Component of a brake for a vehicle and method for its manufacture

Description

[0001] The invention relates to a component of a brake for a vehicle, comprising a metallic base body having a surface which, in order to increase its wear resistance, is provided with a coating which comprises an intermediate layer lying on the base body and a cover layer lying on the intermediate layer, which cover layer is formed from a stainless steel matrix with hard material particles embedded therein.

[0002] The invention also relates to a method for producing a component for a brake for a vehicle, in which an intermediate layer is produced on a surface of a base body of the component and in which a cover layer is subsequently produced on the intermediate layer by a further laser deposition welding method in which a laser beam is moved over a stainless steel powder applied to the free surface of the intermediate layer, said cover layer being formed from a stainless steel matrix with hard material particles embedded therein.

[0003] A component of this type, designed as an internally ventilated brake disc, is known from DE 10 2008 053 ​​637 B4. The friction surface formed on the friction ring of the brake disc, which is subjected to a brake pad pressing against it during braking, is coated with a two-layer coating. An intermediate layer is applied directly to the friction surface of the base body of the brake disc and serves to bond the outer cover layer of the coating lying thereon and to thermally dissipate the heat energy introduced into the outer layer during braking. The intermediate layer consists of a zinc- and / or nickel-based alloy, while the cover layer is a carbide layer or a metal matrix composite layer.The thickness of the coating is adapted to the geometric conditions of the internally ventilated disc in that the thickness of the coating above the cooling channels of the brake disc is greater than above the knobs or webs that separate the cooling channels from one another.

[0004] DE 10 2005 008 569 A1 also describes a brake disc to whose friction surface a coating consisting of two layers has been applied. The layers are produced from coating powders. The coating powders are composed in such a way that they form a nickel- or nickel-cobalt-based matrix into which hard material particles, such as WC or TiO2, are embedded to adjust the required hardness. The respective coating powder is applied to the surfaces of the brake disc to be coated by high-velocity flame spraying, with a thin intermediate layer being sprayed on first, followed by a thicker top layer. This is followed by a heat treatment in which the previously sprayed layers are melted to ensure their integral bond to the base body of the brake disc, which is made of gray cast iron.The toughness and hardness of the layers are matched to each other in such a way that the intermediate layer ensures the bonding of the top layer.

[0005] From US 5,407,035 A it is furthermore known to form a coating on a friction surface of a brake disc in at least two layers in such a way that a connection of the cover layer lying on it is achieved via an intermediate layer lying on the base body of the brake disc, wherein the thickness of the intermediate layer is significantly smaller than the thickness of the cover layer.

[0006] A component and a method of the type specified at the outset are known from WO 2020 / 043712 A1. The component known from this publication comprises a metallic base body having a surface provided with a coating to increase its wear resistance, said coating comprising an intermediate layer resting on the base body and a cover layer resting on the intermediate layer, wherein the intermediate layer has a higher toughness than the cover layer, which in turn has a higher hardness than the intermediate layer. To simplify the manufacture of such a component and increase its wear resistance, the intermediate layer consists of a Ni or Cr alloy with a Ni or Cr content of more than 50 wt.% each and, optionally, hard material particles embedded in the intermediate layer to improve wear resistance.The cover layer, on the other hand, is formed from a stainless steel matrix with hard material particles embedded therein, whereby the thermal conductivity of the base body is 1.5 to 3 times greater than the thermal conductivity of the intermediate layer, the thermal conductivity of the cover layer is 2 to 4.5 times greater than the thermal conductivity of the base body and whereby the thickness ratio formed from the thickness Dz of the intermediate layer and the thickness Dd of the cover layer is Vd = Dd / Dz, Vd ≥ 1.5.

