AMCA - Advanced Medium Combat Aircraft (HAL)

[THESIS THORON]

Lavrov is coming in 2 days in Delhi. May be we can get some TOT on Item-17 engine for AMCA, taking advantage of the current situation?

they themselves havent mastered that tech

 

[THESIS THORON]

btw, is is it theoretically possible to use diamond blades in jet engine ?

as diamonds can sustain higher temps

just asking

 

[Dark Sorrow]

btw, is is it theoretically possible to use diamond blades in jet engine ?

as diamonds can sustain higher temps

just asking

Ohio State University engineers are developing a technology to coat jet engine turbine blades with zirconium dioxide -- commonly called zirconia, the stuff of synthetic diamonds -- to combat high-temperature corrosion.


The zirconia chemically converts sand and other corrosive particles that build up on the blade into a new, protective outer coating. In effect, the surface of the engine blade constantly renews itself.
Ultimately, the technology could enable manufacturers to use new kinds of heat-resistant materials in engine blades, so that engines will be able to run hotter and more efficiently.
Nitin Padture, professor of materials science and engineering at Ohio State, said that he had military aircraft in mind when he began the project. He was then a professor at the University of Connecticut.
“In the desert, sand is sucked into the engines during takeoffs and landings, and then you have dust storms,” he said. “But even commercial aircraft and power turbines encounter small bits of sand or other particles, and those particles damage turbine blades.”
Jet engines operate at thousands of degrees Fahrenheit, and blades in the most advanced engines are coated with a thin layer of temperature-resistant, thermally-insulating ceramic to protect the metal blades. The coating -- referred to as a thermal-barrier coating -- is designed like an accordion to expand and contract with the metal.

The problem: When sand hits the hot engine blade it melts -- and becomes glass.
“Molten glass is one of the nastiest substances around. It will dissolve anything,” Padture said.
The hot glass chews into the ceramic coating. But the real damage happens after the engine cools, and the glass solidifies into an inflexible glaze on top of the ceramic. When the engine heats up again and the metal blades expand, the ceramic coating can’t expand, because the glaze has locked it in place. The ceramic breaks off, shortening the life of the engine blades.
In a recent issue of the journal Acta Materialia, Padture and his colleagues described how the new coating forces the glass to absorb chemicals that will convert it into a harmless -- and even helpful -- ceramic.
The problem: When sand hits the hot engine blade it melts -- and becomes glass. “Molten glass is one of the nastiest substances around. It will dissolve anything,” Padture said.

The key, Padture said, is that the coating contains aluminum and titanium atoms hidden inside zirconia crystals. When the glass consumes the zirconia, it also consumes the aluminum and titanium. Once the glass accumulates enough of these elements, it changes from a molten material into a stable crystal, and it stops eating the ceramic.
“The glass literally becomes a new ceramic coating on top of the old one. Then, when new glass comes in, the same thing will happen again. It’s like it’s constantly renewing the coating on the surface of the turbine,” Padture said.
Padture’s former university has applied for a patent on the technique that he devised for embedding the aluminum and titanium into the zirconia. He’s partnering with Inframat Corp., a nanotechnology company in Connecticut, to further develop the technology.
Padture stressed that the technology is in its infancy. He has yet to apply the coatings to complex shapes, and cost is a barrier as well: the process is energy-consuming.
But if that cost eventually came down and the technology matured, the payoff could be hotter engines that burn fuel more efficiently and create less pollution. Manufacturers would be able to use more sophisticated ceramics that boost the heat-resistance of engines. Eventually, technology could go beyond aircraft and power-generator turbines and extend to automobiles as well, Padture said.
His coauthors on the Acta Materialia paper included Ohio State doctoral student Aysegul Aygun, who is doing this work for her dissertation; former postdoctoral researcher Alexander Vasiliev, who is now at the Russian Academy of Sciences; and Xinqing Ma, a scientist at Inframat Corp.
This research was funded by the Office of Naval Research and Naval Air Systems Command.

Ohio State University. "Fake Diamonds Help Jet Engines Take The Heat." ScienceDaily. ScienceDaily, 19 March 2008.

