The general characteristics of alumina sheet are shown below:
| Small Dielectric Constant | Good Thermal Conductivity |
| Good Smoothness and Flatness | Excellent in Electrical Insulation |
| Low Thermal Expansion Coefficient | Good in Thermal Shock Resistance |
| Excellent Resistance Against Oil, Acid, Alkali | Various Specification in Stocks & Fast Delivery |
The following is the detailed description of alumina sheet:
High-Temperature Resistance
They can withstand temperatures ranging from 1500 to 1700°C. As a result, they are appropriate for use in high-temperature applications such as furnaces, kilns, and thermal insulation.
High Hardness
They possess a high degree of rigidity, hardness, and strength. They exhibit remarkable resistance to bending, compression, and abrasion, making them durable and long-lasting.
Electrical Insulation
They are ideal for applications calling for electrical insulation, such as insulators, circuit boards, and electronic components because they have excellent electrical insulating properties.
High Flatness and Dimensional Stability
Alumina sheets are featured by high flatness and dimensional stability, which are essential for preserving uniform heat distribution and guaranteeing proper contact with the heating elements. Their exact dimensions and smooth surface enable efficient heat transfer and enhance overall performance.
Excellent Mechanical Strength
They can support heavy loads and withstand mechanical stress thanks to their exceptional mechanical strength. They are able to withstand the weight of the materials placed on them without deforming or failing.
Smooth and Non-Porous Surface
Their smooth and non-porous surface prevents the possible accumulation of leftover impurities or materials during the heating process.
Thermal Stability
Alumina sheets can endure rapid temperature changes without cracking or warping due to their outstanding thermal stability. This characteristic is crucial in applications where the furnace needs to experience thermal cycling or temperature fluctuations.
Customization Options
There are many different sizes available, and the sheets can also be customized to fit particular needs in terms of size, thickness, and shape. The general thickness includes 0.25, 0.385, 0.5, 0.635, 1.0, 1.5, 2.0mm.
Low Price and Large Output
Their cost is low and the output is large. Among ceramic sheet materials, alumina sheets are the most commonly used and mature material.
Manufacturing Processes of Aluminum Oxide Plates
Aluminum oxide plate manufacturing is a complex process including numerous steps:
Powder Preparation
Usually, calcination of aluminum hydroxide or the Bayer technique of extracting alumina-rich ores yields high-purity aluminum oxide powder. Carefully milling the powder yields a high purity and a homogeneous distribution of particle sizes.
Forming & Shaping
A slurry or paste is created by combining the alumina powder with binders and additives. Then, by a variety of methods including dry pressing, isostatic pressing, or extrusion, this mixture is formed into green bodies. Though not quite dense, these green bodies hold their shape.
Sintering
In vacuum or regulated atmospheres, the sculpted green bodies sinter at high temperatures—above 1500°C. By bonding together during sintering, the alumina particles densify and a solid ceramic matrix with enhanced mechanical and thermal characteristics forms.
Alumina plates are carefully machined after sintering to get exact dimensions, flatness, and surface finishes by means of grinding, lapping, and diamond machining. For the plates' intended uses, this guarantees they satisfy exacting tolerances and surface quality standards.
Aluminum Oxide Plate Applications
Applications of aluminium oxide plates are many and span many industries:
Thermal stability and resistance to thermal shock make them useful as linings, setters, and supports in high-temperature furnaces and kilns.
Applied as substrates for integrated circuits (ICs), heat sinks, and insulating components in electronic devices where electrical insulation and thermal control are essential.
Chemical and Process Industries
Applied to corrosion-resistant and dependable chemical processing equipment including pumps, valves, and pipes.
Automotive and Aerospace
Used where extreme strength and durability are needed in engine components, ceramic bearings, and structural components in automotive and aerospace applications.
Medical and biotechnology
Used for their biocompatibility, wear resistance, and sterilization process tolerance in medical implants, prosthetics, and diagnostic equipment.
Used in spectroscopy equipment, analytical instruments, and research equipment for their dimensional stability, inertness, and dependability in scientific applications.
Progress and Possibilities for the Future
Advanced shape methods and nanomaterial integration are two recent developments in ceramic processing technology that keep increasing the uses and capacities of aluminum oxide plates. Enhancing characteristics including thermal conductivity, mechanical strength, and surface quality is the main goal of future study to satisfy changing industrial needs for improved performance and dependability.
