Tribological Behavior of Vacuum Plasma Sprayed B4C-Mo Composite Coating

doi:10.15541/jim20150384

Abstract

Abstract:

A B₄C-Mo composite coating was fabricated using a vacuum plasma spray technique, and its wear behavior was compared with that of a pure B₄C coating. The microstructure of the composite coating was much more homogeneous and compact as a result of the formation of a (B, Mo) C transition phase, which effectively improved the interface between B₄C and Mo splats. For this reason, the wear resistance of the composite coating was much superior to that of the pure B₄C coating. The distribution of nano-sized Mo in the composite coating might also contribute to the improved tribological properties.

Key words: B4C-Mo composite coating, tribological behavior, vacuum plasma spray

CLC Number:

TG174

LIN Chu-Cheng, KONG Ming-Guang, ZHU Hui-Ying, HUANG Li-Ping, ZHENG Xue-Bin, ZENG Yi. Tribological Behavior of Vacuum Plasma Sprayed B₄C-Mo Composite Coating[J]. Journal of Inorganic Materials, 2016, 31(1): 100-106.

Figures/Tables 9

Table 1 Vacuum plasma spraying parameters

Parameters	B₄C	B₄C-Mo
Current/A	600	600
Ar gas flow/slpm	37	40
H₂ gas flow/slpm	13	10
Powder feed rate/(r·min^-1)	22	20
Spray distance/mm	220	200
Pressure/(×10², Pa)	400	400
Temperature of the stainless steel substrate/K	520-620	520-620

Fig. 1 XRD patterns of as-sprayed coatings

Fig. 2 SEM micrographs of (a, c) B4C coating and (b, d) B4C-Mo composite coating; (a, b) surface morphologies and (c, d) cross-sectional morphologies

Fig. 3 TEM micrographs of (a) columnar grains and (b) interface between B4C and Mo splats in the composite coating

Fig. 4 TEM images showing the different morphologies of the (a) B4C coating and (b-f) B4C-Mo composite coating

Fig. 5 Friction coefficients depending on sliding time of (a) the B4C/WC-Co alloy friction pair and (b) the B4C-Mo/WC-Co alloy friction pair under different loads; (c) comparison of volume wear rates between B4C and B4C-Mo composite coatings under different loads

Fig. 6 SEM images showing the morphologies of worn surfaces after sliding against a WC-Co ball for 1800 s with an applied load of 20 N

Fig. 7 SEM micrographs of wear debris obtained for (a) B4C and (b) B4C-Mo coatings

Fig. 8 Comparison of surface morphologies for the B4C-Mo composite coating (a, b) before and (c, d) after the wear test under an applied load of 50 N; (a, c) SEM micrographs and (b, d) corresponding EDS mapping of Mo

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Tribological Behavior of Vacuum Plasma Sprayed B₄C-Mo Composite Coating

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