冷喷涂Ti涂层的颗粒变形行为及孔隙分布

doi:10.7527/S1000-6893.2023.29316

Abstract

Abstract:

In the deposition process of Cold Spraying （CS）， the bonding strength between particles is small， and defectsas pores and interparticle boundaries are common in the coatings. In order to study the formation mechanism of these defects， three kinds of Ti coatings with different particle sizes distributions were prepared at different airflow temperatures. According to the experimental parameters， the Coupled Euler-Lagrange （CEL） model of random multi-particle deposition was established， and the deformation of particles after deposition and the pores distribution law inside the coatings were calculated. The results showed that the numerical simulation and experimental results were in good agreement. The collision action causes the accumulation of particles to be directional， and with the increase of velocities， the deformation of particles increases， and the inner particles are more affected by the velocities than the outer particles. Under the same parameters， the deposits with large particles have larger pores and higher porosities. At low velocities， the pores inside the coatings communicate with each other to form pore clusters， and as the velocities increase， the pore sizes decrease and the porosities decrease.

Key words: cold spraying, Ti coating, CEL model, particle deformation, pores distribution

CLC Number:

V261.93

Chouting ZHOU, Yu’e MA, Zexuan YANG, Wenya LI, Chunjie HUANG, Lei LIU. Particle deformation behavior and pores distribution of cold sprayed Ti coatings[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(12): 429316-429316.

Figures/Tables 21

Table 1

Particle size parameters of Ti metal powders

参数	P1601	P1602	P1603
D₁₀/μm	13	28	41
D₅₀/μm	25	39	56
D₉₀/μm	34	45	66
n	3.424	7.081	6.749
$d ¯$ /μm	26.93	40.74	58.40

Table 1

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Table 2

Table 3

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参数	数值
密度ρ/（kg·m^-3）	451
弹性模量E/GPa	116
比热容c/（J·（kg·K）^-1）	528
导热系数λ/（W·（m·K）^-1）	16
泊松比ν	0.34
初始屈服强度A/MPa	806.57
硬化系数B/MPa	481.61
应变-硬化指数n	0.319
应变率常数C	0.019 4
软化指数m	0.655
参考温度T₀/K	298
熔点T_m/K	1 923

编号	载流温度/K	平均温度/K	平均速度/（m·s^-1）
P1601	1 173	776	731
	1 273	844	759
	1 373	913	786
P1602	1 173	888	694
	1 273	965	718
	1 373	1 042	740
P1603	1 173	942	657
	1 273	1 023	677
	1 373	1 104	695

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Particle deformation behavior and pores distribution of cold sprayed Ti coatings

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