chemistry

Titanium aluminium nitride

Titanium aluminium nitride 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 Titanium aluminium nitride rather than just read about it. In short: Titanium aluminium nitride (TiAlN) or aluminium titanium nitride (AlTiN; for aluminium contents higher than 50%) is a group of metastable hard coatings consisting of nitrogen and the metallic elements aluminium and titanium. This compound as well as similar compounds(such as TiN and TiCN) are most notably used for coating machine tools such and endmills and drills to change their properties, such as increased therma…

Key takeaways

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

Reference excerpt

Titanium aluminium nitride (TiAlN) or aluminium titanium nitride (AlTiN; for aluminium contents higher than 50%) is a group of metastable hard coatings consisting of nitrogen and the metallic elements aluminium and titanium. This compound as well as similar compounds(such as TiN and TiCN) are most notably used for coating machine tools such and endmills and drills to change their properties, such as increased thermal stability and/or wear resistance. Four important compositions (metal content 100 wt.%) are deposited in industrial scale by physical vapor deposition methods:

Ti50Al50N (industrially introduced by the company CemeCoat (now CemeCon) Aachen, BRD, group T. Leydecker ca. 1989) Al55Ti45N (industrially introduced by the company Metaplas Ionon (now Oerlikon), Bergisch Gladbach, BRD, group J. Vetter ca. 1999) Al60Ti40N (industrially introduced by the company Kobe Steel, Kobe, Japan, ca. 1992) Al66Ti34N (industrially introduced by the company Metaplas (now Oerlikon) group J. Vetter ca. 1996). The fundamental reasons why TiAlN coatings outperform pure Titanium nitride (TiN) coatings are considered to be:

Increased oxidation resistance at elevated temperatures due to the formation of a protective aluminium-oxide layer at the surface Increased hardness in the freshly deposited films due to micro-structure changes and solid solution hardening Age hardening of the coatings at temperatures typical for cutting tools operation due to spinodal decomposition of TiAlN into TiN and cubic AlN The age hardening phenomenon has been shown to originate in a mismatch in the quantum mechanical electronic structure of TiN and AlN. The coatings are mostly deposited by cathodic arc deposition or magnetron sputtering. Even though most TiAlN and AlTiN coatings are industrially synthesized using alloy targets with specific percentages of aluminium and titanium it is possible to produce TiAlN coatings with pure Al and Ti targets using a cathodic arc deposition technique. TiAlN and AlTiN coatings from pure Al and pure Ti targets by Cathodic arc deposition have been produced industrially by NanoShield PVD Thailand since 1999. By using separate target technology it is possible to offer more flexibility regarding the structure and composition of the coating. Selected properties of Al66Ti34N are:

Vickers hardness 2600 to 3300 HV. Phase stability ca. 850 °C, start of decomposition to AlN+TiN. Intense oxidation starts at about 800 °C (ca. 300 °C higher than for TiN). Lower electrical and thermal conductivity than TiN Typical coating thickness ca. (1 to 7) μm One commercial coating type used to improve the wear resistance of tungsten carbide tools is the AlTiN-Saturn from Sulzer Metaplas. The coatings are sometimes doped with at least one of the elements carbon, silicon, boron, oxygen and yttrium in order to improve selected properties for specific applications. These coatings are also used to create multilayer systems. For example, they can be used in combination with TiSiXN like those used in the Mpower coating family of Sulzer Metaplas. The coating types mentioned above are applied to protect tools including special tools for medical applications. They are also used as decorative finishes. One derivative of TiAlN coating technology is the nanocomposite TiAlSiN (titanium aluminium silicon nitride) which was developed by SHM in the Czech Republic and now marketed by Platit of Switzerland. The nanocomposite TiAlSiN coating exhibits superhard hardness and outstanding high temperature workability.

References

External links Nanocomposite AlTiNCO Coatings Deposited by Reactive Cathodic Arc Evaporation [1]

Illustrations

Worked examples

Example 1 — a first encounter with Titanium aluminium nitride

Start with the simplest possible case. Write down what Titanium aluminium nitride 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 Titanium aluminium nitride 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 Titanium aluminium nitride 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 Titanium aluminium nitride

In research: Titanium aluminium nitride 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 Titanium aluminium nitride 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: Titanium aluminium nitride is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aluminium compounds, Nitrides, Titanium compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Titanium aluminium nitride 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 Titanium aluminium nitride in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Titanium aluminium nitride 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 Titanium aluminium nitride out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Titanium aluminium nitride in simple terms?

Why does Titanium aluminium nitride 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 Titanium aluminium nitride?

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 Titanium aluminium nitride.