Fake Diamonds Help Jet Engines Take The Heat

Engineers are developing a technology to coat jet engine turbine blades with zirconium dioxide -- commonly called zirconia, the stuff of synthetic diamonds -- to combat high-temperature corrosion. The zirconia chemically converts sand and other corrosive particles that build up on the blade into...

www.sciencedaily.com

 

[HariPrasad-1]

I think length and diameter of Brahmos NG will make it infeasible to fit in AMCA's IWB.

It is not made to be fitted in internal bay like many other weapons. Internal weapon bays will mainly carry 1.5 tons of SAM and small bombs.

 

[THESIS THORON]

Ohio State University engineers are developing a technology to coat jet engine turbine blades with zirconium dioxide -- commonly called zirconia, the stuff of synthetic diamonds -- to combat high-temperature corrosion.


The zirconia chemically converts sand and other corrosive particles that build up on the blade into a new, protective outer coating. In effect, the surface of the engine blade constantly renews itself.
Ultimately, the technology could enable manufacturers to use new kinds of heat-resistant materials in engine blades, so that engines will be able to run hotter and more efficiently.
Nitin Padture, professor of materials science and engineering at Ohio State, said that he had military aircraft in mind when he began the project. He was then a professor at the University of Connecticut.
“In the desert, sand is sucked into the engines during takeoffs and landings, and then you have dust storms,” he said. “But even commercial aircraft and power turbines encounter small bits of sand or other particles, and those particles damage turbine blades.”
Jet engines operate at thousands of degrees Fahrenheit, and blades in the most advanced engines are coated with a thin layer of temperature-resistant, thermally-insulating ceramic to protect the metal blades. The coating -- referred to as a thermal-barrier coating -- is designed like an accordion to expand and contract with the metal.

The problem: When sand hits the hot engine blade it melts -- and becomes glass.
“Molten glass is one of the nastiest substances around. It will dissolve anything,” Padture said.
The hot glass chews into the ceramic coating. But the real damage happens after the engine cools, and the glass solidifies into an inflexible glaze on top of the ceramic. When the engine heats up again and the metal blades expand, the ceramic coating can’t expand, because the glaze has locked it in place. The ceramic breaks off, shortening the life of the engine blades.
In a recent issue of the journal Acta Materialia, Padture and his colleagues described how the new coating forces the glass to absorb chemicals that will convert it into a harmless -- and even helpful -- ceramic.
The problem: When sand hits the hot engine blade it melts -- and becomes glass. “Molten glass is one of the nastiest substances around. It will dissolve anything,” Padture said.

The key, Padture said, is that the coating contains aluminum and titanium atoms hidden inside zirconia crystals. When the glass consumes the zirconia, it also consumes the aluminum and titanium. Once the glass accumulates enough of these elements, it changes from a molten material into a stable crystal, and it stops eating the ceramic.
“The glass literally becomes a new ceramic coating on top of the old one. Then, when new glass comes in, the same thing will happen again. It’s like it’s constantly renewing the coating on the surface of the turbine,” Padture said.
Padture’s former university has applied for a patent on the technique that he devised for embedding the aluminum and titanium into the zirconia. He’s partnering with Inframat Corp., a nanotechnology company in Connecticut, to further develop the technology.
Padture stressed that the technology is in its infancy. He has yet to apply the coatings to complex shapes, and cost is a barrier as well: the process is energy-consuming.
But if that cost eventually came down and the technology matured, the payoff could be hotter engines that burn fuel more efficiently and create less pollution. Manufacturers would be able to use more sophisticated ceramics that boost the heat-resistance of engines. Eventually, technology could go beyond aircraft and power-generator turbines and extend to automobiles as well, Padture said.
His coauthors on the Acta Materialia paper included Ohio State doctoral student Aysegul Aygun, who is doing this work for her dissertation; former postdoctoral researcher Alexander Vasiliev, who is now at the Russian Academy of Sciences; and Xinqing Ma, a scientist at Inframat Corp.
This research was funded by the Office of Naval Research and Naval Air Systems Command.

Ohio State University. "Fake Diamonds Help Jet Engines Take The Heat." ScienceDaily. ScienceDaily, 19 March 2008.

