High-Temperature Oxidation Characteristics of Al<sub>2</sub>O<sub>3</sub>/CoNiCrAlY Coating Obtained via Laser Cladding

Rui Zhang; Pan Ren; Yingfei Yang; Jiaoxi Yang; Shengfeng Zhou

doi:10.3788/LOP57.171408

Laser & Optoelectronics Progress, Volume. 57, Issue 17, 171408(2020)

High-Temperature Oxidation Characteristics of Al₂O₃/CoNiCrAlY Coating Obtained via Laser Cladding

Rui Zhang¹, Pan Ren², Yingfei Yang², Jiaoxi Yang³, and Shengfeng Zhou^2、*

Author Affiliations

¹School of Physical science and Technology, Tianjin Polytechnic University, Tianjin 300387, China

²Institute of Advanced Wear & Corrosion Resistance and Functional Materials, Jinan University, Guangzhou, Guangdong 510632, China;

³Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China

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Figures & Tables(12)

Fig. 1. XRD results of Al2O3/CoNiCrAlY coating at different energy densities

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Fig. 2. Microstructures of coating before oxidation. (a) Bottom of E1 coating; (b) top of E1 coating; (c) Al₂O₃ distribution in E1 coating; (d) bottom of E2 coating; (e) top of E2 coating; (f) Al₂O₃ distribution in E2 coating; (g) bottom of E3 coating; (h) top of E3 coating; (i) Al₂O₃ distribution in E3 coating

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Fig. 3. Oxidation kinetics curves of Al₂O₃/CoNiCrAlY coating at different energy densities. (a) Isothermal oxidation weight gain curves; (b) relationship curves between ΔW² and oxidation time

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Fig. 4. XRD results of Al₂O₃/CoNiCrAlY coating at different energy densities after oxidation

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Fig. 5. Microstructures of coating after oxidation. (a) Surface of E1 coating; (b) enlarged view of region I in Fig. (a); (c) enlarged view of region Ⅱ in Fig. (a); (d) surface of E2 coating; (e) enlarged view of region ix in Fig. (d); (f) enlarged view of region vi in Fig. (d); (g) surface of E3 coating; (h) enlarged view of region ii in Fig. (g); (i) enlarged view of region vii in Fig. (g)

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Fig. 6. Microstructures of cross section of coating after oxidation. (a)(b) Coating of E1 sample; (c)(d) coating of E2 sample; (e)(f) coating of E3 sample

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Fig. 7. Coating oxidation models. (a) Initial stage of oxidation; (b) after some time oxidation

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Table 1. Chemical compositions of cladding material CoNiCrAlY
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Table 1. Chemical compositions of cladding material CoNiCrAlY
Element Ni Cr Al Y Co
Mass fraction /% 32.0 21.0 8.0 0.5 38.5

Table 2. Process parameters of laser cladding
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Table 2. Process parameters of laser cladding
Sample Spotdiameter /mm Powder feedrate /(g·min^-1) Scanningspeed /(mm·s^-1) Laserpower /W Energydensity /(J·mm^-3)
E1 3.5 0.5 4 2000 51.98
E2 3.5 0.5 6 2000 34.65
E3 3.5 0.5 4 2500 64.97

Table 3. EDS analysis results of white particles
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Table 3. EDS analysis results of white particles
Element Co O Al Cr Ni Y
Massfraction /% 5.80 52.33 26.04 5.20 7.76 2.87

Table 4. EDS results of Al₂O₃/CoNiCrAlY coating shown in Fig. 5

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Table 4. EDS results of Al₂O₃/CoNiCrAlY coating shown in Fig. 5

Position	Mass fraction /%
Position	O	Al	Ni	Cr	Co	Si	Ti	Fe
Ⅰ	24.32	1.28	3.86	62.12	3.90	3.26	1.26
Ⅱ	29.03	5.49	12.18	38.93	14.37
Ⅲ	29.11	43.91	9.59	7.00	10.39
Ⅳ	24.20	18.80	14.18	25.58	17.24
Ⅴ	35.47	17.48	12.65	20.74	13.66
Ⅵ	18.31	35.75	17.18	10.79	17.97
Ⅶ	37.57	57.41	2.45	1.13	1.44
Ⅷ		4.71	34.80	22.15	37.03			1.31
Ⅸ	30.17	27.57	16.53	13.64	12.09
Ⅹ	29.33	8.79	9.72	33.42	17.71		1.03
Ⅺ	25.31	12.11	12.79	31.78	17.49		0.52
Ⅻ	30.94	8.44	9.84	33.20	17.58
iv	21.50	9.95	12.83	35.89	19.83

Table 5. EDS results of Al₂O₃/CoNiCrAlY coating shown in Fig. 6

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Table 5. EDS results of Al₂O₃/CoNiCrAlY coating shown in Fig. 6

Position	Mass fraction /%
Position	O	Al	Ni	Cr	Co	Si	Ti	P	N
C			88.59					11.41
D	8.70	9.65	33.15	29.16	19.34
E	15.17	31.46	36.45	6.79	10.13
F		51.53	5.18	3.99	5.19		3.15		30.96
G	36.93	42.98	20.09
L	31.35	23.37	18.32	14.55	12.41
M	44.34	55.66
B		68.27							31.73
A			40.85	17.55	40.60
S	57.28	42.72
T	45.93	54.07
V		81.14							18.86

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Rui Zhang, Pan Ren, Yingfei Yang, Jiaoxi Yang, Shengfeng Zhou. High-Temperature Oxidation Characteristics of Al₂O₃/CoNiCrAlY Coating Obtained via Laser Cladding[J]. Laser & Optoelectronics Progress, 2020, 57(17): 171408

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