KR102371432B1 - 납땜 합금, 솔더 페이스트, 납땜 볼, 솔더 프리폼, 납땜 조인트, 및 기판 - Google Patents
납땜 합금, 솔더 페이스트, 납땜 볼, 솔더 프리폼, 납땜 조인트, 및 기판 Download PDFInfo
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- KR102371432B1 KR102371432B1 KR1020217037980A KR20217037980A KR102371432B1 KR 102371432 B1 KR102371432 B1 KR 102371432B1 KR 1020217037980 A KR1020217037980 A KR 1020217037980A KR 20217037980 A KR20217037980 A KR 20217037980A KR 102371432 B1 KR102371432 B1 KR 102371432B1
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- braze alloy
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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Abstract
Description
[도 2] 도 2는, 납땜 볼 표면의 XPS 분석의 차트이다.
[도 3] 도 3은, 납땜 볼 표면의 XPS 분석의 차트이다.
[도 4] 도 4는, 무전해 Ni/Au 도금 처리된 Cu 전극에 Sn-58Bi 납땜 합금을 이용하는 납땜 부착을 수행하고, 납땜 접합부를 전단 제거한 후에 있어서의, 배율 300배의 전극의 표면 사진이다.
[도 5] 도 5 (a) 및 도 5 (b)는, 무전해 Ni/Au 도금 처리가 수행된 Cu 전극의 납땜 부착에 따라서 납땜 조인트가 형성되었을 경우에 있어서의, 납땜 접합부와 전극과의 계면 근방의 배율 800배의 단면 사진이며, 도 5 (c) 및 도 5 (d)는, 무전해 Ni/Pd/Au 도금 처리가 수행된 Cu 전극의 납땜 부착에 따라서 납땜 조인트가 형성되었을 경우에 있어서의, 납땜 접합부와 전극과의 계면 근방의 배율 800배의 단면 사진이다.
[도 6] 도 6은, Sn-40Bi-(0~1.1)Cu-0.03Ni-(0~0.004)As 납땜 합금의, Cu 함유량과 전단 강도(Cu 전극)와의 관계를 나타내는 도이다.
[도 7] 도 7은, Sn-40Bi-(0~1.1)Cu-0.03Ni-(0~0.004)As 납땜 합금의, Cu의 함유량과 전단 강도(무전해 Ni/Au 전극)와의 관계를 나타내는 도이다.
[도 8] 도 8은, Sn-40Bi-(0~1.1)Cu-0.03Ni-(0~0.004)As 납땜 합금의, Cu의 함유량과 합금의 연신과의 관계를 나타내는 도이다.
[도 9] 도 9는, Sn-40Bi-0.5Cu-(0~0.07)Ni-(0~0.004)As 납땜 합금의, Cu의 함유량과 전단 강도(Cu 전극)와의 관계를 나타내는 도이다.
[도 10] 도 10은, Sn-40Bi-0.5Cu-(0~0.07)Ni-(0~0.004)As 납땜 합금의, Cu의 함유량과 전단 강도(무전해 Ni/Au 전극)와의 관계를 나타내는 도이다.
[도 11] 도 11은, Sn-40Bi-0.5Cu-(0~0.07)Ni-(0~0.004)As 납땜 합금의, Cu의 함유량과 합금의 연신과의 관계를 나타내는 도이다.
Claims (9)
- 질량%로, Bi: 31~59%, Cu: 0.3~1.0%, Ni: 0.01~0.06%, As: 0.0040~0.025%, 잔부가 Sn으로 이루어지는 합금 조성을 갖고, As 농화층을 갖고, 상기 As 농화층의 존재는 이하의 판정 기준에 의해 확인되는 것이고, 상기 As 농화층은, 납땜 합금의 최표면으로부터 SiO2 환산의 깊이로 2×D1(nm)까지의 영역이며, 상기 As 농화층의 SiO2 환산의 두께가 0.5~8.0 nm인 것을 특징으로 하는 납땜 합금.
(판정 기준)
5.0mm×5.0mm의 크기의 샘플에 있어서, 임의의 700μm×300μm의 에어리어를 선정하고, 이온 스퍼터링을 병용한 XPS 분석을 수행한다. 샘플 1개에 대해 1개의 에어리어를 선정하고, 3개의 샘플에 대해 각각 1회씩, 합계 3회의 분석을 수행한다. 전체 3회의 분석의 모두에 있어서 S1>S2가 되는 경우, As 농화층이 형성되어 있다고 판단한다.
여기서,
S1: XPS 분석의 차트에 있어서, SiO2 환산의 깊이가 0~2×D1(nm)의 영역에 있어서의 As의 검출 강도의 적분치
S2: XPS 분석의 차트에 있어서, SiO2 환산의 깊이가 2×D1~4×D1(nm)의 영역에 있어서의 As의 검출 강도의 적분치
D1: XPS 분석의 차트에 있어서, O 원자의 검출 강도가 최대가 된 SiO2 환산의 깊이(Do·max(nm))보다 깊은 부분에 있어서, O 원자의 검출 강도가 최대 검출 강도(Do·max에서의 강도)의 1/2의 강도가 되는 최초의 SiO2 환산의 깊이(nm). - 청구항 1에 있어서,
상기 합금 조성은, 질량%로, P 및 Ge의 적어도 1종을 합계로 0.003~0.05%를 더 함유하는, 납땜 합금. - 청구항 1 또는 청구항 2의 납땜 합금으로 이루어지는 납땜 분말과 플럭스로 이루어지는 솔더 페이스트.
- 청구항 1 또는 청구항 2의 납땜 합금으로 이루어지는 납땜 볼.
- 청구항 1 또는 청구항 2의 납땜 합금으로 이루어지는 솔더 프리폼.
- Ni 도금층을 가지는 Cu 전극 상에 청구항 1 또는 청구항 2의 납땜 합금으로부터 형성된 납땜 조인트.
- 청구항 6에 있어서,
상기 Ni 도금층은 P를 함유하는 무전해 도금층인, 납땜 조인트. - 판 두께가 5 mm 이하이며, Ni 도금층을 가지는 적어도 1개의 Cu 전극을 갖고, 상기 Cu 전극의 각각은 청구항 1 또는 청구항 2의 납땜 합금으로부터 형성된 납땜 조인트를 가지는 기판.
- 청구항 8에 있어서,
상기 Ni 도금층은 P를 함유하는, 기판.
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