[0007] For the application of the top layer, WO 2020 / 043712 A1 provides a high-speed laser cladding process, as described in DE 10 2011 100 456 B4. In this process, a molten pool containing at least one molten filler material is created on a surface to be coated by means of a laser beam irradiated onto the molten pool. Powder of the filler material is melted by the laser beam, wherein the filler material is melted by the laser beam at a distance from the molten pool and is fed into the molten pool in completely molten form. The molten pool and a focus of the laser beam are displaced parallel to each other relative to the surface to be coated at a speed of at least 20 m / min, and the powder density is adjusted such that the laser beam power in the molten pool is less than 60% of the laser power before contact between the laser beam and the powder.The use of such processes can achieve a particularly intensive bond between the intermediate layer and the base body and the cover layer, thus significantly minimizing the risk of delamination of the cover layer from the intermediate layer or of the coating as a whole from the base body. The key advantage of the process known from DE 10 2011 100 456 B4 is that the filler material is added to the molten pool in the same aggregate state as the molten pool on the surface of the component. This eliminates the time required for melting the powder particles in the molten pool. This, in turn, is intended to reduce the time required for layer formation, thereby significantly increasing the process speed.

[0008] DE 10 2006 035 948 A1 relates to a brake disc having a base body coated with a wear-resistant material.

[0009] DE 10 2006 060 775 A1 discloses a wedge brake comprising a brake disc and a wedge that can be displaced in the longitudinal direction by means of an actuator.

[0010] US 2018 / 0180125 A1 discloses a braking system comprising a part (e.g. a brake disc) with a surface comprising a metal coating applied by means of a cold spray laser coating.

[0011] DE 10 2019 212 844 A1 relates to a brake disc for a wheel brake of a land vehicle, comprising a base body formed from grey cast iron with at least one axial friction side, at least one corrosion protection layer applied to the axial friction side and at least one wear protection layer applied to the corrosion protection layer.

[0012] Against the background of the state of the art, the task arose to create a brake component of the type mentioned at the outset and explained in detail above, which has further optimized usage properties compared to the state of the art.

[0013] In addition, a process should be specified that enables the reliable production of such a component.

[0014] The invention has solved this problem by a component having at least the features specified in claim 1.

[0015] The method according to the invention for producing such a component is mentioned in claim 5.

[0016] Advantageous embodiments of the invention are specified in the dependent claims and are explained in detail below, as is the general inventive concept.

[0017] Accordingly, a component according to the invention of a brake for a vehicle comprises a metallic base body having a surface which, in order to increase its wear resistance, is provided with a coating which comprises an intermediate layer lying on the base body and a cover layer lying on the intermediate layer, which cover layer is formed from a stainless steel matrix with hard material particles embedded therein.

[0018] According to the invention, the hard material particles embedded in the stainless steel matrix of the cover layer have an average grain diameter of 10 µm to 125 µm, wherein the hard material particles have a non-melted core region consisting of unaffected material of the hard material particles, which is surrounded at least in sections by a mixing zone formed from material of the stainless steel matrix and material of the respective hard material particle, via which the hard material particles are each bonded to the stainless steel matrix in a material-locking manner.

[0019] In a method according to the invention for producing a component for a brake for a vehicle, an intermediate layer is created on a surface of a base body of the component in a corresponding manner in a first step. In a second step, a cover layer is created on the intermediate layer by means of a laser deposition welding process in which a laser beam is moved over a stainless steel powder applied to the free surface of the intermediate layer. This cover layer is formed from a stainless steel matrix with hard material particles embedded therein. During the creation of the cover layer, the laser beam is directed onto the stainless steel powder applied to the intermediate layer at a laser intensity of 0.1 - 2.5 kW / mm².At the same time, the laser beam is adjusted so that the spot where the laser beam hits the applied stainless steel powder and where the stainless steel powder is melted into a molten bath has a diameter of 2.5 - 15 mm. Finally, according to the invention, hard material particles with an average grain diameter of 15 µm to 135 µm, preferably 15 µm to 125 µm, are added to the resulting molten bath.

[0020] The invention is based on the finding that the hard material particles in the stainless steel matrix of the cover layer have a core region that is bonded to the stainless steel matrix via the surrounding mixing zone, ensuring optimal retention of the hard material particles in the stainless steel matrix. At the same time, the hard material particles present in the stainless steel matrix according to the invention optimally support the hardness of the cover layer, since their core region retains their original hardness, which existed before their introduction into the cover layer. A cover layer in which hard material particles are firmly anchored in the manner according to the invention therefore makes an optimal contribution to the wear resistance and effectiveness of a brake component coated with a coating system according to the invention.

