Chapter 353 Fuel God's Choice

Now that the performance of the propellant has improved, the environment for the throat liner is undoubtedly harsh, and the degree of deterioration is not small.

So, snap!
This is the bad thing that came from a good thing. Since we are all just making do with what we have, we should just make do with what we have.

We agreed that we should all make do together, but you actually rolled it up secretly?
Mr. Song and his colleagues immediately figured out the cause of the problem. It was system engineering. It was impossible to achieve rapid progress by improving any one of the items alone. The correlations and impacts between them were too great.

After finding the reason, they are not too worried. To untie the bell, one must find the person who tied it, so just ask him.

Some people continued to do experiments, some analyzed data, and Mr. Song called Gao Zhendong.

Mr. Song remembered that when the first type of graphite throat lining was being developed, Mr. Gao’s classmate, a young man named Lin, brought back from him several recommendations for materials that could be used for this purpose. Finally, considering the price and weight issues, they chose the graphite from the Carbon Research Institute.

Since there are so many recommendations from consultant Gao, I think he is confident about this issue.

After hearing the situation here, Gao Zhendong smiled and said, "Yes, yes, yes, there is such a problem with the throat lining material. High-performance propellant has an impact on it."

When Mr. Song heard this, he felt relieved: "Director Gao, since you have discovered this problem, have you solved it or found a replacement?"

Gao Zhendong thought for a moment and said, "I have two recommendations for you to consider."

A senior consultant is a stable person. He will give two recommendations right away, and you can choose.

Then I heard Gao Zhendong on the other side say: "First, I have an alloy material here, the melting point is 2600 degrees, and the mechanical strength is also very good."

Melting point 2600? Good mechanical strength? This is it.

"I want this one, I want this one." Mr. Song said hurriedly.

Gao Zhendong smiled and said, "Don't worry, listen to me. The problem with this material is that it is heavy, with a specific gravity of about 15, and secondly, it is expensive."

A few decades later, the price of molybdenum was 6 to 10 times more expensive than copper, not to mention these days.

This made Mr. Song fall into deep thought. Simply being heavy was not a problem. Now that they had new propellants, they were more confident. Although it might bring about a change in the center of gravity, it was not a big problem and could be adjusted.

The high cost is a problem, but it is not unbearable. Missiles these days are not cheap.

Look at these missiles now. Where are they? These are missiles in the greenhouse. Sorry, they are out of place.

But it's expensive and heavy, which is not so good. Well, let's look at the second option and use this one if it doesn't work.

"Second, you can go to your old friend, the Carbon Research Institute. This problem has actually been discovered a long time ago, and they have already developed a better substitute, also made of graphite. Under 5Mpa, with a combustion chamber temperature of 3000 degrees Celsius, the average ablation rate for 60 seconds is 0.0XXmm/s. If it is suitable, you can basically achieve a seamless replacement."

The combustion chamber temperature here is not the gas temperature, it is higher than the gas temperature, but for Mr. Song, it is enough to calculate the performance.

Since they are mainly made of graphite, the density difference will not be particularly large. Based on this, as long as it can be used, this thing is the first choice.

As soon as Mr. Song heard it, he understood that Consultant Gao must have contributed to this material, otherwise he would not have known it so clearly.

After a careful mental calculation, Mr. Song felt that this graphite material should be feasible. He was in high spirits. This problem was discovered and solved so quickly. The comrades in the materials field have done such an outstanding job.

"Thank you, Mr. Gao. Your words have solved our big problem and saved us a lot of time."

This issue is not a stumbling block. After all, we have come to this point and it must be resolved no matter what. Otherwise, wouldn’t the propellant be wasted?

This is not a very difficult problem. At most, you can trade weight for performance. There is still a way to go.

However, the most important time has been saved actually. Otherwise, the delay may be one or two months. This does not include the impact on the entire system caused by using other technical means.

Mr. Song, who was very grateful to Mr. Gao, hung up the phone and called the Carbon Research Institute in a good mood.

After getting the exact information from the Carbon Research Institute, he returned to the test site with a smile and informed the busy comrades of the good news: "Comrades, I have good news for you. After consulting with many units, with the cooperation and efforts of our external technical support and comrades from the Northeast Carbon Research Institute, the problem of the nozzle throat lining has been initially solved!"

All the comrades were a little stunned. They had never enjoyed such treatment where a problem was solved in the blink of an eye. Is this true?
After a moment of silence, everyone reacted and cheered together.

President Song made everyone happy for a while before he smiled and said, "Now, the comrades in charge of structural design will recalculate the weight distribution and other designs based on the new material parameters sent by the Carbon Research Institute. After making necessary corrections, they will send it to the Carbon Research Institute and they will process it for us."

After that, he added: "I will go to the chief designer of the model. Everything is ready except for the east wind. The next step is to prepare to fire the full-range telemetry missile!"
-
In a chemical research institute, a researcher is measuring a sample using iodine titration.

