Preparation and Thermal Shock Behavior of a Metal-enamel High-temperature Protective Coating

doi:10.11902/1005.4537.2019.137

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (5): 411-416 DOI: 10.11902/1005.4537.2019.137

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Preparation and Thermal Shock Behavior of a Metal-enamel High-temperature Protective Coating

LI Fengjie,CHEN Minghui(

),ZHANG Zheming,WANG Shuo,WANG Fuhui

Corrosion and Protection Division, Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China

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Abstract

A metal-enamel composite high temperature protective coating was prepared by using borosilicate enamel with low softening point as bonding phase. Its thermal shock behavior was investigated via cyclically heating at 900 ℃ and quenching into room-temperature water. The higher the proportion of silica, the higher the softening point of the borosilicate enamel. When the ratio (mass fraction) of boron oxide to silica reaches 0.6, the softening point of the borosilicate enamel is higher than 750 ℃. Thermal shock test indicated that the metal-enamel composite coating containing 20% nickel particles had high thermal shock resistance, and the coating surface was intact after 30 thermal shock cycles. The enamel coating is easy to crack and peel under thermal shock condition when no metal particles are incorporated or the metal content is as high as 40%.

Key words: enamel coating superalloy thermal shock

Received: 29 August 2019

ZTFLH:

TG174.4

Fund: National Natural Science Foundation of China(51871053)

Corresponding Authors: Minghui CHEN E-mail: mhchen@mail.neu.edu.cn

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Cite this article:

LI Fengjie,CHEN Minghui,ZHANG Zheming,WANG Shuo,WANG Fuhui. Preparation and Thermal Shock Behavior of a Metal-enamel High-temperature Protective Coating. Journal of Chinese Society for Corrosion and protection, 2019, 39(5): 411-416.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.137 OR https://www.jcscp.org/EN/Y2019/V39/I5/411

Table 1 Nominal compositions of four enamel powders (mass fraction / %)

Table 2 Chemical composition of K444 superalloy

Table 3 Compositions of three coatings (mass fraction / %)

Fig.1 Infrared absorbance spectra of four enamel powders

Fig.2 Softening behaviors of four enamel samples at 600 ℃ (a), 650 ℃ (b), 700 ℃ (c) and 750 ℃ (d)

Fig.3 Macroscopic morphologies of N0 coating (a), N20 coating (b) and N40 coating (c)

Fig.4 Surface SE-mode images of the composite coatings on K444 superalloy: (a) N0, (b) N20, (c) N40

Fig.5 Cross-sectional BSE-mode images of the composite coatings on K444 superalloy: (a) N0, (b) N20, (c) N40

Fig.6 Mass gains of the composite coatings on K444 superalloy during thermal shock test at 900 ℃

Fig.7 Macroscopic morphologies of N0 (a), N20 (b) and N40 (c) coatings after thermal shock test

Fig.8 Cross-sectional (a, c, e) and surface (b, d, f) morphologies of the N0 (a, b), N20 (c, d) and N40 (e, f) coatings after thermal shock and EDS scannings (a, c, e) along the yellow lines

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