Title:
SI3N4 GRADIENT MATERIAL AND PREPARATION METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2019/134354
Kind Code:
A1
Abstract:
A method for preparing a Si3N4 gradient material is provided, comprising steps of: a) providing a mixed powder A and a mixed powder B, and the mixed powder A comprises a Si powder, a TiO2 powder and a sintering aid, and the sintering aid is composed of Al2O3 and Re2O3 in a molar ratio of less than or equal to 1, and the mixed powder B comprises Si, TiO2 and a sintering aid, and the sintering aid is composed of Al2O3 and Re2O3 in a molar ratio greater than 1. Re is selected from Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, or Lu; b) alternatively paving the mixed powder A and the mixed powder B to form a multilayer structure, and press-forming to obtain a body; c) nitriding the body obtained in step b) and sintering to obtain a Si3N4 gradient material. The method allows control of a β-silicon nitride/α-silicon nitride in a nitriding stage by means of controlling the ratio of Al2O3 to Re2O3 in a sintering aid. The obtained Si3N4 gradient material has a strong bonding strength between gradient layers, excellent mechanical properties with surface hardness and core toughness. A Si3N4 gradient material prepared by the method is also provided.
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Inventors:
GUO WEIMING (CN)
WU LIXIANG (CN)
NIU WENBIN (CN)
LIN HUATAY (CN)
WU LIXIANG (CN)
NIU WENBIN (CN)
LIN HUATAY (CN)
Application Number:
PCT/CN2018/093666
Publication Date:
July 11, 2019
Filing Date:
June 29, 2018
Export Citation:
Assignee:
UNIV GUANGDONG TECHNOLOGY (CN)
International Classes:
C04B35/591; C04B35/622; C04B35/64
Foreign References:
| CN108046808A | 2018-05-18 | |||
| CN104909765A | 2015-09-16 | |||
| CN102320170A | 2012-01-18 | |||
| CN101486578A | 2009-07-22 | |||
| CN106904977A | 2017-06-30 | |||
| CN104163633A | 2014-11-26 |
Other References:
ZHENG, GUANGMING: "Fabrication and High Speed Cutting Performance of Sialon-Si3N4Graded Nano- composite Ceramic Tools", CHINA DOCTORAL DISSERTATIONS FULL-TEXT DATABASE, ENGINEERING SCIENCE AND TECHNOLOGY, vol. I, no. 12, 15 January 2013 (2013-01-15)
GUO, WEIMING ET AL.: "Effect of Ti02 Additives on Nitridation of Si Powders", MATERIALS LETTERS, vol. 177, 15 August 2016 (2016-08-15), pages 61 - 63
GUO, WEIMING ET AL.: "Effect of Ti02 Additives on Nitridation of Si Powders", MATERIALS LETTERS, vol. 177, 15 August 2016 (2016-08-15), pages 61 - 63
Attorney, Agent or Firm:
JIAQUAN IP LAW FIRM (CN)
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