ZHENGZHOU SONGYU HIGH TEMPERATURE TECHNOLOGY CO.,LTD

Working Principle Of SIC Heating Elements

  The working principle of silicon carbon rods is based on the semiconductor characteristics and physical and chemical properties of its main raw material, high-purity silicon carbide. From the perspective of conductivity, silicon carbide is a wide bandgap semiconductor. At room temperature, there are few free carriers and high resistance. After power is turned on, electrons absorb energy and jump to the conduction band to form current. Lattice vibration assists electron migration to reduce resistance, and when the temperature rises, the bandgap width decreases. The increase in carrier concentration causes the resistance to change with a negative temperature coefficient. In terms of the heating mechanism, following Joule's law, when current passes through the silicon carbon rod, the collision between the carrier and the lattice generates heat.   During the working process, different temperature stages show different characteristics: the resistance slowly decreases from room temperature to 400℃; the resistance decreases significantly from 400-700℃ and the oxidation rate accelerates, which requires rapid temperature rise to cross; above 700℃, a dense silicon dioxide protective film is formed on the surface, the oxidation rate slows down, and enters a stable working area. To ensure power stability, an adjustable transformer or thyristor power regulator is required to adjust the voltage in real time according to the temperature. In addition, the high thermal conductivity of the silicon carbon rod allows its heat to be quickly transferred to the surface, thereby heating the heated object through radiation and convection. The self-generated silicon dioxide protective film on its surface can prevent oxygen from penetrating and extend its service life. However, when the resistance increases abnormally, thermal stress causes mechanical fracture, or chemical corrosion destroys the oxide film, the silicon carbon rod will fail.

The research on polymer-based composite materials won the first prize of Anhui Science and Technology Progress Award

  The results of the Anhui Science and Technology Progress Award were announced, and the project "Key Technologies and Industrialization of Waterborne/Solvent-free Polyurethane Composite Materials" in which Professor Qian Jiasheng and Professor Xia Ru participated won the first prize. The project team innovatively developed key technologies for the synthesis of bio-based solvent-free and waterborne polyurethane resins and key technologies for coating interface regulation, and overcame the global industry's common key technical bottlenecks in the difficulty of balancing the environmental protection, durability and functionality of polyurethane synthetic leather composite materials.

China Composites Innovation and Corporate Sustainable Development Conference Concludes

  On June 10, 2025, the two-day "China Composites Innovation and Enterprise Sustainable Development Conference" was successfully concluded at the Hyatt Regency Songjiang, Shanghai. More than 300 industry elites, experts, scholars, and corporate representatives from around the world discussed the theme of "Composites Innovation New Quality Productivity and Enterprise Sustainable Development", analyzed the new development trend of the industry, judged future opportunities and challenges, and discussed new ideas and new paths for the composites industry to cultivate new quality productivity and sustainable development.

The 2025 Amorphous Nanocrystalline Alloy Industry Development Conference was held in Shanghai

  On June 11, the 2025 Amorphous Nanocrystalline Alloy Industry Development Conference was held at the Shanghai New International Expo Center. Nearly 100 well-known experts, scientific researchers, and corporate representatives from the fields of amorphous nanocrystalline and upstream and downstream industrial chains across the country gathered in Shanghai to discuss and exchange the latest research results, new processes, and new market expansion layout in the field of amorphous nanocrystalline. Many experts gave wonderful reports at the meeting, covering the innovation of soft magnetic materials, analysis of the amorphous alloy material industry, and the development of the magnetic material industry.

What is a porcelain furnace?

