Fu Xin could see that Old Man Huang didn't like it, and he could guess why Old Man Huang didn't like it, if this kind of thing was replaced by Fu Xin, he would also be unhappy, what he had worked so hard to research, but he was danced in front of him, and he completely denied it, and he couldn't stand it as a person!

The production process needs to be improved, and what should be said still has to be said, Fu Xin said: "Old man, don't be angry. I did have a bit of a gaffe just now, because I also know about other metal foils, and this one is better than aluminum foil. ”

"What foil?" Old Man Huang couldn't care about being angry, he grabbed Fu Xin's arm and asked.

Fu Xin didn't sell it on this, and replied directly: "Zinc-aluminum composite metallization film." ”

"Zinc-aluminum clad metallized film?" The old man let go of the hand that grabbed Fu Xin and asked suspiciously.

Old Man Huang had a clue, but he really couldn't figure out why, so he said to Fu Xin: "Let's hear it!" ”

Fu Xin thought back to the knowledge in his mind and replied: "The degree of atmospheric oxidation reaction and electrochemical oxidation reaction of zinc-aluminum composite metallized film is better than that of single metallized film.

In addition, the selection of zinc-aluminum composite metallization film can also be based on the special requirements of the power electronic capacitors of the whole machine, such as safety explosion-proof requirements, etc., the use of zinc-aluminum alloy thickened edge area evaporation of safety metallized polypropylene film with fuse inside to make safety explosion-proof capacitors, the capacitor can be automatically opened in the case of overload, quiet and no damage.

Due to the high pressure resistance of the membrane, at 20°C, it is about ≥250V(AC)/μm; Therefore, the use of safety film can save 26% to 46% of the material compared with ordinary aluminum metallized polypropylene film, which can save the cost of explosion-proof devices, thereby enhancing the competitiveness of the capacitor market.

In addition, the thickened wave slitting of the zinc-aluminum composite edge, that is, the high-temperature polypropylene film that increases the gold spray contact by 100 times, may be the best metallization solution. It makes the most of the advantages of both metals while avoiding their respective weaknesses as much as possible. At the same time, the polypropylene film with thickened wave slitting on the edge of the zinc-aluminum composite has a higher dielectric strength, which is 40% higher than that of the aluminum metallized polypropylene film on average. ”

The more Old Man Huang listened, the more credible he felt, so he immediately picked up paper and pen from his hand and recorded them.

After Fu Xin finished speaking, it took a while for Old Man Huang to finish recording what Fu Xin said, and then he said: "What you said makes sense, but I still have to go to the specific experimental process to test!" ”

Fu Xin didn't object, nodded, and said: "I know, this is the rigor of science, and it is necessary to go to the laboratory for testing, and I don't have any opinion on this." ”

Fu Xin could even say this, and Old Man Huang also began to suspect that Fu Xin knew something else, so Old Man Huang said to Fu Xin: "I know that you know more than this, what else do you know, let's hear it!" ”

Fu Xin nodded and said, "I also know some of the production process of polypropylene capacitors with zinc-aluminum composite metallization film as electrodes. ”

"Production process?" Old Man Huang's eyes widened, this is equivalent to having a ready-made improvement plan, Old Man Huang grabbed Fu Xin's arm in disbelief and asked, "Where did you learn about it?" Is this kind of material still there? ”

Fu Xin shook his head and said: "No way, this is what an old professor I met before told me, he said that this was his pride, and later, he passed away, and now the information or something, it will definitely not be possible." After speaking, Fu Xin still had a sad look on his face.

How could ordinary researchers tell their research results so casually, so Mr. Huang had already concluded that this was the sin created by the great turmoil, so Mr. Huang couldn't help but complain: "How many national pillars have been killed in that great turmoil!" What a sin......! ”

This scene seemed to be more sad for Old Man Huang, but he couldn't let this emotion spread, Fu Xin immediately said: "Old man, the old professor who didn't tell me his name left with a smile, so let's talk about the production process of this polypropylene capacitor with zinc-aluminum composite metallization film as the electrode!" ”

"Hmm!" Old Man Huang nodded and said, "Tell me about it, I'm fine, some old friends left in that turmoil, just a moment of nostalgia!" ”

Fu Xin did not hesitate, he knew that when he talked about technology, Mr. Huang would listen carefully, so he said: "The use of high-temperature polypropylene film with zinc-aluminum composite edge thickened wave slitting is the most critical step in the development of high-temperature polypropylene film power electronic capacitors, but with this key, it is necessary to conduct research on key processes to ensure the quality of high-temperature polypropylene film power electronic capacitors." Let me first talk about the control of winding in this production process! ”

When Fu Xin said this, he looked at Old Man Huang, and Old Man Huang was also ready, nodded at Fu Xin, and motioned for him to continue.

Fu Xin continued: "First of all, the winding room should use a clean room with temperature, humidity and cleanliness control as much as possible, and its temperature should avoid drastic changes, with a temperature difference of ≤ 10 °C, a humidity ≤ 50%, and a cleanliness ≥ 10,000 to prevent oxidation of the metallized film and pollution of dust particles.

