Grinding Media
(Authorized dealers - DISTRIBUTOR of Preciballs S.A)
Grinding media are the means used to crush or grind material in a mill, ink ,food or other industries . Grinding media sorting is performed when the ball load wears out. New grinding balls are then added or full reload is carried out to keep optimum filling degree and hence mill performance.
Authorized high-precision grinding media supplier.
Ceramic Balls
Ceramic Balls are mainly used in harsh environments. Their main advantages on steel is that they have a density 40% lower than steel, have 29% lower thermal expansion and are 150% harder. In certain high-speed applications their life is extended hundred times. It is also used as grinding media. 3 main types are-
| Alumina Oxide - Ceramic Balls | |
|---|---|
| Composition | 99.5% Al2O3 / 0.5% other |
| Hardness | 1700 Hv |
| Ultimate Tensile Strength | 31,000 psi |
| Ultimate Compressive Strength | 31,000 psi |
| Modulus of Elasticity | 53 x106 psi |
| Maximum Working Temperature | 1400oC |
| Corrosion Resistance | Inert except for hydruofluric, hydrochloric acid and hot concentrated sulphuric acids. Inert to most substances, not recommended for environments of strong alkaline solutions |
| Zirconia Oxide - Ceramic Balls | |
|---|---|
| Composition | 97% ZrO2 / 3% MgO |
| Hardness | 80 - 84 Ra |
| Ultimate Tensile Strength | 60,000 psi |
| Ultimate Compressive Strength | 285,000 psi |
| Modulus of Elasticity | 29 x106 psi |
| Maximum Working Temperature | 2400oC |
| Corrosion Resistance | Inert to most substances, not recommended for environments of hydrochloric or strong alkaline solutions |
| Silicon Nitride - ceramic balls | |
|---|---|
| Composition | 87% Si3N4 / 13% other |
| Hardness | 1400 - 1700 Hv |
| Ultimate Tensile Strength | / |
| Ultimate Compressive Strength | >570,000 psi |
| Modulus of Elasticity | 44-45 x106 psi |
| Maximum Working Temperature | 1000oC |
| Corrosion Resistance | Inert to most substances. |
Chrome Steel Balls
Chrome Steel Balls are widely used in high speed ball bearings, valve industry, as well as, in a number of other industrial applications. Chrome steel balls have excellent surface quality, high hardness, high load bearing capacity and wear resistance, as a result of through hardening.
Chrome Steel Balls of 2mm OD,Hardness should be around 60HRC:
- China GCr15- P 0.03 % max.
- Hardness 60-66°HRC.
- Density 7.85 g/cm³
Applications:
- Ball Bearings.
- Valve Industry.
- Ball Screws.
- Automotive Industry.
- Machine Tools.
- Grinding Applications.
Stainless Steel Balls
Application:
- Grinding of solids and fluids.
- Liquids dispersion.
- Fine particle size reduction.
- Homogenization of fillers and raw materials.
- Attrition and pulverizing applications in ball, vibro, dyno, pearl, bead, pebble, attritor and small-media mills, vertical or horizontal.
Stainless steel balls and other shapes are used for grinding applications where absolutely no iron contamination is permissible, specially in food products:
| Specification (stainless steel balls) | Hardness | Density |
|---|---|---|
| AISI 420 | 55/58 Hrc | 7.75 |
| AISI 440C | 58/64 Hrc | 7.75 |
| AISI 302 | 25/39 Hrc | 7.93 |
| AISI 304(L) | 25/39 Hrc | 7.93 |
| AISI 316(L) | 25/39 Hrc | 7.98 |
| AISI 904 | 150/300 HV | 8 |
| AISI 430 | 135/380 HV | 7.68 |