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Vol.38, No.4, 565 ~ 571, 2000

Title

Pesearch Paper / Surface Treatment : Amorphous Thick Coating Formation of a Zr65Al7.5Ni10Cu17.5 Alloy Fabricated by HVOF Spraying

임경묵K . M . Lim,박찬경C . G . Park,김형준H . J . Kim,성병근B . G . Seong

Abstract

This investigation was conducted to clarify the effects of process variables such as spraying distance and fuel flow rate on the formation of the new amorphous coating using Zr_(65)Al_(7.5)Ni_(10)Cu_(17.5) alloy by a HVOF(High Velocity Oxygen-Fuel) spraying process. Powder used for spraying was prepared by vacuum gas atomization and centrifugal-mill. HVOF spraying experiments were carried out using a Tafa JP-5000 spraying gun. The amorphous content was measured up to about 65% depending on the spraying parameters. The amorphous fraction is decreased with increasing the spray distance. Microstructural observations and XRD analysis reveal that the change of amorphous fraction is attributed to the degree of solidification of droplets and the oxide (ZrO₂) formation in coatings. The higher fuel flow rate resulted in the decrease of amorphous fraction, and this decreased amorphous fraction was caused by the increase of oxide fraction. Therefore, flame temperature and spray distance that can control the oxide formation in coating and undercooling effects of droplets are the most crucial factors for the formation of amorphous coating using this alloy system.

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