Polishing Materials: Uses and Ingredients of Polishing Powder

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Polishing is a vital process in material finishing, and at its core lies the use of polishing powder. This essential component plays a crucial role in abrasively refining workpieces. The quality of the polishing process hinges on the specific requirements of the polishing powder, including fine particle strength, significant hardness, uniform particle size distribution, and a resilient polyhedral shape that resists fragmentation.

Polishing Micro Powder in Metallography

In the realm of metallography, polishing micro powder serves various functions. It is a key ingredient in creating polishing suspensions, spray polishing agents, and additives for polishing materials and pastes. The standards for micro powder were initially set in the 1983 version of GB2477, denoting them with the symbol 'W,' This system consisted of nine grades, ranging from W63 to W5. Additionally, it subdivided W5 and below into five more grades: W3.5, W2.5, W1.5, W1.0, and W0.5. These specifications have since been replaced by the new standard, GB/T2481-1998. This revised standard defines coarse abrasive grains with 26 designations from F4 to F220, encompassing a basic grain sieve aperture size ranging from 4.75mm to 63 micrometers.

Types of Polishing Powder Abrasives

1. Diamond: Characterized by its sharp, keen-edged particles, diamonds exhibit excellent abrasion properties, extended longevity, and minimal deformation. They are suitable for both rough and fine polishing across a wide array of materials.

2. Silicon Carbide (Carborundum): With its distinctive green hue and coarser particles, silicon carbide is employed for grinding and rough polishing applications.

3. Aluminum Oxide (Corundum): Transparent and white, corundum particles have a multi-faceted structure. They are utilized for both coarse and fine polishing.

4. Chromium Oxide: Sporting a green hue and boasting high hardness, chromium oxide is slightly inferior to aluminum oxide in terms of polishing capabilities. It finds application in the post-quenching polishing of alloy steel, high-speed steel, and titanium alloys.

5. Magnesium Oxide: Exhibiting a fine, uniform granularity and sharp, octahedral morphology, white magnesium oxide is adept at polishing non-metallic inclusions in aluminum, magnesium alloys, and steels.

Polishing Powder Grain Sizes

- W0.5, W1, W1.5, W2.5, W3.5, W5, W7

- W10, W14, W20, W28, W40, W50, W63

- Corresponding Grit Sizes: 240, 220, 180, 150, 120, 100, 90, 80, 70, 60, 46, 36

Abrasive Carriers

These include polishing suspensions, grinding pastes, and micro powder, which serve as the mediums through which the abrasive particles are delivered to the workpiece surface during the polishing process.

Understanding the types, characteristics, and appropriate applications of various polishing powders is essential for achieving optimal results in material polishing. productivity and product quality in the industry.