Preparation and High Temperature Oxidation Behavior of Ceramic Coating for Electro-thermal Alloy Foam

doi:10.11901/1005.3093.2016.368

Chinese Journal of Materials Research

2017, Vol. 31

Issue (8): 603-611 DOI: 10.11901/1005.3093.2016.368

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Preparation and High Temperature Oxidation Behavior of Ceramic Coating for Electro-thermal Alloy Foam

Xiaona HU¹, Deli DUAN¹(

), Jun LIU², Shu LI¹

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 Shanghai Institute of Space Propulsion, Shanghai, 201112, China

Cite this article:

Xiaona HU, Deli DUAN, Jun LIU, Shu LI. Preparation and High Temperature Oxidation Behavior of Ceramic Coating for Electro-thermal Alloy Foam. Chinese Journal of Materials Research, 2017, 31(8): 603-611.

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Abstract

The ceramic coating B-1000 was applied on the foamed electro-heating alloy NiCr20 through vacuum impregnation and high-temperature fusion sintering. The isothermal oxidation behavior at 1000℃ and thermal shock behavior between 1000℃ and 20^oC of the foamed electro-heating alloy with and without ceramic coating were investigated in air. The resistance to oxygen inward migration of the coating was evaluated by tensile test at 1000^oC in air. The results showed that the thin ceramic coating was uniform, dense, and well- adhesive to the substrate, which improved the oxidation resistance and thermal shock resistance of the foamed alloy NiCr20 significantly. The apparent tensile strength of the foamed electro-heating alloy NiCr20 with the coating B-1000 kept c.a. 2 MPa after air oxidation at 1000^oC for 20 h.

Key words: metallic materials foamed electro-thermal alloy ceramic coating vacuum impregnation and sintering isothermal oxidation thermal shock tension property

Received: 29 June 2016

ZTFLH:

TG146.15

Fund: Supported by National Defense Foundation of China (No.JPPT-125-5-031)

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	Xiaona HU
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	Jun LIU
	Shu LI

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.368 OR https://www.cjmr.org/EN/Y2017/V31/I8/603

Table 1 The nominal chemical compositions of the B-1000 ceramic power (mass fraction,%)

Fig.1 SEM images of the B-1000 high temperature ceramic powder after ball milling (a) 0 h, (b) 170 h

Fig.2 Macro morphologies of the NiCr20 alloy foam (a) without coating, (b)with coating

Fig.3 SEM cross-sectional microstructure of the foam NiCr20 alloy applied ceramic coating (different areas)

Table 2 EDS results of points A, B, C in Fig.3 (mass fraction, %)

Fig.4 Oxidation kinetics of NiCr20 alloy without and with enamel coatings at 1000℃ in air

Table 4 The results of thermal shock experiment

Fig.5 SEM cross-sectional microstructure of the foam NiCr20 alloy with enamel coating after isothermal oxidation for 1, 2, 5, 10 and 20 h in static air at 1000℃ (a) 1 h, (b) 2 h, (c) 5 h, (d) 10 h and (e) 20 h

Table 3 EDS results of areas A-O in Fig.5 (mass fraction, %)

Fig.6 XRD analysis of the foamed NiCr20 alloy applied ceramic coating

Fig.7 SEM cross-sectional microstructure of the foam NiCr20 alloy after isothermal oxidation for (a) 2, (b) 5 and (c) 10 h in static air at 1000℃

Fig.8 XRD analysis of the foam NiCr20 alloy after isothermal oxidation for 1 h and 20 h in static air at 1000℃ (a) 1 h; (b) 20 h

Fig.9 SEM cross-sectional microstructure of foam NiCr20 alloy with ceramic coatings after hot-shock test at 1000℃ for 20 times, and EDS elements profile

Fig.10 Scatter plots of tensile strength at room temperature of foamed NiCr20 electro-thermal alloy before and after oxidation at 1000℃

Fig.11 Macro view of foamed NiCr20 alloy after tensile tests (a) foamed NiCr20 alloy without ceramic coating; (b) morphologies foamed NiCr20 alloy with ceramic coating

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