Alumina Crucible
Advantages of alumina crucible
An alumina crucible crafted from alumina (aluminum oxide), these crucibles offer exceptional thermal resistance, chemical inertness, and mechanical strength, making them indispensable tools in experimental setups demanding extreme conditions.
1. High Thermal Stability: Alumina crucibles excel in maintaining structural integrity at elevated temperatures, withstanding heat up to 1600°C or higher depending on specific grades and formulations.
2. Chemical Inertness: Resistant to most acids, bases, and solvents, alumina crucibles provide a non-reactive environment essential for handling reactive substances and conducting precise chemical reactions.
3. Mechanical Durability: With superior mechanical properties, including high hardness and abrasion resistance, alumina crucibles exhibit remarkable resilience to physical stress, ensuring longevity and reliability in laboratory operations.
4. Uniform Heating: Their excellent thermal conductivity promotes uniform heating distribution, essential for consistent experimental results and minimizing temperature differentials within the crucible.
5. Versatility: Alumina crucibles find applications in diverse scientific endeavors, including but not limited to melting, calcination, sintering, and thermal analysis of a wide range of materials such as metals, ceramics, and compounds.
6. Easy Handling: Available in various sizes and configurations, alumina crucibles are easy to handle, clean, and maintain, offering convenience and flexibility in experimental setups.
7. Compatibility: Compatible with most heating sources, including gas burners, muffle furnaces, and electrical resistance furnaces, alumina crucibles adapt to different laboratory setups and procedures with ease.
Applications of alumina crucible
1. Chemical Synthesis: Alumina crucible used for synthesis, purification, and crystallization of chemical compounds.
2. Metallurgical Processes: Alumina crucial in metallurgical analysis, alloy preparation, and metal casting.
3. Materials Research: Alumina crucible employed in the fabrication and characterization of ceramics, glasses, and advanced materials.
4. Thermal Analysis: Alumina crucible used for facilitate thermogravimetric analysis (TGA), differential thermal analysis (DTA), and differential scanning calorimetry (DSC) experiments.
5. Research and Development: Alumina crucible used for integral to research endeavors across various scientific disciplines, including pharmaceuticals, nanotechnology, and environmental science.
Characteristics of alumina crucibles
1. Alumina crucibles have good heat and cold resistance and are not prone to explosion.
2. The alumina crucible is formed by casting, with high density.
3. Alumina crucibles have good high-temperature insulation and mechanical strength in oxidizing and reducing atmospheres.
4. Alumina crucibles have high thermal conductivity and low thermal expansion rate.
Alumina ceramic performance index (Notice of Correct in Leakeage Rate）
NO. | Property | Unit | Alumina |
1 | Al2O3 |
| >99.3 |
2 | SiO2 |
| — |
3 | Density | g/cm3 | 3.88 |
4 | Water absorption |
| 0.01 |
5 | Compressive strength | MPa | 2300 |
6 | 20℃ leakage rates | Torr・L/sec | >10-11=1.33322×10-12Pa・m3/sec |
7 | Twisting in high temperature | mm | 0.2 allowed in 1600℃ |
8 | Bonding in high temperature | not bonded in 1600℃ | |
9 |
20—1000℃ coefficient of thermal expansion |
mm.10-6 ／℃.m |
8.2 |
10 | Thermal conductivity | W/m.k | 25 |
11 | Electric insulation strength | KV/mm | 20 |
12 |
20℃direct current insulation resistance |
Ohm/cm |
1014 |
13 |
High-temperature insulation resistance | 1000℃ MΩ | ≥0.08 |
1300℃ MΩ | ≥0.02 | ||
14 | Thermal shock resistance | 4 times not cracked in 1550℃ | |
15 | Maximum working temperature | ℃ | 1800 |
16 | Hardness | Mohs | 9 |
17 | Flexural strength | Mpa | 350 |
The difference between alumina crucibles and evaporating vessels
Many people are not familiar with the difference between alumina crucibles and evaporating vessels. Although there are many similarities between the two in use, there are still significant differences in actual use.
1. Different uses
Alumina crucibles can heat non aqueous substances, such as melting non corrosive salts, igniting precipitates, carbonizing or ashing certain complex specimens, etc; Evaporating dishes are generally used to evaporate solutions.
2. Different materials
The material of alumina crucibles must be resistant to high temperatures, and the upper temperature limit for ceramic crucibles is about 800 degrees Celsius; Aluminum oxide ceramic crucibles can be used at high temperatures above 1000 degrees Celsius, while evaporating vessels are usually made of ordinary glass or ceramics, and should be used at temperatures below 400 degrees Celsius.
3. Different heating methods
The alumina crucible can be directly heated or placed in a high-temperature heating furnace for heating; Ceramic evaporating dishes can also be heated directly with an open flame, while glass evaporating dishes usually need to be padded with asbestos mesh to be heated.
4. Due to the fact that crucibles are commonly used instruments in thermogravimetric analysis and have very precise quality requirements, it is generally necessary to use waste crucible pliers when using crucibles; The evaporating dish is usually taken by hand, and a glass rod or spoon can be used to transfer reagents.
The main purpose of alumina crucibles is to burn and precipitate, which can be used for high-temperature treatment of samples, such as ashing, charcoal burning, etc. The alumina crucible can withstand high temperatures of 1500 degrees Celsius. Ceramic evaporating dishes are mainly used for evaporating and concentrating liquids. When not subjected to quantitative analysis, they can also be used for drying solids, ashing filter paper, and high-temperature calcination (below 500 degrees Celsius).
FAQ
A1.Crucibles are used in chemistry laboratories as containers for extremely hot chemical compounds and are made from materials with high-temperature resistance. The ceramic form of alumina is commonly used because of its low cost, strength, and ability to withstand temperatures as high as 3272°F (1800°C).
A2.Alumina crucibles have longer life span compared to clay graphite crucibles, and provide advantage especially for continuous working systems.
A3.Yes.We accept customized alumina crucibles based on drawings.
Our factory
Jinzhou Yunxing Industrial Ceramics Co., Ltd. was established in 2000, mainly producing various types of tubular ceramic products and various industrial parts with alumina content above 99.3%. The factory covers an area of 4000 square meters.
The company's main products are: alumina ceramic tubes, alumina ceramic crucibles, alumina ceramic rods, alumina ceramic boats, alumina ceramic plates, alumina ceramic parts, etc.
The company currently has 3 1800 ° C high-temperature furnaces and 2 1400 ° C low-temperature kilns independently designed and manufactured. The molding process is mainly based on grouting molding, and has other molding process equipment such as extrusion and hot die casting.
The company has 105 employees, including one senior ceramic engineer, three engineers, six overseas sales staff, and four professional after-sales staff.
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