Metal-Diamond Laser Composite Coating for Abrasion Resistance
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Solution Overview
Problem
Current methods for preparing metal-based/diamond composite coatings face challenges such as low thickness, low diamond content, weak bonding between diamond and metal phases, easy decomposition of diamond, weak bonding strength between the coating and substrate, and difficulty in achieving high hardness and abrasion resistance.
Innovation Solution
A method involving the use of high-hardness metal powders (>50 HRC) as a binding phase, combined with diamond powders, using ball-milling and cold spraying assisted by laser texturing and continuous laser deposition to form a composite coating with a thickness greater than 1 mm and diamond content greater than 45%, enhancing bonding strength and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal spraying, spray welding, plasma transferred welding, laser cladding, or self-propagation combustion synthesis methods are used to prepare metal-based/diamond composite coating, then the coating can be formed, but the diamond particles undergo thermal decomposition and dissolution at high temperature, making it difficult to maintain diamond in the coating
Solution Approach 1:
The invention changes the temperature parameter from high-temperature processes (thermal spraying, laser cladding) to low-temperature cold spraying, fundamentally avoiding thermal decomposition of diamond while still achieving effective coating deposition and diamond integration in the metal matrix
Solution Approach 2:
The invention replaces thermal-field-based deposition methods with a mechanics-based cold spraying process, where kinetic energy of accelerated particles enables coating formation without thermal damage to diamond phases
2Quantity of substance
If electroplating or electroless plating methods are used to maintain diamond particles in the coating, then diamond content can reach 45%, but the bonding at the interface between diamond and binding phase deteriorates significantly when diamond volume content exceeds 25%
Solution Approach 1:
The invention uses a composite binding phase consisting of metal powder and organic binder in specific proportions, where the organic binder provides adequate adhesion to diamond particles while the metal powder ensures structural integrity, allowing high diamond content (up to 45%) without interface bonding deterioration
Solution Approach 2:
The invention changes the binding phase composition from pure metal to a composite system with organic binder, fundamentally improving the diamond-metal interface bonding mechanism and enabling high diamond content while maintaining strong adhesion
3Reliability
If electroplating or electroless plating methods are used to prepare metal-based/diamond composite coating, then diamond particles can be maintained in the coating, but the coating thickness is limited to under 200 μm and preparation efficiency is low
Solution Approach 1:
The invention replaces slow electrochemical deposition processes with rapid cold spraying, where high-velocity particle impact enables fast coating formation at thicknesses exceeding 200 μm while maintaining diamond particles through low-temperature processing
Solution Approach 2:
The cold spraying process enables continuous rapid deposition of thick coatings without the thickness limitations of electroplating, significantly improving preparation efficiency while maintaining diamond integrity through continuous low-temperature processing
4Reliability
If cold spraying method is used to prepare metal-based/diamond composite coating, then diamond particles can be maintained, but the bonding between coating and substrate is mainly mechanical lock with relatively weak bonding strength, easily resulting in delamination
Solution Approach 1:
The invention uses a composite binding phase with metal powder and organic binder that provides both mechanical interlocking and chemical adhesion to the substrate, significantly improving coating-substrate bonding strength while maintaining diamond particles through the low-temperature process
5Ease of manufacture
If conventional cold spraying is used to prepare composite coating on low-hardness metal substrates, then coating can be formed, but high-hardness metal-based/diamond composite coating is difficult to prepare and bonding between diamond particles and metal substrate is relatively weak
Solution Approach 1:
The invention changes the substrate hardness parameter by using high-hardness metal substrates (>50 HRC) that provide strong bonding to diamond particles, fundamentally improving the diamond-metal interface strength while maintaining ease of manufacture through the simple cold 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 method effectively increases the thickness and diamond content of the composite coating, improves bonding strength, and maintains diamond hardness and morphology, resulting in a high-efficiency, high-hardness metal-based/diamond composite coating with enhanced abrasion resistance and reduced thermal stress.
Implementation Method 1
a heating effect of the laser soften the high-hardness metal powder and the substrate material
Implementation Method 2
a new spraying technology realized by a collision between a substrate and low temperature solid particles at high speed that a severe plastic deformation is then occurred
Implementation Method 3
Uniformly mixing a high-hardness metal powder and a diamond powder to form a composite powder via a ball-milling method
Data Source
AI summary
A metal-based/diamond laser composite coating preparation method includes: first selecting high-hardness metal powder and diamond powder of a proper grain size and shape; then uniformly mixing the high-hardness metal powder and diamond powder via a ball-milling method; and finally preparing a composite coating on a substrate by synchronously combining laser texturing technology, laser thermal treatment technology and cold spraying technology. The thickness of the composite coating is greater than 1 mm, and the volume content of diamond in the coating is greater than 45%. A metal-based/diamond laser composite coating is also provided.