What is Diamond Micro Powder?

The particle size in powder science is divided into several levels as follows:

Nano (1-100nm), Submicron (0.03-1μm), Particle (1-10μm), Fine Grain (10-100μm), Coarse Grain (0.1-1mm).

Our "micro-fine" particles, according to industry standards, range from 0 to 0.5 to 36 to 54 micrometers. In the field of powder science, they fall into the categories of sub-micron, fine particles, and fine grains. Therefore, particles finer than 1 micrometer are also referred to as ultra-fine powders.

Diamond Micro Powder Classification: It can be categorized into single crystal diamond micro powder, polycrystalline diamond micro powder, quasi-polycrystalline diamond micro powder, and nano diamond. Polycrystalline diamond micro powder is generally produced by the detonation method, with particle sizes mainly in the nanometer and submicron range, rarely exceeding 10 micrometers. Nano diamond can also be produced by grading single crystal diamond micro powder, but the efficiency is low, and particle size control is challenging. What we commonly refer to as micro powder usually refers to single crystal diamond micro powder, primarily obtained by crushing single crystal materials, with a small amount grown through direct静pressure.

What are the applications of diamond micro-powder?

Diamonds are suitable for processing hard and brittle materials, as well as non-metals. Therefore, diamond micro-powders can be used to produce bonded abrasives, fluid abrasives, electroplated cutting products, or polycrystals, which can be utilized in the processing of ceramics, glass, hard alloys, magnetic materials, gems, non-ferrous metals such as copper and aluminum, cast iron, and more.

3. Production Process of Diamond Micro Powder?

Production Process: Diamond raw material → Crushing and shaping → Acid treatment → Water washing → Ultrasonic dispersion treatment → Particle size grading → Individual particle size acid treatment → Drying → Particle size inspection → Weighing, packaging, and storage.

Diamond micro-powders are typically produced using low-grade materials, commonly referred to as Type 1 material in colloquial terms. However, for specific requirements and applications, such as diamond wire saws, glass drill bits, and other electroplated products, Type 3 material is used for better quality.

What are the differences between air classifier crushing and整形 and ball mill crushing and整形?

Crushing and shaping are crucial steps in the production of diamond micropowders. Previous production processes primarily employed ball milling for crushing, which mainly involves compression and is supplemented by a moderate amount of low-speed mechanical impact. Currently, it has been replaced by air jet milling.

Airflow mill working principle: Compressed air is rapidly jetted into the crushing chamber through nozzles, where the diamond particles are repeatedly collided, abraded, and sheared at the intersection points of multiple high-pressure gas streams, resulting in crushing. The high-speed collisions粉碎 particles, while the abrasive and shearing actions break the particle surfaces, achieving shaping.

Both processes have their pros and cons: for instance, air jet mills have high破碎efficiency. However, they tend to cause high internal stress in the micro-powder particles; the sharp edges wear down significantly, leading to more rounded abrasive particles. Ball mills primarily suffer from low efficiency, but the actual performance of the micro-powder is still quite good.

Why is it necessary to add a dispersant during the micro-fine hydraulic sorting process?

Micron size classification commonly employs the natural hydrostatic sedimentation method. The settling speed of particles is inversely proportional to the viscosity of the medium. Slower settling speeds facilitate better classification, hence the addition of dispersants to increase the medium's viscosity. Dispersants are typically sodium silicate, but can also include gum arabic, glycerin, gelatin, and others.