Effect of hBN Content on Property and Microstructure of Si3N4-hBN Composite Ceramics

doi:10.15541/jim20160425

Abstract

Abstract:

Si₃N₄-hBN composites were prepared using hot-press method with nano-scaled powder, the influence of hBN content on density, mechanical properties, tribological properties, microstructure of Si₃N₄-hBN composites were investigated. The density and mechanical properties of composites were measured by Archimedes method, three point bending method and Vickers indentation method. The tribological properties of composites were measured by friction and wear tester. The phase composition and microstructure of composites were analyzed and observed by XRD, EDAX and SEM, LSCM. The results showed that with increase of hBN content the composites’ density gradually decreased, the composites’ porosity increased at first and then stable gradually, the composites’ mechanical performance gradually decreased. The friction tests indicated that the tribological properties of Si₃N₄-hBN and GCr15, with pair under dry friction, increased at first and then decreased sharply with the increase of hBN content. The friction coefficient and wear coefficient decreased gradually when hBN content was less than 20%, and then increased sharply when the hBN content was more than 20%. The friction coefficient reaches the lowest value of 0.31 when the hBN content was about 20%. The addition of hBN influenced the mechanical and tribological properties of Si₃N₄-hBN composites through directly influenced its microstructure.

Key words: Si3N4-hBN, density, mechanical properties, microstructure, tribological properties

CLC Number:

TQ174

ZHANG Chang-Song, LIU Qiang, CHEN Wei. Effect of hBN Content on Property and Microstructure of Si₃N₄-hBN Composite Ceramics[J]. Journal of Inorganic Materials, 2017, 32(5): 509-516.

Figures/Tables 13

Table 1 Physical and mechanical properties of Si3N4-hBN composite ceramics by hot-pressed sintering

Number	HBN/ wt%	Density /(g·cm^-3)	Relative density /%	Porosity /%	Bending strength /MPa	Vickers hardness /GPa	Fracture toughness /(MPa·m^1/2)
SN0	0	3.20	97.0	0.24	818	14.9	7.36
SN5	5	3.12	96.7	0.55	764	13.3	6.67
SN10	10	3.04	96.4	0.80	717	12.4	6.58
SN20	20	2.89	96.0	1.02	695	8.9	6. 39
SN30	30	2.79	91.2	1.08	577	6.6	5.98

Fig. 1 Corrosion surface morphologies of hot-pressed Si3N4-hBN specimens (a) Pure Si3N4(SE); (b) Si3N4-20%hBN(BSE)

Table 2 Microareas elements of EDAX analysis of pure Si3N4 ceramics

Analysis area	Elements /at%
Analysis area	Si	N	O	Al	Y
“1” area	39.72	52.91	5.36	1.57	0.42

Fig. 2 XRD patterns of Si3N4-hBN ceramic composites with different hBN contents

Fig. 3 Fracture morphologies of Si3N4-hBN ceramic composites(SEM) (a) pure Si3N4; (b) Si3N4-5wt%hBN; (c) Si3N4-10wt%hBN; (d) Si3N4-20wt%hBN; (e) Si3N4-30wt%hBN

Fig. 4 Change of friction coefficient (a) and wear coefficient (b) of SN0-SN30 and GCr15 with a pair of friction surface

Fig. 5 Friction coefficient curves of SN0/GCr15 and SN20/GCr15 with time variation

Fig. 6 Friction surface morphology of the pin (a) and disc (b) specimens of SN0/GCr15 with pair

Fig. 7 EDAX elements of friction surface of pin (a) and disc (b) and XRD analysis of debris (c)

Fig. 8 3D morphology of friction surface of SN0/GCr15 with pair

Fig. 9 Friction surface morphology of the pin (a) and disk (b) specimens of SN20/GCr15 with pair

Fig. 10 3D morphology of friction surface of SN20/GCr15 with pair

Fig. 11 EDAX elements of friction surface of (a) pin, (b) disc, and XRD pattern of debris (c)

References 20

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Effect of hBN Content on Property and Microstructure of Si₃N₄-hBN Composite Ceramics

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