International students returning to 90

Rose, oh no, it’s the h-BN ceramics remelting work that started immediately. Tony sucked a mouthful of yogurt to settle his breakfast. He Qun looked around and saw only the bright red apple standing alone on top of the data box. Gritting his teeth, he took the apple and took a hard bite.

"Ready...ready, Researcher Lin, let's start!"

Lin Yi glanced at him, "OK."

The next step is to practice Lin Yi’s idea. The h-BN matrix composite material is based on h-BN ceramics, adding other material powders, and sintering at high temperature to produce a composite material that is compatible with the channel material of the Hall thruster.

The choice of this other material was a key point in this experiment.

There are tens of thousands of materials in nature, some naturally occurring and some artificially synthesized. There are countless possibilities for the combination of materials and materials. This has been mentioned in high school chemistry textbooks.

Almost all material science experiments are looking forward to the possibility between materials and trying to find the laws and clues that burst out this possibility.

Now their goal is clear, to improve the resistance of the composite material to ion sputtering.

The combination of materials is the same as heredity. Both parents have double eyelids, and the child's double eyelids may also be larger. Therefore, in the screening, they chose the anti-ion sputtering performance and the sintering point is similar to h-BN ceramics. Material.

"There are five high-pressure sintering furnaces in the laboratory, two for us, two for the Ford Center, and one for the rest of the project department. Tomorrow is Christmas, and the furnaces in the laboratory are all empty. I will ask Professor Logan for the key. , we use five together to save time." Tony said.

Lin Yi nodded. Although he already knew which material was the most suitable for forming composite materials with h-BN ceramics, in order to realize the rationality of the experiment, he selected several materials with good composite reactions, plus other materials. There are a total of 61 kinds of compound conditions.

Even if it is done 24 hours a day and night, the high-pressure sintering of these materials and h-BN materials alone will take half a year.

It's really slow.

If a researcher knows what Lin Yi is thinking, he will definitely spit on his face. Even though there have been many research materials on the application of h-BN ceramic materials in the Hall thruster channel, do you think that a composite The material is so well produced?

Go take a look at the special material companies outside. With a patent for a material, they can make a fortune. There are also those who directly ring the bell on Nasdaq. A new material in less than half a year, there are billionaires on the street Wen!

"Let's find two assistants, He Qun, go to the next project department and pick two experienced ones." Tony said naturally.

If the Simpson Laboratory is a pyramid structure, then the Department of Aeronautics and Astronautics must be at the top of the pyramid, and the researchers, research assistants and assistants below, that is, handymen, are all sharpening their heads and squeezing upwards. There is almost no chance of crowding.

However, the research assistants of the Department of Aeronautics and Astronautics are very likely to become researchers in the project department below. For example, Thomas, Tony's assistant, has been a research assistant for seven or eight years. If it were not for Lin Yi's airborne, he would most likely be able to get a General Programs Department Researcher positions.

Therefore, Tony didn't think He Qun's job was any difficult. He just had to go to the nearby laboratory, find two people who were pleasing to the eye, and just call them over. They would definitely cry and thank him.

He Qun subconsciously cast his gaze on Lin Yi.

"Look for someone who can do things and stay up late." Lin Yi said, he paused, "If you can't speak well, use your brain."

He Qun swallowed his saliva when he heard the words, bid farewell to his researcher with an expression that the wind is blowing, the water is cold, and the strong man is gone and will never return, and then he floated out of the gate like a wandering spirit.

"h-BN powder and other material powders need to be mixed for 24 hours before hot pressing and sintering. During this period, we analyze the properties of eight groups of crystals with different sizes. In your words, this can produce a good paper. "

Tony's eyes lit up when he heard the words, "Good idea"

On the other hand, He Qun lingered at the door for a long time after he walked out of the Department of Aerospace and Aeronautics. He wanted to rush in countless times and tell the two researchers who "don't know the sufferings of the world", or...or you can go find it yourself.

But he... dare not.

He Qun felt that he had improved a lot in the past few days. During the experiment, he even forgot that he had social phobia. He felt that being able to be with that beautiful and speechless machine every day was the most wonderful thing in life.

