Thermal insulation device for microwave sintering of titanium carbonitride-based metal ceramic material

Abstract

The invention relates to a heat preservation device for microwave sintering of a titanium carbonitride-based metal ceramic material. The heat preservation device comprises a large-size crucible, a small-size crucible, polycrystalline aluminum oxide high-temperature fibers, first polycrystalline aluminum oxide fiber cotton and a polycrystalline mullite fiber board. The small-size crucible is arranged on the inner side of the large-size crucible, the polycrystalline alumina high-temperature fiber is arranged between the small-size crucible and the large-size crucible, the first polycrystalline alumina fiber cotton is annularly arranged on the outer side of the large-size crucible, and the bottom of the large crucible is arranged on the polycrystalline mullite fiber board. The problems that heat insulation cotton is softened at high temperature, so that the position of a crucible deviates, heat loss is accelerated, and the sintering quality is reduced are solved.

Description

technical field [0001] The invention belongs to the technical field of microwave sintering, and particularly relates to a heat preservation device for microwave sintering of titanium carbonitride-based cermet materials. Background technique [0002] The disclosure of information in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] Titanium carbonitride-based cermet has now developed into an indispensable tool material in the field of industrial production, but the traditional sintering method to prepare titanium carbonitride-based cermet tool materials has the problems of long holding time and easy grain growth, etc. question. Microwave sintering is an emerging sintering technology in the 21st century. It uses the dielectric loss...

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Problems solved by technology

However, at present, microwave sintering is mostly pressureless sintering, and the rationality of the structure of the heat preservation device has a significant impact on its sintering quality and sintering efficiency. Unreasonable heat preservation devices will greatly reduce the density and mechanical properties of the sintered body

[0004] At present, the existing thermal insulation devices for microwave sintering use a large amount of high-temperature-resistant thermal insulation cotton, such as mullite fiber. During the sintering process, the heating part is in direct contact with the thermal insulation cotton, and the high temperature (1600°C) emitted will soften the surrounding thermal insulation cotton, causing The position of the crucible is shifted, which accelerates the heat loss and greatly affects the sintering quality. After use, it is basically necessary to replace all the insulation cotton before it can be used again, and the cost is high.

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