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NTIS 바로가기大韓溶接·接合學會誌 = Journal of the Korean Welding and Joining Society, v.30 no.6, 2012년, pp.27 - 35
유호천 (한국과학기술정보연구원 ReSEAT 프로그램)
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핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
TiAl(티타늄 알루미나이트) 합금은 어떤 특성을 가지고 있는가? | TiAl(티타늄 알루미나이트) 합금은 높은 비강도, 내산화 특성, 뛰어난 크리프강도, 고온에서 높은 강성을 나타내고 있으며, 감마(γ)-TiAl로 분류되는 금속간 화합물이다. TiAl은 가벼운 질량과 열저항성으로 인해 가장 실용적인 재료로 주목을 받고 있다. | |
Ti-Al 소재의 접합을 어렵게 하는 방법은 어떤 것이 있는가? | Ti-Al 소재의 접합에 GTAW, 브레이징, 레이저 용접, 전자빔용접과 같은 종래의 용융용접방법이 종종 사용되고 있다. 그러나 높은 잔류응력과 낮은 연성을 가진 이 소재는 높은 반응성으로 인하여 접합계면에 취성의 금속간 상과 산화물 상을 형성하기 쉬워 TiAl의 접합을 매우 어렵게 하고 있다. | |
TiAl는 어떤 산업에서 전망이 밝은가? | TiAl은 가벼운 질량과 열저항성으로 인해 가장 실용적인 재료로 주목을 받고 있다. 값비싼 니켈 등을 대체할 수 있는 내열강과 초내열합금(superalloy)에 대한 대체재료로 매우 전망이 밝으며, 약 40% 정도의 획기적인 무게감량을 기할 수 있으므로 특히 자동차 산업과 항공우주산업에의 적용에 상당히 활성화 될 것으로 예상하고 있다. 그러나 TiAl은 접합부에 취성을 형성하기 쉬워, 접합을 매우 어렵게 하고 있으나 브레이징 접합은 이러한 문제점을 피할 수 있는 가장 효과적인 기술로 인정받고 있다. |
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