chemistry

Laser bonding

Laser bonding is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Laser bonding rather than just read about it. In short: Laser bonding is a marking technique that uses lasers to bond an additive marking substance to a substrate. First invented in the mid 1990s by Essilor International, this patented method produces permanent marks on metal, glass, ceramic and plastic parts for a diverse range of industrial and artistic applications, ranging from aerospace and medical to the awards and engraving industries.

Key takeaways

Laser bonding belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Laser bonding to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Laser bonding from memory before moving on to harder problems.

Reference excerpt

Laser bonding is a marking technique that uses lasers to bond an additive marking substance to a substrate. First invented in the mid 1990s by Essilor International, this patented method produces permanent marks on metal, glass, ceramic and plastic parts for a diverse range of industrial and artistic applications, ranging from aerospace and medical to the awards and engraving industries. It differs from the more widely known techniques of laser engraving and laser ablation in that it is an additive process, adding material to the substrate surface instead of removing it. Laser bonding has been achieved by Nd:YAG, CO2 laser, Fiber laser and Diode-pumped solid-state laser and can be accomplished using other forms of radiant energy.

The laser bonding process Mark quality depends on a variety of factors, including the substrate used, marking speed, laser spot size, beam overlap, materials thickness, and laser parameters. Laser bonding materials may be applied by various methods, including a brush on technique, spraying, pad printing, screen printing, roll coating, tape, and others. The marking process generally comprises three steps: 1. Application of the marking material. 2. Irradiating the marking material with a laser in the form of the desired mark. 3. Removal of excess, unbonded material. The resulting marking is permanently bonded to the substrate, and in most cases it is as durable as the substrate itself.

The durability of laser bonded markings Markings placed on stainless steel are extremely durable and have survived such testing as abrasion resistance, chemical resistance, outdoor exposure, extreme heat, extreme cold, acids, bases and various organic solvents. Marks on glass have been tested for resistance to acids, bases and scratching. NASA's International Space Station, or ISS, was home to aluminum squares laser marked with CerMark® marking material for almost four years. These squares were part of the Material International Space Station Experiment, or MISSE. In this experiment test markings were applied to coupons made of materials commonly used in the construction of the external components used on space transportation vehicles, satellites and space stations. Markings applied using a wide range of different methods and techniques, including laser bonding. The material test coupons were then affixed to spaces provided on test panels, which were then installed onto trays which were attached to the ISS during a space walk conducted during the STS-105 Mission flown on August 10, 2001. The trays were positioned on the ISS so that they could expect to receive the maximum amount of impact damage and exposure to a high degree of atomic oxygen and UV radiation. The experiment was recovered on July 30, 2005 during STS-114 and returned to earth on August 9, 2005. The markings, DataMatrix two dimensional bar codes, were evaluated and found to be readable and visually looked as good as the day they were placed in orbit. The laser bonding process is outlined and specified in both military and NASA marking specifications and standards. Laser bonding is also a preferred technique for use in the United States Department of Defense "Item Unique Identification" system (IUID).

See also Laser engraving Laser ablation Laser applications

References

Worked examples

Example 1 — a first encounter with Laser bonding

Start with the simplest possible case. Write down what Laser bonding claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Laser bonding before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Laser bonding ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Laser bonding

In research: Laser bonding appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Laser bonding in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Laser bonding is common in secondary-school and first-year university syllabi. It links to neighbouring topics Laser applications, Laser machining, so understanding it makes those chapters shorter.
In everyday life: Look for Laser bonding outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Laser bonding in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Laser bonding means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Laser bonding out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Laser bonding in simple terms?

Why does Laser bonding matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Laser bonding?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Laser bonding.