  A porcelain furnace is a device specially used for making dental restorations. It is mainly used for high-temperature sintering of ceramic materials to make crowns, bridges, veneers, etc.     Its working principle is to sinter the ceramic material and achieve the desired strength, durability and aesthetic effect through precise temperature control. Porcelain furnace plays an important role in the field of dentistry, which can produce highly precise and natural-looking dental restorations.     More specifically, a porcelain furnace is usually composed of a furnace cover, a grill, a lifting platform, and an operating panel, and can be used at a maximum temperature of 1200°C. The core function of a porcelain furnace is to sinter porcelain powder at high temperatures to produce dental restorations such as crowns, bridges, and veneers. The precise temperature control and rapid temperature rise characteristics of the porcelain furnace (for example, it takes only 7 minutes from room temperature to 1000°C and 10 minutes to 1200°C) ensure the efficiency and reliability of the porcelain process.     In addition, there are many types of porcelain furnaces, including manual, semi-automatic and fully automatic types, to meet different workflow requirements. With the application of infrared technology, the porcelain process has become more efficient, economical and environmentally friendly. The selection of porcelain furnaces needs to consider factors such as the type of porcelain, the required firing temperature, etc. to ensure the quality and effect of dental restorations.

Which materials can be used as heating elements?

  Heating elements are key components in a variety of industrial and laboratory applications, and choosing the right material is critical for efficiency, durability, and performance. Molybdenum disilicide (MoSi2) is one of the most advanced heating element materials, with unique advantages such as high operating temperature, stable resistance, and long life. However, it also has certain disadvantages, including higher cost and the need for specialized power control equipment 翻译结果    Advantages of MoSi2 Heating Elements High Operating Temperatures: MoSi2 heating elements can withstand the highest operating temperatures among similar materials, making them ideal for applications requiring extreme heat. Resistance Stability: Their resistance remains stable over time, allowing new and old elements to be connected in series without degradation. Rapid Thermal Cycling: MoSi2 elements can undergo rapid heating and cooling cycles without degradation, ensuring consistent performance in dynamic environments. 1.Easy Replacement: These elements can be replaced even when the furnace is hot, minimizing downtime in industrial processes. 2.Long Life: MoSi2 heating elements have the longest inherent life among electrical heating elements, reducing replacement frequency and maintenance costs. 3.Versatility: They come in a variety of shapes and sizes to accommodate a wide range of furnace designs and applications.    

Types of Industrial Electric Furnaces

   An electric furnace is a device that uses the heat generated by the electrothermal effect to heat materials in order to achieve the desired physical and chemical changes. For example, a steelmaking electric arc furnace is a device with a furnace body and a hearth, in which the arc discharge effect is used to convert electrical energy into thermal energy to achieve the melting process of the charge.     There are many types of electric furnaces in the industry and they are widely used. For the convenience of naming and discussion, electric furnaces are classified according to their characteristics:   (1) According to the electric heating method: resistance furnace, induction furnace, arc furnace, plasma furnace, electron beam furnace, dielectric (microwave) heating equipment; (2) According to the heating method: radiation type, convection type, conduction type; (3) According to the atmosphere in the furnace: ordinary atmosphere, controlled atmosphere, vacuum furnace; (4) According to the characteristics of the furnace body structure: vertical, horizontal, chamber, straight-through, box, well, annular, hood, melting pool furnace, crucible furnace, melting groove furnace, solidification shell furnace, etc.; (5) According to the material conveying method: push type, roller bottom type, crawler type, stepping type, trolley type, etc.; (6) According to the operation mode: intermittent type, continuous type; (7) According to the characteristics of the power supply: DC, AC (industrial frequency, medium frequency, high frequency); (8) According to the purpose of heating: melting, rolling, casting and forging, heat treatment, drying, etc.     Resistance furnaces include trolley resistance furnaces, double trolley resistance furnaces, box resistance furnaces, pit resistance furnaces and large trolley furnaces.  

What is SIC Heating Element?

Silicon carbide (SiC) is a high-performance ceramic material with high thermal conductivity, high hardness and excellent corrosion resistance.   Based on these characteristics, silicon carbide heat exchangers have shown unique advantages in the pharmaceutical, chemical, food processing and other industries.   Compared with traditional metal heat exchangers, silicon carbide heat exchangers can not only effectively improve heat exchange efficiency, but also significantly reduce equipment maintenance costs and service life.