Characteristics of Sintering Furnaces

A carborundum sintering furnace is a furnace in which the heated item is sintered protectively in a vacuum environment. It can be heated in a relatively large number of ways. For example, resistance heating, induction heating, microwave heating, etc. A carborundum sintering furnace is a furnace that uses induction heating for the protective sintering of heated items and can be divided into types such as industrial frequency, medium frequency, and high frequency. This can be classified under the sub-category of vacuum sintering furnaces. The following will introduce the characteristics of the carborundum sintering furnace bar!

Here is the content list:

• Advantages of sintering furnaces

• Special features of sintering furnaces

Advantages of sintering furnaces

Carborundum sintering furnace reduce the negative effects of harmful components (water, oxygen, nitrogen) in the atmosphere on the product. For example, it is very difficult to reduce the water content of electrolytic hydrogen to the dew point of minus 4 °C. In contrast, the vacuum level in the carborundum sintering furnace only 133 Pa, which corresponds to a dew point of minus 4 °C.

Vacuum sintering can be used for materials where a reducing or inert gas is not suitable as a maintenance atmosphere (e.g., sintering of active metals) or where decarburization or carburization is likely to occur. The vacuum of the carborundum sintering furnace improves the moistness of the liquid phase to the solid phase. This facilitates shortening and improves the arrangement of the alloy. The sintering furnace facilitates the removal of impurities such as silicon, aluminum, magnesium， and calcium or their oxygenates, which has the effect of purifying the material.

The vacuum of the carborundum sintering furnace facilitates the removal of adsorbed gases, residual gases in the pores, and reaction gas products, which has a significant effect on promoting shortening in the later stages of sintering. For example, the porosity of cemented carbide in a vacuum sintering furnace is significantly lower than that of cemented carbide sintered in hydrogen. The vacuum carborundum sintering furnace temperature is somewhat lower than that of gas maintenance sintering. This helps to reduce energy consumption and prevent grain growth. In vacuum sintering furnaces, the evaporation of metal is often lost. For example, evaporation loss of drill occurs when sintering carbide. By strictly controlling the vacuum level, even if the pressure in the furnace is not lower than the vapor pressure of the sintered metal components, the evaporation loss of metal from the carborundum sintering furnace can be greatly reduced or avoided.

Special features of sintering furnaces

Carborundum sintering furnace are a method of sintering objects at the top of the furnace with a certain amount of gas. The selection of the appropriate atmosphere for the sintering of different materials facilitates the sintering process and improves the fineness of the product.  Vacuum atmosphere furnaces usually use various atmospheres, such as vacuum, hydrogen, oxygen, nitrogen, and lethargic gases (e.g., argon). For example, transparent alumina ceramics can be sintered in a hydrogen atmosphere, transparent ferroelectric ceramics should be sintered in an oxygen atmosphere and nitride ceramics such as aluminum nitride should be sintered in a nitrogen atmosphere. Sometimes it is also necessary to operate in a maintenance atmosphere to maintain the sintering cooperation of the carborundum sintering furnace. For example, molybdenum wire furnaces should be coupled to hydrogen, and tungsten wire furnaces should be operated under a vacuum.

Hunan Jingtan Automation Equipment Co., LTD. is a professional engaged in high-temperature thermal equipment research. The main products are vapor deposition furnaces, high-temperature Graphitization furnaces, vacuum carbonization furnaces, vacuum hot-pressure sintering furnace, vacuum induction melting furnaces, etc.  You are welcome to place an order upon request.