| Application: | Electronics |
|---|---|
| Grain Size: | 1-10um |
| Purity: | 99.8% |
| Type: | Ceramic Part |
| Characteristic: | Insulation, Wear-Resistant |
| Proofing Cycle: | 20-30 Days |
| Customization: |
|---|
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| Properties of SILICON NITRIDE CERAMICS | |||
| Name | Silicon nitride | ||
| Composition | Si3N4 | ||
| Materia Choperties |
Density | g/cm3 | 3.26 |
| Relative density% | % | >99.8 | |
| Water Absorption | % | 0 | |
| Sintering Temperature | ºC | 1,700 | |
| Machanical Properties |
Hardness | HV | 1600~1800 |
| Flexural Strength | Mpa | 800~1000 | |
| Young' s Modulus | GPa | 300~320 | |
| Rupture Tenacity | Mpa.m1/2 | 7~8 | |
| Thermal Properties |
Maximum Use Temperature | ºC | 1100 |
| Thermal Expansion | K-1 | 3.2×10-6 | |
| Poisson' s ration | T(ºC) | 0.26 | |
| Thermal Conductivity | W/m.k (25ºC-300ºC) |
18 | |
| Iectrical Properrties |
Specific resistance ratio | >1018 | |
| Dielectric Strength | KV/mm | ||
| Dielectric Constant (100 Mhz) |
(E) | ||
| Dielectric Dissipateic Dissipation Factor |
(tgδ) | ||
1. What is a silicon nitride ceramic ring used in steel mill rail rollers?
Silicon nitride (SiN) ceramic ring is a high-performance component used in steel mill rail rollers. These rings are known for their exceptional hardness, thermal stability, and resistance to wear and corrosion, making them ideal for the demanding conditions in steel mills.
2. What are the key properties of silicon nitride ceramic rings?
Silicon nitride ceramic rings possess several important properties, including:
·High hardness and mechanical strength
·Excellent thermal shock resistance
·Low thermal expansion
·Superior wear resistance
·High corrosion resistance
·Low density (lighter than steel)
3. What applications are silicon nitride ceramic rings used for in steel mills?
Silicon nitride ceramic rings are used in various applications within steel mills, including:
·Rail roller bearings
·Guide rollers
·Support rollers
·Components in continuous casting machines
·Other high-temperature and high-wear applications
4. How are silicon nitride ceramic rings manufactured?
The manufacturing process of silicon nitride ceramic rings typically involves:
·Powder preparation: High-purity silicon nitride powder is mixed with sintering aids and binders.
·Forming: The mixture is shaped into ring forms using methods such as isostatic pressing or injection molding.
·Sintering: The shaped rings are heated at high temperatures under controlled atmospheres to densify the material and enhance its properties.
·Finishing: The sintered rings may undergo additional processes like grinding or polishing to achieve precise dimensions and surface finish.
5. What are the advantages of using silicon nitride ceramic rings in steel mills?
The advantages include:
·High durability and longevity, reducing maintenance and downtime·
·Excellent performance at high temperatures
·Superior resistance to wear and abrasion, extending the lifespan of the rollers
·High corrosion resistance, maintaining performance in harsh environments
·Low density, contributing to reduced overall weight and inertia in moving parts
6. Are there different grades of silicon nitride ceramic rings?
Yes, silicon nitride ceramic rings are available in different grades based on the specific composition and manufacturing process. The choice of grade depends on the specific application requirements, such as mechanical strength, thermal conductivity, and cost considerations.
7. How do I select the right silicon nitride ceramic ring for my application?
Selection criteria should include:
·Operating temperature and thermal shock resistance
·Mechanical strength and load-bearing requirements
·Wear and abrasion resistance needs
·Chemical and corrosion resistance requirements
·Dimensional and tolerance specifications
·Cost considerations
8. Can silicon nitride ceramic rings be customized?
Yes, silicon nitride ceramic rings can be customized in terms of size, shape, and surface finish to meet specific application requirements. Customization may also include specific treatments to enhance particular properties, such as improved thermal conductivity or mechanical strength.
9. What are the limitations of silicon nitride ceramic rings?
While silicon nitride ceramic rings have many advantages, they also have some limitations, such as:
·Brittleness, making them susceptible to cracking under extreme impact or shock
·Higher cost compared to some alternative materials like metals
·Complex manufacturing processes that may limit design flexibility
10. Where can I purchase silicon nitride ceramic rings for steel mill rail rollers?
Silicon nitride ceramic rings can be purchased from specialized manufacturers and suppliers of advanced ceramic materials. It is important to choose a reputable supplier who can provide high-quality products and offer customization options to meet your specific needs.
If you have any more questions or need further assistance, please feel free to contact us!
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