[0021] In a cover layer according to the invention, an intermediate layer is thus present between the hard material particles and the material of the surrounding stainless steel matrix, the composition of which differs from that of both the hard material particles and the stainless steel matrix. This mixed layer, consisting of mixed material from the stainless steel matrix and the hard material particles, typically completely enclosing the core of the hard material particles, forms when the hard material particles are partially melted during the laser beam treatment used to create the cover layer, so that the molten material of the stainless steel matrix and the molten material of the respective hard material particles flow into each other to form the mixed layer.By embedding only sufficiently large grains into the stainless steel matrix of the cover layer according to the invention on the one hand and by limiting the laser energy density required for embedding the hard material particles in the stainless steel matrix in the method according to the invention in accordance with the provisions of the invention on the other hand, the formation of the mixed layer is supported and at the same time a complete melting of the hard material particles is reliably avoided.

[0022] As a result, the fact that according to the invention the hard material particles embedded in the cover layer are not completely melted but remain in their core area leads to maximized stability and thus maximized effectiveness of the coating formed according to the invention.

[0023] The parameters of the laser cladding process used to produce the cover layer are accordingly selected according to the invention such that the local heat input via the laser beam into the stainless steel powder applied to the intermediate layer to form the cover layer is sufficient to melt the powder in the area of ​​the laser spot, i.e. the impact area of ​​the laser beam, but at the same time is limited such that the melting of the hard material particles that are introduced into the melt pool formed in the laser spot remains limited to the peripheral area of ​​the hard material particles.In this way, an intensive material bonding of the hard material particles is created via the mixing zone formed by the molten peripheral area of ​​the hard material particles and the adjacent molten stainless steel matrix, while the core area of ​​the hard material particles remains in the state in which the hard material particles are introduced into the melt bath.

[0024] At the same time, the laser intensity and the diameter of the spots where the laser hits the stainless steel powder are coordinated so that the melt forming in it remains molten for as long as possible, despite the addition of hard material particles. As a result, the hard material particles introduced into the melt pool have sufficient time to distribute evenly throughout the melt pool before the melt solidifies.

[0025] As a result, a component coated according to the invention is characterized by the fact that the hard material particles in the top layer are homogeneously and evenly distributed. This, in turn, contributes to the uniform distribution of the high wear resistance of a component according to the invention across the surface covered by the top layer.

[0026] Optimized manufacturing results can be achieved with the method according to the invention if the laser intensity of the laser beam used to produce the cover layer is a maximum of 1.2 KW / mm 2<.

[0027] The laser intensities specified according to the invention can be achieved taking into account the size of the spot in which the laser falls on the stainless steel powder forming the matrix of the cover layer by the laser power of the laser beam used for producing the cover layer being 6 - 25 KW.

[0028] Another control variable that can influence the laser intensity and thus the local heat input in the spot area where the laser beam impinges on the powder forming the stainless steel matrix is ​​the spot diameter. According to the invention, this is 2.5–15 mm. Diameters of at least 8 mm have proven particularly suitable in practical testing, and optimized processing results have been achieved with spot diameters of up to 12.5 mm.

[0029] The thickness of the top layer applied according to the invention after grinding is typically 50–200 µm, in particular 50–150 µm, with top layer thicknesses of 80–140 µm having proven particularly favorable in practical tests. In the unground state, however, the thickness of the top layer is typically 50–300 µm.

[0030] The intermediate layer provided according to the invention can, in principle, be applied to the respective surface of the component to be coated using any thermal deposition process, such as deposition welding, spray welding, or plasma welding. The techniques required for this are generally known from the prior art. For example, the high-speed laser deposition welding process mentioned above and described in DE 10 2011 100 456 B4 is suitable for this purpose.

[0031] The intermediate layer can be made of a steel already used for this purpose in the state of the art, in particular a known stainless steel material that possesses sufficient toughness. An example of such a stainless steel material is steel 316L, which is standardized according to the US AISI / ASTM standards.

