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SiC Silicon carbide armor Vacuum Sintering Furnace
it has whole system of temperature control, program process and security mechanisms,Also available for the sintering of other matirials or other heat treatment.
Different Sintering method:
Pressureless sintering
Pressureless sintering is considered as the most promising method for SiC sintering. According to different sintering mechanisms, pressureless sintering can be divided into solid-phase sintering and liquid-phase sintering. Through ultra-fine β- A proper amount of B and C (oxygen content less than 2%) were added to SiC powder at the same time, and s. proehazka was sintered to SiC sintered body with density higher than 98% at 2020 ºC. A. Mulla et al. Al2O3 and Y2O3 were used as additives and sintered at 1850-1950 ºC for 0.5 μ m β- SiC (particle surface contains a small amount of SiO2). The relative density of the obtained SiC ceramics is greater than 95% of the theoretical density, and the grain size is small and the average size. It is 1.5 microns.
Hot press sintering
Pure SiC can only be sintered compactly at very high temperature without any sintering additives, so many people implement hot pressing sintering process for SiC. There have been many reports on the hot pressing sintering of SiC by adding sintering aids. Alliegro et al. Studied the effect of boron, aluminum, nickel, iron, chromium and other metal additives on SiC densification. The results show that aluminum and iron are the most effective additives to promote SiC hot pressing sintering. The effect of adding different amount of Al2O3 on the properties of hot pressed SiC has been studied. It is considered that the densification of hot pressed SiC is related to the mechanism of dissolution and precipitation. However, the hot press sintering process can only produce SiC parts with simple shape. The quantity of products produced by the one-time hot press sintering process is very small, which is not conducive to industrial production.
Hot isostatic pressing sintering
In order to overcome the shortcomings of the traditional sintering process, the type B and type C were used as additives in the scuba, and the hot isostatic pressing sintering technology was used. At 1900 ° C, fine crystalline ceramics with a density greater than 98 were obtained, and the bending strength at room temperature could reach 600 MPa. Although hip sintering can produce dense products with complex shapes and good mechanical properties, hip sintering must be sealed, which is difficult to achieve industrial production.
Reaction sintering
Reaction sintered silicon carbide, also known as self bonded silicon carbide, refers to the process in which porous billet reacts with gas or liquid phase to improve billet quality, reduce porosity, and sinter finished products with certain strength and dimensional accuracy. take α- SiC powder and graphite are mixed in a certain proportion and heated to about 1650 ºC to form a square billet. At the same time, it penetrates or penetrates into the billet through gaseous Si and reacts with graphite to form β- SiC, combined with existing α- SiC particles. When Si is completely infiltrated, the reaction sintered body with complete density and non shrinkage size can be obtained. Compared with other sintering processes, the size change of reaction sintering in the densification process is small, and the products with accurate size can be prepared. However, the existence of a large amount of SiC in the sintered body makes the high-temperature properties of reaction sintered SiC ceramics worse.
Characteristics
1. High temperature uniformity and thermal efficiency
2. Multi-zone independent temperature control, vacuum partial pressure function
3. The main body adopts high temperature resistant material, which satisfies the carbonation heating process of thin and medium and thick granule WC powder and composite material.
4.Adopt the combination mode of temperature control.
5.Graphite heat shield, graphite heating element,360-degree surround radiant heating.
6.A variety of condensation trapping methods to reduce unit pollution
7.Nitrogen purging system has better insulation and degreasing.
8.Patented insulation technology to ensure the long-term use of heating body
9.Exhaust gas combustion and filtration system meets emission standard
Standard model specification and parameters
| Model | PJ-SJ336 | PJ-SJ447 | PJ-SJ449 | PJ-SJ4411 | PJ-SJ8820 |
| Effective Hot Zone LWH (mm) | 300*300*600 | 400*400*700 | 400*400*900 | 400*400*1100 | 2000*800*800 |
| Load Weight(kg) | 120 | 200 | 300 | 400 | 1000 |
| Maximum Temperature(ºC) | 2400 | ||||
| Temperature control accuracy(ºC) | ±1 | ||||
| Furnace temperature uniformity(ºC) | ±5-20 | ||||
| Work Vacuum Degree(Pa) | 6.0 * E -1 | ||||
| Pressure raise rate (Pa/H) | ≤ 0.5 | ||||
| Debinding rate | >99.5% | ||||
| Debinding method | N2 in negative pressure,H2 in atmosphere | ||||
| Input gas | N2,Ar | ||||
| Cooling Speed | adjustable | ||||
| Cooling method | Vacuum cooling,Pressure cooling,Forced pressure cooling | ||||
| Sintering method | Vacuum sintering,partial pressure sintering,pressureless sintering | ||||
| Furnace structure | Horizontal, single chamber | ||||
| Furnace door opening method | Hinge type | ||||
| Heating elements | Graphit heating elements | ||||
| Heating chamber | Composition structure of Graphit hard felt and soft felt | ||||
| Thermocouple | C Type | ||||
| PLC & Electric elements | Siemens | ||||
| Temperature controller | EUROTHERM | ||||
| Vacuum pump | Mechanical pump and roots pump | ||||
Customized optional:
Quick cooling system
high vacuum system
Hot press system
HIP system
- Most important: Human. Human is the most important point in every work. We have complete training courses for every new worker, and we have rating system to rate every worker to a level (junior, middle, high), different level workers are apponted to different jobs with different salary. In this rating system, it's not only the skills, but also rate in responsibility and error rate, executive power etc. By this way, workers in our factory are willing to do the best in his work.And strictly follows the quality management rules.
