Technical indicators of high-quality diamond micro powder

The technical indicators of high-quality diamond micro powder involve multiple dimensions such as particle size distribution, particle shape, purity, and physical properties, which directly affect its application effect in different industrial scenarios (such as polishing, grinding, cutting, etc.). The following are the key technical indicators and requirements for organizing comprehensive search results:

 

1, Particle size distribution and characterization parameters
01) Particle size range
The particle size of diamond micro powder is usually 0.1-50 microns, and there are significant differences in particle size requirements for different application scenarios

• Polishing: Use micro powders ranging from 0-0.5 microns to 6-12 microns to reduce scratches and improve surface smoothness.
• Grinding: Micro powders ranging from 5-10 microns to 12-22 microns are more suitable, balancing efficiency and surface quality.
• Fine grinding: 20-30 micron micro powder can improve grinding efficiency.

 

02)Characterization of particle size distribution

• D10: The cumulative distribution of 10% corresponds to the particle size, reflecting the proportion of fine particles. It is necessary to control the proportion of fine particles to avoid a decrease in grinding efficiency.
• D50 (median diameter): represents the average particle size, which is the core parameter of particle size distribution and directly affects processing efficiency and accuracy.
• D95: Accumulate the particle size corresponding to 95% of the distribution, control the coarse particle content (if D95 exceeds the standard, it may cause scratches on the workpiece).
• Mv (volume average particle size): greatly affected by large particles, used to evaluate the coarse end distribution.

 

03)Standard system

International commonly used standards include ANSI (such as D50, D100) and ISO (such as ISO 6106:2016)

 

2, Particle shape and surface characteristics
01) Shape parameter

• Roundness: The closer the roundness is to 1, the closer the particles are to spherical shape, and the better the polishing effect; Particles with low roundness (multiple edges and corners) are more suitable for scenarios such as electroplating wire saws that require sharp cutting edges.
• Flake shaped particles: particles with a light transmittance greater than 90% are considered as flakes, and the proportion needs to be less than 10%; Excessive flake particles can lead to particle size detection deviation and unstable application effects.
• Needle shaped particles: particles with an aspect ratio greater than 3:1 need to be strictly controlled, with a proportion not exceeding 3%.

 

02 Shape detection method

• Optical microscope: suitable for observing the shape of particles larger than 2 microns.
• Scanning electron microscopy (SEM): used for morphology analysis of nanoscale ultrafine particles

 

3, Purity and impurity control
01) impurity content

• Diamond purity must be>99%, and metal impurities (such as iron and copper) and harmful substances (sulfur and chlorine) must be strictly controlled below 1%.
• Magnetic impurities need to be low to avoid agglomeration affecting the precision polishing effect.

 

02)magnetic susceptibility

• High purity diamond should be close to non-magnetic, and a high magnetic susceptibility indicates residual metal impurities, which need to be detected by electromagnetic induction and other methods

 

4, Physical performance indicators
01) impact toughness

• Characterizing the anti crushing ability of particles, evaluating the non crushing rate (or semi crushing times) after impact testing, directly affects the durability of grinding tools.

 

02)thermal stability

• Micro powder needs to maintain stability at high temperatures (such as 750-1000 ℃) to avoid strength reduction caused by graphitization or oxidation; Commonly used thermogravimetric analysis (TGA) method for detection.

 

03)Microhardness

• The microhardness of diamond micro powder can reach up to 10000 kg/mm ², and it is necessary to ensure high particle strength to maintain cutting efficiency

 

5, Application adaptability requirements
01) Balance between particle size distribution and processing effect

• Coarse particles (such as high D95) improve grinding efficiency but reduce surface smoothness; Fine particles (D10 smaller) are the opposite. The distribution range needs to be adjusted according to demand.

 

02) Shape adaptation

• Block shaped multi blade particles are suitable for resin grinding wheels; Spherical particles are suitable for precision polishing.

 

• 6, Testing methods and standards

01) Granularity detection

• Laser diffraction method: widely used for micron/submicron sized particles, with simple operation and reliable data.
• Screening method: only applicable to particles above 40 microns.

 

02)shape detection

• Particle image analyzer can quantify parameters such as sphericity, reducing manual observation errors

 

summarize
High quality diamond micro powder requires comprehensive control of particle size distribution (D10/D50/D95), particle shape (roundness, flake/needle content), purity (impurities, magnetism), and physical properties (strength, thermal stability). Production enterprises need to optimize parameters according to application scenarios and ensure stable quality through detection methods such as laser diffraction and electron microscopy. When users choose, they should match the indicators based on specific processing needs (such as efficiency and smoothness). For example, precision polishing should prioritize controlling D95 and roundness, while rough grinding can relax shape requirements to improve efficiency