KR20160107246A - 코발트 코팅에 의한 고온 부품의 개선된 내마모성 - Google Patents

코발트 코팅에 의한 고온 부품의 개선된 내마모성 Download PDF

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KR20160107246A
KR20160107246A KR1020167021618A KR20167021618A KR20160107246A KR 20160107246 A KR20160107246 A KR 20160107246A KR 1020167021618 A KR1020167021618 A KR 1020167021618A KR 20167021618 A KR20167021618 A KR 20167021618A KR 20160107246 A KR20160107246 A KR 20160107246A
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substrate
high temperature
layer
cobalt
based alloy
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베른트 부르바움
브릿타 라욱스
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지멘스 악티엔게젤샤프트
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    • F01D5/288—Protective coatings for blades
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    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
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    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
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Abstract

본 발명은 더 높은 탄소 함량을 포함하는 코발트 코팅을 갖는 코팅된 고온 부품에 관한 것이다.

Description

코발트 코팅에 의한 고온 부품의 개선된 내마모성{IMPROVED WEAR RESISTANCE OF A HIGH-TEMPERATURE COMPONENT IMPARTED BY A COBALT COATING}
본 발명은, 내마모성을 증가시키기 위해, 코발트 기반 합금으로 이루어진 층이 사용되는 고온 부품에 관한 것이다.
특히 고온 영역 내의 터빈 블레이드의 블레이드 첨부, 이른바 "팁"은 침식성 재료 손실을 통해 형성된 마모 증가를 나타낸다.
이는, 로터 블레이드의 첨부가 용접 또는 납땜과 같은 다양한 수리 공정을 통해 규칙적으로 복원되어야 하는 결과를 가져온다.
본 발명의 과제는 내마모성을 개선하여 보수 간격이 연장될 수 있도록 하는 방법을 제공하는 것이다.
상기 과제는 청구항 제1항에 따른 부품에 의해 해결된다.
추가의 장점을 달성하기 위해 임의로 서로 조합될 수 있는 다른 바람직한 조치들이 종속 청구항에 명시된다.
기재(substrate material)로서 공지되었거나 이와 유사한, 코발트 기반 합금으로 이루어진 층을 마모를 받는 부품의 영역 상에 제공하는 것이 제안되며, 상기 부품은 바람직하게는, 코발트 기반 합금보다 탄소 함량이 더 낮은 니켈 기반 합금을 기재로서 포함한다. 높은 사용 온도에서, 코팅으로부터 모재료 내로의 탄소의 확산이 발생하는데, 이는 통상 바람직하지 못하나, 여기서는 기판 내의 더 높은 카바이드 ?t량을 유도하여, 더 높은 경도와 이로 인한 더 높은 내마모성을 유도한다.
니켈 기반 기판에 대한 예는, 코발트 기반 합금 PWA795가 제공된 블레이드 재료 PWA1483이다.
이는 통상, 더 높은 경도와 이로 인한 더 높은 내마모성을 유도하는 MC 및 M23C6 유형의 카바이드를 유도한다.
도 1 및 도 2는 본 발명의 실시예를 도시한다.
도 3은 초합금 리스트이다.
도면 및 상세한 설명은 단지 본 발명의 실시예를 나타낸다.
도 1은 코팅된 기판(4)을 도시한다. 기판[4, 4'(도 2)]은 특히 터빈 블레이드(120, 130)와 같은 고온 부품에서, 니켈- 또는 코발트 기반 초합금이며, 특히 니켈 기반이다(도 3). 기판(4, 4')은 제1 탄소 함량을 포함한다. 기판(4, 4')의 측면에는 금속 보호 코팅[7, 7'(도 2)] 및/또는 세라믹 보호 코팅[10, 10'(도 2)]이 제공된다.
금속 보호 코팅(7, 7')은 바람직하게는 탄소(C)가 제거되고, 특히, 조성물 NiCoCrAl 또는 NiCoCrAlX (X = Y, Re), NiCoCrAlTa, NiCoCrAlFe, NiCOCrAlYFe, NiCoCrAlYFeTa, NiCoCrAlFeTa 또는 NiCoCrAlYTa를 포함하며, 특히 그들로부터 형성된다. 탄탈럼(Ta) 또는 철(Fe)의 함량은 한 자릿수 퍼센트 범위, 특히 < = 5 중량% 이다.
종래 기술에서, 편평한 블레이드 첨부[19, 19'(도 2)]는 통상 코팅을 포함하지 않기 때문에, 기판(4, 4')의 자유 단부(19)는 증가된 마모에 노출될 수도 있다. 기판(4, 4')의 노출된 면[14, 20, 23(도 2)] 상에 코발트 기반 합금으로 이루어진 층[13, 13'(도 2)]이 제공된다.
이러한 코발트 기반 합금은 기판(4, 4')보다 더 높은 탄소 함량(C)을 포함하며, 기판(4, 4')과 층(13, 13')의 탄소 함량의 절대차는 적어도 0.03 중량% 이다.
다른 실시예가 도 2에 도시되며, 리세스(20)를 갖는 외측 벽(23)을 포함하는 팁으로서의 첨부(19')가 형성된다. 도 1과 마찬가지로, 금속 코팅(7') 및 세라믹 코팅(10')이 제공된다. 마찬가지로, 면(20, 23)에서, 코발트 기반 합금으로 이루어진 층(13')이 첨부(19')의 영역 내의 기판(4') 상에 제공된다.
도 1 및 도 2에 따른 부품의 추가의 열 처리 없이, 더욱 고온에서의 부품의 임의의 사용 지속 시간 후에, 이미 1173K 내지 1223K에서 100 시간 후에, 바람직하게는 0.1mm 얇기의 코발트 기반 층(13, 13')으로부터 기판(4, 4')으로 탄소(C)의 확산이 이루어진다.
바람직하게는, 층(13, 13') 상에는 경우에 따라 세라믹 층(10, 10')과 관련되어, 세라믹 층이 존재할 수 있다.
기판(4, 4')의 니켈 기반 합금은 바람직하게는, 적어도 크롬(Cr), 코발트(Co), 텅스텐(W), 알루미늄(Al), 티타늄(Ti), 선택적으로 탄탈럼(Ta)을 포함하며, 바람직하게는 레늄(Re) 및 바람직하게는 이트륨(Y)을 포함하지 않는다.
코발트 기반 합금은 적어도, 크롬(Cr), 니켈(Ni), 텅스텐(W), 선택적으로 (탄탈럼), 알루미늄(Al), 티타늄(Ti)을 포함하며, 바람직하게는 레늄(Re) 및 바람직하게는 이트륨(Y)을 포함하지 않는다.

