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Factory Hot Sale Gun-Type Silicon Carbide Rod Used In Metallurgy, Machinery, Chemical Industry
- Product Details
Silicon carbide electric heating elements can be used up to a maximum temperature of 1600 ℃, can be used in electric furnaces and electrical tunnel kilns with furnace temperatures between 600-1500 ℃. We can produce silicon carbide rods with different specifications from 8mm-60mm in diameter and 300-6000mm in length.
Silicon carbon rods with complete specifications, thick end type silicon carbon rods, equal diameter silicon carbon rods, dual temperature zone silicon carbon rods (five-section rods), U-type silicon carbon rods, gun-type silicon carbon rods, H-type silicon carbon rods, three-phase silicon carbon rods, single-threaded silicon carbon tubes, double-threaded silicon carbon tubes, straight tube silicon carbon tubes, and is equipped with professionally produced supporting clamps, the use of silicon carbon rods for heating is both convenient, but also safe and reliable, and for many years won the customer's widespread praise and favour.
Silicon Carbon Rod Physical Properties:
Component texture: hard and brittle, resistant to rapid cold and heat, high temperature is not easy to deform, other physical properties are as follows:
Thermal conductivity: 20 calories / m - hour - degrees
Coefficient of linear expansion: 5 × 10-6(m/°C)
Silicon carbon rod chemical properties:
Silicon carbon rods have good chemical stability and strong acid resistance. Alkaline substances have an erosive effect on it under high temperature conditions.
Silicon carbon rod components in the long-term use of more than 1000 ℃ can occur with oxygen and water vapour as follows:
①Sic+2O2→Sio2+CO2 ②Sic+4H2O=Sio2+4H2+CO2
The content of SiO2 in the component increases gradually, and the resistance increases slowly as it ages. If too much water vapour, it will promote the oxidation of SiC, H2 generated by the ② reaction with the O2 in the air combined with H2O and then react to produce a vicious circle. Reduce component life. Hydrogen
(H2) can reduce the mechanical strength of components. Nitrogen (N2) below 1200 ℃ can prevent SiC oxidation above 1350 ℃ and SiC reaction, so that SiC decomposition of chlorine (Cl2) can make Sic completely decomposed.
Physical property
| Item | Unit | Value |
| density | g/cm3 | ≧2.6 |
porosity | % | 18-20 |
| Flexural strength | MPa | ≧50 |
| hardness | mohs | 9.8 |
| Thermal expansion | ×10-6K-1 | 4.8 |
| Specific heat | /•℃ | 0.183 |
| thermal conductivity | /cm•℃ | 0.0365 |
| heating resistivity（1050°C） | Ω•mm2/m | 700-1500 |
| cold end resistivity（20°C） | Ω•mm2/m | 18-24 |
| emissivity | 0.9 |
Chemical property
| Ingredients | SiC | Fe2O5 | Al2O3 | Si+SiO2 | C |
| concentration | ≧98.5 | ≦0.5 | ≦0.2 | ≦0.4 | ≦0.3 |
1、The Resistance value of silicon carbide largelyaffected by temperature.Between 0-850℃,theresistance temperature is negative, above 850℃present positive value. The resistance is measured atthe temperature of 1050℃±50
2、Characterisitic curve of the temperatureresistance.With the increase of the temperature,it shows a nonlinear variatio
3、Mode of connection: Triangle ( △ ) connection;star (Y) connection;Series connection；Parallelconnection；Parallel series;String association.
4、The relationship between the surface temperature resistance and the speed of increasing.
5、The relationship between carbon surface temperature,furnace temperature,the density of surface load.
The service life of the silicon carbide heating element is affected by the difference in the intrinsic quality of the heating element, but also by the use temperature of the heating element, the heating part of the surface negative
Load density, surface coating, power supply (intermittent and continuous use), control mode (with or without voltage regulator, power regulator), wiring (series, parallel) and furnace atmosphere and other factors.
(series, parallel, etc.) and the furnace atmosphere and other factors.
3, the furnace atmosphere on the impact of silicon carbon rods
(1) the influence of dry air: silicon carbon rods can be used in high temperature (1500 ℃) dry air for a long time, resistance increases slowly. Oxygen (O2) and
SiC reacts at high temperature to produce silicon dioxide (SiO2). Due to the formation of a protective film of SiO2 on the surface of the silicon carbon rod, the silicon carbon rod has a strong
oxidation resistance.
(2) the effect of water vapour: water vapour (H2O) at 1100 ℃ and SiC strong chemical reaction occurs, the generation of Si, SiO2 and C. Silicon carbon rod surface cracks, resistance growth rate.
Cracks appear on the surface of the silicon carbon rod, and the resistance grows very fast.
(3) the influence of nitrogen (N2): when the surface temperature of the silicon carbon rod reached 1400 ℃, N2 and SiC reaction, the generation of silicon nitride, so that the silicon carbon rod resistance value increased significantly.
The resistance value of the silicon carbon rod grows significantly.
(4) Hydrogen (H2): At 1250℃, H2 reacts with SiC to form methane (CH4), which destroys the SiC heater.
(5) the impact of ammonia (NH2): NH2 can be decomposed into N2 and H2 at high temperature, so the use of temperature should be controlled below 1250 ℃.
(6) Sulfur dioxide (SO2) impact: SO2 at 1300 ℃ and SiC reaction, so the use of temperature should be controlled at 1300 ℃ below.
(7) the impact of chlorine (Cl2): Cl2 at 600 ℃ will react with SiC, at 1200 ℃, Cl2 will be completely decomposed silicon carbon rods.
4, SiC and hydrochloric acid (HCl), sulfuric acid (H2SO4) at high temperatures do not react. Concentrated phosphoric acid (H3PO4) at 250 ℃ and SiC reaction.
Oxygen (O2), methane (CH4), carbon dioxide (CO2) and silicon dioxide (SiO2) are produced. Mixture of concentrated nitric acid (HNO3) and hydrofluoric acid (HF)
At room temperature can dissolve SiC.
5, in 1000 ℃, silicon carbon rods can be with alkaline oxides, alkali and alkaline earth metal chemical reaction, so the use of temperature should be controlled at 1000 ℃
Over the years, we have worked hard to promote and realize the modernization of alloy sales, and actively cultivated and enhanced the ability of employees' independent innovation. All-round renovation and upgrade of the original business site, facilities and equipment, and modern computer management. Hope to establish long-term partnerships and win market reputation.
We are increasing thescale of trade and customers through out the world. With our good reputation we have won the trust of our customers. It's helps the modernisation of our country and promote the economic and technical exchanges with the rest of the world. We also look forward to enhance the friendship with other countries and make positive impact.
We warmly hope that you and us together, hand in hand, create a glorious future.
FAQ
Q：I have sent the RFQ, when can I expect a reply?
A：We usually quote within 24 hours after we get your inquiry. If you are urgent to get the price, please send the message on trade management or call us directly.
Q：How long is the delivery time?
A：It depends on the order quantity ,Usually it takes about 20-30 days.
Q：Do you accept OEM/ODM manufacturing?
A：Yes! We do accept OEM/ODMmanufacturing. You could give us your samples or drawings.
Q：Can you send me your catalogue?
A：Yes, please contact us.We can share with our catalogue for you by email.
Q：How to control the products quality in your company?
A：With professional quality team, advanced product quality planning, strict implementation, continuous improvement, the quality of our products is well controlled and consistent.
Q：Can you provide detailed technical data and drawing?
A：Yes, we can. Please tell us which product you need and the applications, we will send the detailed technical data and drawing to you for your evaluation and confirm.
