An auxiliary heat preservation device for microwave sintering

Abstract

The invention belongs to the field of microwave sintering, and particularly relates to an auxiliary heat insulation device for microwave sintering. From outside to inside, the device includes: polycrystalline mullite high temperature fiber cotton layer, mullite fiber box and boron nitride crucible; fiber cotton is filled between the crucible and the mullite fiber box, and the outer layer of the mullite fiber box is wrapped There is a polycrystalline mullite high-temperature fiber cotton layer, and a temperature measuring hole is arranged in the center of the upper cover plate of the mullite fiber box; the boron nitride crucible includes a crucible body and a crucible cover, and there is a boron nitride ring inside the crucible body. The gap between the boron ring and the boron nitride crucible and the interior of the boron nitride ring are filled with silicon nitride powder, the sintered sample is placed in the center of the boron nitride ring, and the powder is buried in the silicon nitride powder for sintering; the center of the crucible cover is provided with Inverted funnel through hole. Based on the wave-absorbing and wave-transmitting properties of different materials in the device, the device can play an excellent role in thermal insulation and auxiliary heat during microwave sintering; and the funnel-shaped temperature measuring hole in the crucible cover is conducive to thermal insulation and discharge of samples during the sintering process. Volatile glue.

Description

technical field [0001] The invention belongs to the field of microwave sintering, and in particular relates to an auxiliary heat preservation device for microwave sintering. Background technique [0002] Microwave sintering is a sintering method introduced in the 1970s. Its biggest feature is to use microwave energy to heat the sintered material as a whole. Because of the overall heating, the material is heated evenly and the temperature gradient is small. The properties of the sintered material are uniform and crystallized. The particles are small and compact. In addition, microwave sintering also has the characteristics of high efficiency, energy saving, and environmental protection, and can achieve structures and properties that cannot be achieved by traditional sintering methods. However, the sintering temperature of some materials (such as ceramic materials) is high, and the microwave absorption performance is poor at low temperatures. Therefore, the design of the ther...

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Problems solved by technology

However, in this device, the area between the crucible and the bottom insulation brick is filled with insulation cotton. During the sintering process, the surrounding temperature of the crucible is relatively high. After several times of use, the local high temperature of the crucible will soften the surrounding insulation cotton, causing the crucible to collapse and affecting the sintering process. , and all insulation cotton needs to be replaced before it can be used again, and the replacement cost is high

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