Material Characteristics:
High-purity alumina micro-powder is used as the raw material, with purity ranging from 95% to 99.9%. Through batching, forming, and densification sintering in a high-temperature air atmosphere furnace, high-performance alumina ceramic materials can be obtained, featuring density of 95%–99.9% or higher, uniform microstructure, and no free impurity residues. The material exhibits high hardness, high wear resistance, good electrical insulation, excellent high-temperature strength, and thermal shock resistance.
Product Information:
Alumina ceramic arc-shaped crucibles are made from high-purity alumina through isostatic pressing or slip casting and high-temperature sintering. They provide a clean, corrosion-resistant arc-shaped loading surface for powders and granular materials, preventing cross-contamination. The arc-shaped structure facilitates uniform material spreading, improves atmosphere flow around the material, and enables complete discharge. The crucibles possess high high-temperature strength and excellent thermal shock resistance. During long-term use, they do not crack, stick to materials, or precipitate impurities, reliably ensuring the purity of the fired materials.
Performance Parameters：
| 95% (Al₂O₃≥95%) | 99% (Al₂O₃≥99%) | 99.5% | 99.9% |
Density (g/cm³)： | 3.70–3.75 | 3.85–3.90 | 3.90–3.93 | 3.95–3.98 |
Flexural Strength (MPa)： | 250–350 | 300–400 | 350–450 | 400–550 |
Compressive Strength (MPa)：
| 2000–3000 | 2500–3500 | 2800–3800 | 3000–4000 |
Fracture Toughness (MPa·m¹/²) | 3–4 | 3.5–4.5 | 4–4.5 | 4–5 |
Mohs Hardness： | 8.5–9 | 9
| 9 | 9 |
Elastic Modulus (GPa)： | 300–350 | 350–380 | 370–390 | 380–400 |
Volume Resistivity (Ω·cm) @25°C： | >10¹⁴ | >10¹⁴ | >10¹⁵ | >10¹⁶ |
Maximum Operating Temperature (°C) (long term)： | 1400–1500 | 1550–1650 | 1650–1700 | 1700–1750 |
Dielectric Strength (kV/mm)： | 12–16 | 15–20 | 18–22 | 20–25 |
Thermal Conductivity (W/(m·K)) @25°C： | 20–25 | 28–32 | 30–35 | 35–40
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Product Dimensions:
Standard arc-shaped crucibles have lengths ranging from 100 mm to 500 mm, widths from 50 mm to 200 mm, depths from 10 mm to 80 mm, and wall thicknesses from 2 mm to 8 mm. Extra-long arc-shaped crucibles with a maximum length of up to 800 mm can be produced. The products come standard with an arc-shaped groove cross-section, and can be designed with arc bottoms, U-shaped bottoms, or parabolic bottoms as required. Further processing is available, including internal and external surface precision grinding, edge rounding, double-lug/single-lug hanging rim processing, positioning bosses, bottom slot milling, and multi-cavity arc-shaped crucibles. Yuko Corporation can also customize non-standard arc lengths, variable-curvature arc surfaces, lidded, holed, flanged, and combined arc-shaped crucible assemblies according to specific customer drawings and requirements.
Product Applications:
Alumina ceramic arc-shaped crucibles are widely used for the calcination and pre-sintering of electronic ceramic powders, pre-sintering treatment of magnetic materials, sintering and heat treatment of lithium battery cathode and anode materials, firing of phosphors and long-persistence phosphors, debinding and sintering of powder metallurgy metal powders, as well as high-temperature activation of catalysts and molecular sieves. They are specifically used as long-arc crucibles in tube furnaces, powder sintering boats in box furnaces, continuous firing carriers in pusher kilns and mesh belt kilns, and are also commonly used in laboratory high-temperature experiments requiring clean arc-shaped loading surfaces, such as ash content determination and sample ignition. They are ideal ceramic crucibles for ensuring high-purity, contamination-free processing of high-temperature powder materials.