A deposition model applied in a thermal spray process

作者：Lin JL^*; Ma HK

来源：International Communications in Heat and Mass Transfer, 2004, 31(3): 323-332.

DOI：10.1016/j.icheatmasstransfer.2004.02.003

In a thermal spray process, particles are fed into a high-velocity, high-temperature gas jet directed toward the substrate. A quantitative description of the particle impact on the substrate, as a function of particle size, injected velocity, and molten fraction, is a key to developing better models for describing the coating formation process. In this study, the results show that the positions, velocities, and temperature of the Ni particles are highly dependant on the diameter and injected velocity of the particles. The deposition-splashing boundary equation is a function of the Weber number (W-e), the dimensionless maximum diameter (beta(max)), and the contact angle (circle dot) on the substrate. The criterion of a liquid particle deposition or splashing is determined by the critical Weber number. The value of We is equal to 469.5 for Re-p<10,000, and 31.5 for Rep>10,000. It is found that the smaller Ni particles may easily deform and then deposit or splash on the substrate, whereas particles with larger sizes (>120 m) do not.

• 出版日期2004-4