Fake Diamonds Help Jet Engines Take The Heat

Engineers are developing a technology to coat jet engine turbine blades with zirconium dioxide -- commonly called zirconia, the stuff of synthetic diamonds -- to combat high-temperature corrosion. The zirconia chemically converts sand and other corrosive particles that build up on the blade into...

www.sciencedaily.com

they have able to make 4 inch diamond thru CVD . Ofc they can improve upon that

 

[HariPrasad-1]

btw, is is it theoretically possible to use diamond blades in jet engine ?

as diamonds can sustain higher temps

just asking

In GE engines, which uses carbon composite fan, Titanium leading edges are used to protect the edges of Fan which faces maximum errosion.

 

[Lonewolf]

btw, is is it theoretically possible to use diamond blades in jet engine ?

as diamonds can sustain higher temps

just asking

Regular diamond ??

U know the composition of diamond ? Basically you want to provide heat to carbon in presence of oxygen , good luck

 

[THESIS THORON]

Regular diamond ??

U know the composition of diamond ? Basically you want to provide heat to carbon in presence of oxygen , good luck

bhai protective coating to rahegi na

 

[Dark Sorrow]

Regular diamond ??

U know the composition of diamond ? Basically you want to provide heat to carbon in presence of oxygen , good luck

Its syntactic diamond, zirconia to be exact.

 

[Dark Sorrow]

bhai protective coating to rahegi na

Diamond coating is used as protective coating. Their is no protective coating on this diamond coating.

 

[Lonewolf]

Its syntactic diamond, zirconia to be exact.

I know zircon ,i made comment on original proposal.

bhai protective coating to rahegi na

It reduces damage ,not gonna keep it cool at room temperature

 

[Lonewolf]

Diamond coating is used as protective coating. Their is no protective coating on this diamond coating.

He is proposing blades to be made of diamond ,not the tbc

 

[THESIS THORON]

I know zircon ,i made comment on original proposal.

It reduces damage ,not gonna keep it cool at room temperature

ok, but what abt synthetic diamond

 

[Lonewolf]

ok, but what abt synthetic diamond

Need to read more , plus manufacturing feasibility also matter ,even if material is suitable and justify all properties

 

[Dark Sorrow]

He is proposing blades to be made of diamond ,not the tbc

Diamond blades are currently not feasible.

 

[Covfefe]

btw, is is it theoretically possible to use diamond blades in jet engine ?

as diamonds can sustain higher temps

just asking

Diamonds in their current form have poor shear strength, worse than iron. The linear moment due to blade length plus torsional stress due to air flow- combined load will have significant shear loading. That's why they avoid even granular structure in metals to arrest fault propagation. Vibration is another very big factor. Physical properties at higher Temperature to uske baad aayega

 

[Dark Sorrow]

ok, but what abt synthetic diamond

Currently manufacturing is not advanced enough for either make blades from synthetic diamond or diamond.
How will you crush the material and after making granules how will you make blades. Current manufacturing only supports subtractive manufacturing to make high grades parts.

 

[Super Flanker]

btw, is is it theoretically possible to use diamond blades in jet engine ?

as diamonds can sustain higher temps

just asking

Do you even know how expensive this technique of using diamonds for the engine blades be? Go and look at the price of diamond just 1 KG, it's like 1,00000+! So if we use diamonds than it will cost upwards of 5-10+ Million (You do the math and find out but the cost is not going to be economical) so no diamond.

 

[THESIS THORON]

Do you even know how expensive this technique of using diamonds for the engine blades be? Go and look at the price of diamond just 1 KG, it's like 1,00000+! So if we use diamonds than it will cost upwards of 5-10+ Million (You do the math and find out but the cost is not going to be economical) so no diamond.

wtf ?
I am talking abt synthetic diamonds

and everything is expensive earlier then gradually it becomes cheap.

 

[Super Flanker]

wtf ?
I am talking abt synthetic diamonds

and everything is expensive earlier then gradually it becomes cheap.

Brother You should have said very clearly that your intention was to use "Synthetic diamond" and not regular expensive ones. (Bruh/lol)
-

The major cost for retail diamonds comes from 2 things- 1) cartel to maintain exclusivity of the product, 2) extensive polish to give it shiny edges. To get the same mechanical properties, you don't need a shiny jewellery type diamond, there are diamond studded inserts and bits used in drilling and machining already.
OT for this thread

Engine blades will be made of whatever they are mostly made up of. Read this:

"Modern turbine blades often use nickel-based superalloys that incorporate chromium, cobalt, and rhenium."

Please end this debate with regards to diamond here itself. No need of using diamond.