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The solution to this contradiction is not only to use more expensive and advanced materials, but also to heat treat them, such as quenching, carburizing, and nitriding. At present, many manufacturers who have submitted samples have adopted various heat treatments, and the preliminary testing also meets the requirements. However, the mechanical properties of the gears improved by heat treatment methods cannot ensure sufficient safe use time, and they often only last for about 300 hours in high-temperature, dusty, and high-humidity environments.

Some manufacturers have adopted electroplating or surfacing technology, covering the surface of the gear with a layer of durable and high-temperature resistant metal or metal alloy, but the effect is still not very ideal.

Is it that the world's processors are helpless about this? Apparently not, if so, the French company VoRou would not have designed such a gear, and would not have invited external tenders. In fact, some people know that if a special method is used to deal with gears, all the problems can be solved. It's just that this special treatment method is too costly and has too many side effects, and no manufacturer is willing to try it.

This special method was developed by an Australian scientist two years ago, called the S-O6 metal device surface treatment method, and he also applied for a patent for it. The principle is to use special catalysts and some special compounds and polymers to strictly control the temperature and air pressure to carry out a set of tedious chemical reactions, and finally form an alloy layer with a thickness of about nine microns on the surface of the gear, so as to increase the wear resistance of metal devices and maintain their inherent mechanical properties for a long time.

The S-O6 method is different from the more advanced surfacing technology on the market, it is not only a layer of alloy layer with excellent hardness and strength evenly stacked on the protected surface, but also the crystal structure of this layer of alloy that grows inside the matrix under special conditions, so that the alloy layer and the matrix are better fused into one, so that the protected surface is more protected.

This layer of alloy has greater toughness and yield strength than the alloy layer formed by hardfacing technology, which can greatly increase the lifetime of the device.

However, this S-O6 method has a disadvantage that cannot be ignored: that is, the reaction conditions are too harsh. It not only consumes a lot of labor and electricity, but also consumes a lot of precious metals, and what is more troublesome is that the waste, waste water and waste gas produced are highly toxic. One of the most severe is the danger of the heavy metal cadmium, which is difficult to avoid, and cadmium metal with a low boiling point will spread around during chemical reactions.

In order to reduce the danger of cadmium metal, processing enterprises must pay a lot of money to do protection work, and must invest a lot of money to clean up the polluted environment.

Cadmium (Cd) is a highly toxic heavy metal, cadmium will irritate the respiratory tract, long-term exposure will cause anosmia, gingival macula or gradually yellow circles, cadmium compounds are not easy to be absorbed by the intestines, but can be absorbed by the body through breathing, accumulated in the liver or kidneys to cause danger, especially the most obvious damage to the kidneys, but also can lead to osteoporosis and softening.

It is precisely because of the danger of cadmium and the difficulty of controlling environmental pollution that most companies have to avoid the S-O6 method, and only when it comes to heavy Dà projects, they have to use this method to process.

The French company VoRou is not willing to go out of its way for a few hundred sets of gears, to pay a hefty fine for offending the environmental authorities, or to pay sky-high damages if it is sued by residents in the future. They would rather pay a premium to buy from other countries. They believe that as long as they quote a high price, as long as they lie that if anyone can deliver this batch of gears on time, who will continue to get a steady stream of large orders from VoRou in the future, there will definitely be companies that will be tempted, and there will be companies that use the s-o6 method to process the gears for their VoRou company.

There is a good saying in the Chinese saying that money makes the devil grind, not to mention that many countries in the exhibition are very short of money, and these countries are not strict about environmental protection, and there will be enterprises in these countries eager to try.

There are many businessmen in the world who see money and can ignore any moral bottom line in order to make money, so they think that as long as they throw bait, they will be hooked.

Sure enough, after the tender went out, many companies sent gear samples. Many of these companies come from China, India, Brazil and other countries, as well as from Australia, New Zealand, the United States, Canada and other countries, and even from France itself.

At first, VoRou was very happy to see so many samples coming in one after another, but after taking apart and looking at the sent gears, he could only shake his head: none of the products were qualified.

Don't think that the technicians in charge of testing in the French company will be too busy with so many samples, in fact, this kind of inspection is very easy, just see if there is a dense alloy layer on the gear. This simple test passed more than 95% of the samples, and only a few companies' products barely entered the next more rigorous test.

……

Ms. Wang's company is just one of hundreds of companies around the world that have been tempted or deceived.

There are many people and companies who have seen through the evil intentions of this French VoRou company, and know that it is the French VoRou company that is passing on the pollution problem to other countries, especially poor countries. But most of them have the mentality that more is better than less, and they have not come forward to accuse VoRou of not having a conscience in the industry. In their minds, this is a willingness to fight and a willingness to suffer, since you want to make money, then you have to be prepared to harm the environment.

There are also some journalists or lawyers who have dark hearts, and they are quietly waiting for others to take the bait with excitement. As long as someone takes this method to process metal parts, they will represent justice and justice to check each other's environmental protection measures, they will scold on TV to show how socially responsible they are, they will encourage the surrounding residents to fight environmental protection lawsuits with each other, and propose high compensation, which is another vigorous news event, how good.

Even if the company is in a country beyond their reach, they will stand on the moral high ground to attack the other side, make the evil countries shameful, and in turn improve the image of themselves and their own country.

Therefore, the bidding of the French VoRou company is not only smooth sailing, but also a lot of people to add fuel to the fire, some media in the newspaper to publicize how high the technical content of this gear is, saying that the company that can make this kind of gear is an enterprise with strong technical strength, and will definitely be able to rank among the world's top 500 or something in the future.

Some people also "generously" revealed the processing method of S-O6 to the outside world, reminding those companies who do not know this method to try.

Contrary to the reaction of the outside world, VoRou, as the person concerned, was in a hurry: because the delivery deadline set by the military was getting closer and closer, and none of the gear samples received in the past three months were qualified, and the qualified finished product was far away. Reluctantly, a few companies have applied an alloy layer containing cadmium to the surface of the gear, but the quality is still not good.

I don't know if they didn't fully master the S-O6 method, or because they didn't dare to fully adopt the S-O6 method, or they took their own method,......, anyway, these samples did not meet the relevant technical requirements.

Their current bidding can be said to be lifting a stone to hit their own feet, and it is really difficult to ride a tiger. Knowing that the result was like this, it was better not to bid and secretly use the S-O6 method to process it, although it is still possible to be condemned by the media now, and it is possible to be complained by the surrounding residents for compensation, but at least it will not alarm so many people's attention as it is now, and it will not become the focus of the media, or many people can settle things with a little money.

But now it's hard to settle down.

After some painful discussions, the executives of VoRou had no choice but to make a decision: