Products
Precision Ceramic Balls
Density : 3.2-6.0 g/cm3
Hardness : Mohs 8-9
Max. Working Temperature : 1200-1700 degree C
Application : Bearing, Valves, Pumps
Send Inquiry
Product Introduction
High precision ceramic balls are made from technical industrial ceramics, e.g. Alumina(Al2O3), Zirconia(ZrO2), Silicon Carbide (SiC) and Silicon Nitride (Si3N4). Ceramic balls for bearings and valves are suitable for to be used in the fields where variables are high velocities and extreme temperatures. High precision ceramic valve balls are normally customized, UNIPRETEC is very good at manufacturing as per drawings from customers. Ceramic bearing balls are suitable for challenging industries because of the requirement for long service life and limited lubrication, the standard grades vary from G3 to G20, G5 bearing ball is the most popular. Engineered fine ceramics, when fabricated as ball, is non-magnetic, never resut, corrosion resistant and is lighter and tougher than steel. Since high precision technical ceramic balls are non-porous, they are practically friction-less, allowing them to spin more quickly than steel balls.
General Advantages
√ Never Rust | √ Low Density | √ High Hardness |
√ Electrical Insulator | √ High Elastic Modulus | √ Low Thermal Expansion |
√ High Corrosion Resistance | √ Non-metallic and Non-Magnetic | √ Ability To Run Without Lubrication |
Technical Characteristics
ITEM | UNIT | ALUMINA | A990 | ZIRCONIA | YSZ95 | SILICON NITRIDE | GPSN |
Main Content | - | 99% Al2O3 | ZrO2>94.5% | Si3N4>95% |
Color | - | Ivory | White | Black |
Density | g/cm3 | 3.85 | 5.95 | 3.22 |
Vickers Hardness | Gpa | 17 | 12 | 15 |
Flexural Strength | Mpa | 360 | 800 | 580 |
Compressive Strength | Mpa | 2,500 | 2,500 | 2,200 |
Electrical Resistivity | Ω·cm | >1014 | >1010 | >1012 |
Dielectric Strength | KV/mm | 17 | 9 | 19 |
Dielectric Constant | 1 MHz | 9 | 28 | 9.6 |
Thermal Conductivity | W/m.K | 29 | 2.2 | 27 |
Max. Working Temperature | ℃ | 1,650 | 600 | 1,200 |
Resistance to Thermal Shock | △T(℃) | 230 | 260 | 750 |
Thermal Expansion Coefficient (25 - 1,000 ℃) | 10-6/K | 7 - 9 | 11 - 13 | 3 - 4 |
∆ The above data is offered for reference and comparison only, exact data will vary depending on manufacturing method and part configuration.
Finishing Processes
The ultra-fine processing method of ceramic precision balls includes the following steps: rough grinding, semi-finishing, finishing, processing stress release and super finishing, wherein the processing stress release step is after the rough grinding, semi-finishing and finishing steps , and before the super finishing step. The abrasive used in the rough grinding process is boron carbide or silicon carbide powder; the abrasive used in the semi-finishing process is selected from boron carbide, silicon carbide powder, corundum powder and alumina powder; the abrasive used in the finishing process is selected from several kinds of diamond powder, corundum, zirconium corundum and chromium corundum powder; the abrasive used in super finishing is diamond ointment and a kind of powder selected from tungsten carbide powder and corundum powder.
Hot Tags: precision ceramic balls, China, suppliers, manufacturers, factory, wholesale, price, for sale
Previous:
Zirconia Toughened Alumina
Next:
Aluminum Nitride Insert
Send Inquiry
