Elements suitable for most applications in which silicon carbide elements are used. STA SiC heating elements feature hot zones of recrystallized silicon carbide, optimized for resistance to oxidation and common process gases. Available in rod or multi-leg designs.
Silicon carbide element manufacturers typically produce a family of elements using different grades of material and different manufacturing techniques to tailor each product to a specific range of application. The effects of furnace atmosphere on SiC element (Maximum Element Temperature) MET needs to be considered in designing the furnace. The lowest METs is achieved in vacuum, both because any protective silicon dioxide layer formed by pre-oxidation will deteriorate under hard vacuum and because SiC actually vaporizes at elevated temperature under high vacuum conditions.
The element tubes consist of a central heating section referred to as a hot zone and two terminal sections called cold ends. The cold ends are infused with silicon metal to bring down their resistance and operating them at a lower temperature. The extreme ends of the elements are coated with aluminum contact surface with low resistance to which the electrical connections are made with braided aluminum straps. Elements are described by giving the- overall length, the heating section length, the diameter and the resistance.
All SiC heating elements oxidize (or otherwise react with the furnace atmosphere) and increase in resistance during their life in operation. Eventually, they either can no longer generate sufficient heat or they fail mechanically, and in either case they must be replaced. Traditionally, SiC heating element power supplies have been designed to supply full-rated power even if the element increases in resistance to four times the new element resistance (a 300% resistance increase). Practically speaking, such a high resistance increase is seldom reached. An allowance for a factor of two to three increases (100-200%) is usually sufficient.
Advantages:
· Available in a wide range of shapes and sizes
· Self-supporting, they can be used in furnaces that are too wide or too long to be spanned by metallic or MoSi2 heating elements
· Capable of higher operating temperatures and higher watt loadings than metallic elements
· Relatively easy to change while the furnace is hot
STA sic heating element has ED DB U W SCR and SGR Etc type ,The resistance of sic heater varies highly non-linear manner vs. temperature for all SiC elements, and the industry standard is to report this number at a temperature ~800C to 1000C.
Silicon carbide element manufacturers typically produce a family of elements using different grades of material and different manufacturing techniques to tailor each product to a specific range of application. The effects of furnace atmosphere on SiC element (Maximum Element Temperature) MET needs to be considered in designing the furnace. The lowest METs is achieved in vacuum, both because any protective silicon dioxide layer formed by pre-oxidation will deteriorate under hard vacuum and because SiC actually vaporizes at elevated temperature under high vacuum conditions.
The element tubes consist of a central heating section referred to as a hot zone and two terminal sections called cold ends. The cold ends are infused with silicon metal to bring down their resistance and operating them at a lower temperature. The extreme ends of the elements are coated with aluminum contact surface with low resistance to which the electrical connections are made with braided aluminum straps. Elements are described by giving the- overall length, the heating section length, the diameter and the resistance.
All SiC heating elements oxidize (or otherwise react with the furnace atmosphere) and increase in resistance during their life in operation. Eventually, they either can no longer generate sufficient heat or they fail mechanically, and in either case they must be replaced. Traditionally, SiC heating element power supplies have been designed to supply full-rated power even if the element increases in resistance to four times the new element resistance (a 300% resistance increase). Practically speaking, such a high resistance increase is seldom reached. An allowance for a factor of two to three increases (100-200%) is usually sufficient.
Advantages:
· Available in a wide range of shapes and sizes
· Self-supporting, they can be used in furnaces that are too wide or too long to be spanned by metallic or MoSi2 heating elements
· Capable of higher operating temperatures and higher watt loadings than metallic elements
· Relatively easy to change while the furnace is hot
STA sic heating element has ED DB U W SCR and SGR Etc type ,The resistance of sic heater varies highly non-linear manner vs. temperature for all SiC elements, and the industry standard is to report this number at a temperature ~800C to 1000C.
