Effect of Heat Treatment Environment on the Densification of Cold Sprayed Ti Coating Layer

Ji-Sang Yu; Hyung-Jun Kim; Ik-Hyun Oh; Kee-Ahn Lee

doi:10.4150/KPMI.2012.19.2.110

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저온 분사 공정으로 제조된 티타늄 코팅층의 치밀화에 미치는 열처리 분위기의 영향: 유지상, 김형준, 오익현, 이기안
Effect of Heat Treatment Environment on the Densification of Cold Sprayed Ti Coating Layer: Ji-Sang Yu, Hyung-Jun Kim, Ik-Hyun Oh, Kee-Ahn Lee; Journal of Korean Powder Metallurgy Institute 2012;19(2):110-116
DOI: https://doi.org/10.4150/KPMI.2012.19.2.110

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

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Abstract

This study investigated the effects of annealing environment for the densification and purification properties of pure titanium coating layer manufactured by cold spraying. The annealing was conducted at 600°C/1 h and three kinds of environments of vacuum, Ar gas, and 5%H_2+Ar mixture gas were controlled. Cold sprayed Ti coating layer (as sprayed) represented 6.7% of porosity and 228 HV of hardness, showing elongated particle shapes (severe plastic deformation) perpendicular to injection direction. Regardless of gas environments, all thermally heat treated coating layers consisted of pure alpha-Ti and minimal oxide. Vacuum environment during heat treatment represented superior densification properties (3.8% porosity, 156.7 HV) to those of Ar gas (5.3%, 144.5 HV) and 5%H_2+Ar mixture gas (5.5%, 153.1 HV). From the results of phase analysis (XRD, EPMA, SEM, EDS), it was found that the vacuum environment during heat treatment could be effective for reducing oxide contents (purification) in the Ti coating layer. The characteristic of microstructural evolution with heat treatment was found to be different at three different gas environments. The controlling method for improving densification and purification in the cold sprayed Ti coating material was also discussed.

Keywords: Cold spraying;Titanium;Heat treatment;Gas environment;Densification;Purification;

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