Secondly, the plastic mandrel with high temperature resistance should be used as much as possible during winding to prevent the capacitor from shrinking and squeezing the mandrel during heat treatment, which will cause the capacitor capacity to be lost and prematurely aged.

Finally, the winding tension is 0.5~0.7× film thickness (μm) × film width (mm) ×0.0098 (n)"

After a while, Old Man Huang spoke: "You repeat the formula for calculating the winding tension on one side, I was fascinated by it just now, and I didn't remember it clearly." ”

Fu Xin nodded and repeated: "The winding tension is 0.5~0.7× film thickness (μm) × film width (mm) ×0.0098 (n)"

"Hmm!" Nodding, Old Man Huang finished recording, and said without raising his head: "Go on, it is impossible to make capacitance for the control of light winding. ”

Fu Xin didn't listen to Old Man Huang's words, but said: "Old man, you digest these contents first, and I also need to think about the later content." ”

Old Man Huang raised his head, glanced at Fu Xin, and didn't speak, he originally wanted Fu Xin to finish talking about it once and then think about it.

Seven or eight minutes passed, and Old Man Huang was still thinking. Fu Xindu moved two chairs to the side, sat down first, and let the old man Huang, who was thinking with his eyes closed, stand first.

After a while, Old Man Huang opened his eyes, Fu Xin first asked Old Man Huang to sit down, and then said: "After speaking, the control of the winding, of course, below is the control of the end face spraying gold." ”

After a pause, Fu Xin continued: "Because this high-temperature polypropylene film uses thickened metal edges, the gold spray contact at both ends is better, and it can accept a larger inrush current, that is, the impulse current, to ensure the safety of the capacitor and prolong the life of the capacitor.

Good gold spraying is indispensable for high-quality capacitor performance, especially in high temperature environment, the defect of gold spraying at the end will increase the contact loss between the gold spray layer at the end and the metallization film, bring irreparable damage to the capacitor, and seriously open the capacitor. Therefore, the gold spraying on the end face should be strictly controlled. ”

Old Man Huang nodded and said, "I can figure this out, you go ahead and talk about how to do it?" ”

Fu Xin didn't go around the bend, grabbed a handful of it on his head very unvividly, and said: "First of all, we must avoid mechanical damage or chemical pollution on the end face of the capacitor, for example, oily substances."

The second is to ensure that the compressed air is pure and free of water and oil.

Third, adjust the optimal gold spraying parameters.

Fourthly, an oxygen acetylene flame gun should be used: the distance from the gun to the gold-sprayed end should be 360mm. The temperature generated by the arc gun is low, so the distance between it and the end face can be between 250mm~350mm.

Finally, the first pass of gold spraying material is preferably pure zinc metal, and the second pass is tin-zinc alloy or babbitt. The total thickness of gold spraying should be between 0.3mm~0.45mm, and multi-cycle gold spraying should be used to avoid overheating to the end. ”

Old Man Huang wrote very quickly, and quickly recorded what Fu Xin said, and then said: "You don't have to give me time to digest this, you need to go to the actual operation to know." ”

"Okay!" Fu Xin responded, and continued: "The last is the choice of heat treatment. The purpose of heat treatment is to stabilize the mechanical and electrical properties of the capacitor and to exclude air and moisture. If properly heat-treated, it can even prevent zinc oxidation in the atmosphere. During heat treatment, the oven should ensure air circulation and uniform temperature distribution. Heat treatment does not have to be carried out under vacuum, but the vacuum environment can better remove air and moisture.

Therefore, if the edge thickened high-temperature polypropylene film capacitor has not undergone heat treatment or the heat treatment is insufficient, the capacity loss will be more significant and the loss value will increase. In addition, heat treatment must be carried out after gold spraying. I will draw a table for the heat treatment temperature and time of high temperature polypropylene film capacitors. This is even more obvious from the table. ”

Old Man Huang immediately pointed to the workbench next to him, and motioned for Fu Xin to go to the table to get paper and pen to draw out, and he also needed to record what Fu Xin said.

Fu Xin did not hesitate, picked up a piece of white paper and a pen from the side, drew a table with four rows and three columns on the white paper, and wrote the diameter of the element (mm), the maximum temperature (°C), and the time (h) in the three grids of the first row.

Then Fu Xin filled in the three grids below the column of component diameter with three data of less than forty, forty to sixty-five, and greater than sixty-five, and filled in the column of maximum temperature with three data of one hundred and thirty-five, one hundred and thirty, and one hundred and twenty-five, and three data of four, six, and eight in the column of time, which constituted the heat treatment temperature and schedule of a polypropylene capacitor with zinc-aluminum composite metallization film as the electrode.

After Fu Xin finished drawing the picture, after waiting for a while, Old Man Huang recorded what Fu Xin said, and then stretched out his head to look at Fu Xinhua's form, and at a glance, it was very simple, Old Man Huang was puzzled: "That's all?" (To be continued.) )