[0032] The intermediate layer provided in the coating according to the invention fulfills several functions. On the one hand, it serves to compensate for unevenness and depressions, such as pores or breakouts, present on the surface of the component covered with the coating. On the other hand, the intermediate layer absorbs and compensates for temperature-induced stresses.

[0033] In order to meet these requirements, the intermediate layer can have a thickness of 50 - 200 µm, in particular 50 - 150 µm, whereby intermediate layer thicknesses of 80 - 140 µm have proven to be particularly favorable in practical tests.

[0034] According to the invention, the matrix of the cover layer is formed by a stainless steel. These stainless steels include, in particular, austenitic stainless steels. Suitable stainless steels are, for example, those standardized under the material number 1.4404 or according to the US AISI / ASTM standards in the number series 316 - 431L. Steels with reduced or ineffective Ni content are particularly preferred.

[0035] The hard material particles embedded in the matrix of the cover layer ensure the required hardness and the associated wear resistance of the cover layer. Suitable hard material particles for this purpose are, in particular, metallic, covalent, or ionic carbides. The hard materials present in the cover layer and optionally in the intermediate layer according to the invention include, in particular, tungsten carbides, chromium carbides, titanium carbides, vanadium carbides, or silicon carbides. An optimal ratio of matrix material to hard material particles with regard to the performance properties of the cover layer is achieved when the volume fraction of the hard material particles embedded in the steel matrix of the cover layer is 20–70 vol.% of the total volume of the cover layer. Even higher hard material contents would impair the strength and heat transfer values ​​of the cover layer. At lower hard material contents, the required hardness would not be achieved.

[0036] The hard material particles embedded in the stainless steel matrix of the cover layer according to the invention develop their effect when they are introduced into the cover layer with an average grain size of 15 - 135 µm. When embedded in the cover layer, the unchanged, unmelted core regions of the hard material particles still have a diameter of 15 - 125 µm. Practical tests have shown that it is particularly effective for the hard material particles introduced into the stainless steel matrix of the cover layer to have an average grain diameter of 105 µm at most. According to the invention, hard material particles with a broad grain size spectrum can therefore be processed. This enables particularly cost-effective production of the cover layer according to the invention. For more demanding requirements, the grain sizes of the hard material particles can be more precisely selected.It may be expedient to incorporate hard material particles with an average grain diameter of at least 20 µm, in particular at least 35 µm or at least 45 µm, into the cover layer. Accordingly, the average grain diameters of the hard material particles incorporated into the cover layer according to the invention are preferably 20-105 µm, in particular 35-105 µm or 45-105 µm or 20-60 µm, with particularly good results being expected with hard material particles with an average grain size of 35-60 µm, in particular 45-60 µm. Hard material particle fractions of 20 - 60 µm, especially 35 - 60 µm or 45 - 60 µm, are particularly suitable for applications where the laser spot has a smaller diameter of up to 8 mm, while grain sizes of 35 - 105 µm, especially 45 - 105 µm, are suitable for processing with a spot diameter ≥ 8 mm.

[0037] The hardness of the top layer of a coating according to the invention, determined according to DIN EN ISO 6507-1, is 700 HV10 to 1250 HV10 due to the inventive embedding of the hard material particles. Typically, the top layer of a coating according to the invention has a hardness of 850 - 1050 HV10.

[0038] Due to the homogeneous distribution of the hard material particles embedded in the cover layer achieved by the invention, a component according to the invention is characterized in that the difference between the smallest value Hmin of the surface hardness determined on the free surface of the cover layer and the largest value Hmax of the surface hardness determined on the free surface of the cover layer is at most 250 HV10, in particular 100 HV10 (ie [Hmax - Hmin] ≤ 100 HV10).

