Preparation and Performance Analysis of High Temperature Oxidation Cladding Coating on TC4 Surface

doi:10.12141/j.issn.1000-565X.230489

Abstract

Abstract:

Due to the susceptibility of TC4 material to oxidation failure in high-temperature environments, its service life is significantly shortened under harsh conditions such as high temperatures and marine environments. To augment the high-temperature oxidation resistance of TC4 material surfaces, this paper employed laser cladding technology to prepare a high-temperature oxidation-resistant cladding coating with a gradient mass fraction of additive phases on the TC4 surface. The microstructure of the coating was observed using scanning electron microscopy (SEM), and the impact of the additive phase on the microstructure morphology of the cladding was analyzed. Subsequently, microhardness tests were performed to obtain the microhardness distribution of coatings with different material compositions, and the effect of additive phase content on the microhardness of the cladding was analyzed. Ultimately, macroscopic morphology observation, oxidation kinetics, SEM, and XRD methods were employed to evaluate the high-temperature oxidation resistance of the cladded samples after high-temperature oxidation tests. The effects of ceramic phase content and the high-temperature oxidation process on the microstructure and phase composition of the cladding layer were analyzed, and the oxidation resistance mechanism of the coating was explored. The experimental findings reveal that the incorporation of ceramic phase powders results in a marked improvement in the microhardness of the cladding layer, along with a refinement and densification of its microstructure. The dense oxide products formed during the high-temperature oxidation process effectively isolate the coating from the oxidizing environment, thereby substantially enhancing its resistance to high-temperature oxidation. The high-temperature oxidation product Ta₂O₅ formed on the surface of the cladding layer has a dense structure, strong high-temperature stability, and excellent oxidation resistance, which is the main reason for the improved high-temperature oxidation resistance of the ceramic phase-containing TC4 cladding layer.

Key words: titanium alloy, ceramic powder, high temperature oxidation, laser cladding

CLC Number:

TG178

ZHENG Lijuan, XIE Yinkai, ZHANG Kuo, FU Yuming. Preparation and Performance Analysis of High Temperature Oxidation Cladding Coating on TC4 Surface[J]. Journal of South China University of Technology(Natural Science Edition), 2025, 53(3): 97-104.

Figures/Tables 7

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实验组编号	质量分数/%
实验组编号	TaC	HfC	TC4
A	2.5	2.5	95.0
B	5.0	5.0	90.0
C	7.5	7.5	85.0
D	0.0	0.0	100.0

试样编号	形貌
试样编号	初始状态	550 ℃恒温氧化60 h时	600 ℃恒温氧化60 h时	700 ℃恒温氧化60 h时	800 ℃恒温氧化60 h时
A
B
C
D

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