And every time he finished an operation, the admiring eyes of Researcher Lin and Researcher Bryce made He Qun feel as if he drank a whole bowl of hot milk in the winter, which was warm.

Experiment time is very precious, and it takes a long time for newcomers to get familiar with the experiment.He Qun watched the second hand in his watch keep moving forward, and his heart seemed to be a flame that was about to burst out, restless and enthusiastic.

He took a deep breath, as if making up his mind, he moved towards the next laboratory in small steps.

He Qun is really a very inconspicuous person, just like now, he entered someone's laboratory, but no one found him. Of course, maybe they found out and just ignored him.

"Proficient, proficient, proficient." He kept repeating in his heart, and slowly moved his steps closer to a young man with a serious face.

Joson Leo, a fourth-year student at Berkeley, has been working as a small assistant in the Simpson Laboratory for a year and a half. The spirit is still worth learning.

In terms of experimental operation alone, he is the best of the assistants.

"You... hello." He Qun mustered 12 courage and opened his mouth.

Seeing that it was He Qun, Qiao Sen gave him a complicated look, "What's the matter?" He Qun's triple jump left a "shadow" in the hearts of all the assistants.

"Can you...can you help us! Go to the Ministry of Aeronautics and Astronautics, there is an experiment..." He tried his best to organize his words, his face flushed!

"Boom." It was the sound of the pause button being pressed on the machine. Qiao Sen couldn't believe his ears, "What did you say? You asked me to go to the Department of Aeronautics and Astronautics!"

He Qun was taken aback. He met Qiao Sen's enthusiastic gaze and felt his scalp go numb, but he still nodded vigorously, "Stay up all night!"

stay up?I am also willing to suffer!Qiao Sen yelled in his heart that he understood his situation very well, and he would graduate soon, that is to say, if there were no accidents, he would leave Simpson, one of the most high-end materials laboratories in the United States, soon.

As a material science student, this was an extremely cruel thing for him.But He Qun said, let him go to the Department of Aeronautics and Astronautics?

Maybe he can only participate in one experiment, but for him, this is a turning point. Even if he still can't stay in the end, but he has participated in the experiment of the Department of Aeronautics and Astronautics of Simpson Laboratory, which itself can become the most important thing on his resume. A brilliant stroke.

"Thank you, He, I will remember you." Qiao Sen gave He Qun a strong hug, successfully turning He Qun into a rigid sculpture.

"To the Department of Aeronautics and Astronautics? The experiment by Bryce and Researcher Lin?"

"The high-pressure sintering furnace rang all night two days ago!"

"He, can you be the master? Is there still a shortage of people? What do you think of me?"

Someone overheard the conversation between the two, and grasped the key information at once.He Qun was instantly surrounded by assistants, and many people who could be named but couldn't be named all gathered around him with smiles.

He Qun felt that it was difficult for him to breathe, but there was a feeling in his heart that he had never felt before. Is this a researcher assistant?

He remembered the laboratory ecology taught in the professor's class. Researcher assistants are attached to the researcher. If the researcher is excellent, the researcher assistant is like a ladder to the sky. It is only a matter of time before the researcher's success.

Imagining Lin Yi immersed in writing and drawing, He Qun suddenly felt "proud" in his heart, like a rabbit, with a tiger clearing the way in front, it can hold its head high when encountering a fox and leopard.

If you can't use your mouth, use your brain.Lin Yi's words appeared in He Qun's mind.

"The two researchers said... You need to be familiar with it, Qiao Sen and Andri." Qiao Sen and Andri are the two best assistants in Simpson's laboratory. After working together for more than half a year, I naturally understand their temperament.

When they heard that they were appointed by the researcher, they were all disappointed, but they cheered up and said to He Qun with a smile that next time they would speak well of them in front of the researcher.

He Qun is a person who can't lie, and in the name of Tony He Linyi, he has turned red from his toes to the top of his head, but He Qun has always been in such a state when talking to people, and no one pays attention. Slowly spread out contentedly.

