Effect of Sintering Additive Composition on the Mechanical and Tribological Properties of Si3N4/SiC Ceramics

doi:10.15541/jim20140181

Abstract

Abstract:

Two compositions of the Y₂O₃-Al₂O₃(YA) and Y₂O₃-MgO (YM) systems were chosen to investigate the effect of sintering additive composition on the mechanical and tribological properties of gas pressure sintered Si₃N₄/SiC ceramics. The relative density, flexural strength, fracture toughness, hardness, coefficient of friction and wear rate were verified to depend substantially on the sintering additive composition. Compared with YM, the Si₃N₄/SiC ceramics with YA exhibit superior sinterability and show preferable mechanical and tribological properties, especially for the Si₃N₄/SiC ceramics with 20wt% SiC addition. These properties can be primarily attributed to the higher relative density and the grain size with smaller aspect ratio.

Key words: Si3N4/SiC ceramics, sintering additive, flexural strength, tribological properties

CLC Number:

TQ174

HU Hai-Long, ZENG Yu-Ping, ZUO Kai-Hui, XIA Yong-Feng, YAO Dong-Xu. Effect of Sintering Additive Composition on the Mechanical and Tribological Properties of Si₃N₄/SiC Ceramics[J]. Journal of Inorganic Materials, 2014, 29(8): 885-890.

Figures/Tables 9

Fig. 1 XRD patterns of the sintered Si3N4/SiC ceramics with different sintering additives for various contents of SiC addition (a) With YA sintering additive; (b) With YM sintering additive

Fig. 2 Relative density of the sintered Si3N4/SiC ceramics with YA or YM sintering additive for various contents of SiC

Fig. 3 SEM fracture morphologies of the sintered Si3N4/SiC ceramics with YA sintering additive for (a) without SiC, (b) 20wt% SiC, (c) 40wt% SiC and (d) 60wt% SiC addition

Fig. 4 SEM fracture morphologies of the sintered Si3N4/SiC ceramics with YM sintering additive for (a) without SiC, (b) 20wt% SiC, (c) 40wt% SiC and (d) 60wt% SiC addition

Fig. 5 Flexural strength of the sintered Si3N4/SiC ceramics with YA or YM sintering additive for various contents of SiC

Fig. 6 SEM images of worn surface of the sintered Si3N4/SiC ceramics with YA sintering additive for (a) without SiC, (b) 20wt% SiC, (c) 40wt% SiC and (d) 60wt% SiC addition

Fig. 7 SEM images of worn surface of the sintered Si3N4/SiC ceramics with YM sintering additive for (a) without SiC, (b) 20wt% SiC, (c) 40wt% SiC and(d) 60wt% SiC addition

Fig. 8 Average coefficient of friction and wear rate of the sintered Si3N4/SiC ceramics with YA or YM sintering additive

Table 1 Elastic modulus, hardness and fracture toughness of the sintered Si3N4/SiC ceramics with YA or YM sintering <br/>additive for various contents of SiC

Samples	Elastic modulus/GPa	Hardness/GPa	Fracture toughness/(MPa•m^½)
YA	271	10.8±0.24	4.02±0.03
YA-20wt%SiC	311	14.6±0.10	4.12±0.01
YA-40wt%SiC	272	13.5±0.39	3.92±0.22
YA-60wt%SiC	251	11.8±0.35	3.93±0.02
YM	187	5.8±0.14	4.06±0.04
YM-20wt%SiC	242	10.3±0.39	4.93±0.13
YM-40wt%SiC	176	5.8±0.20	4.24±0.04
YM-60wt%SiC	142	3.6±0.15	2.92±0.12

References 21

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Effect of Sintering Additive Composition on the Mechanical and Tribological Properties of Si₃N₄/SiC Ceramics

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