Silicon nitride ceramic for high-power electric heating element and low-temperature normal-pressure sintering method thereof

By preparing silicon nitride ceramics through low-temperature and atmospheric-pressure sintering and using nitride glass additives to form a uniform liquid phase, the problems of insufficient performance of alumina ceramics and complex and energy-intensive preparation of traditional silicon nitride ceramics have been solved. This has enabled the large-scale manufacturing of high-performance silicon nitride ceramics, meeting the high-performance requirements of fields such as new energy vehicles.

CN121449436BActive Publication Date: 2026-07-24GUANGDONG GUOYAN NEW MATERIALS CO LTD
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Patent Information

Application Number
CN202512020418.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-12-30
Publication Date
2026-07-24
Estimated Expiration
2045-12-30

AI Technical Summary

Technical Problem

Existing alumina-based metal ceramic heating elements have low bending strength and poor thermal shock resistance, making it difficult to meet the performance requirements of high power density and rapid start-stop in fields such as new energy vehicles. In addition, the traditional silicon nitride ceramic preparation process is complex and energy-intensive, which limits its large-scale application.

Method used

Silicon nitride ceramics were prepared at low temperature and ambient pressure using nitride glass sintering aids. By forming a uniform liquid phase to promote densification, the sintering temperature was reduced to 1550-1680℃, thus achieving high-performance preparation of silicon nitride ceramics.

Benefits of technology

It significantly reduces sintering energy consumption and equipment requirements, and improves the bending strength and thermal shock resistance of silicon nitride ceramics, meeting the application requirements of high power density and rapid start-up and shutdown.

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Abstract

The application discloses a low-temperature normal-pressure sintering preparation method of silicon nitride ceramic for high-power electrothermal elements, and comprises the following steps: (1) mixing silicon nitride powder and nitride glass sintering additives, wherein the amount of the silicon nitride powder is 60%-93% based on the total weight of the mixed raw materials, and the amount of the nitride glass sintering additives is 7%-40%; (2) drying the mixture obtained in the step (1) to obtain dry materials; (3) forming the dry materials obtained in the step (2) to obtain formed materials; and (4) sintering the formed materials obtained in the step (3) under normal pressure. According to the method, the sintering temperature is reduced to a low-temperature interval of 1550-1680 DEG C by using the nitride glass sintering additives, the dependence on expensive and complex hot-pressing or gas-pressure sintering equipment is eliminated, the normal-pressure sintering of high-performance silicon nitride ceramic is realized while the energy consumption and cost are significantly reduced, and a process foundation is laid for large-scale and low-cost manufacturing.
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