Claims (13)

  1. 니켈 기반 또는 코발트 기반 초합금의 금속 기판(4, 4')으로 이루어진,
    특히 니켈 기반 합금으로 이루어진 고온 부품이며,
    기판(4, 4')은 제1 탄소 함량을 포함하며,
    코발트 기반 합금으로 이루어진 층(13, 13')이 기판(4, 4')의 면(14, 20, 23) 상에 직접 제공되며,
    상기 층은 기판(4, 4')보다 더 높은 탄소 함량을 포함하는, 고온 부품.
  2. 제1항에 있어서, 층(13, 13')은 단지 국부적으로, 특히 더 높은 침식 부하를 갖는 영역(19, 19') 내에만 제공되는, 고온 부품.
  3. 제1항 또는 제2항 중 어느 한 항 또는 두 항에 있어서, 기판(4, 4')은 기판(4, 4')의 면(14, 20, 23)에 인접하는, 금속 코팅(7, 7') 및/또는 금속 코팅(7, 7') 상의 세라믹 코팅(10, 10')에 의해 코팅되며,
    특히 금속 코팅(7, 7')은 탄소(C)를 포함하지 않는, 고온 부품.
  4. 제2항 또는 제3항 중 어느 한 항 또는 두 항에 있어서, 영역(19)은 평편한 평면의 첨부(19)를 나타내는, 고온 부품.
  5. 제2항 또는 제3항 중 어느 한 항 또는 두 항에 있어서, 영역(19')은 독립된(freestanding) 벽(23)을 갖는 첨부(19')를 나타내는, 고온 부품.
  6. 제1항 내지 제5항 중 어느 한 항 또는 복수의 항에 있어서, 기판(4, 4')과 층(13, 13')의 탄소 함량의 절대차는 적어도 0.03 중량% 인, 고온 부품.
  7. 제1항 내지 제6항 중 어느 한 항 또는 복수의 항에 있어서, 기판(4, 4')은 방향성 응고되며,
    특히 주상 응고되며,
    아주 특별하게는 단결정 응고되는, 고온 부품.
  8. 제1항 내지 제7항 중 어느 한 항 또는 복수의 항에 있어서, 층(13, 13')은 금속 코팅(7, 7')을 고작 부분적으로 오버랩하는, 고온 부품.
  9. 제1항 내지 제8항 중 어느 한 항 또는 복수의 항에 있어서, 층(13, 13')은, 금속 층(7, 7')보다 훨씬 더 얇게,
    특히 적어도 10% 더 얇게 형성되는, 고온 부품.
  10. 제1항 내지 제9항 중 어느 한 항 또는 복수의 항에 있어서, 기판(4, 4')의 니켈 기반 합금은 적어도 크롬(Cr), 코발트(Co), 텅스텐(W), 알루미늄(Al), 티타늄(Ti), 선택적으로 탄탈럼(Ta)을 포함하며, 바람직하게는 레늄(Re) 및 바람직하게는 이트륨(Y)을 포함하지 않는, 고온 부품.
  11. 제1항 내지 제10항 중 어느 한 항 또는 복수의 항에 있어서, 층(13, 13')의 코발트 기반 합금은 적어도 크롬(Cr), 니켈(Ni), 텅스텐(W), 선택적으로 탄탈럼(Ta), 알루미늄(Al), 티타늄(Ti)을 포함하며, 바람직하게는 레늄(Re) 및 바람직하게는 이트륨(Y)을 포함하지 않는, 고온 부품.
  12. 제3항 내지 제11항 중 어느 한 항 또는 복수의 항에 있어서, 금속 코팅(7, 7')은 탄소를 포함하지 않으며,
    특히, NiCoCrAl, NiCoCrAlX, NiCoCrAlTa 또는 NiCoCrAlFe, NiCOCrAlYFe, NiCoCrAlYFeTa, NiCoCrAlFeTa 또는 NiCoCrAlYTa를 포함하며, 아주 특별하게는 그들로부터 형성되는, 고온 부품.
  13. 제1항 내지 제12항 중 어느 한 항 또는 복수의 항에 있어서, 층(13, 13')은 1㎛ 내지 100㎛의 두께를 포함하는, 고온 부품.
KR1020167021618A 2014-02-11 2015-01-05 코발트 코팅에 의한 고온 부품의 개선된 내마모성 KR20160107246A (ko)

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US10100651B2 (en) 2018-10-16

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