Mechanically Alloyed Thermal Spray Coating for Wear and Corrosion
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Solution Overview
Problem
Existing metal-based thermal spray coatings lack improved sliding and wear properties, particularly when exposed to corrosive environments and high frictional forces.
Innovation Solution
A metal-based thermal spray coating is developed using a thermal spray powder that includes one or more transition metals, such as Molybdenum or Chromium, mechanically alloyed with Aluminum, Magnesium, or Titanium alloys. This coating method enhances the alloying process during thermal spraying, resulting in improved wear and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional metallic thermal spray coatings are used, then coating application is simple, but sliding and wear properties are insufficient
Solution Approach 1:
The patent applies composite materials by combining transition metal powders (Mo, Cr) with aluminum alloy powders to create a mechanically alloyed composite coating material. This composite structure provides both the ease of thermal spray application and improved sliding/wear properties through the synergistic effects of the constituent materials, directly resolving the contradiction between manufacturing simplicity and performance reliability.
Solution Approach 2:
The patent changes the chemical composition parameters of the coating material by incorporating specific transition metals (Molybdenum 1-10 wt%, Chromium 1-10 wt%) into the aluminum alloy matrix. This parameter modification transforms the coating properties to achieve better sliding and wear resistance while maintaining the thermal spray applicability, thus resolving the contradiction between ease of manufacture and reliability.
2Reliability
If transition metals are added to improve wear resistance, then sliding properties improve, but coating complexity increases
Solution Approach 1:
The patent controls the composition parameters by limiting transition metal content to specific ranges (Mo: 1-10 wt%, Cr: 1-10 wt%) and maintaining aluminum as the base (80-98 wt%). This parameter optimization achieves improved wear resistance through controlled alloying without excessive complexity in coating composition or application process.
3Reliability
If mechanically alloyed powder is used, then corrosion resistance improves, but manufacturing process complexity increases
Solution Approach 1:
The patent performs preliminary mechanical alloying of transition metals with aluminum powder before thermal spraying. This pre-alloying action creates a homogeneous composite powder that improves corrosion resistance upon coating formation, while the standardized pre-processing maintains ease of manufacture through a systematic two-step process (mechanical alloying + thermal spraying).
Solution Approach 2:
The mechanically alloyed composite powder combines transition metals with aluminum alloy in a controlled microstructure that enhances corrosion resistance. The composite nature provides protective characteristics while the established mechanical alloying process keeps manufacturing feasible, resolving the contradiction between improved reliability and manufacturing simplicity.
4Adaptability or versatility
If aluminum alloy coatings are used, then coating applicability is good, but corrosion resistance deteriorates in chloride environments
Solution Approach 1:
The patent creates a composite coating material by combining aluminum alloy (maintaining good applicability) with transition metals Mo and Cr (providing corrosion resistance). The composite structure leverages the advantages of both material types: aluminum's ease of application and transition metals' corrosion resistance in chloride environments, directly resolving the contradiction between adaptability and reliability.
Solution Approach 2:
The patent modifies the chemical composition parameters by adding transition metals to the aluminum alloy matrix, changing its corrosion behavior in chloride environments. This parameter adjustment maintains the coating's applicability while significantly improving its corrosion resistance through the protective effects of Mo and Cr additions.
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 resulting coating exhibits enhanced sliding and wear properties, along with improved corrosion resistance, effectively addressing the limitations of current thermal spray coatings.
Implementation Method 1
Thermal spraying is a coating process in which melted or heated materials are sprayed onto a surface. The feedstock, or coating precursor, may be heated by electrical processes, e.g., plasma or arc, or by chemical processes, e.g., combustion flame.
Implementation Method 2
Mechanical alloying is a solid-state and powder processing technique involving repeated cold welding, fracturing, and re-welding of blended powder particles in, e.g., a high-energy ball mill to produce a material, e.g., a homogeneous material.
Implementation Method 3
Ball milling is a grinding method that grinds a material into a powder. During the ball milling process, repeated collisions are generated between the material and small rigid balls of ceramic, flint pebbles and/or stainless steel in a concealed container to generate localized pressure that breaks down the material into the powder.
Data Source
AI summary
Thermal spray coating obtained from a thermal spray powder material containing at least one of Aluminum-containing particles, Magnesium-containing particles, and Titanium-containing particles mechanically alloyed to a transition metal. The coating includes Aluminum, Magnesium, or Titanium alloy portions alloyed to the transition metal. The thermal spray powder is obtained of Aluminum, Magnesium, or Titanium containing particles mechanically alloyed to a transition metal.