Friction brake body for a friction brake of a motor vehicle, method for producing a friction brake

Patent metadata

Field	Value
Publication number	US-12169009-B2
Application number	US-202017611677-A
Country	US
Kind code	B2
Filing date	May 15, 2020
Priority date	May 18, 2019
Publication date	Dec 17, 2024
Grant date	Dec 17, 2024

Abstract

The disclosure relates to a friction brake body for a friction brake of a motor vehicle, in particular a brake disc, wherein the friction brake body comprises a base body made from gray cast iron, and at least one wear resistant layer formed at least in areas on the base body. The wear resistant layer is a laser alloyed or laser dispersed edge layer of the base body and comprises at least one additive.

First claim

The invention claimed is:

1. A process for producing a friction brake element for a friction brake of a motor vehicle, comprising:
making a main element of the friction brake element from gray cast iron; and
providing the main element, at least in regions, with at least one antiwear layer, wherein the at least one antiwear layer is produced by one of laser alloying and laser dispersion of at least one additive with or in a surface layer of the main element,

wherein
chromium or ferrochromium and at least one further carbide-forming element selected from a group consisting of titanium, niobium, vanadium, tungsten, and molybdenum, are used as the at least one additive;
the surface layer of the main element is melted to form a melt and the melt is subsequently provided with the at least one additive during the laser alloying or laser dispersion; and
more chromium is added to the melt than an amount of free carbon available for formation of chromium carbide in the melt in order to ensure a corrosion resistance of the at least one antiwear layer.

2. The process as claimed in claim 1 , wherein the at least one additive is introduced in powder form into the melt.

3. The process as claimed in claim 1 , wherein carbides selected from a group consisting of chromium carbide, niobium carbide, titanium carbide, tungsten carbide, molybdenum carbide, and vanadium carbide, are used as additive.

4. The process as claimed in claim 1 , wherein a martensitic basic microstructure is produced in the at least one antiwear layer after the laser alloying or laser dispersion.

5. The process as claimed in claim 1 , further comprising:
cooling the surface layer after the laser alloying or laser dispersion; and
carrying out at least one of a laser hardening, an induction hardening, and a flame hardening after cooling.

6. The process as claimed in claim 1 , further comprising;
cooling the surface layer after the laser alloying or laser dispersion; and
heat treating at least the surface layer at least once after cooling.

7. A process for producing a friction brake element for a friction brake of a motor vehicle, comprising:
making a main element of the friction brake element from gray cast iron;
providing the main element, at least in regions, with at least one antiwear layer, wherein the at least one antiwear layer is produced by one of laser alloying and laser dispersion of at least one additive with or in a surface layer of the main element;
cooling the surface layer after the laser alloying or laser dispersion; and
carrying out at least one of a laser hardening, an induction hardening, and a flame hardening after cooling.

8. A process for producing a friction brake element for a friction brake of a motor vehicle, comprising:
making a main element of the friction brake element from gray cast iron;
providing the main element, at least in regions, with at least one antiwear layer, wherein the at least one antiwear layer is produced by one of laser alloying and laser dispersion of at least one additive with or in a surface layer of the main element;
cooling the surface layer after the laser alloying or laser dispersion; and
heat treating at least the surface layer at least once after cooling.

Assignees

• Bosch Gmbh Robert
• Buderus Guss Gmb

Inventors

• Potapenko Ilja
• Schnatterer Christian
• Kiedrowski Thomas
• Wu Kangjian
• Loskyll Simon
• Hellfeier Sebastian

Classifications

• F16D2250/0046

  Coating · CPC title

• F16D2200/0078

  laminated · CPC title

• F16D2200/0047

  Ceramic composite, e.g. C/C composite infiltrated with Si or B, or ceramic matrix infiltrated with metal · CPC title

• F16D2200/0013

  Cast iron · CPC title

• F16D2065/1344

  permanent, e.g. by casting · CPC title