Ion-Implanted Metal Powder Particles With Ceramic Surface Layers
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Solution Overview
Problem
Existing ion implantation methods are limited to treating solid objects with conventional machining techniques, restricting the geometric shapes that can be achieved and do not effectively enhance the mechanical properties of treated materials.
Innovation Solution
A method for surface treatment of metal powder particles using singly- or multi-charged ion beams, specifically produced by an ECR electron cyclotron resonance ion source, to create a ceramic surface layer on metal powder particles, enhancing mechanical and physical properties while maintaining the original metal structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ion implantation is applied to solid objects with conventional machining techniques, then mechanical properties are improved, but geometric shape freedom is restricted
Solution Approach 1:
The invention segments the treatment object from solid blocks to metal powder particles. By treating individual particles in powder form rather than solid objects requiring machining, the method enables complex geometric shapes to be formed after sintering without being constrained by conventional machining limitations, while still achieving improved mechanical properties through ion implantation
Solution Approach 2:
The invention changes the physical state parameter of the metal from solid block form to powder particle form. This parameter change enables the metal to be treated by ion implantation and then processed into complex geometric shapes through powder metallurgy techniques, resolving the contradiction between mechanical property improvement and geometric shape freedom
2Shape
If ion implantation is applied to metal powder particles, then geometric shape freedom is improved, but mechanical property enhancement may be reduced
Solution Approach 1:
The invention applies ion implantation treatment to metal powder particles before sintering. This preliminary action modifies the surface properties and microstructure of the particles, which then contribute to enhanced mechanical properties in the final sintered component, maintaining mechanical property enhancement while enabling geometric shape freedom
Solution Approach 2:
The ion implantation process creates a composite structure within the metal particles by introducing foreign ions into the metal matrix. This composite microstructure at the particle level translates to improved mechanical properties in the bulk material, while the powder form enables complex geometric shaping
3Reliability
If ECR ion source is used to produce singly- or multi-charged ion beams, then treatment effectiveness is improved, but device complexity increases
Solution Approach 1:
The ECR ion source is designed to produce both singly-charged and multi-charged ion beams, providing multi-functionality. This universal capability allows optimization of treatment effectiveness for different metal powders and desired outcomes without requiring multiple different ion sources, thereby managing device complexity while maintaining treatment effectiveness
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 allows for the production of metal powder particles with improved hardness, corrosion resistance, and tribological properties, suitable for use in powder metallurgy and additive manufacturing, enabling the creation of parts with unrestricted geometric shapes.
Implementation Method 1
An ECR ion source uses electron cyclotron resonance to create a plasma. A volume of low-pressure gas is ionised by microwaves injected at a frequency corresponding to the electron cyclotron resonance defined by a magnetic field applied to a region located inside the volume of gas to be ionised.
Implementation Method 2
Ion implantation methods consist of bombarding the surface of an object to be treated, for example using a source of singly- or multi-charged ions of the electron cyclotron resonance type. The ions produced correspond to the type of gas used. This gas can be pure or a compound. It can also be a vapour obtained from a solid or liquid material.
Data Source
AI summary
A method for surface treatment of a metal material in a powder state is provided, the method including obtaining a powder formed from a plurality of particles of the metal material to be treated; and subjecting the powder to an ion implantation process by directing a beam of singly-charged or multi-charged ions towards an outer surface of the particles, the beam being produced by a source of singly-charged or multi-charged ions, whereby the particles have an overall spherical shape with a radius (R). There is also provided a material in a powder state formed from a plurality of particles having a ceramic outer layer and a metal core, the particles having an overall spherical shape.