Remanufacturing Cast Iron with Aluminum Intermediate Layer
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Solution Overview
Problem
High pressure cold spray processes on cast iron components result in poor bonding due to fracturing of graphite flakes, and the subsequent steel coatings are prone to corrosion when exposed to caustic solutions.
Innovation Solution
A remanufactured cast iron component with a cast iron base, an intermediate layer of aluminum and nickel, cobalt, chromium, silicon, or iron, and an outer steel layer is created using a method involving machining, deposition of molten particles to form an intermediate layer, and subsequent deposition of solid steel particles to minimize fracturing and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high pressure cold spray is used to form steel coating on cast iron substrate, then steel coating is formed, but bonding is poor due to fracturing of graphite iron flakes
Solution Approach 1:
A copper or aluminum intermediate layer is deposited between the steel coating and cast iron substrate. This intermediate layer absorbs collision energy from the high pressure cold spray process, preventing direct impact on graphite flakes and reducing fracturing, thereby improving bonding strength.
Solution Approach 2:
The intermediate layer changes the mechanical parameters of the coating-substrate system by providing a more malleable transition zone. The copper or aluminum intermediate layer has different hardness and ductility characteristics that reduce stress concentration during particle impact.
2Strength
If copper or aluminum particles are mixed with steel particles to prevent graphite flake fracturing, then bonding improves, but corrosion resistance deteriorates in caustic solutions
Solution Approach 1:
The coating structure is designed with different materials at different locations: copper or aluminum intermediate layer in direct contact with the cast iron substrate to prevent fracturing, and a pure steel outer layer exposed to the environment to provide corrosion resistance. Each layer performs its specific function locally.
Solution Approach 2:
The coating system uses a composite structure with two distinct material layers: a copper or aluminum intermediate layer for mechanical bonding and a steel outer layer for corrosion protection. This composite approach allows each material to contribute its superior properties.
3Object-generated harmful factors
If copper or aluminum are used as intermediate layer to absorb collision energy, then graphite flake fracturing is reduced, but corrosion resistance is compromised
Solution Approach 1:
The coating structure is designed with different materials at different locations: copper or aluminum intermediate layer in direct contact with the cast iron substrate to prevent fracturing, and a pure steel outer layer exposed to the environment to provide corrosion resistance. Each layer performs its specific function locally.
Solution Approach 2:
The coating system uses a composite structure with two distinct material layers: a copper or aluminum intermediate layer for mechanical bonding and a steel outer layer for corrosion protection. This composite approach allows each material to contribute its superior properties.
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 effectively reduces fracturing of graphite flakes during high pressure cold spray and maintains corrosion resistance of the steel coating, ensuring a durable and reliable remanufactured component.
Implementation Method 1
depositing molten particles on the cast iron base to form a pool of agglomerated molten particles
Implementation Method 2
depositing molten particles on the cast iron base to form a pool of agglomerated molten particles
Implementation Method 3
cooling the pool to form a solid intermediate layer
Implementation Method 4
cooling the pool to form a solid intermediate layer
Implementation Method 5
colliding particles, often containing metals, with a stationary substrate using a high pressure cold spray apparatus
Implementation Method 6
The collision between the particles and the stationary substrate is substantially inelastic, causing the particles to deform and adhere to the substrate
Data Source
AI summary
Method of remanufacturing a component comprising: removing a damaged area of a cast iron component, the remaining component constituting a cast iron base; depositing molten particles on the cast iron base to form a pool of agglomerated molten particles, wherein the pool comprises aluminum and at least one of nickel, cobalt, chromium, silicon, or iron; cooling the pool to form a solid intermediate layer; and depositing solid particles on the solid intermediate layer to form an outer layer, wherein the solid particles comprise steel. Additionally, a component comprising: a cast iron base; an intermediate layer covering at least a portion of the cast iron base, wherein the intermediate layer comprises aluminum and at least one of nickel, cobalt, chromium, silicon, or iron; and an outer layer covering the intermediate layer, wherein the outer layer comprises steel.