GB/T 18762-2017 in English
VALIDSpecification for filler brazing materials made of precious metal and their alloy
- Issued on:2017-07-12
- Implemented on:2018-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
《GB/T 18762-2017贵金属及其合金钎料规范》由TC243（全国有色金属标准化技术委员会）归口，TC243SC5（全国有色金属标准化技术委员会贵金属分会）执行，主管部门为中国有色金属工业协会。
Introduction
Core changes in the standard revision
| Revision dimensions | 2002 version | 2017 version | Technical significance |
|---|---|---|---|
| Number of grades | 52 | 71 | 15 new silver alloys such as BAg71.7CuNiLi, and 9 new gold alloys such as BAu88Pd |
| Dimension tolerance | Segment management | Interval merger | Wire material> 0.1-0.5mm deviation is unified to -0.02mm, simplifying production control |
| Material classification | Mixed arrangement | System reconstruction | Pd-containing silver alloys are classified into the palladium system, and special solders such as BPd37NiCrSiB are added |
Analysis of key technical requirements
1. Chemical composition control
Take BAg71.7CuNiLi780/800 as an example:
- Main components: Ag≥71.7%, Cu 26-28%, Ni 0.75-1.25%, Li 0.2-0.5%
- Impurity control: Pb≤0.005%, total amount≤0.15%
Application scenarios: Suitable for vacuum brazing of high-temperature aerospace components. Lithium can improve wettability
2. Dimension tolerance optimization
| Material type | Key parameters | Allowance deviation |
|---|---|---|
| Wire (>1-3mm) | Diameter | -0.06mm |
| Strip (>0.3-1mm) | Thickness | -0.04mm |
| Foil (≤0.05mm) | Thickness | ±0.005mm |
Implementation Suggestions
1. Material Selection Strategy
- Temperature Matching Principle: Select solder with liquidus 50-100℃ lower than the solidus of base material
- Environmental Adaptability: In vacuum environment, it is preferred to use grades with "V" mark (such as BVAg72Cu)
- Cost Control: Ag-Cu-Zn system is suitable for general working conditions, and Pd-Ag system is used for high reliability scenarios
2. Key Points of Quality Control
- Vacuum solder must be inspected for cleanliness (Grade I-II) and spattering (Grade A)
- Wire surface roughness Rz≤3.2μm (when diameter ≤1mm)
- Arbitration inspection sampling volume ≥ 15g (3×5g)
3. Misunderstandings in the application of standards
Case: A company mistakenly used BAg25CuP650/710 for stainless steel brazing. The actual selection should be:
- High temperature conditions: BAu88Pd1260/1300
- Medium temperature conditions: BAg54CuPd900/950
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