| | | | | | Songshan Enterprise Group | | | |  | Installation and operation of elementsChemical Properties | | | | | | | | | | | 1. In order to keep furnace temperature and the load-bearing uniform of each element, before installation, resistance distribution must be carried out. The resistance value deviation of each group should be below 10%.2. As the element is very brittle, be careful while install and maintain to avoid any damage.3. When start to operate the furnace, raise voltage slowly and gradually, never give full load at one time, or the heating element will be damaged by over current impulse.4. To use the elements, you should prepare the adjustable transformer or silicon controlled transformer, voltage meter, current meter and auto-control temperature meter etc. During the working, the voltage should be increased to maintain the furnace normal temperature because the resistance value will go up gradually caused by the oxidation of element. When the voltage get to the up limit of the transformer and the temperature is still low than the requirement, the furnace can be stopped, change the way of wire connection and then continue work.5. In the course of long operation of the furnace, if any individual heating element is damaged owing to certain reasons and should be changed, you should replace it with proper one whose resistance value corresponds to that of the old one, never use a new heating element random. If the heating element is much damaged or its resistance value increases too much and cannot reach the furnace temperature, it is better to replace all the heating elements with new ones. Test and mark the resistance value of the old elements having been replaced (with voltmeter and ammeter) and distribute them in low temperature area.6. Before the new furnace or the furnace that has not been used for a long time is used, they must be dryinged. When drying them, it is better to use old elements or other heat source.7. When firing apparatus or material, if there is water ejection, the furnace should have holes to eject water vapor or other waste gases in order to protect the elements service life.1. Antioxidant property of elementsThe element start to being oxidized when heat to 800? in air; a SiO2 protect film will be generated in surface of hot zone when temperature get to 1000~1300?; cristobalite will be crystallized at 1300?; the protect film get to a certain thickness when the temperature get to 1500? which make the oxidation speed being very slowly to stable. If continue to heat to over 1627?, the protect film will be damaged and oxidation speed will be more rapid evidently and make the element damaged earlier.Thought the element will be oxidized very slowly in course of application, it also will make the resistance increased following long time application, this phenomenon calls ?ageing?. In order to lower the ageing speed, we use special technology to spread a protect film on the surface of hot zone in the course of production, which enhance the Antioxidant property of element evidently and lengthen the service life. 2. The effects of alkali and alkaline metal oxide to elementsThe alkali & alkaline metal oxide will react with SiC at about 1300? and generate silicate, which calls alkali-chemical corrosion, and can influence the glowing of element.3. Some metals, such as cobalt, nickel, chrome and so on, can corrade the element in high temperature melting state and affect the service life of element. |
| | [ Contact Info ] |  Company | Songshan Enterprise Group1. Antioxidant property of elementsThe element start to being oxidized when heat to 800? in air; a SiO2 protect film will be generated in surface of hot zone when temperature get to 1000~1300?; cristobalite will be crystallized at 1300?; the protect film get to a certain thickness when the temperature get to 1500? which make the oxidation speed being very slowly to stable. If continue to heat to over 1627?, the protect film will be damaged and oxidation speed will be more rapid evidently and make the element damaged earlier.Thought the element will be oxidized very slowly in course of application, it also will make the resistance increased following long time application, this phenomenon calls ?ageing?. In order to lower the ageing speed, we use special technology to spread a protect film on the surface of hot zone in the course of production, which enhance the Antioxidant property of element evidently and lengthen the service life. 2. The effects of alkali and alkaline metal oxide to elementsThe alkali & alkaline metal oxide will react with SiC at about 1300? and generate silicate, which calls alkali-chemical corrosion, and can influence the glowing of element.3. Some metals, such as cobalt, nickel, chrome and so on, can corrade the element in high temperature melting state and affect the service life of element. | | Address | Sanlizhuang High & New Tech. Zone, Dengfeng Zhengzhou Henan 452483 China | | Phone | 86 - 371 - 62768046 | | Fax | 86 - 371 - 62768249 | | Homepage | www.songshangroup.com | | Contact | |
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