That night, Yu Zixian and Jiang Yuehua contacted about buying plane tickets.

The two went together to buy a direct flight to Yangcheng the next afternoon.

The next day, Yu Zixian told Fu Zan to pay attention to the implementation of the cooperation with CCTV advertising before the Spring Festival, and then took some information documents and went directly to Yangcheng with Jiang Yuehua.

In the evening, Hao Meng drove to pick him up.

The two, who hadn't seen each other for a long time, came to a friendly hug.

Recently, Hao Meng has been busy with the production of Little Doctor, which is very improving, and it is expected that the output of Little Doctor can be increased to more than 50,000 per month by the end of the year.

Yu Zixian asked Hao Meng to pack up and prepare to go to Xiangjiang together.

Hao Meng has already managed to apply for a Xiangjiang visa, and now he can come and go freely.

That night, after the three of them arrived in Pengcheng, they went to the hotel where Hao Meng had registered to rest for the night, planning to go to Xiangjiang early tomorrow morning, after all, the long-distance trip is also very tiring.

After dawn, the three of them packed up again and set off for Xiangjiang.

After arriving in Xiangjiang, Jiang Yuehua took the materials prepared by Yu Zixian to the headquarters of HSBC, ready to help Yu Zixian handle asset appraisal and credit authorization.

Yu Zixian contacted Tong Ruoyu and Hao Meng planned to go to Cai's wafer factory to have a look in person.

Cai's wafer fab is located in the Kwun Tong District Industrial Park, and the two took a taxi to it again.

In a mountain nest in Kwun Tong District, Yu Zixian found Cai's wafer factory.

Yu Zixian went to the factory gate to report Tong Ruoyu's name, and the doorman made a phone call, and after confirming, asked Yu Zixian and them to wait.

Five minutes later, a small factory car pulled up to the door.

Yu Zixian met Tong Ruoyu for the first time, with a maturity and stability that did not match his thirty years. Tong Ruoyu was the deputy chief engineer of Cai's wafer factory at this time.

After soliciting Yu Zixian's opinion, Tong Ruoyu went directly into the factory and began to visit.

In the clean workshop area of nearly 1,000 square meters, Yu Zixian finally saw the semiconductor equipment in wafer manufacturing that he had been thinking about for a long time.

With Tong Ruoyu's detailed introduction, Yu Zixian has a clearer understanding of this 4-inch wafer production line.

Usually according to the major categories of the production process, it can be divided into more than ten kinds of lithography machines, etching equipment, thin film equipment, etc.

In addition to the wide variety of equipment, the number of equipment on the wafer production line is also large, especially in recent years, with the continuous progress of the manufacturing process towards the micron level, the line width of integrated circuits is getting smaller and smaller, the process complexity is getting higher and higher, and the number of processes required has also increased significantly.

In a production line, there are hundreds or thousands of processes, and there are more than 30 lithography processes alone, among which the key processes at the top have stricter requirements for line width, while the non-key processes at the back have lower requirements for line width.

For example, there are now two or two lithography machines on the production line of the Chua's wafer fab, because not all processes have the narrowest line width.

Wafers have many layers, and only the first few layers need to have the narrowest line widths. Taking the 300nm (3 micron) process as an example, when manufacturing wafers, only the first few layers of lithography have a linewidth of 300nm, which requires a more advanced lithography machine, and the subsequent process, lithography of mediums, metals, and grooves, etc., does not need to use a 300nm linewidth, and a 500nm linewidth can also meet the requirements.

More advanced lithography machines cost more, so rational use can effectively reduce equipment costs.

However, the single machine capacity of oxidation, high temperature, annealing and other furnace tube machines and etching machines is small, which has become the bottleneck of production capacity, and the single machine capacity of CVD equipment, PVD equipment and grinding machine is also small, so the number required is large.

In order to ensure capacity, more equipment is needed to meet the capacity requirements, so the average single machine capacity is small.

Compared with the technical standard of the 4-inch 3-micron process of the Chua's wafer fab, the most advanced fabs in the company or Wanwan are about two generations ahead, and their competitive advantage is greater, and then depreciation is a ruthless move to expand the advantage.

Because the technology gap is several years apart, when the latecomer can buy a large number of new machines and prepare to enter mass production, the advanced has completed the depreciation without depreciation cost, and the latecomer will win in the manufacturing cost.

If the technology and mass production can be ahead for several years, and the depreciation is accelerated by 3 years, the power is even more amazing. Accelerated depreciation in the first 3 years, because there is no competitor to grab the order, the unit price can be so high that even if there is a heavy depreciation cost, it can not be a loss and even a small profit.

A few years later, when the opponent also has this technology, the depreciation cost part of the cost of the advanced factory is already zero, and they use this depreciation cost advantage to beat you to death in terms of price until you can't hold it anymore. So people who are really leading in technology will ask for accelerated depreciation.

Just like now, for Boss Cai, the technology of this wafer factory has been outdated, the equipment has begun to be old, and he has no downstream industry support, which can no longer bring him good profits.

Sell it and make the last profit as much as possible.

For Yu Zixian, buying the production line of this wafer factory is a ticket for him to enter the integrated circuit industry, and he should not lose money no matter how he calculates.

The 4-inch wafer fab has lagged behind the advanced process fab for several generations, but it can be used.

After all, when Intel made the 8086 CPU, although it was a 3-micron process, the wafer used was 2 inches, which only held 29,000 transistors.

With the current process, this wafer factory can produce 8,000 pieces a month, and even according to the average yield rate of 68% said by Tong Ruoyu, it can produce more than 100,000 3-micron IC chips a month. It's perfectly fine to meet the needs of your own product.

At present, the domestic process of the republic is not even 3 microns, but 5 microns. Although some factories are engaged in joint ventures to negotiate the introduction of 3-micron technology, it has not yet been fully implemented at this time.

What's more, there are skilled workers that Yu Zixian values more, and engineers in key positions on various production lines.

These talents are Yu Zixian's spark, just like Tong Ruoyu.

This fab allows Yu Zixian to have all this in advance. Even Yu Zixian feels that at this moment, the wafer factory is more urgent than the processing technology.

After all, the wafer factory determines the size of the production capacity, and the production capacity is too small, and the process is useless no matter how advanced it is!

Of course, the price of $3.5 million for the 4-inch production line is not cheap for Yu Zixian now.

However, compared to the new production line, this is extremely affordable.

Now the key is how to negotiate the price with Boss Cai. And judging from the current situation, it seems that there is still a lot of room for this price to be suppressed.

A production line has been depreciated for 5 years, which means that it has a value of $0 left on the company's internal books. Even now, if it can be sold for $2 million, Boss Cai should be happy in his heart.

It's just the greed of the merchant that makes him raise the offer vigorously.