由于铟具有柔软性和可压缩性，因此非常适合用于制造密封件。
让我们进入正题：
Indium preforms are commonly used to create seals. The preforms are made into an endless variety of shapes and sizes to fit the application. Crucial to the seal is the thickness of the preform, because, if the volume of indium is insufficient, the seal will eventually fail – due to lack of indium to fill in the gaps.
Indium wire is also a form used in the creation of a vacuum, hermetic or cryogenic seal. Care must be taken to insure that the correct diameter of wire is used to make the seal. Too small of a diameter, the gap will not be adequately filled leaving the seal area vulnerable to leaks. Too large, and the indium, when compressed, will exit the seal area and may interfere with other electronics in the area.
使用金属丝时，必须注意将金属丝对准需要密封的区域的中心。如果金属丝偏离中心，在压缩时可能会由于不均匀而无法形成足够的密封。在某些情况下，在密封区域开一个小槽是很有好处的，这样在放置金属丝时就能以槽为导向，准确地放置金属丝。
Indium metal is self-passivating and will form about 80-100 Angstroms of oxide on its surface at room temperature. In more critical seal applications, it is essential that this oxide layer be removed prior to creating the seal because if the oxide is present during the compression of the indium, the oxide will be pushed below the surface and could create a path for leakage.
Not all seals require the same level of performance. A purity of 99.99% indium is adequate for a vacuum, hermetic or cryogenic seal, but higher purities are also available if needed. Some seals need to maintain their integrity for many years while others only need to hold for a short period of time. Develop your design based on what you know about the application.The more critical seals will need to be made following the procedure outlined below to insure that the integrity requirements are met.
- 用丙酮对铟进行脱脂处理，去除可能影响密封的任何表面有机物。
- 将铟放入 10% 的盐酸中浸泡约 1 分钟，以去除表面的氧化物。
- 用去离子水彻底冲洗，去除盐酸。
- 用丙酮冲洗，去除水分。
- 用干燥氮气吹干或晾干。
Please see our Application Note on Etching Indium to Remove Oxides, and watch this video to see how it's done.
注意事项
铟会自己冷焊，尤其是在表面氧化物被去除之后。明白我的意思了吧。必须注意不要让铟接触到其他新蚀刻的铟片，因为它们会粘在一起，就像接触水泥一样。在不损坏铟片的情况下，即使不是不可能，也很难分离。
Please see our Application Note on the Cold Welding of Indium.
After the indium is ready to use, care must be taken in the proper placement of the preform or wire on the surface to be sealed. Once the indium is in place, the amount of pressure required to make the seal is dependent on the application. A few trials may be required until just the right amount of pressure is determined to form the seal that is needed. These trials are also a good time for adjustments to be made in the thickness of the indium used.
请随时利用我们的经验和知识，帮助您缩短印章流程的实施准备时间。
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2012 年 10 月 23 日
