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Machinable glass ceramics, commonly known as Macor ceramics, are a multifunctional material that combines the features of glass and ceramics. They are are polycrystalline composites with exceptional machinability that can be processed into elaborate geometries, intricate patterns, and precise dimensions. They are superior electrical insulators and have low thermal expansion coefficient, good thermal stability, high breakdown strength, and low dielectric loss. Additionally, they can withstand harsh chemical environments thanks to their high corrosion resistance. They are resistant to ageing and have a long service life.
Machinable glass ceramics (Macor ceramics) are mostly comprised of a mixture of glass and ceramic powder, which are fluorphlogopite glass-ceramics with synthetic mica as the main crystal phase. They are composed of fluorphlogopite (Mg3K[AlF2O(SiO3)3]), and glass that mainly consists of silica. The following are the benefits of machinable glass ceramics.
Machinability
Excellent machinability is one of the key benefits of machinable glass ceramics. It can be easily processed using standard processing methods like milling, drilling, grinding and turning, and intricate geometrical shapes, complicated patterns, and accurate dimensions, such as varied ceramic thin walls, ceramic threads, etc., and also be processed without the need for opening the mold. There is a significant reduction in the design and processing cycle, and no specialized tools or equipment are needed.
Thermal Stability
Machinable glass ceramics provide great thermal stability. They have a low coefficient of thermal expansion, therefore can endure fast temperature fluctuations from minus 200 degrees to 800 degrees without breaking or cracking. As a result, they are frequently used in welding fixtures and molding molds for optical glass.
Electrical Insulation
Machinable glass ceramics offer superior electrical insulation properties (electric breakdown up to 40KV/A per mm), high resistance, and low dielectric loss, making them appropriate for electrical insulation-required applications. For example, they can be used as electrical insulators in electrical systems, connectors, and components, etc.
Corrosion Resistance
Because of their outstanding chemical resistance, machinable glass ceramics can withstand environments containing a variety of chemicals and corrosive substances. They are resistant to most solvents, acids, and alkalis, which makes them used in various chemical equipment. They are more corrosion-resistant, not aging, and have a long service life when compared to PTFE .
Low Vacuum Outgassing Rate
Machinable glass ceramics have exceptionally low vacuum outgassing rate (thus they are extensively employed in various vacuum equipment, photovoltaic vacuum coating equipment, and so forth). On the other hand, they also possess outstanding electromagnetic performance, having been used on a large scale as various coil skeletons.
UNIPRETEC can provide you with various specifications of Macor bars, plates, blocks, etc. In stock. You can directly purchase the blank materials and process them into needed ceramic parts using existing equipment like metal processing. Additionally, UNIPRETEC offer processing services according to the drawings provided. Our company is equipped with a number of CNC lathes, surface grinders, and machining centers, and the delivery cycle is short.
The available machinable ceramic rods have the following specifications:
| Diameter(mm) | Length(mm) | Diameter(mm) | Length(mm) | |
| 10 | 100/150/300 | 70 | 100/150/300 | |
| 15 | 75 | |||
| 20 | 150/300 | 80 | 100 | |
| 25 | 85 | |||
| 30 | 90 | |||
| 35 | 95 | |||
| 40 | 100 | |||
| 45 | 105 | |||
| 50 | 110 | |||
| 55 | 115 | |||
| 60 | 100/150/300 | 120 | ||
| 65 | - | - |
Because of their superior machinability, vacuum property, electrical insulation, thermal shock resistance, and chemical corrosion resistance, machinable ceramics are widely employed in a wide range of industries and applications.
Insulating Parts
Because of their machinability, machinable ceramics can be made into a range of structural ceramic parts with complex structures, including insulating pads, heat insulating pads, insulating supports, and heat-resistant supports for different mechanical equipment.
Key Parts of Lightning Rod
Machinable glass ceramics offer exceptional high-temperature electrical insulating properties and can be employed in a variety of electrical equipment like lightning rod essential parts.
Welding Fixtures and Optical Glass Overmolding Molds
Machinable glass ceramics can be used in temperatures between -200°C and +800°C. Due to the elasticity of the mica crystals in glass-ceramics, they can prevent the extension of microcracks, resulting in excellent thermal shock resistance. For hermetic bonding, their low coefficient of thermal expansion guarantees dimensionally stable workpieces. Their common applications include welding fixtures and optical glass overmolding molds.
Vacuum Equipment Supports
After baking at 180°C for 1 hour, holding at 160°C for 1 hour, and vacuum ageing for 8 hours, the machinable ceramics offer exceptionally low outgassing rate of only 8.8x10-9 ml/s. cm2, making them widely employed as supports in vacuum chambers of various vacuum equipment, such as vacuum equipment supports, photovoltaic industry vacuum coating supports.
Chemical Industry Components
Machinable glass ceramics have good corrosion resistance. Since they are entirely made of inorganic materials, they also possess properties of never ages or deforms, are extremely stable to a wide range of organic solvents, and excellent resistance to acid and alkali corrosion. As a result, they are utilized in the chemical industry as varying essential components, such as the electrode introduction rod for crude oil desalting, hanging.
Missile Gyroscope Coil Skeletons
Machinable glass ceramics can be made into coil skeletons of missile gyroscopes because they have outstanding electromagnetic characteristics.
Rotary Vacuum Pump Vanes
When there are no metal particles present, machinable glass ceramics behave like graphite and are exceptionally self-lubricating. They are lighter than aluminium, have a specific gravity that is just one-third that of ordinary steel, and possess a very low water absorption rate. As a result, they are typically used as rotary vacuum pump vanes
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>>> It’s composed of a combination of glass and ceramics. It offers the benefits of both glass and ceramics, such as high-temperature resistance and electrical insulating properties, while also being relatively easy to machine into various shapes.
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Excellent electrical insulator.
High-temperature resistance (up to 800°C or 1472°F).
Low thermal expansion.
Machinable with conventional metalworking tools.
Low outgassing and vacuum compatibility.
Good chemical resistance to many acids, bases, and organic solvents.
>>> It can be machined using standard metalworking tools such as drills, mills, and lathes. It can also be ground, polished, and threaded. This machinability makes it a versatile material for creating complex and customized components.
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While Macor has many advantages, it also has some limitations:
It is brittle and can break if subjected to mechanical stress.
Macor is not as strong as some other ceramics like alumina or zirconia.
It may not be suitable for applications requiring extreme hardness or wear resistance.
>>> Yes, it is often used in vacuum systems due to its low outgassing properties and resistance to vacuum conditions. It does not release significant amounts of gas or impurities when exposed to vacuum, making it a suitable choice for vacuum applications.
>>> Machinable glass ceramic is relatively more expensive compared to some other ceramics, but its machinability and unique combination of properties make it cost-effective in certain applications where customization and precision are essential.
>>> Yes, we have rods, bars and sheets with various sizes in stock. Custom sizes are also available with fast delivery date within 7 days.
Alumina (Al2O3)
Alumium Niride (AlN)
Boron Nitride (Hex BN)
Machinable Glass Ceramic
Silicon Nitride (Si3N4)
Zirconia (ZrO2)
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