Ta-10W 합금의 고온 마모 특성

• Published in: 대한금속·재료학회지, 62(10) Vol. 62; no. 10; pp. 827 - 835
• Main Authors: 강태훈, Tae-hoon Kang, 박정효, Jung Hyo Park, 김규식, Kyu-sik Kim, 이기안, Kee-ahn Lee
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 01.10.2024; 대한금속·재료학회
• Subjects: Ball-on-disc wear; High temperature wear; Oxidation; Ta-10W alloy; Wear mechanism; 재료공학
• ISSN: 1738-8228; 2288-8241
• DOI: 10.3365/KJMM.2024.62.10.827

This study investigated the high-temperature wear characteristics of Ta-10W alloy, composed of 90% tantalum and 10% tungsten, known for its high melting point, excellent corrosion resistance, and oxidation resistance. Wear tests were conducted using a ball-on-disc method with alumina balls at temperatures of 200℃, 400℃, 600℃, and 700℃. The results indicated that wear loss decreased (increasing wear resistance) from 200℃ to 600℃ due to the lubrication effect by oxide particles induced by Ta 2 O 5 , which enhanced wear resistance. However, at 700℃, a significant increase in wear loss was observed due to excessive oxide formation and the occurrence of cracks. Calculation of the wear rate revealed that it decreased as the temperature increased to 2.12×10 -4 ㎣· N -1 · m -1 at 200 ℃, 2.67×10 -5 ㎣·N -1 ·m -1 at 400 ℃, and 4.21×10 -6 ㎣· N -1 · m -1 at 600 ℃. On the other hand, the wear rate increased at 700 ℃ to 3.87×10 -4 ㎣· N -1 · m -1 . The wear track analysis results revealed distinct wear mechanisms at different temperatures. At 200℃, abrasive wear characterized by pits and furrows was dominant. At 400℃, adhesive wear became more prevalent with cleavage worn surfaces compared to the wear pattern at 200℃. At 600℃, fragmented oxides indicating pest oxidation were noted, while at 700℃, deep pits and cracks along with fragmented oxides were prevalent. X-ray diffraction (XRD) analysis results showed the presence of the α-Ta phase at 200℃, 400℃, and 600℃, with peak shifts indicating lattice expansion. In contrast, at 700℃, Ta 2 O 5 peaks were present. Based on the findings, the high-temperature wear mechanism of Ta-10W alloy was also discussed.