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To our customers:

As a global leading brand of MoSi2 series products, YTTORCH brand has  always been foucs on  producing high-quality MoSi2 series products, which arefavored and trusted by customers.

In recent years, there are Low quality MoSi2 heating elements  faked our brand and sold in the market, which has cause an adverse effect on our reputation, and seriously damaged the interests of the customers. In order to strengthen YTTORCH brand management and  prevent customers from being deceived and causing unnecessary losses , We call on relevan customers to purchase  through regular ways and hereby make the following statements:

“YTTORCH” brand  MoSi2 heating elements has the following characteristics of anti-counterfeiting marks:

The logo applied to the details of the product and packaging , mainly includes: torch shape image logo and “YTTORCH”  word mark .They will be marked in the  form of individual or combination on the details of the product and packaging.

we will strictly deal with the counterfeit "YTTORCH" brand behavior to ensure interests of the consumers.  our company reserves the right to pursue legal responsibility for fake behavior 

Disclaimer: The market is risky, choose carefully! This article is for reference only, not for sale basis.

MoSi2  was discovered in 1906, silicon and molybdenum under different conditions, can form MoSi3,  Mo5Si3 and MoSi2. MoSi2 can form SiO2 protective layer on the surface at high temperature to prevent further oxidation, whice has good high temperature oxidation resistance and excellent electrical conductivity. MoSi2  melting point is 2030℃,  which is  a  kind of ultra-high temperature structural material.

MoSi2 heating elements is a kind of electric heating element  based on the molybdenum disilicide  material ,  also named "MoSi2 heating rods ", "MoSi2 heater ", "MoSi2 resistance " "二矽化鉬加熱元件 ", etc.,  Its high temperature performance is excellent; It has similar properties to metals and ceramics. when it wok in the low temperature , the  MoSi2 material strength is higher, greater crisp characte (similar to ceramics). hen it wok in the low temperature  above 1000℃ ,the  MoSi2  has metal-like soft plasticity. In addition to ordinary U shape, L shape and W shape, it can also be processed into spiral shape and other special shapes.

Silicon  is a chemical element, its chemical symbol is Si, formerly known as 矽 (Taiwan China  uses the word "矽" so far), silicon is also a very common element, but it rarely appears in nature in the form of a single substance, but in the form of complex silicate orSiO2, widely present in rocks, gravel, dust. Molybdenum is a refractory rare metal, its chemical symbol is Mo, molybdenum melting point is 2620℃, due to the strong interatomic bonding force, so the strength is very high at atmospheric temperature and high temperature. It has small expansion coefficient, high conductivity and good heat-conducting property.

The early application of MoSi2 heating elements is mainly as a high temperature and corrosion resistant coating protection material on the surface of metal matrix, and it is first applied to the coating of gas turbine components, jet engine combustion chambers and missile combustion chambers. With the continuous development and innovation of technology, the application field has also been expanded to update, and is now widely used in metallurgy, steelmaking, glass, ceramics, refractory materials, crystals, electronic components, semiconductor materials research, manufacturing and other fields. Especially for the production of High Performance and high- precision ceramics, high-grade intraocular lens, high- precision structural  ceramics , glass fiber, optical fiber and high-grade alloy steel. (Such as: Muffle furnace, dental furnace, tunnel kiln, roller kiln, glass kiln, smelting furnace, diffusion furnace, etc.）

Molybdenum silicide was discovered in 1906. Silicon and molybdenum can form molybdenum silicide (MoSi3), molybdenum silicide (Mo5Si3) and molybdenum disilicide (MoSi2) under different conditions. Molybdenum disilicide can form a silicon dioxide protective layer on the surface at high temperature to prevent further oxidation. It has good high-temperature oxidation resistance and excellent electrical conductivity. Its melting point is 2030℃ and is considered to be a very promising ultra-high temperature structural material.

Molybdenum silicon rod is an electric heating element made of molybdenum disilicide material, also known as "molybdenum disilicide heating element", "molybdenum disilicide heating element", "molybdenum disilicide heating element", etc. It has excellent high-temperature performance; it has properties similar to metals and ceramics. Molybdenum disilicide materials have higher strength and greater brittleness (similar to ceramics) at low temperature, and have metal-like soft plasticity at high temperatures above 1000℃.

The silicon in silicon-molybdenum rods is a chemical element, its chemical symbol is Si, formerly known as silicon (Taiwan still uses the word "silicon" today). Silicon is also a very common element, but it rarely appears in nature in the form of a single substance, but in the form of complex silicates or silicon dioxide, widely present in rocks, gravel, and dust. The molybdenum in silicon-molybdenum rods is a refractory rare metal, its chemical symbol is Mo, and the melting point of molybdenum is 2620℃. Due to the strong bonding force between atoms, the strength is very high at both room temperature and high temperature. It has a small expansion coefficient, high conductivity, and good thermal conductivity.