[0039] The invention is particularly effective when the component coated according to the invention is a friction ring of a brake disc, and the surface covered with the coating is a friction surface present on the friction ring against which an actuating device with a brake pad acts during a braking operation. The friction ring can be a separately manufactured component of the brake disc that is connected to the respective supporting part of the brake disc in a special assembly step, as is the case with so-called "assembled brake discs" or with brake discs in which the supporting part is cast onto the friction ring in a separate work step, or the friction ring is cast onto the supporting part in a separate work step. Likewise, the friction ring can of course be part of a brake disc manufactured in one piece, in particular by casting, in which the supporting part and friction ring are connected to one another as a single piece.

[0040] If it turns out that the free surface of the top layer of a coating applied according to the invention is excessively rough or uneven, the surface in question can be given sufficient flatness and roughness by grinding. If the surface coated according to the invention is the friction surface of a brake disc, the target value is a mean roughness Ra determined according to DIN EN ISO 4288 of 1 - 3.2 µm, in particular 1.4 - 1.7 µm, and a flatness deviation of no more than 20 µm.

[0041] The material from which the base body of the component according to the invention is made is typically a metallic cast material, which allows the base body to be produced by casting. This includes, in particular, iron or aluminum cast materials, whose thermal conductivity particularly meets the requirements of the invention and which are particularly suitable for the production of friction rings.

[0042] To maintain the melt pool formed in the laser spot from the stainless steel powder of the stainless steel matrix for as long as possible, it may be advisable to preheat the component to a temperature of 100–700 °C before the laser beam hits it. This delays the heat flow from the melt pool into the base body of the component, thus slowing the solidification of the matrix material of the cover layer.

[0043] For preheating, the component can be heated as a whole in a suitable furnace. For larger components or components where only certain surface sections are to be coated, preheating can also be limited to the surface sections to be coated. Adjacent surface sections can be heated successively, one after the other, ahead of the coating. Induction heating is particularly suitable for this. It has proven particularly practical here if locally limited induction heating occurs ahead of the laser spot, i.e. if the component is successively heated locally in advance of the laser beam, in the section in which the stainless steel powder is subsequently melted by the laser beam.

[0044] Preheating temperatures of 250–350 °C have proven particularly effective for the purposes of the invention. Preheating also contributes to reducing stresses between the top layer and the intermediate layer, as well as between the intermediate layer and the base body.

[0045] The invention is explained in more detail below using an exemplary embodiment(s). They show: Fig. 1: a brake disc for a motor vehicle in a section along its rotational axis XX; Fig. 2 - 4: cross-sections of a coating produced on the brake disc, oriented transversely to the circumferential direction of the brake disc.

[0046] The brake disc 1, which represents a component within the meaning of the invention, has a base body 2 which is designed in a conventional manner and is cast from a cast iron material known for this purpose and has the DIN-EN designation EN-JL1040.

[0047] The brake disc 1 has a cup-shaped support part 3 and a friction ring 4 cast thereon, which is shown here as being made of solid material, but can also be designed in a conventional manner as an internally ventilated friction ring 4.

[0048] The friction ring 4 has, in the same way as usual, an annular friction surface 5a, 5b on each of its end faces aligned normal to the axis of rotation XX.

[0049] In the case of the base body 2 provided for the coating, friction surfaces 5a, 5b have been prepared after casting of the base body 2 by machining in a manner known per se so that they have an average roughness depth Rz of 20 µm on their upper side.

[0050] A coating B consisting of an intermediate layer Z and a cover layer D is applied to the friction surfaces 5a, 5b of the base body 2 thus machined.

[0051] The intermediate layer Z was made from a commercially available powdered stainless steel material, such as the above-mentioned stainless steel material standardized under the designation 316L. The thickness Dz of the intermediate layer Z was 120 - 140 µm.

[0052] To apply the intermediate layer Z, the brake disc was positioned horizontally in a clamping device (not shown here), which was driven to rotate about the rotation axis XX of the brake disc 1 by means of a rotary drive (also not shown here). The intermediate layer Z was then created by laser deposition. For this purpose, a laser beam device (not shown here) (laser head diameter = 5 mm) was positioned in a starting position on the inner diameter of the friction ring 4 and the brake disc 1 was rotated at 60 revolutions per minute. Starting from the starting position, the laser was then moved radially towards the outer circumference of the friction ring at a speed of 10 m / min. The laser was ignited during start-up and switched off when the outer diameter was reached.At the start of the laser irradiation, the powdered steel material of the intermediate layer Z was applied to the area covered by the laser beam in accordance with the procedure described in DE 10 2011 100 456 B4.

