Technical indicators of high-quality diamond micro powder

The technical indicators of high-quality diamond micro-powder mainly include the following aspects:

1. Particle Size Distribution

Particle Size Range: The particle size of diamond micro-powder typically ranges from 0.1 to 50 micrometers. Different applications have varying requirements for particle size.

Characterization of Particle Size Distribution:

D10: The particle size corresponding to 10% cumulative distribution, indicating the proportion of fine particles.

D50 (Median Size): The average particle size, which is the core parameter of the size distribution.

D95: The particle size corresponding to 95% cumulative distribution, controlling the content of coarse particles.

Mv (Volume Mean Size): More affected by large particles, used to evaluate the distribution of the coarse end.

Detection Methods: Laser diffraction and sieve analysis are commonly used.

2. Particle Shape

Shape Parameters:

Roundness: The closer the roundness is to 1, the more spherical the particles are, resulting in better polishing performance.

Flake Particles: Particles with a light transmittance > 90% are considered flake-like, and their proportion should be less than 10%.

Needle-like Particles: Particles with a length-to-width ratio > 3:1 should be strictly controlled, with a proportion not exceeding 3%.

Detection Methods: Optical microscopy is suitable for observing the shape of particles larger than 2 micrometers, while scanning electron microscopy (SEM) is used for the morphological analysis of nano-sized ultrafine particles.

 

3. Purity and Impurity Control

Purity: The purity of diamond micro-powder should be > 99%, with metal impurities (such as iron and copper) and harmful substances (sulfur, chlorine) strictly controlled below 1%.

Magnetic Impurities: The magnetic susceptibility should be low to avoid particle agglomeration, which can affect precision polishing.

 

4. Physical Properties

Impact Toughness: Assessed by the percentage of unbroken particles or the number of half-breaks after impact testing, which directly affects the durability of grinding tools.

Thermal Stability: The micro-powder should remain stable at high temperatures (e.g., 750–1000°C) to prevent graphitization or oxidation that can reduce strength.

Microhardness: The microhardness of diamond micro-powder is as high as 10000 kg/mm².

 

5. Application Compatibility

Balance between Particle Size Distribution and Processing Effects: Coarse particles (e.g., high D95) improve grinding efficiency but reduce surface finish quality, while fine particles (low D10) have the opposite effect.

Shape Adaptation: Blocky, multi-edged particles are suitable for resin grinding wheels, while spherical particles are ideal for precision polishing.

 

6. Detection Methods and Standards

Particle Size Detection: Laser diffraction and sieve analysis.

Shape Detection: Particle image analysis instruments can quantify parameters such as sphericity.

Standard Systems: Common international standards include ANSI and ISO.

 

These technical indicators directly affect the performance of diamond micro-powder in various industrial applications, such as polishing, grinding, and cutting.