"Professor Cai, please comment on it. My student used the materials in your laboratory to sinter this two-color metal ring. What kind of technical level can it reach? "
As soon as Ye Qing entered, he saw a middle-aged man in a blue suit with some acne marks on his face. He laughed and patted the young student next to him like a slot machine.
In the student's hand, there was a metal ring that attracted Ye Qing's attention.
This was a metal ring with a square cross-section, the size of which was equal to that of an ordinary bracelet.
The metal ring sintered in the powder metallurgy laboratory was naturally processed with powder metallurgy technology. But this metal ring was half golden and half silver.
The most important thing was that there was no trace of splicing and polishing at the intersection of the two colors. It was completely integrated.
"Very... amazing." The leader of Zhongyun University's team was Professor Cai Chenning. At this moment, he didn't know if the temperature emitted by the sintering furnace in the room was too high or for other reasons. Anyway, Professor Cai Chenning's forehead was already covered with fine beads of sweat.
However, on the side of Japan University of Technology, everyone looked happy and there were no beads of sweat on their foreheads.
"Then can I ask your school to show us powder metallurgy technology?" Professor Kobayashi Well, the leader of Japan University of Technology, bent down and made an inviting gesture. "It doesn't have to be two kinds of metals sintered together. Others are also okay, as long as your school thinks it is advanced."
Another game was lost...
The blue veins on Professor Cai Chenning's forehead jumped back and forth.
In terms of ranking, there was no doubt that Japan University of Technology was much stronger than Zhongyun University. However, Professor Cai Chenning had some simple thoughts before that this academic exchange was not the most sophisticated national industrial laboratory technology competition between the two countries.
They were all college students against college students. Even if there was a technical gap, it did not mean that Zhongyun University had nothing that could not be taken out to open the eyes of the students of Japan University of Technology.
However, the results of the facts made Professor Cai Chenning's heart jump out of his chest.
So far, there have been a total of seven technical competitions, and Zhongyun University only recovered one game.
Sure enough, they got back what they lost in the morning.
When they visited the powder metallurgy laboratory in the afternoon, Professor Kobayashi Well, who was leading the team, couldn't wait to have one of his students use the materials in the laboratory to teach the mechanical engineering students a good lesson.
Sintering of dissimilar metals.
In the field of industrial processing, such a problem was often encountered.
How do you weld two different metals together?
As the saying goes, those who walk different paths cannot make plans together. This saying also applies to the metal welding industry. Due to the different melting points and characteristics of different metals, if one were to forcefully weld them together, it would definitely fall to the ground and break into two pieces because the strength of the welded area was too low.
It was extremely difficult to weld dissimilar metals. Not only did it require a very deep understanding of the metal material, but it also required the ability to come up with various flux solutions according to local conditions. It also required the mastery of grandmaster-level welding techniques in order to weld industrial parts with qualified strength.
People who mastered this kind of technology were all treasures fought over by major factories.
In powder metallurgy, the sintering of dissimilar metals was also a huge problem.
Due to the different melting points of the metals, it was necessary to add a layer of adhesive at the junction of the two metals that could adhere to the two materials. In this way, if one wanted to sintered a qualified product, they would often have to scrap more than a dozen products.
Due to the inherent shortcomings, whether it was dissimilar metal welding or dissimilar metal sintering, it was destined to only be a very small and advanced processing technology.
But just this afternoon, a graduate student of the Japan University of Technology successfully sintered a perfect heterogeneous metal ring with two metal powders of silver and copper without adding a binder.
However, this product was not a good-looking but useless product.
In order to prove this point, the student had already submitted his work to Zhongyun University and tested it with a tensile tester.
"Professor Kobayashi Well, it's getting late. I think the students of your university must be hungry. Tonight, the cafeteria specially prepared a piece of roast duck for everyone. Why don't the students eat and chat?" Professor Cai Chenning had no choice but to play dumb. He also indirectly admitted that the students of Zhongyun University could not come up with similar powder metallurgy technology.
Japan University of Technology had sent a graduate student, so according to the established rules, Zhongyun University could only send a graduate student or a university student.
Professor Cai Chenning could not do it himself.
"Not hungry, not hungry." Kobayashi Well raised his head, and two rays of pride shot out from his eyes. "Tanaka, communicate with them about the sintering technique of dissimilar metals."
The student holding the metal ring proudly raised his head and looked around the audience. "The physical properties of different metals are very different. The sintering technique I used is based on the principle of a base gradient joint. First, the two metal powders are placed one by one in a mold and pressurized into shape. Then, the sintering process using an electric furnace has the most stringent requirements for controlling the temperature. "
"The melting point of silver is 961 degrees, and the melting point of copper is 1083 degrees. The trick to finding the balance between the melting points of these two metals is the difference in pressure between the two material powders. Because the density of the gaps between the materials determines the melting speed. "
The students of Zhongyun University avoided Tanaka's gaze one by one.
If they lost, they lost. Who made their skills inferior to others?
Fortunately, this student of Tanaka did not take the opportunity to show off a wave of superiority. Otherwise, they would have found a hole to hide in.
Tanaka was a good person. Not only did he explain the key points of the technique, but he also did not attack others.
These students were too naive. The Japan University of Technology had traveled across the ocean to come here. If they did not attack others, wouldn't they have come in vain?
"It's just …"
"In the operation, I found a few problems."
The student named Tanaka suddenly changed the topic, and his tone became proud. "Your equipment is too backward. In our school's laboratory, we can't do anything about it. In our laboratory, the stamping machine used to press the embryo is a multi-angle CNC stamping machine from Yamazaki Mazak. "
"The angle of your equipment can't be adjusted, but even the impact coefficient can't be adjusted."
"The scrapped equipment piled up in our school's warehouse is also more advanced than yours."
"And these metal powders. As early as the 1960s, Professor Ueda Ryoji invented the preparation technology of ultrafine metal nanoparticles." Tanaka twisted the remaining metal powder on his fingers. "But you still use this coarse flour thing."
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