturing, with a manufacturing direction running in the slot width direction from the first boundary line to the second boundary line.The fact that the manufacturing direction in additive manufacturing of the component generally runs in the slot width direction results from the slot width direction regularly running in the longitudinal direction of the component, for example, in the radial extension direction of a turbine blade. Specifically, if manufacturing proceeds from the first boundary line to the second boundary line, and the second boundary line runs at an acute angle to the line parallel to the slot width direction, the upper end of the cooling fluid supply channel, which is located in the area of ​​the second boundary line during additive manufacturing, is always sufficiently thermally contacted by areas of the wall located further towards the inner surface. This allows for high manufacturing speed and high precision.Without the acute angle between the second boundary line and the parallel to the slot width direction, intolerable deviations from the desired shape of the cooling fluid supply channel often occur in additive manufacturing, and especially in powder bed-based additive manufacturing of the component. It is understood that the second boundary line preferably has an acute angle in the range of 30° to 60° to the local parallel to the slot width direction over the entire extent of the cooling fluid supply channel. If the second boundary line is a straight line, the acute angle of the second boundary line is everywhere that with the parallel to the slot width direction at the transition of the cooling fluid supply channel to the cooling fluid outlet slot. In principle, the first boundary line can be a straight line, and independently of this, the second boundary line can also be a straight line. However, one or both of the boundary lines can also have at least one curvature. Thus, the second boundary line can have such a curvature that the acute angle with the parallel to the slot width direction decreases from the inner surface to the outer surface.Alternatively or additionally, the first boundary line can have such a curvature that its obtuse angle to the line parallel to the slot width direction, which opens towards the at least one cooling fluid supply channel, decreases towards the outer surface. If both boundary lines are curved in this way, the at least one cooling fluid supply channel opens in a trumpet-like shape between the boundary lines. Alternatively or additionally, a surface in which the largest dimensions of the channel cross-sections of the at least one cooling fluid supply channel lie, or which, in other words, is defined by the largest dimensions of the channel cross-sections of the at least one cooling fluid supply channel, can have a curvature such that its surface angle to the outer surface at the slot opening decreases from the inner surface to the outer surface until it reaches the slot angle at the slot opening. With the curved surface, the slot surface angle to the outer surface at the slot opening is not constant, but varies. The variation is such that the slot surface angle to the outer surface decreases towards the outer surface. This allows for particularly small slot angles at the slot opening, which are advantageous for good contact of the cooling fluid exiting the slot opening with the downstream areas of the outer surface.The curved shape of the at least one cooling fluid supply channel and also of the subsequent cooling fluid outlet slot can be easily realized in additive manufacturing. The cross-sectional areas of the at least one cooling fluid supply channel can each be bounded by two parallel straight line segments, a first semi-ellipse connecting the straight line segments across the first boundary line, and a second semi-ellipse connecting the straight line segments across the second boundary line. When a semi-ellipse is mentioned here, this term, unless an excluding axis ratio to the principal axes of the semi-ellipse is specified, should include the possibility that the semi-ellipse is a semicircle. If both semi-ellipses are semicircles, the channel cross-section is bounded by a circumferential line of a so-called race track shape.Even if the semi-ellipses between the straight line segments have an axis ratio other than 1:1, the channel cross-sections are of simple geometric form that can be easily transformed into one another, so that the entire cooling fluid supply channel is easily defined for additive manufacturing. Preferably, the principal axes of the semi-ellipses, that is, their longer axes if they exist, are each aligned along the largest extent of the respective channel cross-section. The channel cross-sections then terminate in a pointed arc at the boundary lines of the largest extents. This is also advantageous for the additive manufacturing of the component according to the invention, because wall areas produced in new layers of the component are well contacted by underlying wall areas, so that heat introduced by laser light is dissipated in a controlled manner via these underlying wall areas. In one embodiment of the component according to the invention, the first axis ratio of the first semi-ellipse and the second axis ratio of the second semi-ellipse lie within an axis