Custom Diamond Polished SiC Silicon Carbide Ceramic Seal Ring for
Pump
Main features of the SiC ceramic seal ring
1. Exceptional hardness, the physical hardness is up to 2500MPa
2. Superb chemical stability against hot strong acid and alkali and
free of rust forever
3. Excellent wear-resistance and abrasion resistance, over 276
times than stainless steel
4. Perfect sliding surface quality: diamond-like surface, the
roughness to be Ra0.1
5. High-temperature resistance, stand with over 1600℃ free of
deformation
6. Great mechanical properties, hardness, compressive and flexural
strength
7. Precise and consistent dimensions every batch via fine grinding,
CNC machining
8. Eco-friendly and safe, the material meets FDA, LFGB completely
9.Stable breaking strength, and less variance in figure or
dimension
Specification of the SiC ceramic seal ring
| Available materials | Silicon carbide (SiO2), 95%, 99%, 99.5% alumina, and Silicon
nitride (Si3N4) |
| Roughness | Fine polishing better than Ra0.3, diamond polishing better than
Ra0.1 |
| Dimension | The max. outer diameter up to 50mm |
| Other parameters | Flatness to be 0.002mm, perpendicularity: 0.005mm, Parallelism :
0.002mm |
| Nominal tolerance | Size less than 10mm with 0.10mm, size over than 10mm with 1% of
dimensions |
| Precision process | Polishing, fine grinding, CNC machining |
Description of the Silicon carbide ceramic seal ring
Silicon carbide (SiC) is in the same family of technical ceramics,
but SiC ceramic has much better hardness and lubrication than other
ones. There are 2 types of silicon carbide, the one is directly
sintered silicon carbide(SSiC), another one is reaction-bonded
silicon carbide(RBSiC) . SSiC can withstand higher temperature and
pressure than RBSiC. Besides, Silicon carbide offers superb wear
resistance, chemical stability, it's an ideal choice for ceramic
seals in the sealing system.
The ceramic seal ring plays a key role in water, oil, gas sealing
system, we always ensure that we manufacture best-quality products
through strict quality control in every process, we introduced KPI
into our manufacturing flow chart and keep all batches with
consistent dimensions.
We offer a variety of customized and standard seal ceramic rings
from prototyping to massive production. All these ceramic seal
rings are widely used in a different water pump, gas & oil
production, chemical & petrochemical, refinery, power,
pharmaceutical and so on.
Datasheet of technical ceramic seals
| Property | Units | Materials |
| 99.5%Al2O3 | 99%Al2O3 | 95%Al2O3 | SiC | Si3N4 |
| Density | g/cm3 | ≥3.85 | ≥3.80 | ≥3.60 | ≥3.21 | ≥3.2 |
| Water absorption | % | 0 | 0 | 0 | 0 | 0 |
| Hardness | HV | 1700 | 1700 | 1500 | 2500 | 1550 |
| Flexural strength | Mpa | ≥379 | ≥338 | ≥320 | ≥550 | ≥600 |
| Compressive strength | Mpa | ≥2240 | ≥2240 | ≥2000 | ≥3306 | ≥2500 |
| Fracture toughness | Mpa m1/2 | 4-5 | 4-5 | 3-4 | 3 | 6 |
Max. service temperature (Non-loading) | ℃ | 1675 | 1600 | 1500 | 1600 | 1200 |
| CTE (20-800℃) | 1×10 -6 /℃ | 6.5~8.0 | 6.2~8.0 | 5.0~8.0 | 3.7~4 | 3.1 |
| Thermal shock | T(℃) | ≥250 | ≥200 | ≥220 | ------ | ≤1000 |
| Thermal conductivity(25℃) | W/m.k | 30 | 29 | 24 | 150 | 15~20 |
| Volume resistivity (25℃ ) | ohm.cm | ＞1 x 10 14 | ＞1 x 10 14 | ＞1 x 10 14 | ＞1 x 10 5 | ＞1 x 10 12 |
| Insulation strength | KV/mm | 19 | 18 | 18 | ------- | ------- |
| Dielectric constant(1Mhz) | (E) | 9.7 | 9.5 | 9.5 | ------- | -------- |
Packaging proposal and transportation solutions
1. We will keep the ceramic parts inside the inner package to be
fixed without moving, then it will prevent them from collision each
other, to avoid any cause any chippings during transportation.
2. In addition, the inside of the outer carton will be filled with
sufficient protective kinds of stuff.
Why choose us?
★ 1 0+ Years of manufacturing experience in OEM, ODM ★ Powerful R&D,
mass production capability
★ In-house comprehensive manufacturing types of equipment ★
Rigorous quality control system and processes
★ Surpassing pre-sales and after-sales service ★ Abide all orders
as the first priority
FAQ
Q1. Are you a factory or trading company?
A: We are a manufacturer. You are welcome to visit our factory.
Q2: Do you send a sample to check?
A: Sure, the sample is free and freight collect.
Q3: When will you ship it?
A: If the products are in storage, we'll ship within 48 hours
Q4: When can I get the price?
A: We regularly quote within 24 hours after we get your inquiry. If
you are in urgent need of getting the price.
Please call us or tell us in your email so that we will proceed
with your inquiry as a priority.
Q5: Is it available to provide customized products?
A: We always support custom-made demand as per different materials,
dimensions, and designs.
Q6: How to ensure quality?
A: The dimension out of any batch will be carried out sampling
inspection per international AQL standard. A 100% cosmetic
inspection will be done.
Q7: What other products are you dealing with?
A: We focus on a variety of ceramic tubes, ceramic substrates,
ceramic sheets, textile ceramics besides metalized ceramics.
