Zhang Zhitong and a group of policemen are like a group of ignorant college students who stepped into the laboratory for the first time to watch the professors do experiments. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 ｉｎｆｏ

Nervous and expectant, gathered around this German Goldman atomic absorption spectrometer.

The mystery of the concrete wall has been solved, and the remaining safes, as long as the puzzle is solved, they can more accurately locate the criminal's occupation according to the way of committing the crime.

This analysis took a bit of a long time.

Because the sample preparation of the atomic absorption spectrometer is more cumbersome, the test sample must be collected first, the sample is vaporized, and the spectrum generated when the sample absorbs radiation is observed through radiation projection.

This is a very high-tech inspection method, under which all foreign substances are hidden in the hole that has been ablated by high temperatures.

Here's a simple example.

At the beginning, Ye Qing ate the altar chicken in Shanghai, and used the soil method to test that there were heavy metal residues in it.

If you go to the atomic absorption spectrometer to test, don't say that it seriously exceeds the standard. Even if this altar chicken, in a lifetime, has eaten a mouthful of harmful heavy metal food, the spectrometer can also detect it.

An hour later, the test results came back.

The report sheet is full of elements in English and symbols, which the technician specially translated into Chinese. The policemen looked at the elements one by one according to the treasures they had obtained.

ferrous oxide, ferric oxide, aluminum oxide, nickel oxide, magnesium oxide, monocalcium aluminate, calcium dioxide carbonate......

According to the test results, almost all the metal components on the safe were burned into another substance at high temperature.

The test results also indicate the proportion of these components in the sample, with iron accounting for the largest proportion at 55%.

"Wait, shouldn't the safe be metal, why is there non-metallic substances such as calcium aluminate and silicon dioxide in it?"

A sharp-eyed policeman, like Columbus discovering the New World, shouted happily: "These non-metallic substances are probably the key to the destruction of the safe by criminals." ”

"What kind of chemical reaction is used? I remember that these ingredients can be used as chemical additives. ”

Several police officers in the trace evidence examination room immediately began to discuss the use of these non-metallic elements.

"Ahem~"

Ye Qing couldn't bear to interrupt the policeman's "major discovery" and had a heated discussion with them.

"I think...... These non-metallic substances are part of the foamed fireproof insulation material inside the safe. ”

“………”

The small circle from the trace evidence examination room, the atmosphere of heated discussion suddenly became awkward, and their hearts were cold.

"Ye Qing, then it seems that there are no foreign elemental components in the hole ablated by high temperature?" Zhang Zhitong was also very confused, the metal was heated in the air, which would produce an oxidation reaction.

Then a lot of the word "oxidation" on the test report sounds very high, but in fact, it is ordinary iron, aluminum, magnesium, nickel, and what becomes after combustion.

Ye Qing did not answer this question, but continued to look at the test report.

Zhang Zhitong is right, the metal components in the report are all one of the materials used to make the shell of the safe, and there are no foreign substances.

Things seem to have suddenly become unscientific.

There will inevitably be a medium for combustion, which will be lit with a match, and residual elements such as phosphorus and sulfur will inevitably be detected in it. Ignition with mixed flammable gas will inevitably leave behind common residual elements such as alkane, alkene, acetylene, and so on.

This world belongs to science, there is no magic, and there is no cultivation.

It seems unscientific, but it must be a failure to find the real mystery.

The police were completely stunned, and they felt that their IQ was no longer worthy to arrest these mysterious criminals.

Some people are looking at the floor, some are staring at the test report dejectedly, and some people are leaning back in their chairs and sighing, all of which are frustrated and lost that cannot be concealed.

"I see. ”

Ye Qing suddenly showed a confident smile.

This sentence is more effective than a booster. The policemen hurriedly raised their heads and stared at Ye Qing for a moment, while listening to each other.

"There are no abnormal components, but the proportion of the original metal components is not the same. Ye Qing pointed to several metal components on the test report, and the corners of his mouth curled up an arc: "Aluminum, hammer, the composition is wrong." ”

"The addition of aluminum to metal materials can improve the strength and corrosion resistance of the metal. However, the aluminum content in this report exceeded the standard. ”

"The wear-resistant steel used in the safe is usually the KN60 model, and from the metal composition of this safe, it is also used. I remember that in this wear-resistant steel, the proportion of aluminum added is only 3%, and the aluminum detected here accounts for 15%. ”

"The percentage of gills added is even lower, it seems that it is less than 1%, but 5% has been detected here. ”

Isn't it, even what alloy is used can be summed up from the metal composition?

While these police officers admired, they couldn't help but ask, what will happen if there is more aluminum and copper?

"Any alloy formula is the best ratio value obtained after long-term practice and exploration, and no factory will make such a stupid mistake of making the wrong ratio. ”

"Since the factory can't be wrong, it means that the extra aluminum and gilt were added by the thieves. ”

"Add aluminum and gild?" Zhang Zhitong frowned: "What do these people want to do?"

"Iron oxide should also be added, but in the shell of the safe, there is too much iron, and there is not much change from the test report. ”

"And iron?"

"Very brilliant idea. Ye Qing exclaimed: "This group of people is definitely not as simple as understanding industrial processing, but they are very proficient, which can be called the level of engineers." ”

"Thermite reaction, or thermite. ”

"Aluminum powder, iron oxide powder, mixed together, and magnesium powder as an ignition. ”

"With the right mixing, it can produce high temperatures of more than 3,000 degrees Celsius after ignition, and in industrial applications, this method is used to melt refractory metals, or to weld metals. ”

Another unpopular technique was learned by them, and the police listened little by little.

But Mr. Ye said that this method is generally used to melt metal, or weld. That shouldn't be ablative, this kind of hole with bullets, right?

"High-pressure jetting. ”

Ye Qing said firmly: "Using extremely fine metal powder mixed in a pressure vessel, this ignition effect is no less than the metal jet of armor-piercing bullets. ”

"The finer the metal powder, the more it burns. Take the most common type of iron, ordinary iron, which cannot be burned for a lifetime with a lighter. But nano-scale iron powder ignites with a little fire. And nano-scale iron powder can be bought from the Internet. ”

"For these industrial experts, it is possible to burn through the shell of the safe and use a few small tools to pry open the mechanical lock structure inside. ”

“……”

Oh my god, which engineer is this who has enough to eat and run away to be a thief?

What kind of jewelry is stolen with this technology, going to the United States as a spy, stealing high-tech materials.

After listening to Ye Qing's popular science, the policemen were about to burst into tears, they felt that these masters who were proficient in industry were too terrible.

If......

What would happen if an industrial genius like Mr. Ye did those things that violated the law and discipline?

This is a very desperate speculation, but the police present thought about it again, and Mr. Ye casually took out a thing, which could be worth the price of one of their General Bureau buildings.

Their hearts were suddenly relieved and comfortable.

In his eyes, tens of millions of gold jewelry are estimated to be a bunch of dispensable materials.

"This will be a big case that will cause a stir in the internal system of the police across the country. Amazed for a long time, Zhang Zhitong sighed: "I really don't have any confidence in catching them if I can come up with such unheard-of methods." ”

"Give it a try and check the universities and labs. Ordinary technicians do not have the ability to do this. If the ratio of thermite is not good, it will become an incendiary bomb and burn itself into a turkey. ”

Ye Qing also sighed: "With this technology, it's a pity not to come to our factory to work and be a thief." (To be continued.) )