Silicon carbide is widely used in many high-end industries, such as metallurgy, chemical engineering, and semiconductor manufacturing. It possesses excellent mechanical, thermal, and chemical properties. Reaction Bonded SiC (RBSiC) and Pressureless Sintered SiC (PSSiC) are 2 types of them. They have different performances and applications because of different preparation processes.
This article will introduce the properties, applications, and practical cases of RBSiC and PSSiC to help you decide which one is suitable for your industrial production and how to choose.
What is Reaction Bonded Silicon Carbide (RBSiC)?
RBSiC, also called SiSiC, is a process for SiC ceramics. In this preparation process, liquid silicon infiltrates into carbon to form SiC crystals at 1500-1800℃ under a protective atmosphere.
Process Flow of Reaction Bonded Silicon CarbideThe characteristics of RBSiC include:
- High Hardness
- High-Temperature Resistance
- Thermal Stability
- Corrosion Resistance
RBSiC is widely used in many industrial fields, such as:
High-Temperature Metallurgy and Kiln. RBSiC is applied for producing kiln furniture and furnace linings that withstand high temperatures and corrosion. Using RBSiC products can extend the service life of equipment.
Mechanical Field. RBSiC can be employed as mechanical seals. Its stable performance ensures the normal and efficient operation of equipment.
Read more: What is RBSiC? Everything You Need to Know About It
What is Pressureless Sintered Silicon Carbide (PSSiC)?
PSSiC is also a SiC ceramic preparation process. This method uses high-purity SiC powder combined with sintering additives. Without external pressure, the process is conducted at high temperatures of 1900-2200℃.
Process Flow of Pressureless Sintered Silicon CarbideThe characteristics of PSSiC include:
- Extremely High Density
- Superior Corrosion Resistance
- Excellent Mechanical Properties
- Wide Temperature Adaptability
PSSiC is mainly applied in high-end industries, suitable for harsh operating conditions. For example:
Chemical Industry. PSSiC is used to manufacture reactor linings, corrosion-resistant piping, and heat exchangers. PSSiC products are preferred for highly corrosive environments.
Semiconductor Manufacturing. PSSiC can be used to manufacture semiconductor wafer processing components like end effectors and chucks, meeting the requirements of high precision and purity.
Read more: What is PSSiC? Definition, Properties, and Applications
Differences Between RBSiC and PSSiC
To present the differences between RBSiC and PSSiC clearly, the table below provides a detailed comparison of the two materials.
| Item | RBSiC | PSSiC |
| Material Composition | Silicon Carbide 7–15% Free Silicon Small amount of unreacted carbon | High-purity Silicon Carbide Almost no free silicon |
| Density | 2.9-3.1 g/cm³ A small amount of micropores | > 3.1 g/cm³ nearly fully dense Porosity < 0.5% |
| High-Temperature Resistance | Long-term service temperature 1400-1600℃ | Long-term service temperature ≤ 1200℃ |
| Corrosion Resistance | Withstand most acid and alkali media Not resistant to strong oxidizing agents | Withstands all types of strong acids, strong alkalis, and organic solvents |
| Mechanical Properties | High hardness High strength Flexural strength 300-500 MPa | Higher strength High toughness Flexural strength 450-550 MPa |
| Production Cost | Lower | Higher |
| Forming Difficulty | Lower Producing large-scale and complex-shaped products | Higher Suitable for precision, small-scale, high-performance products |
Which Industries Typically Use RBSiC?
RBSiC is a suitable choice for industries mainly with high-temperature and wear operating conditions. In metallurgy, ceramic kilns, or the photovoltaic industry, RBSiC will be the most suitable for you.
RBSiC is widely used for high-temperature furnace linings and casting molds in metallurgy. Its high-temperature resistance of up to 1600℃ can effectively resist molten metal erosion. Using RBSiC products can extend the service life of your furnace, reducing the need for equipment replacement.
Kiln furniture and rollers made of RBSiC possess excellent thermal shock stability. Even subjected to rapid temperature changes, they maintain stable structures. Using RBSiC products will reduce downtimes due to damaged kiln furniture, lowering energy consumption.
In the mining and machinery industries, pipe linings, mechanical seals, and bearings made of RBSiC can withstand severe wear conditions, significantly extending the service life of components.
Which Industries Typically Use PSSiC?
