
99% Ceramic Sheath
Description
Technical Parameters

Products Description
99% ceramic sheath is produced from high-purity alumina powder through specialized equipment molding, high-temperature sintering, high-pressure grinding and other processes. The alumina content is strictly controlled at 99% ± 0.2%, with ultra-high sintering density. It can operate stably for a long time at 1500 ℃ and will not deform or crack even under short-term high-temperature impact of 1700 ℃. Mainly used to separate temperature measuring components from the external environment, protecting the components from corrosion, oxidation, and damage in air, hydrogen, steam, inert gases, carbon monoxide, or vacuum environments. Ceramic insulators are specifically used to separate different electrodes of temperature measurement components to prevent electrode contact and short circuits, and ensure the accuracy of measurement results.
Parameter
|
Material |
Alumina |
Mullite |
Zirconia |
|||||
|
Properties |
Units |
AL997 |
AL995 |
AL99 |
AL95 |
AL60 |
|
ZrO₂ |
|
Ingredient |
|
99.70% |
99.50% |
99.00% |
95% |
60% |
|
|
|
Color |
|
Ivory |
Ivory |
Ivory |
White |
White |
|
White |
|
Permeability |
|
Gas-tight |
Gas-tight |
Gas-tight |
Gas-tight |
Gas-tight |
Gas-tight |
Gas-tight |
|
Density |
g/cm³ |
3.92 |
3.9 |
3.88 |
3.75 |
2.9 |
2.6 |
6.02 |
|
Hardness |
Mohs Scale |
9 |
9 |
9 |
8.8 |
7.5 |
8 |
8.5 |
|
Water Absorption |
|
≤0.2 |
≤0.2% |
≤0.2% |
≤0.2% |
≤0.2% |
0 |
0 |
|
Flexural Strength (Typical 20℃) |
Mpa |
375 |
370 |
340 |
304 |
205 |
120 |
1200 |
|
Compressive Strength (Typical 20℃) |
Mpa |
2300 |
2300 |
2210 |
1910 |
1820 |
500 |
5700 |
|
Coefficient of Thermal Expansion (25℃ to 800℃) |
106/℃ |
7.6 |
7.6 |
7.6 |
7.6 |
7.1 |
5.6 |
10 |
|
Dielectric Strength (5mm Thickness) |
AC-kv/mm |
10 |
10 |
10 |
10 |
9 |
10.2 |
|
|
Dielectric Loss 25℃@1MHz |
|
<0.0001 |
<0.0001 |
0.0006 |
0.0004 |
0.0007 |
0.002 |
0.001 |
|
Dielectric Constant 25°C1MHz |
|
9.8 |
9.7 |
9.5 |
9.2 |
8.6 |
6 |
29 |
|
Volume Resistivity (20℃) (300℃) |
2cm³ |
>1014 2*1012 |
>1014 2*1012 |
>10¹4 4*10¹1 |
>1014 2*1011 |
>10¹4 >1013 |
>1014 5*1012 |
>1013 5*10⁸ |
|
Long-term operating temperature |
℃ |
1700 |
1650 |
1600 |
1400 |
1200 |
1550 |
1600 |
|
Thermal Conductivity (25℃) |
W/m ·K |
35 |
35 |
34 |
20 |
16 |
3.6 |
3 |
Alumina Ceramic Sheath Size
Non-standard dimensions are fully customizable according to your equipment requirements;
Two structural types are available for all sizes: both ends open / one end closed.
|
ODxID (mm) |
LENGTH (mm) |
ODxID (mm) |
LENGTH (mm) |
|
6x4 |
≤1500 |
18x14 |
≤2500 |
|
8x5 |
≤2500 |
20x15 |
|
|
10×7 |
22x16 |
||
|
12×8 |
24x18 |
||
|
15x11 |
25x19 |
||
|
16x12 |
28x22 |
||
|
17×13 |
30×24 |
Production process and strict quality control
We focus on optimizing every detail of the alumina ceramic sheath based on customer usage needs and feedback. We conduct quality checks throughout the entire production process to ensure a final product qualification rate of 99.8%. At the same time, our products have significant competitive advantages in terms of performance and craftsmanship:
1. High purity raw materials: With 99%+high-grade alumina powder as the core raw material, each batch is subjected to component testing to ensure substrate purity. The high-purity raw materials and high standard sintering process ensure its high temperature resistance, corrosion resistance, and insulation performance, which can effectively extend the service life of equipment components.
