Chapter 751

"Not necessarily!"

As soon as Director Wen's words fell, Gu Lu gently spit out these words in his mouth.

Director Wen was slightly stunned.

He frowned and asked, "Gu Lu, what do you mean?"

The corners of Gu Lu's mouth rose slightly, "Director Wen, we don't have to start all over again. ”

"Director Wen, you come with me. ”

said.

Gu Lu led Director Wen to the workbench.

Then, Gu Lu casually pulled out a blank drawing paper and sketched a simple schematic diagram with a drawing tool on it.

"It's ......"

Seeing Gu Lu's schematic diagram that was gradually taking shape, Director Wen raised his eyebrows at first, and then seemed to realize something, and the look in his eyes became extremely serious.

A few minutes later.

Gu Lu's schematic diagram has been drawn.

Gu Lu clapped his hands and put the drawing pen in his hand aside, "Director Wen, that's probably what I think." ”

Gu Lu's schematic diagram is very clear.

Director Wen, an insider, can be said to understand at a glance.

After reading the information contained in Gu Lu's schematic diagram, Director Wen secretly smacked his tongue and asked with a smile on his face.

"The idea of incorporating chromium alloy into molten steel and then processing it to make a steel-chromium alloy composite material seems to be highly feasible! How did you come up with it?"

That's right.

Gu Lu's plan is similar to Director Wen's, which also combines high-temperature resistant materials such as chromium alloy with low-cost steel materials.

Merely.

Director Wen's idea was to apply a chrome coating to the surface of the steel plate.

Gu Lu's idea is to try to fuse chrome alloy and steel together at the molten steel stage, and then temper the raw steel and process it into steel plates.

In the face of Director Wen's praise, Gu Lu just waved his hand modestly and smiled, "Director Wen, I just stood on the shoulders of giants to look at the problem, if it weren't for your inspiration, I wouldn't have such an idea." ”

When Gu Lu said this, he attributed part of the credit to Director Wen.

Director Wen instantly felt that his face was full of face, and he smiled with a red face.

"Without further ado, let's try it right away based on this diagram of yours, and as far as I can tell, we have a good chance of succeeding this time!"

With that, Director Wen dragged him downstairs to the material processing laboratory to get busy.

The melting temperature of chromium alloys is more than 6,000 degrees Celsius.

Therefore......

Gu Lu's scheme of mixing chromium with molten steel after financialization to make steel-chromium alloy composite materials is quite complicated in terms of processing technology.

I spent two days working in the materials processing lab downstairs.

Gu Lu and Director Wen only processed a palm-sized steel-chromium alloy plate.

Put it in a high-temperature test box.

Set the temperature at 3,300 degrees.

Minutes and seconds passed.

The steel-chromium alloy plate in the high-temperature chamber did not undergo any deformation.

But......

Gu Lu and Director Wen didn't show any joy on their faces.

This steel-chromium alloy plate is to be up to standard.

The first requirement to meet was to stay at least half an hour at 3,300 degrees Celsius.

And now.

Less than ten minutes have passed.

The wait can be incredibly long.

It was only thirty minutes, but Gu Lu and Director Wen seemed to be as long as thirty hours had passed.

But......

The results are quite encouraging.

This steel-chromium plate held up.

It lasted thirty minutes.

Gu Lu and Director Wen glanced at each other, and their eyes once again showed joy.

"Clip it out and take a look. ”

After the cooling was completed, Director Wen urged Gu Lu.

Gu Lu nodded, and carefully prepared to clip out this steel plate with tweezers.

But......

When Gu Lu had just touched this steel-chromium alloy plate with tweezers, he saw that the entire steel plate began to crack inch by inch.

A few seconds later.

The steel-chromium plate was completely reduced to a pile of scraps.

Smile.

Gu Lu and Director Wen both had a wry smile on their faces at the same time.

This is already their 251st defeat!

"Sure enough, it still doesn't work!" Director Wen sat on the chair, looking like he was loveless.

Gu Lu looked at the pile of scraps in the high-temperature experiment box, touched his chin, and muttered for a few seconds before speaking, "It should be that the binding force between the internal materials is not enough." ”

Before.

Gu Lu only takes into account the high temperature resistance properties of the material.

However, it ignores the different internal adhesion of different materials.

The addition of chrome alloy makes the original tight structure of steel become a little loose.

This also leads to [Tian Lai fo].

When heated by high temperatures, the entire material becomes 'shattered when touched'.

It is clearly not possible to make the casing of a liquid hydrogen liquid oxygen engine from such materials.

"But what exactly is needed to increase the stiffness of this shell material?"

Gu Lu frowned and was thinking bitterly.

............

A plan that was originally full of confidence failed in this way.

This is tantamount to adding insult to injury for Gu Lu and Director Wen.

But......

For scientific researchers, there is no such thing as giving up at all.

After the failure,

It is necessary to get up again from where you failed.

Gu Lu and Director Wen were busy again.

After so many failures, the general direction of the two's research has been determined.

That is, through the composite processing of a variety of materials, a material that is not only resistant to high temperature, but also cheap and has high stiffness is prepared.

Gu Lu and Director Wen have proved with many failures that this process requires at least three materials to be compounded.

The steel material and the chromium alloy are already determined.

So what's the last one left!

After more than half a month of exploration.

Gu Lu and Director Wen chose this material as graphite.

Graphite is an allotropic form of the element carbon, in which three other carbon atoms (arranged in a honeycomb-like hexagon) are connected to each carbon atom around each other to form a covalent molecule.

High temperature resistance: The melting point of graphite is 3850±50 °C, the boiling point is 4250 °C, even if it is burned by ultra-high temperature arc, the weight loss is very small, and the coefficient of thermal expansion is also very small.

From the data, it can be seen that graphite can withstand the high temperature of liquid hydrogen combustion is 3,300 degrees Celsius.

However, the reason why Gu Lu chose graphite is because of another characteristic of graphite.

That is, the strength of graphite increases with temperature, and at 2000°C, the strength of graphite doubles.

In simple terms, graphite is an S-M.

The harder you abuse me, the more comfortable I am!

This is very much in line with Gu Lu's requirements.

thereupon

After Gu Lu put forward this idea, Director Wen quickly agreed with Gu Lu's point of view.

"Go downstairs to the material processing room. ”

That's it.

Gu Lu and Director Wen began their 321st attempt.