PSSiC is primarily applied in high-end industries where operating conditions are severe. These fields usually have strict requirements on material performance. If you are engaged in fine chemicals, defense, or semiconductor manufacturing, PSSiC can perfectly solve your issues.
In the chemical industry, PSSiC is used to fabricate reactor linings, corrosion-resistant piping, and heat exchangers. These products can withstand highly corrosive concentrated nitric acid and hydrofluoric acid. Even under severe corrosive conditions, they can operate stably for at least 5 years, far exceeding metallic materials.
PSSiC has wide applications in the defense and military fields. Because of its high-temperature resistance, corrosion resistance, and high-strength, PSSiC can be used to manufacture aero-engine components and specialized protective equipment. They ensure the long-term stable operation and the safety of personnel.
Wafer processing components made of PSSiC feature high purity and high precision. They meet the strict requirements for the control of impurity in semiconductor manufacturing.
RBSiC vs. PSSiC: How to Choose the Right One?
RBSiC or PSSiC? Based on your production needs, you can make the choice by evaluating the following 4 dimensions.
Operating Temperature
If the equipment operates in high temperatures above 1400℃ → RBSiC should be your choice.
If the operating temperature is below 1200℃ → PSSiC is more suitable.
Corrosion Intensity
For common acids and alkalis, where the conditions are mainly wear and high temperatures → RBSiC can meet the requirements.
Highly corrosive media, or applications requiring extremely high purity of the medium → Choose PSSiC.
Cost Considerations
For large production scales with strict cost control → RBSiC offers better cost-effectiveness.
In high-end fields where equipment lifespan and operational stability are important→ PSSiC is more cost-effective.
Forming Requirements
If you need large-scale or complex-shaped products → RBSiC has lower forming difficulty.
If you need precision, small-scale, high-performance products → PSSiC provides higher density and precision.
Practical Cases
An enterprise involved in metallurgy and fine chemicals selected RBSiC and PSSiC materials based on their operating conditions.
Metallurgy Workshop
The enterprise’s metallurgy workshop mainly produces specialty steel. It uses high-temperature electric arc furnaces. The company used traditional refractory materials as furnace linings before. Replacement was required nearly every three months, bringing high maintenance costs and frequent interruptions.
After using RBSiC furnace linings, the service life of the linings extended to over 12 months. Annual maintenance costs were reduced by 60%, and production continuity improved significantly. Moreover, the generation of refractory waste was minimized, achieving both energy savings and consumption reduction.
Fine Chemicals Workshop
The enterprise’s fine chemicals workshop mainly produces pesticide intermediates. This process involves highly corrosive media. Titanium alloy heat exchangers would experience corrosion leaks within 3 to 6 months. Maintenance costs reached as high as $300,000 every year. It also presents a major safety hazard.
The company replaced these with PSSiC heat exchangers. The equipment has been operating stably for 3 years since the replacement, and maintenance costs every year have dropped below $100,000, completely resolving the issue of corrosion leakage.
Conclusion
If you find highly cost-effective items in high-temperature and wear-resistant applications, RBSiC will be your optimal choice. If your operations involve strong corrosion and high precision, PSSiC provides a reliable guarantee. Selecting one based on your practical needs can significantly enhance your production efficiency and reduce costs.
Want to buy silicon carbide products? With 14 years of experience in the production and export of silicon carbide ceramics, Newthink can help you quickly match the most suitable products for your needs. Contact us to receive the latest quotation.
Thanks for your reading. Hope this article will be helpful.
FAQs
- What is SiSiC material?
SiSiC is another name for RBSiC. It is a process to form dense silicon carbide crystals.
- RBSiC or PSSiC, which is better for high-temperature applications?
RBSiC is better. It can withstand long-term temperatures up to 1600℃, while PSSiC is below 1200℃.
- Is PSSiC suitable for strong corrosion environments?
Yes. It resists strong acids, alkalis, and organic solvents, and outperforms metal materials.
- How to choose between RBSiC and PSSiC?
Evaluate temperature, corrosion intensity, cost, and shape. Choose RBSiC for high heat, PSSiC for high purity and extreme chemical resistance.
- What are the advantages of PSSiC?
PSSiC offers extremely high density and corrosion resistance. It provides higher strength and high-precision finishes.
- Which is more cost-effective, RBSiC or PSSiC?
RBSiC has lower production costs for large scales. PSSiC is more cost-effective in high-end fields.