[0053] The intermediate layer Z compensated for any unevenness present on the friction surfaces 5a, 5b and closed pores 6, so that after the application of the intermediate layer Z, a flat surface was present on the side facing away from the base body 2, which was optimally suited for the application of a covering layer D.

[0054] In three tests, a covering layer D was applied as follows to three brake discs 1, each coated with the intermediate layer Z in the manner described above: Hard material particles HP were provided, which were tungsten carbide particles.

[0055] The HP hard material particles had an average grain diameter of - 25 - 60 µm.

[0056] A layer of powder consisting of a stainless steel standardized under the material number 1.4404 in accordance with the StahlEisen list was applied to the brake disc 1, which was clamped in a rotationally driven manner as for the application of the intermediate layer Z.

[0057] A laser beam was directed onto the powder, which hit the section of the powder layer below it in a spot with a diameter of 2.9 mm in tests 1 and 2 and in test 3 in a spot with a diameter of 1.2 mm.

[0058] In test 1, the laser intensity was 0.2 KW / mm 2< , in test 2 the laser had an intensity of 2.20 KW / mm 2< and in test 3, which is not according to the invention, the laser intensity was 3.50 KW / mm 2< .

[0059] By rotating the brake disc 1 about the rotation axis XX, the powder layer is moved under the laser beam and thus the laser spot is moved successively over the powder layer until, after a corresponding number of revolutions, the stainless steel powder is completely melted and solidified again to form the stainless steel matrix E of the cover layer D.

[0060] A quantity of the provided HP hard material particles was introduced into the melt pool formed from the stainless steel powder in the spot of the laser beam, which was such that the melt pool contained a steel melt that consisted of 40% HP hard material particles and the remainder of the stainless steel melt.

[0061] The resulting top layer D had a thickness Dd of 250 µm and a surface hardness of 950 - 1500 HV10.

[0062] On the brake discs 1 coated in this way, grindings have been produced that are aligned transversely to the circumferential direction and that areFigures 2 (Experiment 1), 3 (Experiment 2) and 4 (Experiment 3).

[0063] This can be seen in the Figures 2 - 4 the cast iron material G of the brake disc 1, the intermediate layer Z lying on the cast iron material G and the cover layer D lying on the intermediate layer Z with the hard material particles HP embedded therein.

[0064] The hard material particles HP each have a clearly recognizable inner core region K, which is not melted and is therefore in the state in which the hard material particles HP were introduced into the melt pool created from the stainless steel powder by the laser beam during the production of the cover layer D.

[0065] The core area K of the hard material particles HP is surrounded by a mixing zone M in which the material of the hard material particle HP is mixed with the stainless steel material of the stainless steel matrix E of the cover layer D. The hard material particles HP with their core area K are firmly bonded to the stainless steel matrix E via the mixing zone M.

[0066] It is shown that in the tests carried out according to the invention, ie with a laser intensity for which 0.1 ≤ laser intensity ≤ 2.5, the core areas K of the hard material particles HP in the stainless steel matrix E were present in a clearly defined form.

[0067] In contrast, in test 3, which is not inventive due to the excessive laser intensity, the hard material particles HP are melted and heavily deformed, so that neither their shape nor their properties correspond to the original state in which they were provided. Rather, the Fig. 4The areas visible as dark dots consist only of mixing zones in which the completely melted material of the hard phases is mixed with the stainless steel material of the stainless steel matrix E. REFERENCE SYMBOL

[0068] 1Brake disc 2Brake disc base body 1 3Brake disc support 1 4Friction ring of brake disc 1 5a,5bFriction surface of friction ring 4 6Pores BBocation DTop layer of coating B DdThickness of top layer D DzThickness of intermediate layer Z EEstainless steel matrix of the top layer D GEt iron material of the brake disc 1 HPHard material particles KKore area of ​​the hard material particles XAxis of rotation of the brake disc 1 ZIntermediate layer of coating B MMmixed layer surrounding the hard material particles HP

