Corrosion Resistance and Anti-wear Property of Nickel Based Abradable Sealing Coating Deposited by Plasma Spraying

doi:10.15541/jim20150566

Abstract

Abstract:

High-efficiency supersonic atmospheric plasma spraying was used to fabricate Ni-C and NiCrAl-BN abradable seal coatings. The erosion wear, corrosion resistance and wear resistance of plasma-sprayed coatings were comparatively studied．Experimental results showed that the libricating phases were homogeneously distributed in the as-sprayed coatings while their average size of the coating was much fine compared with Ni-C coating, and the former also showed higher surface hardness than the latter. Meanwhile, it was found that the erosive mass loss increased with the increase of impingement angle from 30° to 90° and the relative erosion rate of NiCrAl-BN coating was only a half of that of Ni-C coating. Due to the formation of corrosion product around the flake graphite, the corrosion resistance of NiCrAl-BN coating was better than Ni-C coating in dilute hydrochloric acid (1vol%). However, the hydrochloric acid could permeate the NiCrAl-BN coating through the pores, which resulted in the localized corrosion of metal phases. In addition, we also observed that the friction coefficient of NiCrAl-BN coating significantly decreased from room temperature to 400℃ owing to the formation of large-scale self-lubricating film that resulted from the improvement of plasticity and fluidity of BN.

Key words: abradable seal coating, supersonic atmospheric plasma spraying, erosion, corrosion, friction and wear

CLC Number:

TM205

YU Fang-Li, BAI Yu, WU Xiu-Ying, Wang Hai-Jun, WU Jiu-Hui. Corrosion Resistance and Anti-wear Property of Nickel Based Abradable Sealing Coating Deposited by Plasma Spraying[J]. Journal of Inorganic Materials, 2016, 31(7): 687-693.

Figures/Tables 13

Table 1 Materials for abradable seal coating[12]

Material	Product mark	Composition/wt%	Density/ (g·cm^-3)
Ni-C	M 307	Ni75-C25	3.2
NiCrAl-BN	M 301	Ni60Cr14Al-BN5.5	4.4

Table 2 Spray parameters

Parameters	Ni-C	NiCrAl-BN
Current /A	200	320
Voltage /V	90	90
Primary gas, Ar /(m³·h^-1)	2.8	2.8
Carrier gas flow rate /(L·min^-1)	10	10
Carrier gas pressure / MPa	0.8	0.8
Powder feed rate /(g·min^-1)	40	48

Table 3 Parameters for erosive wear test

Parameters	Value
Distance /mm	100
Pressure /MPa	0.3
Compressed air flow rate /(m³·h^-1)	3
Inner diameter of nozzle / mm	3.6
Length of nozzle /mm	22
Particle size of abrasive particles-Brown alumina	100#

Fig. 1 Schematic of sample for corrosion test

Fig. 2 Annular (left) and disc (right) samples with deposited abradable sealing coating for wear test

Fig. 3 Ni-C feedstock powder and cross-sectional images of Ni-C as-sprayed coating(a) Feedstock powder; (b) Whole image of coating;; (c) Detailed image of coating

Fig. 4 NiCrAl-BN feedstock powder and cross-sectional images of NiCrAl-BN coating(a) Feedstock powder; (b) Whole image of coating; (c) Detailed image of coating

Fig. 5 Mass loss of coating during erosive wear

Fig. 6 Weight loss of coating after corrosion in 1vol% HCl at 90℃

Fig. 7 Cross-sectional morphology of coating after corrosion in 1vol% HCl at 90℃(a) Ni-C coating; (b) NiCrAl-BN coating

Fig. 8 Frictional coefficient of coating as a function of time at different temperatures(a) Room temperature; (b) 200℃; (c) 400℃

Fig. 9 Morphological images of wear track of NiCrAl-BN coating tested at room temperature(a) Whole image; (b) Detailed image

Fig. 10 Morphological images of wear track of NiCrAl-BN coating tested at 400℃(a) Whole image; (b) Detailed image

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