Ultrahigh temperature ceramic and hot-press sintering method thereof

CN121044915BActive Publication Date: 2026-05-29SHAANXI SCI TECH UNIV

View PDF 2 Cites 0 Cited by

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: SHAANXI SCI TECH UNIV
Filing Date: 2025-10-30
Publication Date: 2026-05-29

AI Technical Summary

Technical Problem

Existing technologies make it difficult to prepare high-density ultra-high temperature ceramics in a short time. Traditional hot pressing sintering methods are inefficient and the material properties deteriorate under high temperature for a long time. Other methods, such as flash sintering and ultrafast high temperature sintering, have problems such as high cost and difficulty in preparing dense ceramics.

Method used

By employing alternating multi-layer molds of graphite and boron nitride, the inner graphite mold is heated by passing direct current through it to generate Joule heating, while the middle boron nitride mold isolates the heat. Combining segmented and integral mold designs, rapid heating and pressure sintering are achieved to prepare high-density ultra-high temperature ceramics.

Benefits of technology

It achieves rapid heating and densification of ultra-high temperature ceramics, with a heating rate of up to 103℃/min, and can prepare highly dense bulk ceramics within minutes. It is applicable to a variety of ultra-high temperature ceramic material systems and meets the needs of high-end fields such as aerospace.

✦ Generated by Eureka AI based on patent content.

Smart Images

Figure CN121044915B_ABST

Patent Text Reader

Abstract

The application discloses an ultrahigh-temperature ceramic and a hot-pressing sintering preparation method thereof, and belongs to the technical field of ultrahigh-temperature ceramic matrix composite materials, and the method comprises the following steps: preparing an alternating multilayer mold of graphite and boron nitride, wherein the alternating multilayer mold of graphite and boron nitride comprises an inner graphite mold, a middle boron nitride mold and an outer graphite mold; when in use, a pre-sintered body is loaded into the inner graphite mold, pressure is applied under vacuum, and an electric current is applied to the inner graphite mold; the pre-sintered body is heated to 1000-2400 DEG C by using the generated Joule heat, and after heat preservation and reaction for 1-5 min, a bulk ultrahigh-temperature ceramic is obtained. Through high current density, rapid heating is realized, and at the same time, pressure is applied, so that the ultrahigh-temperature ceramic composite powder is rapidly hot-pressed and sintered into a bulk ultrahigh-temperature ceramic. The method can realize high-throughput search and research of an ultrahigh-temperature ceramic material system, has good universality, and can rapidly prepare a dense large-size bulk ultrahigh-temperature ceramic.

Need to check novelty before this filing date? Find Prior Art