Claims

1. Component of a brake for a vehicle, having a metallic base body which has a surface (5a, 5b) which, in order to increase its wear resistance, is provided with a coating (B) which comprises an intermediate layer (Z) lying on the base body (2) and a covering layer (D) lying on the intermediate layer (Z), which covering layer (D) is formed from a stainless steel matrix (E) with hard material particles (HP) embedded therein, characterized in that the hard material particles (HP) embedded in the stainless steel matrix (E) of the covering layer (D) have an average grain diameter of 10 µm to 125 µm and in that the hard material particles (HP) have a non-melted core region (K) consisting of uninfluenced material of the hard material particles (HP), which core region (K) is surrounded at least in sections by a mixing zone (M) formed from material of the stainless steel matrix (E) and material of the respective hard material particle (HP), via which mixing zone (M) the hard material particles (HP) are in each case materially bonded to the stainless steel matrix (E).

2. Component according to claim 1, characterized in that the stainless steel matrix (E) of the covering layer (D) consists of a stainless steel with the material number 1.4404 or one of the stainless steels which are standardized in the US American standards AISI / ASTM under the numbers 316 - 431L.

3. Component according to one of the preceding claims, characterized in that the surface hardness of the covering layer (D) is 850 - 1050 HV10.

4. Component according to claim 3, characterized in that the difference between the smallest value Hmin of the surface hardness determined at the free surface of the covering layer (D) and the largest value Hmax of the surface hardness determined at the free surface of the covering layer (D) is at most 100 HV10.

5. Method for manufacturing a component for a brake for a vehicle, in which, in a first step, an intermediate layer (Z) is produced on a surface of a base body (2) of the component (1) and in which, in a second step, by a method of laser deposition welding, in which a laser beam is moved over a stainless steel powder applied to the free surface of the intermediate layer (Z), a covering layer (D) is produced on the intermediate layer (Z), which covering layer (D) is formed from a stainless steel matrix (E) with hard material particles (HP) embedded therein, characterized in that during the producing of the covering layer (D), the laser beam is directed at the stainless steel powder applied to the intermediate layer (Z) with a laser intensity that is 0,1 - 2,5 KW / mm2, in that the spot, in which the laser beam impinges on the applied stainless steel powder and in which the stainless steel powder is melted to form a melt bath, has a diameter of 2,5 - 15 mm, and in that hard material particles (HP) whose average grain diameter is 15 µm to 135 µm are added into the melt bath thus formed.

6. Method according to claim 5, characterized in that the hard material particles (HP) embedded in the stainless steel matrix (E) of the covering layer (D) have an average grain diameter of at most 105 µm, preferably at most 60 µm.

7. Method according to claim 5 or claim 6, characterized in that the hard material particles (HP) embedded in the stainless steel matrix (E) of the covering layer (D) have an average grain diameter of at least 20 µm.

8. Method according to claim 7, characterized in that the hard material particles (HP) embedded in the stainless steel matrix (E) of the covering layer (D) have an average grain diameter of at least 45 µm.

9. Method according to one of the claims 5 to 8, characterized in that the laser intensity of the laser beam used for producing of the covering layer (D) is at most 1,2 KW / mm2.

10. Method according to claim 5 to 9, characterized in that the laser power of the laser beam used for producing of the covering layer (D) is 6 - 25 KW.

11. Method according to one of the claims 5 to 10, characterized in that the component is preheated to a preheating temperature of 100 - 700 °C prior to impingement of the laser beam.

12. Method according to claim 11, characterized in that the component as a whole is preheated to the preheating temperature prior to the application of the stainless steel powder.

13. Method according to claim 11, characterized in that the component is preheated to the preheating temperature in a locally restricted manner in the section in which the stainless steel powder is subsequently melted by the laser beam.

14. Method according to claim 13, characterized in that the component is preheated in a manner leading the laser beam.

15. Method according to one of the claims 11 to 14, characterized in that the preheating is carried out by means of inductive heating.