High-temperature sintering furnace

Abstract

The invention belongs to the technical field of industrial furnaces, and particularly relates to a high-temperature sintering furnace. The high-temperature sintering furnace comprises a furnace body,a furnace cover, silicon-molybdenum rods and a furnace door for closing the furnace body, wherein the furnace door is arranged at the front end of the furnace body; the left side wall, rear wall and right side wall of the furnace body are provided with heat preservation walls connected into a whole; one side, facing the interior of the furnace body, of each heat preservation wall is provided witha separation wall; the separation walls and the furnace door jointly form a sintering chamber; and the separation walls separate the silicon-molybdenum rods from the sintering chamber. Therefore, thesilicon-molybdenum rods cannot be corroded by gas generated by sintering, the service life is long, and the service life of the silicon-molybdenum rods is prolonged by one time or more.

Description

technical field [0001] The invention belongs to the technical field of industrial furnaces, in particular to a high-temperature sintering furnace. Background technique [0002] In the high temperature sintering furnace, it is necessary to use electric heating to increase the temperature in the kiln. Silicon-molybdenum rods are often used as electric heating elements. Silicon-molybdenum rods are high-temperature-resistant and oxidation-resistant resistance heating elements based on molybdenum disilicide. When used in a high-temperature oxidizing atmosphere, a layer of bright and dense quartz (SiO 2 ) glass film, which can protect the inner layer of silicon-molybdenum rods from oxidation, so silicon-molybdenum rod components have unique high temperature oxidation resistance. [0003] However, when the high-temperature sintering furnace sinters some materials, for example, the mixture of silicon carbide particles and metal silicon powder is pressed or poured into a high-temper...

AI Technical Summary

Problems solved by technology

[0004] 1. When the materials in the kiln are sintered, impurities, binders, etc. are heated and decomposed to produce corrosive gases, which cause corrosion to silicon-molybdenum rods;

[0005] 2. When the material is sintered and replaced, the material will generate air flow during the process of entering and leaving the kiln, so that the external cold air will directly contact the silicon-molybdenum rod. When the silicon-molybdenum rod is subjected to sudden cooling, the oxide scale on the surface will shrink, resulting in the appearance of oxide scale Larger cracks cause automatic peeling, the oxidation speed of silicon molybdenum rods becomes faster, and the service life is reduced;

[0006] 3. The silicon molybdenum rod will become soft and easy to deform when heated. When it has a convex part, it is easy to be hung up when the kiln car enters and exits the nitriding furnace, resulting in poor heating effect or even unusable

The above problems directly lead to the shortened service life of silicon molybdenum rods and frequent replacement

[0007] In addition, the insulation wall is set between the silicon-molybdenum rods and the steel structure outer wall of the nitriding furnace. It is made of refractory bricks that are directly in contact with the gas in the kiln. The refractory bricks are corroded by impurity gases and will produce fine powder after heating. Or directly sublimated from solid to gas, these powders and gases will adhere to the surface of the material to be processed at a lower temperature with the flow of gas in the kiln, resulting in blackening of the product surface and poor quality. At the same time, these powders will also clog Pores on the surface of the product, nitrogen cannot be injected into the product, resulting in incomplete nitriding of the product, and the quality of the sintered product is not up to standard

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