Place of Origin:
China
Brand Name:
Ruideer
Certification:
CE
Model Number:
336/4412/5518
CE ISO high temperature vacuum gas pressure sintering ceramic silicon nitride furnace
This kind of equipment is used for sintering of silicon nitride ceramic substrates,bearing balls,ball valve bodies,thermocouple protection sleeves and other parts with various pressure levels.
| Furnace Type | Horizontal type(Max Working pressure:58bar/98bar | |||
| RDE-3312-N | RDE-4412-N | RDE-5512-N | RDE-5518-N | |
| Usable Space (W*H*L) | 300*300*1200mm | 400*400*1200mm | 500*500*1200mm | 500*500*1800mm |
| Max.Charge Load | 300kg | 500kg | 1200kg | 1500kg |
| Power Rating | 320KVA | 320KVA | 430KVA | 600KVA |
| Heating Zone | 2/3 Zones | 3 Zones | 3 Zones | 3 /4 Zones |
| Cooling time | ≤5h | ≤6h | ≤7h | ≤8h |
|
Empty furnace, cooling from sintering temperature 2100℃ to 100℃. (water temperature≤26℃, water pressure 2-3bar, 55bar(95bar)≤Ar pressure≤58bar(98bar). |
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| Service Life | 20years/6000furnace cycles | |||
| Max. Working Temp | 2000℃ | |||
| Temperature Measurement | Special design High temperature W-Re5/26 Thermocouple | |||
| Max Vacuum Degree | 1Pa (under cold, empty, dry furnace) | |||
| Leakage Rate | 3Pa/h (Average value under cold, empty, dry furnace) | |||
| Input gas | N2, Ar, | |||
| Functions |
Automatic Positive Pressure, Negative Pressure Leak Detection Vacuum Sintering Partial Pressure Sintering (Static, Dynamic) Pressure Sintering Rapid Cooling Fully-automatic control & Safety interlock& Breakpoint continuing heating & Wireless remote control& Self-diagnosis |
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Preparation of silicon nitride ceramics
1. Reaction sintering method (RS)
Using the general molding method, the silicon powder or a mixture of silicon powder and silicon nitride powder is first pressed into a raw billet of the desired shape and pre-nitrided in a nitriding furnace at 1200°C. The pre-nitrided raw billet already has a certain strength and can be machined. Finally, the product is sintered again at 1400°C (the temperature of silicon melting point) or higher to obtain a product with little dimensional change. At this point, the product can be used without grinding.
Pros: low shrinkage, suitable for the preparation of complex shapes, precise size parts, low cost
Cons: long nitriding time, low strength, high porosity
2. Hot press sintering (HPS)
Si3N4 powder and sintering additives (such as MgO, Al2O3, MgF2, CeO2, Fe2O3, etc.) are sintered at a pressure of 1916 MPa or more and a temperature of 1600 °C or more. In the hot pressing sintering process, heating while pressurizing from the uniaxial direction makes the forming and sintering completed simultaneously, which can accelerate the rearrangement and densification of the material. If the Si3N4 ceramic material is pre-oxidized under the high-temperature condition of 1400~1500℃, the Si2N2O phase can be formed on the surface of ceramic material, it can significantly improve the oxidation resistance and high-temperature strength of Si3N4 ceramic.
Pros: the prepared Si3N4 ceramics have superior mechanical properties than Si3N4 sintered by other processes, high density, high strength, and short preparation cycle
Cons: high manufacturing cost, complex sintering equipment, high sintering shrinkage, single product shape
3. atmospheric pressure sintering (PLS)
In terms of increasing the pressure of sintering nitrogen atmosphere, the nature of Si3N4 decomposition temperature increase is used to perform atmospheric pressure sintering in the temperature range of 1700~1800℃, followed by pneumatic pressure sintering in the temperature range of 1800~2000℃. The use of pneumatic pressure promotes the densification of Si3N4 ceramics and thus increases the strength of the ceramics.
Pros: high density, high strength
Cons: high cost, complicated sintering equipment
4. Pneumatic sintering method (GPS)
Sintering of silicon nitride is performed at a temperature of about 2000°C under 1 to 10 MPa air pressure. The high nitrogen pressure inhibits the high-temperature decomposition of silicon nitride. The sintering temperature of this method is slightly higher than that of other sintering methods, and it can promote the growth of Si3N4 grains with the addition of fewer sintering aids, and the final sample is a long columnar grain ceramic with high density and strength.
Pros: high densities, high strengths, good wear resistance, complex shapes, and suitable for mass production
Cons: process conditions are relatively difficult to control
5. Discharge plasma sintering method
The discharge plasma sintering method has a fast heating rate, high sintering temperature, and uniform heating, which can achieve rapid sintering of dense sintered bodies.
Pros: simple operation, low technical requirements, fast sintering speed
Cons: large investment in equipment, single furnace output is small
6. Microwave sintering method
The most important feature of the microwave sintering method is its unique heating mechanism. Microwaves direct interaction with material particles (molecules, ions), the use of microwave has a special wavelength and the basic microstructure of the material coupled to generate heat, the material loss of the medium so that the overall heating of the material to the sintering temperature and achieve densification method. Because of its extremely fast heating rate, it is conducive to increasing the rate of densification, and can effectively inhibit the growth of grains, but also to obtain ceramic products that can not be obtained by conventional sintering methods.
• Design standards
The equipment is designed in accordance with the pressure vessel requirements of the Quality and Technical Supervision Bureau, and is qualified after pressure testing and shipped. The electrical design and construction meet national standards.
• Installation pre-test and pre-acceptance
The equipment is fully assembled in our factory, including all pipelines, vacuum pipelines, process gas pipelines, cooling water pipelines, compressed air pipelines, etc. Pre-testing can be carried out after installation. At the customer site, pipelines other than the equipment are provided by the customer. The installation also includes the connection of all cables. At the customer site, the main cable connecting the power cabinet is provided by the customer. After installation, we conduct vacuum and positive pressure leakage tests on the entire equipment, as well as mechanical and electrical function tests.
• Disassembly and transportation
The equipment will be disassembled in several large parts, packed in a standardized manner, and loaded into the transport vehicle.
• Customer site installation and commissioning
The Redel after-sales engineer will lead the team to complete commissioning, product trial burning and other work within 20 working days. The customer needs to make appropriate preparations and provide the necessary tools, such as hoisting and lifting equipment. And provide installation personnel support (it is recommended to have 1 mechanical personnel and 1 electrical personnel).
• Final acceptance
After installation and commissioning, the equipment can be finally accepted in accordance with the requirements of the technical contract.
• Training
Our after-sales engineers will provide a systematic and complete on-site training, including operation, maintenance, troubleshooting, etc.
• Technical data delivery
To ensure safe operation and equipment maintenance, the following technical data will be provided to customers:
1. Equipment installation layout
2. User manual
3. Spare parts list
4. Electrical drawings
5. Component manual
FAQ
Q: Are you a factory or trading company?
A:We are China leading high-temperature vacuum furnace manufacturer with over 10 years’ experience.
Q: Do you have customization or OEM service??
A:Yes,we have powerful R&D team and high-tech equipment.So we can not only supply the regular model,but also the customizable furnace as the repuirment of our clients.
Q:What's your advantage?
A:
l Quick response to your enquiry
l High quality control
l Stable supply chain
l Timely delivery
l Excellent after-sales service
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