Effect of Content and Particle Size of MgO on Liquid-phase Sintering Behavior and Mechanical Properties of Si3 N4 -Y2 O3 -MgO Ceramics

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Effect of Content and Particle Size of MgO on Liquid-phase Sintering Behavior and Mechanical Properties of Si3 N4 -Y2 O3 -MgO Ceramics

Release Time:

2022-11-10

Author:

Jin wu

Pageviews:

657

Abstract: The effects of MgO content and particle size on the density，phase composition，microstructure and mechanical properties of Si3 N4 -Y2 O3 -MgO liquid phase sintering system were investigated systematically in the present work．Ｒesults show that the effect of liquid phase could be more important due to the increase of MgO content，thus resulting in enhancing the final density of material and promoting the coarsening growth of β-Si3N4 grains． When the liquid phase content was the same but MgO particle size increased，the final density and aspect ratio of β-Si3N4 grains simultaneously tended to diminish． It is found that the MgO particle size has significant influence on the formation and distribution of liquid phase，hence affects the wettability，particle rearrangement and mass transfer during liquid phase sintering process． The relative density，fracture toughness and Vickers hardness reached maximum values of 99． 5% ± 0． 2% ，( 6． 9 ± 0． 6 ) MPa· m1 /2 and ( 18． 7 ± 0． 1 ) GPa，respectively at a MgO adding level of 4wt% and a particle size of 0． 1 μm．

Our GFS-1 high dispersion magnesium oxide, purity ≥99.95%, less impurities, especially low sodium content. The crystalline form has complete crystal appearance, narrow particle size distribution, and has high dispersion when mixed with solvents or other powders.