2. Precision molding: Adopting a new molding process instead of traditional methods, the sheath has better straightness and uniform wall thickness, and can withstand high voltage of 20KV in practical applications, making it more stable and reliable to use.
3. High temperature sintering: precise temperature sintering is carried out in a high-temperature kiln, using a unique formula to optimize material texture, avoid high-temperature yielding, and improve overall performance.
4. High pressure grinding and polishing: Fine grinding and surface polishing are carried out on sintered semi-finished products to remove burrs, ensure smooth surface, and precise dimensional accuracy.
5. Flexible customization: Supports full customization of non-standard sizes and structural types (open at both ends/closed at one end), which can be customized according to your specific equipment parameters and usage needs to meet the personalized needs of different customers.
6. Comprehensive testing of finished products: Conduct performance tests such as airtightness, hardness, strength, insulation, and high temperature resistance; Only products that have passed all tests can be packaged and delivered.
All test data is recorded in detail, and we can provide complete factory test reports for each batch of products.
application
Our high-temperature ceramic sheath does not contain impurities such as unbound silicon and kaolin, has a small coefficient of thermal expansion, and strong thermal shock resistance. Therefore, it is widely used in various industrial high-temperature scenarios that require component protection:
1. Thermocouple protection: As the core protective sleeve of industrial thermocouples, it isolates the temperature measuring element from high-temperature molten metal, corrosive media, and mechanical wear, ensuring accurate and stable temperature measurement.
2. High temperature furnace equipment: used to protect the heating elements of electric furnaces and sintering furnaces, separate the heating components from the combustion materials, seal the high-temperature heating zone to improve heating efficiency.
3. Electronic and electrical equipment: As an insulation protection component for high-voltage and high-temperature electronic components, it avoids insulation failures caused by high temperature and external interference, and improves the safety of equipment operation.
Why choose our 99% alumina ceramic sheath?
We have been deeply engaged in the alumina ceramic product industry for many years, focusing on the research and development, production, and customization of ceramic sheaths and industrial ceramic components - we not only sell products, but also provide one-stop solutions for the protection of your industrial ceramic components. Our advantages:
Real parameters, no false markings: All product performance parameters are actual factory test values, consistent with the technical parameter table, with no false markings on purity, strength, and temperature resistance, and can be used with confidence.
Rich customization experience: We have extensive experience in non-standard customization of ceramic sheaths, which can quickly respond to your customization needs, provide professional drawing confirmation and scheme optimization, and have a low minimum order quantity, suitable for small and medium-sized batch customization.
Professional packaging, worry free transportation: In response to the brittleness of ceramic products, we adopt targeted packaging solutions based on product size and transportation methods, fundamentally avoiding transportation damage.
Thoughtful pre-sales and after-sales service: 24-hour online professional technical and customer service team, ready to answer your questions about product parameters, customization, and installation at any time; Provide free technical guidance to all customers and promptly resolve any usage issues.
FAQ
Q1: Can I apply for a free sample of 99% alumina ceramic sheath? What sizes are available for selection?
A1: Of course. We provide free standard size samples (optional inner diameter 3-10mm, outer diameter 5-12mm, length 100mm), and you only need to bear the international logistics shipping cost. If you need to customize small samples according to your device requirements, we can also make them for you and attach a sample testing report for you to test and confirm.
Q2: Can the size and shape of the sheath be customized?
A2: We can customize standard or non-standard sizes according to your drawings, with a maximum customizable length of 1500mm. We also support customization of special shapes, such as stepped and flanged sheaths, to meet your special installation needs.
Q3: How to package ceramic sheaths during transportation to prevent damage?
A3: We adopt a three-layer professional anti fall packaging solution: ① a single protective sheath wrapped in 3cm thick bubble film, with high hardness plastic anti-collision caps fixed at both ends to avoid collision damage; ② Put it into the customized foam tank, and there is no gap in the tank to prevent shaking and friction during transportation; ③ The outer layer is a thick wooden box.
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