ratio range between 1.1:1 and 3:1, and preferably between 1.2:1 and 2:1 or between 1.5:1 and 2:1. In this embodiment, the respective channel cross-section terminates in a pointed arc at both ends of its greatest extent. The second axis ratio can be the same as the first axis ratio or it can differ from the first axis ratio. If such a deviation occurs, the second axis ratio will generally be larger than the first axis ratio. In a second embodiment of the component according to the invention, the definition of which overlaps with that of the first embodiment, the first axis ratio of the first semi-ellipse is at least 0.2 smaller than the second axis ratio of the second semi-ellipse, wherein the second axis ratio lies within an axis ratio range between 1.2:1 and 3:1. In this embodiment, the first semi-ellipse can be a semicircle. In any case, the axis ratio of the second semi-ellipse is significantly larger than the axis ratio of the first semi-ellipse. It is advantageous for both the manufacture of the component according to the invention and the flow through the cooling fluid supply channel if the area ratio of the channel cross-section at the transition of the at least one cooling fluid supply channel into the cooling fluid outlet slot to the channel cross-section at the entry of the at least one cooling fluid supply channel through the inner surface is in an area ratio range between 0.8:1 and 5:1 or between 0.8:1 and 3:1. If the area ratio is less than 1:1, the channel cross-sections converge in the direction from the inner surface to the outer surface of the wall. If the area ratio is greater than 1:1, the channel cross-sections diverge in this direction. In the component according to the invention, a slight convergence up to a moderate divergence of the channel cross-section is possible. In the component according to the invention, the inlet length ratio of the largest dimension to the smallest dimension of the channel cross-section at the entry of the at least one cooling fluid supply channel through the inner surface of the wall can be in an inlet length ratio range between 2:1 and 6:1, while the outlet length ratio of the largest dimension to the smallest dimension of the channel cross-section at the transition of the at least one cooling fluid supply channel into the cooling fluid outlet slot in the wall can be in an outlet length ratio range between 6:1 and 25:1 and preferably between 10:1 and 15:1. The length ratio of the slot opening is correspondingly even larger, particularly when, in the component according to the invention, several cooling fluid supply channels are arranged side by side in the direction of the largest dimension of their channel cross-sections and transition side by side into the same cooling fluid outlet slot, which is typically the case. The component according to the invention has several cooling fluid outlet slots with several associated cooling fluid supply channels. On both sides of the coolant supply channels' entry points into the wall, which lead to one of the coolant outlet slots, support elements project from the inner surface of the wall and are braced against a support wall located at a distance from the wall inside the component. This compensates for the weakening of the wall caused by the coolant supply channels and the subsequent coolant outlet slot. The more complex internal structure of the component required for this can be easily achieved through additive manufacturing. As already indicated, at least one main wall body of the wall of the component according to the invention is preferably manufactured additively, in particular by powder bed fusion, with a manufacturing direction extending along the slot width direction from the first boundary line to the second boundary line. The main wall body, or the main wall body provided with, for example, a ceramic coating, can form the wall with the cooling fluid outlet slot and the at least one cooling fluid supply channel. It is understood that the main wall body can be post-processed after additive manufacturing and / or after its optional coating to improve its surface quality by removing material, i.e., for example, by grinding. Advantageous further developments of the invention result from the patent claims, the description and the drawings. The advantages of features and combinations of features mentioned in the description are merely exemplary and can have an effect alternatively or cumulatively, without the advantages necessarily having to be achieved by embodiments according to the invention. Regarding the disclosure content—not the scope of protection—of the original application documents and the patent, the following applies: Further features can be derived from the drawings—in particular, the geometries depicted and the relative dimensions of several components to one another, as well as their relative arrangement and functional connection. The combination of features from different embodiments of the invention or from features of different claims is also possible, deviating from the chosen cross-references of the claims, and is hereby encouraged. This also applies to features that are illustrated in separate drawings or mentioned in their description. These features can also be combined with features from different claims.Likewise, features