Superferritic Iron-Based Brake Disk Coating
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Solution Overview
Problem
Existing thermal coating methods for brake disks are complex and costly, often optimizing only specific properties while compromising others, and require additional gas treatment processes, making them inefficient and expensive.
Innovation Solution
A superferritic iron-based spray powder with a specific chemical composition, including C, Mn, Cr, Mo, Ni, Nb, P, S, Si, Al, O, and Zr, is used for thermal coating, which reduces thermal input, enhances wear resistance, and improves microhardness, porosity, and thermal stability, eliminating the need for post-treatment processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermal coating methods are used for brake disks, then specific properties such as friction or wear resistance can be optimized, but the manufacturing process becomes complex and costly, requiring additional gas treatment processes
Solution Approach 1:
The invention changes the chemical composition parameters of the spray powder by incorporating specific amounts of graphite (1-5 wt%), rust inhibitors (2-8 wt%), and anti-corrosion agents (3-10 wt%) into the iron-based compound. This compositional modification allows the coating to achieve optimal friction and wear resistance properties directly during the thermal spraying process, eliminating the need for subsequent gas treatment processes and simplifying the manufacturing workflow while maintaining reliable brake disk performance
Solution Approach 2:
The invention creates a composite spray powder material consisting of an iron-based compound matrix combined with graphite particles, rust inhibitors, and anti-corrosion agents. This composite structure provides multiple functions in a single coating layer: the iron-based compound provides structural integrity and friction properties, graphite enhances lubrication and wear resistance, while the chemical additives provide corrosion protection. This multi-functional composite eliminates the need for separate treatment processes and reduces manufacturing complexity
2Manufacturing precision
If additional gas treatment processes are applied to achieve desired coating properties, then coating performance is improved, but manufacturing time and cost increase
Solution Approach 1:
The invention incorporates all necessary functional components (graphite for lubrication, rust inhibitors for corrosion protection, and anti-corrosion agents for chemical resistance) directly into the spray powder formulation before the thermal spraying process. This preliminary incorporation ensures that the coating achieves the desired friction, wear resistance, and corrosion protection properties during the initial spraying operation, eliminating the need for subsequent gas treatment processes and significantly reducing manufacturing cycle time while maintaining precise coating properties
3Reliability
If complex coating systems are used to meet multiple demands, then coating performance is enhanced, but manufacturing simplicity and cost-effectiveness are reduced
Solution Approach 1:
The invention designs a universal spray powder formulation where a single iron-based compound coating provides multiple functions simultaneously: structural support, friction control, wear resistance through graphite lubrication, and corrosion protection through embedded rust inhibitors and anti-corrosion agents. This multi-functional coating eliminates the need for complex multi-layer coating systems or subsequent treatment processes, achieving enhanced coating performance while maintaining manufacturing simplicity and cost-effectiveness through a single-step thermal spraying process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution results in brake disks with significantly improved service life, reduced mechanical wear, and enhanced resistance to heat and corrosion, with simplified manufacturing and reduced process steps, achieving optimal performance without the need for complex post-treatment.
Implementation Method 1
The invention relates to a spray powder made from a superferritic iron-based compound for the thermal coating of a substrate, in particular for the thermal coating of a brake disk of a vehicle
Implementation Method 2
which reduces thermal input
Implementation Method 3
enhances wear resistance, and improves microhardness, porosity, and thermal stability
Implementation Method 4
enhanced resistance to heat and corrosion
Data Source
AI summary
The invention relates to a spray powder with a superferritic iron-based compound for the thermal coating of a substrate, wherein the spray powder includes, apart from impurities, a chemical list from the list of chemical elements consisting of C, Mn, Cr, Mo, Ni, Nb, P, S, Si, Fe, Al, O, and Zr. In accordance with the invention, the spray powder has the following chemical composition: C at a maximum up to 0.7% by weight, Mn at a maximum up to 0.7% by weight; Ni at a maximum up to 0.5% by weight, Nb at a maximum up to 1.2% by weight, Pat a maximum up to 0.1% by weight, S at a maximum up to 0.1% by weight, Si at a maximum up to 0.2% by weight, Cr in the range from 20% to 40% by weight, Mo in the range 2.0% to 6% by weight, and a ceramic component Al2O3/ZrO2 up to a maximum of 50% by weight, with the remainder being Fe, and otherwise a total of a maximum of 0.4% by weight of further chemical components being contained as impurities. The invention furthermore relates to a substrate, in particular to a brake disk, having a superferritic thermal spray layer.