- Best materials and components: We only purchase the best materials on market, we know that saves 1 dollar in material would cost 1000 dollars in final. The key parts like electric components and pumps are all brand products like Siemens, Omron,Eurotherm, Schneider etc. For the other parts made in China, we choose the best factory in industry and signed product quality guranntee contract with them,to ensure every component every parts we use in the furnace is the best quality products.
- Strict Quality management: We have 8 quality check points in the processes of furnace producing, Examination in each check point is carried by 2 workers and 1 factory manager is responsible for it. In these check points, materials and components, and every aspects of the furnace are double checked to ensure its quality. At last, before the furnace leaves factory, it should be final checked with heat treatment experiments.
General introduction of PAIJIN Vacuum furnaces
Hi,my friend, thanks for checking Paijin Vacuum furnaces. I will show you why our products are your best choose.
Technical advantages:
- Energy saving: By using our self-owned registered patented technology of energy saving, our furnaces saves 20%-40% energy than other brands in heating. Reduces muh cost.
- High Intelligent Control system:All our furnaces are equiped with our high intelligent control system, it can realize one button operation by the recorded data and record the processs in Computer.
- Advanced Voltage control technology, lower current in same power to avoid the melting of cables, and raise safety level.
Processes
Paijn vacuum furnaces are basically composed by Furnace body, heating system, vacuum system, gas recharge system and control&measure systems.
A standard vacuum furnace would able to used for the basic processes like:
Annealing
Tempering
Brazing
Sintering
Hardening
In Vacuum and Atmosphere conditon.
By adding some fuction parts, it will realize or strengthen its ability in
Carburizing
Debinding
Nitriding
Oil hardening
Low temperature difference brazing (≤±3ºC)
Hot zone materials:
Graphite Hot Zones
Graphite hot zones are long-lasting and can deliver excellent ROI. They are robust, economical to repair and incorporate hearth designs with high creep strength.
All-Metal Molybdenum Hot Zones
If your process is susceptible to graphite contamination, a molybdenum hot zone can meet your needs. Our moly hot zone elements feature a "double-U" profile which makes them easy to install and replace.
Custom Constructions
We offer custom hot zone construction such as graphite insulation with moly heating elements, for applications with unique requirements.
Payment terms and ordering process:
We accept paymen by TT:
20% TT in advance, 50%TT after confirmation of drawings and 30% TT after PSI but before loading on board
or 100% LC at sight.
Ordering Process:
Confirm user's technical specification requirement----Quotation with specification---confirm specification and other terms---sign contract--first payment or Issurance LC----Drawing confirmation----Manufacturing---Preshipment inspection and training---Shipment----field service like installation and commission(optional)---after sales service
Produce time and delivery schedules
According to different model and requirements about the furnace, It need about 3-8 monthes for the produce of the furnace.
After the finish of the furnace, User's representatives are invited to visit our factory and inspect the furnace in our factory.Meanwhile,we can supply 1-2 weeks free training courses for them in our factory.
After the pre-shipment inspection and final payment, we will arrange the shipping within one week.
Packages and Shipping:
We have much experience in the packages and shipping, our furnaces are usually shipped by rail or by sea. Sometimes small parts my shipped by air. The main body will be fixed in the container by steel ropes and other parts will be packaged in wooden cases.
After sale service:
a. Quality Guarantee
We supply a guarantee period of 12 months reckoning from the date of commissioning of the furnace against all defects or failures due to faulty design, material, or workmanship. But within 18 monthes after the furnace is deliveried from our factory.
b. Backup support for provisioning of spares for 15 x years.
c. Technical Support:We supply 15 years free online technology support for our furnaces.
