Title:
PREPARATION METHOD FOR SILICON NITRIDE-BASED MULTIPHASE CONDUCTIVE CERAMIC
Document Type and Number:
WIPO Patent Application WO/2022/166598
Kind Code:
A1
Abstract:
Provided in the present invention is a preparation method for a silicon nitride-based multiphase conductive ceramic. In the present invention, silicon nitride is used as a matrix, a conductive phase and a sintering aid are added simultaneously, and a two-step microwave sintering method is used; the prepared silicon nitride-based multiphase conductive ceramic has fine uniform grains with a high density, and the mechanical properties thereof such as strength and hardness are also significantly improved. The two-step microwave sintering method used in the present invention can inhibit grain boundary migration and, by using grain boundary diffusion, the green body can be densified; thus, the present method not only inhibits the growth of grains at the later stage of sintering, but will also not affect densification. The embodiment results show that the relative density of the silicon nitride-based multiphase conductive ceramic provided in the present invention is greater than 99%, the Vickers hardness is greater than 15 GPa, the fracture toughness is greater than 6 MPa·m1/2, the bending strength is greater than 900 MPa, and the resistivity is less than 1Ω·cm.
Inventors:
ZHANG WEIRU (CN)
ZHANG JING (CN)
SUN FENG (CN)
DONG TINGXIA (CN)
LI ZEKUN (CN)
LI HONGHAO (CN)
XU JINMENG (CN)
JING HE (CN)
LV PEIYUAN (CN)
ZHANG JING (CN)
SUN FENG (CN)
DONG TINGXIA (CN)
LI ZEKUN (CN)
LI HONGHAO (CN)
XU JINMENG (CN)
JING HE (CN)
LV PEIYUAN (CN)
Application Number:
PCT/CN2022/072864
Publication Date:
August 11, 2022
Filing Date:
January 20, 2022
Export Citation:
Assignee:
SINOMA ADVANCED NITRIDE CERAM CO LTD (CN)
International Classes:
C04B35/584; C04B35/64
Foreign References:
| CN112851365A | 2021-05-28 | |||
| CN106810264A | 2017-06-09 | |||
| CN104817327A | 2015-08-05 | |||
| CN111635236A | 2020-09-08 |
Other References:
GUO WEI-MING, GU SHANG-XIAN;SU GUO-KANG;LI JING-XI;LIN HUA-TAI;WU SHANG-HUA: "Research Progress of Electroconductive Si3N4-Based Ceramics)", ADVANCED CERAMICS, vol. 37, no. 2, 15 April 2016 (2016-04-15), pages 94 - 106, XP055957326, ISSN: 1005-1198
Attorney, Agent or Firm:
BEIJING GAOWO LAW FIRM (CN)
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