Durability of Low Pressure Plasma Sprayed MoB/CoCr Coating on 310S Stainless Steel in Molten Al-12.07wt.%Si Alloy

A sprayed MoB/CoCr cermet coating was formed on 310S stainless steel by low pressure plasma spraying (LPPS), and its durability in the molten Al-12.07wt.%Si has been investigated by SEM、EDS and XRD. The immersion test revealed that the MoB/CoCr coating has much higher durability without dissolution in the molten Al-12.07wt.%Si alloy. Little change of crystal structure, mainly composed of ternary borides of Co2MoB2 and CoMoB, suggesting that the ternary borides have much higher durability.

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MoB/CoCr Coating by Low Pressure Plasma Spraying against Erosion by Molten Al-12.07wt.%Si Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.284-286.676 ◽

2011 ◽

Vol 284-286 ◽

pp. 676-679

Author(s):

Xiao Chen

Keyword(s):

Crystal Structure ◽

Plasma Spraying ◽

Thermal Spraying ◽

Low Pressure ◽

Immersion Test ◽

Pressure Plasma ◽

High Durability ◽

Low Pressure Plasma ◽

Novel Material ◽

Low Pressure Plasma Spraying

MoB/CoCr, a novel material for thermal spraying, with high durability is used to resist erosion by molten Al-12.07wt.%Si alloy. The durability of the MoB/CoCr coating prepared by low pressure plasma spraying (LPPS) has been investigated using a molten-metal immersion tester. The test revealed that the MoB/CoCr coating has much higher durability without dissolution in the molten Al-12.07wt.%Si alloy. Little change of crystal structure, mainly composed of ternary borides of Co2MoB2 and CoMoB, is observed after the immersion test, suggesting that the ternary borides have much higher durability.

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Plasma sprayed WC–Co coatings: Influence of spray conditions (atmospheric and low pressure plasma spraying) on the crystal structure, porosity, and hardness

Journal of Vacuum Science & Technology A Vacuum Surfaces and Films ◽

10.1116/1.572863 ◽

1985 ◽

Vol 3 (6) ◽

pp. 2483-2489 ◽

Cited By ~ 84

Author(s):

M. E. Vinayo ◽

F. Kassabji ◽

J. Guyonnet ◽

P. Fauchais

Keyword(s):

Crystal Structure ◽

Plasma Spraying ◽

Low Pressure ◽

Pressure Plasma ◽

Low Pressure Plasma ◽

Plasma Sprayed ◽

Low Pressure Plasma Spraying

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Microstructure and Ablation Behavior of Very Low-Pressure Plasma Sprayed ZrB2-Based Coatings

10.31399/asm.cp.itsc2021p0741 ◽

2021 ◽

Author(s):

Di Wang ◽

Xiao-Tao Luo ◽

Chang-Jiu Li

Keyword(s):

Plasma Spraying ◽

Ablation Rate ◽

Low Pressure ◽

Chamber Pressure ◽

Spray Chamber ◽

Deposition Pressure ◽

Pressure Plasma ◽

Low Pressure Plasma ◽

Plasma Sprayed ◽

Low Pressure Plasma Spraying

Abstract The effect of deposition pressure on the microstructure and ablation behavior of ZrB2 coatings deposited by very low pressure plasma spraying is investigated. The results show that under a chamber pressure less than 50 kPa, as the spray chamber pressure decreases, the porosity of the coating deposited at the same distance decreases, and the coating prepared under 100 Pa presents the lowest porosity of 1.79 %. Furthermore, among the ZrB2 coatings deposited at 100 Pa, 5 kPa, 10 kPa and 50 kPa, the dense coating deposited at 100 Pa showed the lowest ablation rate of 0.33 μm/s, 0.75±0.08 mg/s.

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Effect on Reverse Transferred Arc Treating on Bonding Strength in Low Pressure Plasma Spraying

Thermal Spray 1996: Proceedings from the National Thermal Spray Conference ◽

10.31399/asm.cp.itsc1996p0405 ◽

1996 ◽

Author(s):

K. Honda ◽

I. Chida ◽

T. Fuse ◽

T. Murakami ◽

K.F. Kobayashi

Keyword(s):

Plasma Spraying ◽

Bonding Strength ◽

Low Pressure ◽

Test Method ◽

Pressure Plasma ◽

Low Pressure Plasma ◽

Transferred Arc ◽

Sprayed Coating ◽

Plasma Sprayed ◽

Low Pressure Plasma Spraying

Abstract Both bonding strength of coating to substrate in low pressure plasma spraying and the effect of reverse transferred arc treating before spraying are studied in this paper. It is difficult to obtain the bonding strength precisely in low pressure plasma spraying by standard testing methods, such as, ASTM Standard C633-79 and JIS H8666-80. Therefore, for the bonding strength test rather than using a conventional adhesive, we believe a vacuum brazing process using Ag-Cu-In-Ti active filler metal at 1023 K should be used. We have also confirmed the practicality of this step. By the above test method, it has been proven that the bonding strength of low pressure plasma sprayed coating is over 100 MPa. Also, that reverse transferred arc treating after blasting enhances the bonding strength of low pressure plasma sprayed coating. It is also believed that the projections formed on the substrate surface by reverse transferred arc treating are buried into the coating and perform the pile effect.

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