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Alumina ceramic plates are defined by factors such as alumina content (90–99.5%), high hardness, compressive strength, and thermal stability up to 1700°C. These technical parameters determine suitability for harsh industrial processes and help prevent functional failures from misselection. Understanding these specs ensures optimal performance and reliability.
What Is the Typical Alumina Content in Industrial Ceramic Plates?
Most alumina ceramic plates used in industrial applications contain between 90% to 99.5% alumina (Al2O3). This high-purity range enhances chemical inertness and facilitates use in high-temperature or corrosive settings. As explained by global ceramic materials standards, the selection of alumina content balances cost efficiency with required performance.
| Alumina Grade | Alumina Content (%) | Typical Application |
|---|---|---|
| Standard Alumina Ceramic | 90–95 | General wear resistance, bulk components |
| High-Purity Alumina | 96–99.5 | Precision parts, high-corrosion, electrical insulation |
Data Source: "Global Advanced Ceramics Market Size & Share Report, 2024", Grand View Research, Jan 2024.
- Higher alumina content improves mechanical and thermal performance.
- Purity above 96% is preferred for applications demanding electrical insulation or chemical inertness.
- Selection of grade should align with operating environment and desired longevity.
How Does Hardness Affect the Performance of Alumina Ceramic Plates?
Industrial alumina ceramic plates typically exhibit a Mohs hardness close to 9, making them second only to diamond and a few other advanced materials. This property is essential for maintaining surface integrity in applications exposed to mechanical wear, particle impact, or recurrent contact stress. Market analyses confirm that increased hardness extends lifespan and reduces overall maintenance costs.
| Property | Typical Value | Description |
|---|---|---|
| Mohs Hardness | 9 (High) | Excellent scratch and abrasion resistance |
| Compressive Strength | 2,000–2,500 MPa (High) | Withstands heavy mechanical loads |
Data Source: "Ceramic Materials Mechanical Properties Datasheet", AZoM, Jan 2024.
- Higher Mohs hardness reduces abrasive wear.
- Compressive strength is vital for structural stability in high-load setups.
- Suitable for severe wear and contact-intensive environments.
What Are the Thermal Limits of Alumina Ceramic Plates?
The operational temperature range for high-purity alumina ceramic plates typically extends up to 1700°C, exceeding the limits of most conventional metals and glass ceramics. Thermal conductivity and minimal expansion ensure dimensional reliability in cycling thermal environments. Industry guidelines emphasize specifying maximum use temperature based on both the alumina grade and atmospheric conditions.
| Parameter | Typical Value | Notes |
|---|---|---|
| Maximum Use Temperature | Up to 1700°C | Based on 99.5% alumina in air, slightly lower in reducing atmospheres |
| Thermal Conductivity | 25–35 W/m·K | Ensures effective heat dissipation |
| Thermal Expansion Coefficient | 7–8 x10-6/K | Low expansion for dimensional stability |
Data Source: "Alumina as a Ceramic Material for High Temperature Applications," Industrial Heating Magazine, Feb 2024.
- Maximum use temperature directly correlates with alumina purity and process atmosphere.
- Stable thermal expansion minimizes risk of thermal shock and warping.
- Effective for kiln linings, thermal shields, and heat exchangers.
What Dimensional Tolerances Are Standard for Alumina Ceramic Plates?
For most industrial alumina ceramic plates, standard dimensional tolerances typically range from ±0.1 mm for general components to as tight as ±0.02 mm for precision-machined plates. Compliance with international standards (such as ISO 1302 and ISO 2768) is commonly required, especially for complex assemblies.
| Component Type | Typical Tolerance | Notes |
|---|---|---|
| Standard Plates | ±0.10 mm | For wear parts, insulation boards |
| Precision-Machined Plates | ±0.02 mm | Critical for automation, optical, or sensor applications |
Data Source: "Dimensional Tolerances for Advanced Ceramics", Ceramic Industry Magazine, Mar 2024.
- Tighter tolerances are available through post-sintering grinding or machining.
- Consistency in flatness and parallelism is crucial in multi-plate assemblies.
- Always specify required tolerances and inspection standards when sourcing plates.
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