Nickel-Based Super Alloy Extrusion Die Coating Adhesion
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Solution Overview
Problem
Hot extrusion die tools made from super alloys experience significant wear during the high-temperature extrusion of copper and copper alloys, and existing wear-resistant coatings tend to delaminate during the heat treatment process, compromising the strength and hardness of the tooling material.
Innovation Solution
A method involving the application of a wear-resistant coating, such as TiCN/Al2O3, to nickel-based super alloy die tools, followed by a modified heat treatment protocol that includes specific solutionizing, quenching, and aging steps to maintain coating adhesion and restore the desired strength and hardness properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wear-resistant coating is applied to super alloy die tools, then wear resistance is improved, but coating adhesion deteriorates during heat treatment
Solution Approach 1:
The coating is applied to the die tool surface before heat treatment, establishing the wear-resistant layer in advance. The preliminary coating application allows subsequent heat treatment parameters to be optimized for both coating adhesion and base material strength, rather than requiring post-coating heat treatment that compromises adhesion.
Solution Approach 2:
The patent modifies heat treatment parameters (temperature, time, atmosphere) to create a compatible thermal process that maintains coating adhesion while achieving the desired base material strength. By changing the heat treatment parameters from conventional settings, the coating survives the process without delaminating.
2Strength
If conventional heat treatment is applied to restore strength, then base material strength is improved, but coating delaminates
Solution Approach 1:
Conventional heat treatment parameters are modified to create a controlled thermal process. The temperature profile, holding time, and cooling rate are adjusted to minimize thermal stress at the coating-substrate interface, preventing delamination while still achieving the necessary base material strength through controlled precipitation hardening.
Solution Approach 2:
The coating is applied before heat treatment, allowing the heat treatment process to be designed and optimized around the coating's thermal characteristics. This preliminary positioning enables the heat treatment to strengthen the base material without subsequent coating application that would risk delamination.
3Reliability
If high temperature processing is used for coating deposition, then coating quality is improved, but base material strength deteriorates
Solution Approach 1:
The coating deposition is performed as a preliminary step before final heat treatment. This allows the coating to be applied at optimal temperatures for coating quality, followed by a controlled heat treatment that restores base material strength without compromising the already-deposited coating.
Solution Approach 2:
The processing parameters are changed and separated into distinct stages: coating deposition at high temperature for quality, followed by controlled heat treatment at optimized parameters for strength. This parameter separation allows each process to be optimized independently without compromising the other.
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 approach significantly reduces wear rates and maintains the strength of the die tools, extending their lifespan and reducing the need for frequent replacement, while ensuring the coating adheres properly to the substrate, thus enhancing the efficiency and durability of the extrusion process.
Implementation Method 1
a wear resistant coating, such as a hard thin-film of Al2O3, which can be deposited by chemical vapor deposition (CVD)
Implementation Method 2
Solutionizing involves heating the super alloy above its solvus temperature to dissolve soluble intermetallic phases into a solid solution
Implementation Method 3
The material is then quenched to make a supersaturated solid solution
Implementation Method 4
followed by heating for a specified duration at a sub-solvus temperature to age the material and produce fine precipitates of intermetallic phases to strengthen and harden the alloy
Data Source
AI summary
A hot extrusion die tool and a method of making the hot extrusion die tool are provided. The hot extrusion die tool includes a die tool component including a nickel-based super alloy; and a wear resistant coating deposited on the die tooling component. The method of making the hot extrusion die tool includes coating at least one portion of an extrusion die tool component comprising a nickel-based super alloy with a wear resistant coating at a high temperature; and hardening the extrusion die tool component and the at least one coated portion.