Wear Analysis of Plasma Sprayed Calcium and Strontium Zirconates on Inconel 718

Venkatesh, G.; Subramanian, R.; Abuthakir, J.; Berchmans, L. John

doi:10.1590/1980-5373-MR-2022-0282

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Article • Mat. Res. 27 • 2024 • https://doi.org/10.1590/1980-5373-MR-2022-0282 copy

Wear Analysis of Plasma Sprayed Calcium and Strontium Zirconates on Inconel 718

Authorship SCIMAGO INSTITUTIONS RANKINGS

CaZrO₃and SrZrO₃powders were prepared by sol-gel synthesis and plasma sprayed over the Inconel 718 substrate,forming a wear-resistant ceramic coating. X-Ray Diffraction (XRD) analysis of synthesized ceramic powders revealed the presence of CaZrO₃and SrZrO₃ phases, having an orthorhombic structure. CaZrO₃ and SrZrO₃powders were sprayed onto the surface of Inconel 718using a plasma spraying process. Scanning Electron Microscope (SEM)analysis of CaZrO₃and SrZrO₃coated samplesshowedanaveragethickness of about 400μm.Wear depth and wear mechanism for the above sampleswerestudiedusing Pin-on-disc apparatus. Wear results of CaZrO₃ and SrZrO₃ coated substrates revealed that high wear depths were observed at high speeds and loads. SEM investigations of worn-out samples revealed that both CaZrO₃ and SrZrO₃ coated samples had undergone delamination wear. CaZrO₃ coated samples had exhibitedless delamination and wear depth than SrZrO₃ coated samples, thus showing relatively better wear resistance.

Keywords:
Wear-resistant Coatings; Calcium Zirconate; Strontium Zirconate; ceramic coatings; Sol-gel synthesis; Atmospheric plasma spraying

Parameters	Bond Coat	Top Coat 1	Top Coat 2
Current (A)	500	550	550
Voltage (V)	60	70	70
Spraying Distance (mm)	100	100	100
Spraying Speed (mm/sec)	10	10	10
Powder Feed Rate (g/min)	35	35	20
Ar/He Ratio	15/50	15/50	15/50

S.No.	Load(N)	Speed(rpm)	Time(minutes)	Wear depth(µm)	Coefficient of friction(µ)
1	10	300	5	92	0.75
2	10	300	10	112	0.51
3	10	300	15	137	0.49
4	10	400	5	120	0.53
5	10	400	10	136	0.57
6	10	400	15	159	0.58
7	10	500	5	140	0.46
8	10	500	10	164	0.46
9	10	500	15	83	0.47
10	15	300	5	98	0.91
11	15	300	10	123	0.91
12	15	300	15	117	0.89
13	15	400	5	132	0.92
14	15	400	10	146	0.80
15	15	400	15	123	0.72
16	15	500	5	187	0.64
17	15	500	10	219	0.63
18	15	500	15	212	0.63
19	20	300	5	102	0.43
20	20	300	10	132	0.40
21	20	300	15	157	0.38
22	20	400	5	165	0.34
23	20	400	10	176	0.32
24	20	400	15	188	0.30
25	20	500	5	162	0.33
26	20	500	10	201	0.30
27	20	500	15	233	0.30

S.No.	Load (N)	Speed (rpm)	Time (minutes)	Wear depth (ìm)	Coefficient of friction(ì)
1	10	300	5	147	0.73
2	10	300	10	153	0.71
3	10	300	15	164	0.65
4	10	400	5	166	0.61
5	10	400	10	189	0.55
6	10	400	15	214	0.41
7	10	500	5	178	0.49
8	10	500	10	193	0.45
9	10	500	15	229	0.44
10	15	300	5	181	0.68
11	15	300	10	197	0.65
12	15	300	15	207	0.62
13	15	400	5	243	0.69
14	15	400	10	267	0.65
15	15	400	15	294	0.61
16	15	500	5	274	0.57
17	15	500	10	282	0.55
18	15	500	15	309	0.53
19	20	300	5	211	0.42
20	20	300	10	228	0.40
21	20	300	15	246	0.36
22	20	400	5	299	0.33
23	20	400	10	341	0.32
24	20	400	15	387	0.32
25	20	500	5	426	0.30
26	20	500	10	450	0.28
27	20	500	15	468	0.27

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