The Effect of Si contents on the reaction-bonded Si3N4/SiC composite ceramics

2nd International Conference on Competitive Materials and Technological Processes

Li, J.^1 ; Yuan, W.J.^1 ; Deng, C.J.^1 ; Zhu, H.X.^1

State Key Laboratory Breeding Base of Refractories and Ceramics, Wuhan University of Science and Technology, Wuhan, China^1

关键词: Bulk density;    Composite ceramic;    Microstructure and mechanical properties;    Nitrogen atmospheres;    Pressureless;    Reaction-bonded;    SiC powder;    Sintering additives;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/47/1/012060/pdf
DOI  :  10.1088/1757-899X/47/1/012060

来源: IOP

【 摘 要 】

Effect of Si contents on reaction-bonded Si3N4/SiC composite ceramics under pressureless was investigated. Si3N4/SiC composite ceramics were sintered at 1600 °C under nitrogen atmosphere by using SiC powders (1.5μm), Si powders (74μm) with different contents 37∼55wt% and sintering additives Y2O3as raw materials. The phases, microstructure and mechanical property were characterized by XRD, SEM, and compressive strength tests. The results demonstrated that when the content of Si powders was 37wt%, the more dense samples with the bulk density of 2.41 g/cm3and the higher compressive strength of 319 MPa could be obtained under pressureless.