listed in the patent claims may be omitted for further embodiments of the invention, but this does not apply to the independent patent claims of the granted patent. The features mentioned in the claims and the description are to be understood, with regard to their number, as meaning that exactly that number or a greater number than the stated number is present, without the need for the explicit use of the adverb "at least". Thus, for example, if a cooling fluid outlet slot is mentioned, this is to be understood as meaning that exactly one cooling fluid outlet slot, two cooling fluid outlet slots, or more cooling fluid outlet slots are present. The features listed in the claims may be supplemented by further features or may be the only features that the subject matter of the respective claim possesses. The reference numerals contained in the patent claims do not constitute a limitation of the scope of the subject matter protected by the patent claims. They serve only the purpose of making the patent claims easier to understand. BRIEF DESCRIPTION OF THE FIGURES The invention will now be further explained and described with reference to the components shown in the figures, whereby only the component according to Fig. 6 falls within the scope of the patent claims. Fig. 1 shows a section of a wall of a component that does not fall within the scope of the patent claims, wherein here and in the following figures an outer surface of the wall is at the top and an inner surface of the wall is at the bottom, and wherein the concealed paths of a cooling fluid supply channel and a cooling fluid outlet slot, into which the cooling fluid supply channel transitions inside the wall, are shown with dashed lines. Fig. 2 is a top view of the inner surface of the section of the wall shown in Fig. 1, where three cooling fluid supply channels enter the wall, and shows the further paths of the cooling fluid supply channels and the subsequent cooling fluid outlet slot with dashed lines. Fig. 3 is a section through the component shown in Fig. 1 and Fig. 2.Figure 2 shows a section of the wall along the cooling fluid supply channels along a section line AA shown in Figure 1. Figure 4 is a section through the wall of a component other than that specified in the claims, along one of its cooling fluid supply channels. Figure 5 shows a channel cross-section of a fluid supply channel of a component not as specified in the claims. Figure 6 is a section corresponding to Figure 4 through the wall of a component according to the invention with an additional support wall extending inside the component; and Figure 7 is a section corresponding to Figure 4 through the wall of another component not as specified in the claims, wherein a curved cooling fluid supply channel and a subsequent curved cooling fluid outlet slot extend through the wall. FIGURE DESCRIPTION Fig. 1 shows a section of a wall 1 of a component 2 according to the invention for use in a high-temperature environment. The wall 1 has an outer surface 3 (shown here at the top) and an inner surface 4 (shown here at the bottom). A cooling fluid outlet slot 5 is formed in the wall 1, which opens through a slot opening 7 in the outer surface 3 at a slot angle 6 of approximately 40° to the outer surface 3 in the region of the slot opening 7. A cooling fluid supply channel 8 opens into the wall 1 at the inner surface 4 and transitions into the cooling fluid outlet slot 5 within the wall 1. Fig. 2 shows the inner surface 4 of the wall 1 and depicts a total of three cooling fluid supply channels 8, which merge into the same cooling fluid outlet slot 5 in the wall 1. The slot opening 7 of this slot is elongated in the outer surface 3 in a slot width direction 9. At the point where the cooling fluid supply channels 8 enter the wall 1 at the inner surface 4, the inlet length ratio of the largest dimension 10 to the smallest dimension 11 of the respective channel cross-section 12 is still relatively small, typically between 2:1 and 6:1. As the respective cooling fluid supply channel 8 extends through the wall 1, the length ratio increases until it reaches an outlet length ratio at the transition of the cooling fluid supply channel 8 into the cooling fluid outlet slot 5. This ratio is typically between 6:1 and 25:1, and preferably between 10:1 and 15:1. The length ratio of the slot opening 7 is considerably larger. Already from Fig.2 it is evident that the cooling fluid supply channels 8 do not run perpendicularly towards the cooling fluid outlet slot 5, but are inclined relative to the cooling fluid outlet slot 5. Fig. 3 shows that a first boundary line 13 and a second boundary line 14, at which the largest dimensions 10 of the respective channel cross-section 12 end along the slot width direction 9, run at a relatively acute opening angle 15 of approximately 15° to each other, and yet the second boundary line 14 runs at an acute angle 16 of approximately 45° to the slot width direction 9. This acute angle 16 is defined such that it opens towards the respective cooling fluid supply channel 8. This orientation of the second boundary line 14 relative to the slot width direction 9 proves to be particularly advantageous in the additive manufacturing of the component 2, especially when this is powder bed-based, and a manufacturing