Overview of Alumina Crucible

Alumina crucibles are high-temperature vessels made mostly of light weight aluminum oxide. They are available in numerous pureness degrees, frequently over 95%. These crucibles supply great thermal stability, high melting points, and strong resistance to chemical deterioration. They're utilized in metallurgy for melting metals, in laboratories for high-temperature experiments, and in porcelains for sintering. They're durable yet can be weak and might face thermal shock concerns otherwise used effectively.

(Alumina crucibles)

Features of Alumina Crucible

To start with, they have exceptional thermal stability with a high melting point of over 2000 ° C and they can keep their structural security in incredibly warm setups . This makes them suitable for treatments like melting metals and accomplishing high-temperature domino effects.
Secondly, their chemical inertness is impressive. They stand up to deterioration from numerous acids, antacids, and molten salts, making certain that the materials being refined stay pure and without contamination.
In terms of mechanical residential or commercial properties, alumina crucibles are rather strong. They can withstand mechanical stress and anxiety during handling and procedure, decreasing the danger of breakage.
Moreover, they have fairly low porosity good for their chemical resistance. It also helps stop the infiltration of liquified products.
Finally, they have a low thermal growth coefficient. This implies they can sustain rapid temperature modifications without breaking quickly, though care should still be taken.

Parameter table of Alumina Crucible

Parameter	Description
Chemical Composition	- Mainly composed of aluminum oxide (\(Al_2O_3\)), with purities commonly available as 95%, 99%, 99.5%, and 99.9%. - Minor impurities may include silica (\(SiO_2\)), iron oxide (\(Fe_2O_3\)), titanium dioxide (\(TiO_2\)), etc.
Density	- For 95% alumina crucibles: around 3.6 - 3.7 g/cm³. - For 99% alumina crucibles: approximately 3.8 - 3.9 g/cm³. - Higher - purity alumina crucibles generally have higher densities.
Thermal Conductivity	- At room temperature, it is typically in the range of 20 - 30 W/(m·K). - Thermal conductivity decreases as the temperature rises.
Linear Expansion Coefficient	- Around \((6 - 8)×10^{-6}/^{\circ}C\) in the temperature range of 20 - 1000°C. - This relatively low coefficient helps in withstanding thermal shock to some degree.
Refractoriness	- 95% alumina crucibles can withstand temperatures up to about 1750 - 1800°C. - 99% and higher - purity alumina crucibles can handle temperatures above 2000°C.
Compressive Strength	- Usually in the range of 200 - 500 MPa. - Higher - purity and well - sintered crucibles tend to have higher compressive strengths.
Flexural Strength	- Typically 30 - 100 MPa. - This strength indicates the ability to resist bending forces.
Porosity	- Low porosity, generally less than 5%. - Lower porosity contributes to better chemical resistance and mechanical performance.

Applications of Alumina Crucible

Alumina crucibles are used in many industries. In the metallurgy industry, they are very important for melting and refining metals. They can handle non - ferrous metals such as aluminum, copper, and their alloys. They are also used for precious metals like gold and silver. The crucibles keep the molten metals pure and stop them from getting contaminated by the crucible material.

In laboratories, scientists use alumina crucibles a lot. They use them for high - temperature experiments. For example, they use them to find out the ash content in samples. They also use them for calcining chemical compounds and doing thermal analysis. The crucibles are chemically stable. So, the substances being tested don't react with the crucible walls. This gives accurate and reliable results.

The ceramics industry depends on alumina crucibles too. When ceramic materials are sintered, these crucibles create a stable high - temperature environment. They help make ceramic powders denser. This improves the mechanical and physical properties of the final ceramic products.

In the electronics industry, alumina crucibles are used in making semiconductor materials. They are good for processes like crystal growth. In crystal growth, a clean and high - temperature - resistant container is needed to make sure the semiconductor crystals are of good quality. Also, they are used in making electronic components that need to be processed at high temperatures.

Production Method of Alumina Crucible

1. To create alumina crucibles, mix high-purity alumina powder with binders and ingredients first.
2. Shape the mix into crucible kinds by pressing or casting.
3. Completely dry the environment-friendly crucibles to eliminate wetness.
4. Sinter them at over 1600 ° C to reinforce and densify the product, leading to a functional alumina crucible.

Company Introduction

Welcome to Teen-Hot,a leading global supplier of high-quality crucibles designed for various industrial applications. We offer an extensive range of crucibles, including graphite, ceramic, and metal varieties, tailored to meet the needs of foundries, laboratories, and manufacturers. Our products are renowned for their durability, thermal resistance, and precision engineering, ensuring optimal performance in melting and heat treatment processes. With advanced manufacturing facilities and a commitment to excellence, we provide reliable, cost-effective solutions worldwide. Partner with us for your crucible needs and experience superior quality, expert support, and timely delivery.

If you have any questions, please feel free to contact us(nanotrun@yahoo.com).

Storage Condition of Alumina Crucible

Alumina crucibles need to be stored in a dry location, because moisture can lead to surface corrosion and impact their performance. Keep them away from strong mechanical shocks to prevent cracking. They also should be placed in a clean environment. Dust or impurities on the crucible surface might contaminate substances during high - temp use, thus reducing the crucibles' effectiveness.

Payment Methods

T/T, Western Union, Paypal, Credit Card etc.

Shipment Methods

By air, by sea, by express, as customers request.

5 FAQs of Alumina Crucible

1. What's the highest temperature an alumina crucible can endure?

Alumina crucibles can withstand temperatures ranging from 1750 - 2000°C or even higher, depending on their purity. Higher - purity crucibles can typically handle more extreme heat.

2. Can alumina crucibles be used for melting any metal?

They are great for non - ferrous metals like aluminum, copper, and precious metals. But for some high - melting - point metals, other types of crucibles might be more suitable.

3. How do I clean an alumina crucible after use?

Let it cool first. Then, you can clean it with water and a soft brush. For stubborn residues, a mild acid or base solution can be used, but make sure to rinse thoroughly afterward.

4. Do alumina crucibles react with chemicals during experiments?

Thanks to their chemical stability, they rarely react with most substances being tested. However, extremely reactive chemicals might cause issues.

5. How long do alumina crucibles last?

With proper use and storage, they can last for a long time. But if they're used frequently at high temperatures or mishandled, their lifespan will be shorter. Look for signs of cracks or wear to know when it's time to replace.