Concept
Electric heating elements are components that convert electrical energy into thermal energy and are the heart of electric heaters. According to their materials, they can be divided into two types: metal electric heating elements and non-metal electric heating elements: metal electric heating elements such as nickel-chromium wire (Ni-Cr), iron-chromium-aluminum wire (Fe-Cr-Al), etc., non-metal electric heating elements include silicon carbide, silicon-molybdenum rods, PTC electric heating elements, electric heating coatings, etc.
Next, let's take a look at the advantages of "silicon-molybdenum rods and silicon-carbon rods."
Silicon-carbon rod electric heating elements
Silicon-carbon rods can be distributed around the furnace, up and down, left and right. Carbon rods made of high-quality silicon carbide raw materials are processed and processed. After high-temperature siliconization, they are crystallized and formed into rod-shaped objects and non-metallic high-temperature electric heating elements. Compared with metal electric heating elements, this element has enhanced operating temperature, is very resistant to oxidation, has a long life, is resistant to corrosion and slight deformation, and is very convenient to install and maintain. Although silicon carbon rods have many advantages over metal heating elements, they cannot be used on all occasions. Generally, silicon carbon rods are used when the temperature is above 1000 degrees, and metal heating elements are used when the temperature is low. Metal heating elements are cheaper.
Silicon-molybdenum rod heating element
Silicon-molybdenum rod heating element is a high-temperature resistant and oxidation-resistant resistance heating element made on the basis of molybdenum disilicide. In an oxidizing atmosphere, the highest operating temperature is about 1700℃, and a dense quartz glass film will be formed on its appearance, which can keep the product from oxidizing. In normal circumstances, the resistance of the element does not vary with the length of use time, so new and old silicon-molybdenum rod heating elements can be mixed. The mechanical properties of silicon-molybdenum rod elements are similar to other ceramic products. At room temperature, they are brittle materials and are very easy to break, but proper and reasonable installation and use can avoid them.
Nine factors affecting the service life of molybdenum disilicide heating elements
Molybdenum disilicide heating elements are resistance heating elements based on molybdenum silicide. When heated to a high temperature in an oxidizing atmosphere, a dense glass oxide film can be formed on its surface so that it will no longer be oxidized. So far, it is commonly used in industries like steel metallurgy, glass, ceramics, and laboratory kilns.
When the molybdenum disilicide heating element is used continuously in the air, its resistance remains completely unchanged. Theoretically, it can be used continuously for many years. But in fact, many other factors shorten its service life, and even under ideal conditions, it is difficult to predict the life of the components. Common factors affecting its life are as follows:
1. Firing products. For example, the service life of firing special glass is different from that of the reflective material industry and the magnetic material industry. The magnetic material industry has a long service life and less special glass.
2. Product quality. Raw materials and manufacturing processes determine product quality.
3. The quality of the furnace. A great quality furnace can increase the service life of the components.
4. Surface problems. If used at 1800 for a long time, problems such as falling blocks and bubbling will occur on the surface, destroying the protective effect of the silicon dioxide oxide film on the surface of the silicon molybdenum rod, thereby shortening its life.
5. Dimension tolerance. The accuracy of the hot end size will affect the precise control of the electric furnace temperature directly. When there is a tolerance in the diameter, the cross-sectional part and impedance value will also change, and the calorific value of the electric heating element will also change. This means that the uniformity within the electric furnace or the use life of the electric heating element will be greatly affected.
6. Furnace operator. Excessive power or overheating will damage the heating element product.
7. Product contamination. Or the atmosphere of the product reacts with the protective glaze, causing the parts to deteriorate.
8. Insulation problems. The insulation layer is too tight, the insulation layer is damaged by displacement, or the insulator contacts are overheated.
9. Mechanical force. Heat softens and may deform, depending on the direction they are placed in the furnace.
Supplier
TRUNNANO is a globally recognized manufacturer and supplier of compounds with more than 12 years of expertise in the highest quality nanomaterials and other chemicals. The company develops a variety of powder materials and chemicals. Provide OEM service. If you need high quality Molybdenum Silicide MoSi2 Powder CAS 12136-78-6, please feel free to contact us. You can click on the product to contact us.