direction in the slot width direction 9 runs from the first boundary line 13 to the second boundary line 14. The section along one of the cooling fluid supply channels 8 through the wall 1 according to Fig. 4 shows essentially the same details as Fig. 1. However, in Fig. 4, the cooling fluid supply channel 8 and the subsequent slot 5 run more shallowly through the wall 1 than in Fig. 1, so that the slot angle 6 is smaller and, instead of approximately 40°, is approximately 30°. Furthermore, Fig. 4, which is on a larger scale than Fig. 1, clearly shows that the smallest dimension of the channel cross-sections of the cooling fluid supply channels 8 decreases from the inner surface 4 to the outer surface 3, so that the opening angle 15 of the boundary lines 13 and 14, and thus the increase in the largest dimension 10 of the channel cross-sections 12 of the cooling fluid supply channels 8, is at least substantially compensated. Fig. 5 shows a channel cross-section 12 of a cooling fluid supply channel 8 with its largest dimension 10 terminating at the boundary lines 13 and 14 and its smallest dimension 11 running transversely thereto. The channel cross-section 12 is bounded by two parallel straight segments 17 and 18, as well as a first semi-ellipse 19 and a second semi-ellipse 20. The first semi-ellipse 19 connects the two straight segments 17 and 18 across the first boundary line 13, while the second semi-ellipse 20 connects the two straight segments 17 and 18 across the second boundary line 14. The first semi-ellipse 13 has a smaller aspect ratio than the first semi-ellipse. Specifically, the axis ratio of the first semi-ellipse 13 is 1.2:1, while the axis ratio of the second semi-ellipse 20 is 2:1. The principal axes of both semi-ellipses 19 and 20 are aligned along the greatest extent 10.The channel cross-section 12 terminates in a pointed arc, particularly in the area of ​​the second boundary line 14. This pointed arc, along with the acute angle 16 to a manufacturing direction running along the slot width direction 9, is advantageous in the additive manufacturing of the component 2 to ensure that the coolant supply channel 8 has a dimensionally accurate cross-section 12 even in a component 2 additively manufactured in a powder bed. The line that limits the free cross-section 12 of the coolant supply channel 8 according to Fig. 5 is a modification of a race track shape and, like the latter, can be continued continuously along the course of the coolant supply channel 8. Fig. 6 is a cross-sectional view, essentially corresponding to Fig. 4, of a cooling fluid supply channel 8 through the wall 1 of component 2. Fig. 6 additionally shows a support wall 21 running parallel to the inner surface 4 of the wall 1 inside component 2. Support elements 22 projecting from the inner surface 4 of the wall are supported against the support wall 21, thus guaranteeing the mechanical integrity of the wall 1 in the area of ​​the cooling fluid supply channel 8 and the subsequent cooling fluid outlet slot 5. Although the support wall 21 is shown here as a continuous wall, it can have openings to supply cooling fluid to the cooling fluid supply channel 8. The design of the support wall 21 and the support elements 22 connecting it to the wall 1 can be easily implemented inside component 2 during additive manufacturing. Fig. 7 is another sectional view essentially corresponding to Fig. 4. The coolant supply channel 8 and the subsequent coolant outlet slot 5 run along a curved surface 23. The largest dimensions 10 of the channel cross-sections 12 of the coolant supply channel 8, which are not visible here, run within the curved surface 23. The curvature of the surface 23 is such that its angle to the outer surface 3 decreases from the inner surface 3 to the outer surface 4 in the region of the slot opening 7, until it reaches the slot angle 6 at the slot opening 7. This slot angle 6 is significantly smaller here, at approximately 25°, than in Fig. 4. As a result, the coolant exiting through the coolant outlet slot 5 adheres particularly well to the surface 3 downstream of the slot opening 7. In another embodiment of the component according to the invention, the boundary lines 13 and 14 do not run in a straight line, but their opening angle 15 increases slightly in a trumpet-like shape from the inside 4 to the outside 3 of the wall 1. For the production of the component according to the invention, a main wall body can first be additively manufactured, which is then provided with a high-temperature resistant coating, for example on a ceramic basis, which can extend into the cooling fluid outlet slot 5 and the cooling fluid supply channels 8. Relative dimensions of the cooling fluid supply channels have already been specified in the description of the invention and these apply to the embodiments shown in the figures. REFERENCE MARK LIST 1 Wall 2 Component 3 Outer surface 4 Inner surface 5 Cooling fluid outlet slot 6 Slot angle 7 Slot opening 8 Cooling fluid supply channel 9 Slot width direction 10 Largest dimension 11 Smallest dimension 12 Channel cross-section 13 First boundary line 14 Second boundary line 15 Opening angle 16 Acute angle 17 Straight section 18 Straight section 19 First semi-ellipse 20 Second semi-ellipse 21 Support wall 22 Support element 23 Surface

