Monocrystalline Diamond Abrasive Grain Coating via Dual-Scale Metal Dispersion
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Solution Overview
Problem
Existing methods for coating monocrystalline diamond powders with metal powders of similar particle sizes face challenges in forming uniform coatings, leading to poor self-sharpening and increased raw material consumption, resulting in inefficient grinding performance.
Innovation Solution
A method involving dispersing micron-scale monocrystalline diamond and metal powders in a sol containing nano-scale metal powders, followed by granulation and heat treatment, to form a composite particle with a uniform metal coating, reducing voids and enhancing surface contact, thereby improving self-sharpening and grinding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If micron-scale metal powder and micron-scale diamond powder are mixed to form a coating, then the coating can be formed on the diamond surface, but the contact between particles is insufficient resulting in non-uniform coating and larger pits on the surface
Solution Approach 1:
The metal powder is segmented into two size ranges: fine powder (0.1-1 μm) and ultra-fine powder (0.01-0.1 μm). This segmentation allows the fine powder to provide structural framework while the ultra-fine powder fills gaps and forms uniform coating on diamond particle surfaces, resolving the contact insufficiency issue.
Solution Approach 2:
Different regions of the coating have different particle size distributions. The fine metal powder (0.1-1 μm) forms the base layer providing structural support, while the ultra-fine metal powder (0.01-0.1 μm) concentrates at the surface to create uniform coating and fill pits, achieving local optimization of coating quality.
2Manufacturing precision
If a large amount of iron powder is used to ensure sufficient surface contact, then coating coverage is improved, but raw material waste increases and acid post-treatment burden increases
Solution Approach 1:
The metal powder is divided into two size ranges with different functions: fine powder (0.1-1 μm) provides structural framework with lower quantity, while ultra-fine powder (0.01-0.1 μm) ensures surface coverage and uniform coating. This segmentation reduces total metal powder consumption while maintaining adequate surface contact.
Solution Approach 2:
The particle size parameter of metal powder is changed from single-scale to dual-scale distribution. The ultra-fine powder (0.01-0.1 μm) has higher surface area to volume ratio, providing sufficient contact with diamond particles at lower quantities, thereby reducing raw material waste and post-treatment burden.
3Reliability
If micron-scale metal powder is used for coating, then the coating can be formed, but the self-sharpening performance is poor due to insufficient contact points
Solution Approach 1:
The metal powder is segmented into fine (0.1-1 μm) and ultra-fine (0.01-0.1 μm) particles. The ultra-fine powder creates numerous contact points on diamond particle surfaces, enhancing self-sharpening performance through increased contact density during grinding operations.
Solution Approach 2:
The ultra-fine metal powder (0.01-0.1 μm) is concentrated at the surface region of the coating, creating high-density contact points where they are most needed for self-sharpening. This local quality enhancement improves reliability without requiring excessive metal powder throughout the entire coating structure.
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 achieves a uniform metal coating on monocrystalline diamond abrasive grains, enhancing self-sharpening and grinding force, while reducing raw material consumption and processing costs, resulting in improved surface morphology and grinding performance.
Implementation Method 1
dispersing a micron-scale monocrystalline diamond and at least a micron-scale metal powder into a sol containing at least a nano-scale metal powder, and stirring to form a uniformly dispersed slurry
Implementation Method 2
placing the composite particle of step (2) into an vacuum furnace and heating at a temperature of 600-1000° C. for 0.5-5 hours
Implementation Method 3
the metal coating can promote a phase transformation from diamond to graphite
Implementation Method 4
processing acid cleaning and non-diamond carbon dissolution
Implementation Method 5
the metal coating on the diamond surface is cleaned and dissolved by using common acid and non-diamond carbon on the surface of diamond micro powder is removed by using oxidative acid
Data Source
AI summary
The present invention relates to method of preparing a monocrystalline diamond abrasive grain comprising the steps of: sufficiently dispersing a micron-scale monocrystalline diamond and at least a micron-scale metal powder in a sol containing at least a nano-scale metal powder, and controlling the suitable ratio of the two kinds of metal powder with different order of magnitude of particle size, accordingly the micron-scale metal powder can be stuffed into voids among the monocrystalline diamond grains, and only a suitable amount of nano-scale metal powder is required to let the micron-scale metal powder and nano-scale metal powder coat together on the surface of the micron-scale diamond to form an integral and uniform coating layer including at least two kinds of metal grains, thus the resulting monocrystalline diamond abrasive grains have a unique rough-surface morphology, a plurality of contact points and contact surfaces resenting in the grinding process and good self-sharpening.