engineering

Plasma transferred wire arc thermal spraying

Plasma transferred wire arc thermal spraying is a engineering 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 Plasma transferred wire arc thermal spraying rather than just read about it. In short: Plasma transferred wire arc (PTWA) thermal spraying is a thermal spraying process that deposits a coating on the internal surface of a cylindrical surface, or external surface of any geometry. It is predominantly known for its use in coating the cylinder bores of an internal combustion engine, enabling the construction of aluminium engine blocks without cast iron cylinder sleeves.

Key takeaways

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

Reference excerpt

Plasma transferred wire arc (PTWA) thermal spraying is a thermal spraying process that deposits a coating on the internal surface of a cylindrical surface, or external surface of any geometry. It is predominantly known for its use in coating the cylinder bores of an internal combustion engine, enabling the construction of aluminium engine blocks without cast iron cylinder sleeves. The inventors of PTWA received the 2009 IPO National Inventor of the Year award. This technology was initially patented and developed by Flame-Spray Industries, and subsequently improved upon by Flame-Spray and Ford.

Process A single conductive wire is used as feedstock for the system. A supersonic plasma jet—formed by a transferred arc between a non-consumable cathode and the wire—melts and atomizes the wire. A stream of air transports the atomized metal onto the substrate. The particles flatten upon striking the surface of the substrate due to their high kinetic energy. The particles rapidly solidify upon contact and can assume both crystalline and amorphous phases. There is also the possibility of producing multi-layer coatings via stacked layers of particles, increasing wear resistance. All conductive wires up to and including 1.59 mm (0.0625 in) can be used as feedstock material, including "cored" wires. Refractory metals, as well as low melt materials, are easily deposited.

Applications PTWA can be used to apply a coating to wear surfaces of engine or transmission components, serving as a plain bearing. For the cylinder bores of hypoeutectic aluminum-silicon alloy blocks, PTWA's main advantages over cast iron liners are reduced weight and cost. The thinner bore surface also allows for more compact bore spacing, and can potentially provide better heat transfer. Automotive engines that use PTWA include Nissan VR38DETT, and Ford Coyote. Caterpillar and Ford also use PTWA to remanufacture engines.

References

External links PTWA internal coating system http://www.sae.org/mags/aei/manuf/7624

Worked examples

Example 1 — a first encounter with Plasma transferred wire arc thermal spraying

Start with the simplest possible case. Write down what Plasma transferred wire arc thermal spraying claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, 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 Plasma transferred wire arc thermal spraying 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 Plasma transferred wire arc thermal spraying 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 Plasma transferred wire arc thermal spraying

In research: Plasma transferred wire arc thermal spraying appears in engineering 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 Plasma transferred wire arc thermal spraying 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: Plasma transferred wire arc thermal spraying is common in secondary-school and first-year university syllabi. It links to neighbouring topics Coatings, Metallurgical processes, Plasma processing, so understanding it makes those chapters shorter.
In everyday life: Look for Plasma transferred wire arc thermal spraying 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Plasma transferred wire arc thermal spraying in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Plasma transferred wire arc thermal spraying 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 Plasma transferred wire arc thermal spraying out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Plasma transferred wire arc thermal spraying in simple terms?

Why does Plasma transferred wire arc thermal spraying matter?

Because it connects several engineering 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 Plasma transferred wire arc thermal spraying?

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 Plasma transferred wire arc thermal spraying.