Claims

Component (2) for use in a high-temperature environment, comprising: - a wall (1) having an outer surface (3) and an inner surface (4); - a cooling fluid outlet slot (5) in the wall (1), which opens at a slot angle (6) in a slot angle range of 10° to 90° to the outer surface (3) through a slot opening (7) in the outer surface (3) elongated in a slot width direction (9); and - at least one cooling fluid supply channel (8) opening into the wall (1) at the inner surface (4), which transitions into the cooling fluid outlet slot (5) in the wall (1); - wherein channel cross-sections (12) of the at least one cooling fluid supply channel (8) have their largest dimensions (10) along the slot width direction (9), the largest dimensions (10) increasing from the inner surface (4) to the outer surface (3) and extending at a first boundary line (13) and a second boundary line (14) end,which extend towards each other at an opening angle in an opening angle range of 10° to 30°, wherein the second boundary line (14) at the transition of the cooling fluid supply channel (8) into the cooling fluid outlet slot (5) extends parallel to the slot width direction (9) at an acute angle (16) in an angle range of 30° to 60°, the acute angle (16) opening towards the at least one cooling fluid supply channel (8), and wherein several cooling fluid supply channels (8) are arranged side by side in the direction of the greatest extensions of their channel cross-sections (12), characterized in that the several cooling fluid supply channels (8), which are arranged side by side in the direction of the greatest extensions of their channel cross-sections (12), transition into the cooling fluid outlet slot (5), wherein, next to the inlets of the cooling fluid supply channels (8) into the wall (1), support elements (22) are formed from the inner surface (4) of the wall (1). stand outwherein the support elements (22) are supported on a retaining wall (21) which runs at a distance from the wall (1) inside the component (2). Component (2) according to claim 1, wherein a surface (23) in which the largest dimensions (10) of the channel cross-sections (12) of the at least one cooling fluid supply channel (8) run has such a curvature that its surface angle to the outer surface (3) at the slot opening (7) decreases from the inner surface (4) to the outer surface (3) until it reaches the slot angle (6) at the slot opening (7). Component (2) according to one of the preceding claims, wherein the channel cross-sections (12) are each bounded by two parallel straight segments (17, 18), a first semi-ellipse (19) connecting the straight segments (17, 18) across the first boundary line (13) and a second semi-ellipse (20) connecting the straight segments (17, 18) across the second boundary line (14). Component (2) according to claim 3, wherein the principal axes of the semi-ellipses (19, 20) are each aligned along the greatest extent (10). Component (2) according to claim 4, wherein a first axis ratio of the first semi-ellipse (19) and a second axis ratio of the second semi-ellipse (20) are in an axis ratio range between 1.1:1 and 3:

1. Component (2) according to claim 5, wherein the first axis ratio is in an axis ratio range between 1.2:1 and 2.5:

1. Component (2) according to claim 4, wherein a first axis ratio of the first semi-ellipse (19) is at least 0.2 smaller than a second axis ratio of the second semi-ellipse (20), wherein the second axis ratio is in an axis ratio range between 1.2:1 and 3:

1. Component (2) according to one of the preceding claims, wherein the area ratio of the channel cross-section (12) at the transition of the at least one cooling fluid supply channel (8) into the cooling fluid outlet slot (5) to the channel cross-section (12) at the entry of the at least one cooling fluid supply channel (8) through the inner surface (4) is in an area ratio range between 0.8:1 and 5:

1. Component (2) according to one of the preceding claims, wherein an inlet length ratio of the largest dimension (10) to a smallest dimension (11) of the channel cross-section (12) at the entry of the at least one cooling fluid supply channel (8) through the inner surface (4) of the wall (1) is in an inlet length ratio range between 2:1 and 6:1 and wherein an outlet length ratio of the largest dimension (10) to the smallest dimension (11) of the channel cross-section (12) at the transition of the at least one cooling fluid supply channel (8) into the cooling fluid outlet slot (5) in the wall (1) is in an outlet length ratio range between 6:1 and 25:

1. Component (2) according to claim 9, wherein the initial length ratio is in an initial length ratio range between 10:1 and 15:

1. Component (2) according to one of the preceding claims, wherein a main wall body of the wall (1) is additively manufactured with a manufacturing direction extending along the slot width direction (9) from the first boundary line (13) to the second boundary line (14), wherein the main wall body or the main wall body provided with a coating forms the wall (1) with the cooling fluid outlet slot (5) and the at least one cooling fluid supply channel (8).

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