Specifically, it is known as アルミナセラミック, which is derived from aluminum oxide, Al2O3. It is regarded as one of the numerous aluminous materials that have many uses in engineering and industry. It has advanced characteristics; for example, it is hard, more wear-resistant, and has good high-temperature stability. Such properties make such ceramics useful in electronics, engineering components and devices, and medical uses.
Different Grades of Alumina
アルミナセラミックス are available in diverse purities that can be useful in different areas due to the distinct characteristics associated with each. The 94% alumina grade has more or less acceptable strength and durability factors for having less density. The 96% alumina grade has enhanced mechanical strength and slightly higher density than the 94% alumina grade. In cases where higher wear resistance and thermal stability are desirable, 95% alumina can be a more rounded solution often used because of its relatively affordable price and the overall improvements in the material’s properties.
However, different grades of alumina ceramics are available to meet specific performance requirements and applications, and it is important to understand their unique characteristics.
The table below can help you quickly understand the different grades of alumina.
|
Common Alumina Purity Grades |
|
|
Low to medium purity（Low cost and suitable for general applications） |
Common Uses |
|
88-90% |
Grinding balls, wear-resistant accessories |
|
92% |
Electrical packaging, bushings, grinding media |
|
94-95% |
Metallization, pressure sensors, X-ray components |
|
Medium to high grade (good performance, general industrial use) |
Common Uses |
|
96% |
Medical equipment, wear-resistant nozzles, connector housings |
|
97-98% |
Vacuum systems, lasers, X-ray equipment |
|
High purity grade (excellent performance, high temperature resistance, strong corrosion resistance, used in key areas) |
Common Uses |
|
99% |
Pumps, bearings, seals, semiconductor equipment components |
|
99.5% |
Semiconductor application components, medical, vacuum systems |
|
99.6-99.7% |
Semiconductor application components, laser reflectors |
|
99.8-99.9% |
Plasma etching, medical vacuum components, high voltage insulation |
|
Very high purity (scientific research grade, cutting-edge applications) |
Common Uses |
|
99.95%-99.96% |
High-voltage micro-components, scientific research, semiconductor high-demand environment |
94-95% Alumina Ceramic
This grade comprises about 94%-95% aluminum oxide, while the rest is additives and impurities. It is an entry-level option with a good compromise between performance and cost. For this reason, this material is appropriate where the radical properties of higher-grade alumina ceramics are not in demand.
Though relatively low, the alumina content here is good for wear resistance and mechanical strength, and hence, it finds quite extensive application in most general industrial uses.
96% Alumina Ceramic
This kind contains approximately 96% Alumina, exhibiting improved mechanical characteristics over the 94% alumina variety. Due to the increased alumina content, the wear resistance and tolerance against temperature fluctuation are increased. Hence, this material can be used in places where strict conditions are available.
Due to its balanced performance-to-cost ratio, this material has found a place in various applications that require performance enhancement at a moderate level.
98% Alumina Ceramic
This grade’s major constituents contain about 98% aluminum oxide, which possesses increasing hardness and thermal stability. It is used for applications that require higher purity and performance than the 96% grade. It remains the perfect component in conditions where extreme wear and temperature prevail.
99% Alumina Ceramic
The 99% alumina ceramic grade has excellent mechanical strength and superb thermal and chemical resistance. It contains 99% aluminum oxide, which increases its purity for such an extended and exacting environment. This grade has been preferred by industries, especially high-technology ones, due to its superior and consistent performance.
99.5% Alumina Ceramic
With 99.5% alumina content, this grade supplies a much higher degree of purity and thus ensures superior performance at elevated temperatures. It is recommended for applications requiring minimal contamination, such as medical and scientific applications.
With a purity of up to 99.5%, alumina ceramic is perfect for tight conditions and sophisticated for various uses, as seen below. It is widely used in analytical instruments, laboratories, and high-vacuum systems, where even the smallest amounts of impurities may significantly affect the equipment’s efficacy and perhaps the results.
Moreover, its increased purity further enhances its mechanical properties and resistance to chemical attack, making it ideal for precision parts.
99.8% Alumina Ceramic
This is one of the very high-purity grades. It contains 99.8% aluminum oxide. It is made for those highly demanding applications that require maximum resistance to temperature, chemistry, and mechanics. Its almost faultless composition minimizes impurities and is suitable for use in high-tech, high-stress applications where reliability is imperative.
99.9% Alumina Ceramic
99.9% Alumina ceramic is a high purity grade that provides excellent performance for use in a variety of critical applications.This grade of alumina material is suitable for specialized precision applications where even slight impurities can affect performance, 99.9% has very few impurities, which gives it excellent performance, essential for modern research and technological development.
99.95%-99.96% Alumina Ceramic
99.95-99.96% alumina ceramics are already top commercial purity. Compared with other purities, it has extreme mechanical strength and dielectric properties, and is often used in various scientific research and cutting-edge applications, such as extremely high-demand semiconductor applications. The only drawback is that it is very expensive.
Chapter Summary
Proper selection of appropriate alumina grades upgrades the efficiency, durability, and reliability of industrial products’ major lifts, assuring the highest levels of performance and safety.
Therefore, the selection of grade will depend upon application specifics, such as mechanical strength, thermal stability, chemical resistance, and cost. From the most prosaic industrial components to the most up-to-date scientific research, the wide diversity of grades in alumina ceramics provides a solution that will meet the diversified needs of modern engineering and technology.
By carefully selecting the right grade of alumina, such industries have been in a position to improve their efficiency and durability: reliability that meets the highest standards of performance and safety in their products.
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結論
Alumina ceramics come in a variety of purity grades, each with different properties and completely different uses. From 94% alumina for general industrial applications to the most demanding 99.96% alumina, understanding these grades can help you choose the best material for your industry, thereby optimizing performance and cost.