Special Machining Ceramic Parts With Temperature Resistance And Anti Dirt
The manufacturing route for advanced ceramics include: consolidation of the powder, green machining of the compacted powder, sintering and finally, when required diamond grinding.
>>> Green Machining
This technique is commonly applied to as-pressed parts which are still in a chalky condition. Common metalworking machines are used to machine the part in this soft condition, as greater material removal rates are possible than by post-sintering operations such as diamond grinding. As-fired green machined components are subject to tolerances of approximately +/- 1%. To achieve tighter tolerances, diamond grinding must be employed.
The compacted and machined components are fired or “sintered” at temperatures approaching 1800C°. During this operation, the powder particles bond together and component shrinks by 15%-35%.
>>> Diamond Grinding
Following sintering, the ceramic (now in its ultra-hard state) is machined using diamond grinding techniques which, together with lapping and polishing, enable tight tolerances and smooth surface finishes to be achieved. However, diamond grinding is relatively expensive, so if as-fired tolerances are acceptable, the overall cost of the component is reduced.
Aluminium Oxide Ceramics
Aluminum Oxide, also known as alumina, is a hard wearing advanced technical ceramic material frequently used in a wide variety of industrial applications. Once fired and sintered, it can only be machined using diamond-grinding methods. It features high hardness and wear resistance, low erosion levels, high temp. resistance, corrosion resistance, and bioinertness. Additionally, it can be highly polished, making it useful for a wide range of applications. Frequently used alumina's purity is from 90% to 99.7%.
Main Properties of Alumium Oxide Ceramics
||92 - 96
||99 - 99.7
||18 - 25
||30 - 35
|Thermal Shock Resistance
|Max. Working Temp.
Industrial Ceramic Intriduction
Aluminium Oxide, Al2O3 is the most widely applied and cost effective technical ceramic material. It offers a combination of superior mechanical strength and electrical properties, wear resistance and corrosion resistance. The maximum working temperature is up to 1700 °C with relatively high thermal conductivity. It is also an electrically insulating material with a high electrical resistivity. The good corrosion resistance makes it insoluble in water and slightly soluble in strong acid and alkaline solution.
Mingrui ceramic manufacture and provides alumina ceramic components for a wide range of application like Mechanical Equipment, Electronic & Electrical, Oil Drilling, Medical, Chemical Industry etc. According to actual application and customer's requirement, the purities vary from 95%-99.7% and the forming methods will be different. The forming methods applied in our plant include dry pressing, isostatic pressing, injection moulding, extrusion moulding. With experienced engineers and talented workers, we are confident to offer high quality, high precision, complex components for customers worldwide.