The early application of silicon-molybdenum rods was mainly as a high-temperature and corrosion-resistant coating protection material for the surface of metal substrates. It was first used in the coating of gas turbine parts, jet engine combustion chambers, and missile combustion chambers. With the continuous development and innovation of technology, the application fields are also constantly expanding and updating. Now it is widely used in the research and production of metallurgy, steelmaking, glass, ceramics, refractory materials, crystals, electronic components, semiconductor materials, etc., especially for the production of high-performance precision ceramics, high-grade artificial crystals, precision structural metal ceramics, glass fiber, optical fiber and high-grade alloy steel. (Such as: muffle furnace, dental furnace, tunnel kiln, roller kiln, glass kiln, smelting furnace, diffusion furnace, etc.)

1. Low-temperature oxidation characteristics of molybdenum disilicide 

Molybdenum disilicide material has excellent high-temperature oxidation resistance, but at lower temperatures, especially 400-700 degrees, low-temperature oxidation and powdering will occur, so we should avoid long-term use of the component temperature in the range of 400-700 degrees when using it.

2. Resistance characteristics of molybdenum disilicide electric heating elements

The resistivity of molybdenum disilicide electric heating elements increases with the increase of temperature, and the resistivity at high temperature is about 10 times that at low temperature.

The resistivity of molybdenum disilicide heating elements is much smaller than that of metal heating wires, and its working state is low voltage and high current, so transformers are generally required. This poses a problem. The resistance of fixed-specification molybdenum disilicide heating elements at low temperatures is about 1/10 of that at high temperatures. If a larger voltage is directly loaded, the current will be 10 times that of the element at high temperature, which will cause a large current impact on the electronic control part and the heating element. This situation usually occurs when the electric furnace starts to supply power and heat up. When the furnace temperature cannot keep up with the set temperature, the power regulator will output the maximum power, causing the low-temperature and low-resistance heating element to load a large voltage and generate a large current (it takes a certain amount of time for the heating element to heat up). Generally, we design the low-temperature stage to control the component loading voltage not to exceed 1/3 of the working voltage, or if the current limiting function is used, the current is limited to not exceed the specified working current of the component.

Below we give an example to illustrate how to set the control parameters of the temperature control instrument. For example: an electric furnace has 9 ￠6/12 heating elements, divided into three groups of three in each group, star-connected, and the working parameters of a single element are: 10V-150A-1500W, the transformer output loads the voltage of 35V on the three heating elements, the current is 180A, and the thyristor is adjusted (power regulator). The heating system and the control parameters of the temperature control meter are set as shown in the following table.

This setting can effectively prevent large current shocks in the initial heating stage, especially after the heating element has been used for a long time, the internal structure of the heating element will change, and the brittleness will increase. If the current shock is large, the heating element will brittlely break. This setting should be more cautious.

The resistance performance of molybdenum disilicide electric heating elements does not change with the increase of use time, so new and old elements can be mixed, which can greatly reduce the user's use cost.

3. High-temperature softening characteristics of molybdenum disilicide electric heating elements

In the low-temperature stage, molybdenum disilicide materials have high strength but high brittleness (similar to ceramics), and when the temperature reaches above 1000℃, it has metal-like soft plasticity. Since molybdenum disilicide electric heating elements are all operated at higher temperatures, we should consider the influence of their soft plasticity to avoid high-temperature deformation and damage to the elements.

For example, if the element is used horizontally, the use temperature should be reduced accordingly, because the higher the temperature, the greater the soft plasticity of the element, which will cause large deformation. The support of the plate should be considered, and the heat dissipation of the element should also be considered. L-shaped elements should consider that their gravity causes deformation, which may cause the elements to touch the furnace wall and be damaged, so special attention should be paid during the design and installation stage.

4. Protective film characteristics of molybdenum disilicide electric heating elements

The surface protective film of molybdenum disilicide electric heating elements is a layer of SiO2 glass film, which can prevent the internal MoSi2 matrix material from continuing to oxidize at high temperatures. This is the high-temperature anti-oxidation characteristic of molybdenum disilicide materials. However, due to the difference in expansion coefficients between the surface SiO2 glass film and the MoSi2 matrix material, when used in an intermittent oxidizing atmosphere electric furnace, the protective film will peel off due to the difference in expansion coefficients when cooling or heating. This is also the inherent characteristic of molybdenum disilicide electric heating elements. After the SiO2 glass film falls off, it will be used again in an oxidizing atmosphere, and the surface protective film will be generated again. This is the self-healing function of the protective film.

To all partners and users:

According to user reports, there are counterfeit silicon-molybdenum rod products of our company being sold in the market, which has a negative impact on our products and reputation, and seriously damaged the interests of consumers. In order to ensure the rights and interests of consumers and enable customers to purchase genuine silicon-molybdenum rods from our company with confidence, please be sure to purchase through formal channels. For this reason, our company makes the following statement:

Our silicon-molybdenum rods have the following anti-counterfeiting marks:

The marks applied to the details of products and packaging are mainly: the word trademark "YTTORCH", and the graphic trademark and the word trademark will appear in the details of products and packaging alone or in combination.

Our company will spare no effort to resolutely crack down on the sale of counterfeit and shoddy products and protect the legitimate rights and interests of consumers. Our company reserves the right to pursue legal liability for counterfeit and shoddy products.

Torch High Temperature Ceramics Manufacturer

April 8, 2024

Disclaimer: The market is risky, and you need to be cautious when choosing! This article is for reference only and is not a basis for buying and selling.