Although the sample was sealed, it still gave off a slight fishy smell, but he couldn't smell it because he was protected by the protective suit and mask.

As the titrant dripped in, the indicator showed color, and the titration reached its endpoint. The researcher began to calculate something with the titration data.

The data is not complicated. According to manual calculation, they have two DJS-60Ds. However, data of this level does not require the trouble of using that treasure.

Soon, a hint of joy appeared in the eyes behind the mask. He finished the experiment, packed up the experimental equipment, and after disinfecting it, he walked to an office with the experimental data.

In the office, several people were discussing something.

"Researcher Yue, the titration results are out. Combined with other test results, the yield of UDMH has reached 45.3%!"

Researcher Yue was delighted when he heard this: "It seems that the choice of this liquid-phase chloramine method is correct. It can synthesize UDMH, is much safer, and has a good yield."

The earliest report on the use of dimethylhydrazine as nitrosation method with dimethylamine was in 1936. In essence, it was the reduction of nitrosodimethylamine, which is a carcinogen.

Later, the gas phase chloramine method was used. The advantage of this method is that the reaction rate is fast, but the process is highly toxic and the reaction is difficult to control.

Our earliest unsymmetrical dimethyl hydrazine was born in 1968. At that time, the scientific researchers took the risk and directly studied the use of liquid chloramine method to synthesize unsymmetrical dimethyl hydrazine, which was successful in one fell swoop.

Although the toxicity of the product itself cannot be changed, the toxicity during the production process can at least be reduced.

Now that this matter has been brought forward so much, researchers still choose this path.

In principle, the raw materials are liquid chlorine, liquid ammonia, dimethylamine and sodium hydroxide. After mixing, they can react at room temperature. To some extent, this is much easier to control than the gaseous state.

If small batches are synthesized in the laboratory, ammonia water, sodium hypochlorite, ammonium chloride, dimethylamine, and sodium hydroxide can be used instead, thus eliminating the step of generating sodium hypochlorite from liquid chlorine and sodium hydroxide.

It can also be seen from here that there are obvious differences between laboratory production and industrial production.

After Researcher Yue finished speaking, he turned around and told the other researchers: "You should distill and concentrate the product as soon as possible, and continue to synthesize it using the existing method, and try to produce a batch of high-purity UDMH that can be used for physical and chemical testing as soon as possible."

After arranging the work, he went to the confidential office and made a phone call: "Lao Cai, please come over. Unsymmetrical dimethylhydrazine has been initially synthesized and the situation is relatively optimistic."

Mr. Cai was overjoyed when he heard this and acted quite quickly.

He was so anxious that he rushed to Researcher Yue's place on the third day. In those days, this speed was absolutely amazing.

When he arrived, the physical and chemical tests on the first batch of high-purity UDMH had been completed, and he only had to read the report.

This report made him smile so much that he couldn't stop.

Freezing point, -57.2 degrees Celsius, OK, it can be used in the north!
Boiling point, 63.1 degrees Celsius, better, can be used in the south!

The specific gravity is 0.79 (20 degrees Celsius), which is similar to alcohol and kerosene. This is good, at least the load-bearing structure of the fuel tank saves a lot of trouble, but I don’t know if the material needs to be changed.

Heat of combustion: 19000kJ/kg. This is a little low, but it’s okay. Let’s look at the specific impulse.

Specific impulse: 260s. That’s it. This is it.

Seeing that he was so happy, Researcher Yue handed him another report: "Here is something else that will make you happy. Take a look. I didn't expect this result."

This is a stability test report. The parameters and data are skipped, but the conclusion makes Mr. Cai very happy - it has good thermal stability and is insensitive to friction, impact, shooting, compression, vibration, etc.

Fuel, I didn’t expect Fuel to have such a good temper.

For Mr. Cai, this means that as long as it doesn't leak, the storage and transportation of this thing are very safe.

To be honest, there is a reason why the Russians have been using this stuff until the 21st century. To them, toxicity? What is toxicity? At least it can ensure that no one drinks it, right?

Apart from being toxic and having a slightly higher maintenance complexity, this thing is simply a perfect choice as fuel for silo-launched missiles.

Seeing his satisfied face, Researcher Yue smiled and said, "Take a look at the back. To be honest, I don't know how talented the comrade who recommended this thing to you is, or how much knowledge he has mastered. He can recommend such a thing to you. It's simply tailor-made for you."

Mr. Cai continued to look back and smiled even more happily.

Compatibility——Aluminum, aluminum alloy and stainless steel have good compatibility.

Compatibility is not miscibility. Compatibility means that two things can coexist peacefully together. In simple terms, it means that aluminum alloy containers and stainless steel containers can both hold this thing.

No, I have to call Comrade Gao Zhendong. I'm so happy that I can't help it!
(End of this chapter)