"Professor Cai, please comment. Pen Fun Pavilion www.biquge.info My student, what kind of technical level can you achieve by using the materials of your school's laboratory to sinter this two-color metal ring?"

As soon as Ye Qing entered, he saw a middle-aged man in a blue suit with some acne marks on his face, laughing and patting the young student next to him as if he were shooting a slot machine.

In this student's hand, there was a metal ring that attracted Ye Qing's attention.

It is a metal ring with a square cross-section, the same size as a normal bracelet.

The metal rings sintered in the powder metallurgy laboratory are naturally processed by powder metallurgy technology. But this metal ring is half golden and half silver.

The most important thing is the intersection of the two colors, without any traces of splicing and polishing, it is completely integrated.

"It's ...... Terrible. "Zhongyun University is leading the team here, and it is Professor Cai Chenning. At this moment, I don't know if the temperature emitted by the sintering furnace in the room is too high, or something else. Anyway, Professor Cai Chenning's forehead was already covered with fine beads of sweat.

However, on the side of the Japanese University of Science and Technology, they all looked pleasant, and there were no beads of sweat on their foreheads.

"Then can you also ask your school to show us the powder metallurgy technology?" Professor Kobayashii, who led the team of the Japanese University of Science and Technology, bent down to make an inviting gesture: "It doesn't have to be sintered together, the others are fine, as long as your school thinks it is advanced." ”

Lost another game......

The green tendons on Professor Cai Chenning's forehead jumped back and forth.

In terms of ranking, there is no doubt that the Japanese University of Science and Technology is much stronger than Zhongyun University. However, Professor Cai Chenning previously believed that this academic exchange was not the most cutting-edge national industrial laboratory technology competition between the two countries.

It's all college students to college students, even if there is a technology gap, it doesn't mean that Zhongyun University has nothing that can't be used to open the eyes of the students of Ri Polytechnic University.

However, the fact turned out that Professor Cai Chenning's heart was about to jump out.

Up to now, there have been a total of seven technical competitions, and Zhongyun University has only pulled back one game.

Sure enough, the game they lost in the morning was found in the afternoon.

In the afternoon, when he came to visit the powder metallurgy laboratory, Professor Kobayashii, who led the team, couldn't wait to let one of them use the materials in the laboratory to give a good lesson to the students of the Department of Mechanical Engineering.

Dissimilar metal sintering.

In the field of industrial processing, such a problem is often encountered.

How to weld two metals of different materials together?

As the saying goes, different things don't work together, and the same applies in the metal welding industry. Different metals are forced to weld because of the different melting points and characteristics, and they will definitely fall to the ground because the strength of the welding is too low, and "snap~" will be broken into two.

The welding of dissimilar metals is extremely difficult, not only requires a very deep understanding of metal materials, can come up with various flux solutions according to local conditions, but also masters the welding technology like a grandmaster, in order to weld industrial parts with qualified strength.

The people who master this technology are all treasures that major factories compete with each other.

In powder metallurgy, the sintering of dissimilar metals is also a big problem.

Because of the difference in the melting point of the metal, it is necessary to add a layer of adhesive that can stick the two materials at the bonding place of the two metals. In this way, if you want to sinter a qualified product, you often have to scrap more than a dozen products.

The congenital deficiency is destined to be a very niche and very advanced processing technology, whether it is dissimilar metal welding or dissimilar metal sintering.

However, just this afternoon, a graduate student of the Japanese University of Science and Technology succeeded in sintering a perfect dissimilar metal ring with two metal powders, silver and copper, without adding binders.

It's just that this product is not a useless product.

In order to prove this, the student has already handed over his work to Zhongyun University and tested it with a tensile tester.

"Professor Kobayashii, it's not early, I think the students of your school must be hungry, tonight the cafeteria has specially prepared a roast duck with sliced skin for everyone, why don't you let the students chat while eating?" Professor Cai Chenning helplessly played a sloppy look, and also admitted in disguise that the students of Zhongyun University could not come up with similar powder metallurgy technology.

The Japanese University of Science and Technology sent a graduate student, so according to the conventional rules, Zhongyun University can only send graduate students or college students.

Professor Cai Chenning can't always play in person.

"Not hungry, not hungry. Kobayashi Jing raised his head, and two smug glints shot out of his eyes: "Tanaka, you can communicate with them, the firing skills of different metals." ”

The student holding the metal ring raised his head proudly and looked around the audience: "The physical properties of different metals vary greatly. The primary sintering technique I use is the base gradient joint principle. The two metal powders are placed one by one in a mold and pre-pressurized, followed by sintering in an electric furnace, which is the most demanding in terms of temperature control. ”

"The melting point of silver is 961 degrees, and the melting point of copper is 1083 degrees. The trick of how to find the balance point of the melting point of these two metals is on top of the different pressures applied to the powders of the two materials. Because of the density of the voids between the materials, it determines the melting rate. ”

The students at Zhongyun University avoided Tanaka's gaze one by one.

If you lose, you lose, who makes technology inferior to people?

Fortunately, this Tanaka student did not take the opportunity to show a wave of superiority, otherwise they would have the heart to find a crack to get into.

Tanaka's people are good, not only do they tell the technical points, but they don't hit people.

It's because these students are too naïve, and the Japanese University of Science and Technology came across the ocean and didn't hit people, so wasn't it in vain?

"Just ......"

"During the operation, I found several problems. ”

The student, Tanaka, suddenly changed his words, and his tone became proud: "Your equipment is too backward, in our school's laboratory. The stamping machine used for pressing embryos is a multi-angle CNC punching machine of Yamazaki Mazak Company. ”

"Even if the angle of your device is not adjustable, even the impact coefficient is not adjustable. ”

"In our school, the scrapped equipment piled up in the warehouse is also more advanced than yours. ”

"There are also these metal powders, as early as the sixties of the last century, Professor Ryoji Ueda, invented the preparation technology of ultrafine metal nanoparticles. Tanaka twisted the metal powder left on his fingers: "But you still use this thing as thick as flour." ”

"The most critical electric sintering furnace is not even as good as our technology in the last century. The laboratory should have the appearance of a laboratory, and how can the progress of powder metallurgy technology be promoted with this kind of obsolete equipment?" )