Effects of Powder Morphology and Powder Preheating on the Properties and Deposition Behavior of Titanium Coating Layer Manufactured by Cold Spraying

Jae-Nam Hwang; Myeong-Ju Lee; Hyung-Jun Kim; Ik-Hyun Oh; Kee-Ahn Lee

doi:10.4150/KPMI.2012.19.5.348

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저온 분사 티타늄 코팅층의 특성 및 적층 거동에 미치는 분말 형상과 분말 예열의 영향: 황재남, 이명주, 김형준, 오익현, 이기안
Effects of Powder Morphology and Powder Preheating on the Properties and Deposition Behavior of Titanium Coating Layer Manufactured by Cold Spraying: Jae-Nam Hwang, Myeong-Ju Lee, Hyung-Jun Kim, Ik-Hyun Oh, Kee-Ahn Lee; Journal of Korean Powder Metallurgy Institute 2012;19(5):348-355
DOI: https://doi.org/10.4150/KPMI.2012.19.5.348

¹국립안동대학교 신소재공학부
²국립안동대학교 신소재공학부
³포항산업과학연구원
⁴한국생산기술연구원
⁵국립안동대학교 신소재공학부
¹School of Advanced Mater. Eng., Andong National University
²School of Advanced Mater. Eng., Andong National University
³RIST
⁴KITECH
⁵School of Advanced Mater. Eng., Andong National University

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Abstract

Cold spray deposition using Titanium powder was carried out to investigate the effects of powder morphology and powder preheating on the coating properties such as porosity and hardness. The in-flight particle velocity of Ti powder in cold spray process was directly measured using the PIV (particle image velocimetry) equipment. Two types of powders (spherical and irregular ones) were used to manufacture cold sprayed coating layer. The results showed that the irregular morphology particle appeared higher in-flight particle velocity than that of the spherical one under the same process condition. The coating layer using irregular morphology powder represented lower porosity level and higher hardness. Two different preheating conditions (no preheating and preheating at 500°C) were used in the process of cold spraying. The porosity decreased and the hardness increased by conducting preheating at 500°C. It was found that the coating properties using different preheating conditions were dependent not on the particle velocity but on the deformation temperature of particle. The deposition mechanism of particles in cold spray process was also discussed based on the experimental results of in flight-particle velocity.

Keywords: Cold spraying;Titanium;Coating;Porosity;Hardness;Microstructure;In-flight particle velocity;

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