Only Xu Dongkui stood still. He looked at He Qun, and suddenly said, "Does Researcher Bryce remember the names of Qiao Sen and Andri?"

Will the researcher bother to remember the assistant's name?It's not impossible, but the chances are extremely low. They can't even recognize the research assistants, or even the colleagues who are also researchers. How can they bother to remember the names of those little assistants, not to mention that Bryce is notoriously bad-tempered. get along.

Qiao Sen stood in front of He Qun without leaving a trace, "He, let's go, I can't wait."

"Me too, I'll go up with the cup." Andri also answered.

As soon as Xu Dongkui reminded them, the two felt something strange, but so what, they were the beneficiaries, and He Qun said it was said by the researcher, so it must be the researcher, and it has to be so.

Xu Dongkui smiled, stopped talking, turned and left.

He Qun took the two of them back for a business trip, and Qiao Sen and Andri watched He Qun with a card to open the door of the Department of Aerospace Engineering almost enviously.

"Are you back? You moved quickly. Just now I bet you had to go out for two hours. Lin said that one hour is enough. It turns out that the researcher knows his assistant best." Tony looked up with a smile when he saw He Qun.

"Both of you, introduce yourself, He, display these data in tabular form, and arrange them in descending order of performance priority, eight groups, each corresponding to 61 materials, 480 eight experiments, oh, I'm going crazy!" Tony said. She looked unlovable, but her eyes were full of excitement.

Johnson and Andri looked at each other. Sure enough, Researcher Bryce didn't know them at all.

After the two briefly introduced themselves, Lin Yi walked over from the experimental bench, "I made a set of demonstrations, follow my example and prepare the materials."

The two are like two rabbits, jumping obediently like a test bench, 480 eight experiments, what a wonderful thing.

"It is impossible for us to do all of the 480 eight experiments. After the samples come out, we need to conduct a performance test. When we get the results, we don't have to spend Christmas next year." Lin Yi said.

Tony rolled his eyes at him, "Are you still counting on Christmas next year? NASA gave three years to the Hall Thruster Passage project. Why do you think Professor Simpson gave me such a big project? Because he feels that three years is too little time, this is an impossible task, and he still has..."

"Hey, that's not the point. The point is, you have to be prepared for a long-term struggle."

Lin Yi didn't refute, "Two hours are up, the drying should be finished, we can do the density test."

"The photoelectric analytical balance, bring it here."

"He Qun, has the measured value in the water come out?"

"Universal testing machine is not used in this way!"

"Use 2000-grit sandpaper to polish, and use 1500-grit sandpaper to grind the chamfer on the long edge. Do you not know English letters or Arabic numerals!"

The priority determination was done by Lin Yi and Tony himself. After a long discussion, they decided to use the Archimedes drainage method to test the density of ceramic blocks, and the three-point bending method to measure the flexural strength and elastic modulus. The fracture toughness was determined by the point bending method.

The formulas are densely written on a blackboard. If the math scores are poor, it is really shameful to enter the laboratory door.

Just for the priority determination, it took a few people five days to do it. This measurement requires high requirements and is related to the progress of the experiment. Every calculation step and every number are calculated by the two of them personally. After you do the calculation, I will After doing the math, finally on the fourth day after Christmas, the priorities were sorted out.

The preparations for the experiment by He Qun and the others have already been completed. This is the first time for Qiao Sen and Andri to participate in such a large experiment process. They both seemed a little excited. He repeatedly praised He Qun for his good vision.

"According to the priority, conduct experiments in groups of [-]. Tony, you take Qiao Sen and Andri, He Qun and I, and we will carry out together."

"No problem!" Tony gave him an ok gesture.

"The sintering temperature is 1350 degrees Celsius, the holding time is 5 minutes, and the pressure is 25 MPa."

"Yes!"

"After 1200 degrees Celsius, pressurize, fill with nitrogen, air pressure, standard atmospheric pressure."

"Okay, Researcher Lin."

The author has something to say: Potential is something that can be squeezed. If you say I am skinny, won’t my conscience hurt! ╰(￣ω￣o)