"But before your dad came over, he could talk to you briefly."
After Comrade Lao Liang was promoted to the director of the sub-bureau, his mount made great progress because he was in the railway field. A two-axle rail bus produced in the 1950s became Comrade Lao Liang’s new mount.
A 15-horsepower diesel engine drives less than 20 tons, and the average axle load of a single car is less than 10 tons. In the decade, the Ministry of Railways of the Republic was definitely one of the fastest vehicles on the road.
According to the statement that two girls have just arrived, Comrade Lao Liang plans to leave Dandong at 4 o’clock in the afternoon before the shift, and he can arrive in Shengjingnan at most later, but it will not delay the family’s dinner and reunion.
Of course, at present, the traffic volume of Shengdan Railway is still busy. At this time, the Republic of China is still receiving a lot of economic assistance from North Korea. The freight train at Yalu River Port is in an endless stream. Comrade Lao Liang is hesitant to come over. If he is in a hurry to have dinner in Shengjing, the trucks in the traffic map of the sub-bureau will definitely have to be temporarily changed, and some goods trains to North Korea may be delayed.
However, the two girls knew from their usual conversation that Liang Yuan had no good impression on that brotherly neighbor, so they urged Liang Bobo to "seek personal gain" and vowed that Liang Yuan might run back to Europe again in a few days.
Considering the tank thing and having Comrade Lao Liang, he finally promised to come over before dinner. If you miss this, Liang Yuan’s whereabouts will be uncertain for half a year. It is really a high probability event for someone to go abroad.
After all, the things planned by Comrade Lao Liang are not far apart even if they are not related to the whole Yuanjia. If you don’t make it clear to Liang Yuan, you can’t move the whole Yuanjia force without Liang Yuan’s back nod, which will definitely get twice the result with half the effort.
Jue Li Yuanling has a look of telling you a long story. Ning Wanjia is cheerful. She takes a plastic stool from the outside and puts it on the sand side. After that, she drives Liang Yuan to the stool and stays in someone’s sad eyes, occupying the whole sand with Ning Wanfei.
Li Yuanling looked funny and shy. Ning Wanjia didn’t agree to Liang Yuan’s request to squeeze sand together, but she was a little deaf and put her little hand on the sand handrail and Liang Yuan grabbed it.
When I was a child, Ning Wanjia liked to tease the adults with Liang Yuan, and she often stared at the dark eyes and nodded with innocence, saying "I am Xiaoyuan Kannika nimtragol". Li Yuanling felt that their childhood feelings would become more and more interesting.
Of course, there is something even more interesting in Li Yuanling’s memory. At that time, once someone squeezed in the wrong place, someone mistook his daughter-in-law. First, he was given a fat beating, and then food or bottles were taken away.
"Actually, it has to start with our policies when the People’s Republic of China was founded …" Yuan-ling Li looked lost in memories.
After the establishment of the Republic, it can be said that there are many things to be done, and the devastated country is matched with a weak economic ability and a large number of illiterate groups.
Although the momentum of 400 million compatriots sounds fierce, most of them can be pulled out to see a low-level charity and lawyers sit and talk, and there are few stars in the huge population base of the big elite.
Not to mention the high precision of aerospace, even the steel-making machinery, which is a heavy industry, needs industrial workers, is still beyond the reach of the newly-born Republic with hundreds of millions of rural laborers.
Even with money and technology, what can no one do? ? Can’t do anything.
Therefore, giving up some industries became an inevitable choice, and after several large-scale meetings involving almost all academicians of the Chinese Academy of Sciences in the 1950 s, it became a last resort for the Republic to seize space flight.
Although aerospace and aviation are the top manifestations of human science and technology, their specific technical problems are quite different.
The physical environment faced by the space shuttle may be much worse than that of the space shuttle, but many spacecraft work less hours than that of the aircraft, but the environment faced by satellite equipment is almost constant. Except for cosmic radiation and low temperature, there is almost no need to consider the dynamics of production.
This means that the space shuttle can make many materials with one-sided high performance limit, but the space shuttle can’t do this. It is to be continued.
There is another chapter in ps night.
Chapter 12 Selection (Middle)
An example of thermal protection coating for gas turbine of aero-engine; The thermal protection coating for recoverable spacecraft can be made of materials that volatilize when exposed to heat, so that it can take effect in a short time, that is, it needs reliable performance and long service life, and what meets a certain number of minutes is up to standard.
However, it is impossible for an aircraft to do this. The production life of the two is calculated in one minute, and the other is calculated in years. It is basically two different scientific and technological lines.
In particular, the thermal protection coating base of aero-engine blades is an indispensable part of the thermal protection coating of power turbine which bears the impact of high-temperature gas in the combustion chamber. Besides excellent thermal protection performance, the toughness of the coating material should also be considered due to the huge centrifugal force generated by the power turbine at extremely high revolutions.
In the early 1990s, the working temperature of the combustion chamber of the first generation of international aircraft engines was 1,200 degrees, while the heat-resistant temperature of the most advanced single crystal alloy in the same period would not exceed 1,500 degrees.
Because the thermal protection coating of single crystal turbine blade and attached blade of aero-engine can’t be the same material, it will be a very headache engineering problem that different materials expand and contract when the temperature difference changes by 1000 degrees Celsius.
In practice, once the surface of the thermal protection coating of the blade falls off or cracks occur, the mechanical properties of the single crystal alloy blade will inevitably drop greatly after it is subjected to the ultimate bearing capacity temperature, and this extremely fatal accident relative to the aero-engine will occur as scheduled.
"Americans don’t have any good ideas. Because of the problem of thermal expansion and contraction, the corresponding single crystal alloy must cooperate with the corresponding heat-resistant coating." Li Yuanling’s expression was full of ridicule
"When researching single crystal turbine blades, we must consider the expansion and contraction of both the thermal protection coating and the blade substrate, and try to make the thermal expansion numbers of the two as consistent as possible by fine-tuning the proportion of a certain material in the single crystal alloy or the thermal protection coating."
In other words, the control accuracy of each element in the single crystal alloy must reach six digits after the decimal point. If the industry can’t do it, it means that even if you take the single crystal alloy formula, there is no place.
An hour later, Liang Yuan, who was stuffed with information about single crystal alloy and heat-resistant coating, was so stupid that ten parts per million was six digits after the decimal point.
Liang Yuan suddenly remembered the Chinese people’s love for gold ornaments. Liang Yuan vaguely remembered that the merchants selling gold ornaments first boasted about the purity of their own products with four nines after the decimal point and then boasted about six nines after the decimal point entered the new century.
The problem is that the difficulty of single metal purity and controlling the specific proportion of complex alloy elements is equivalent to the difference between kites and space shuttles.
What’s more, it’s ambiguous whether the single metal purity of the Republic of China can get six nines after the decimal point.
It is no wonder that the general formula of single crystal alloy in the future is all over the network, and a lot of information will come out even if I tell you the formula for nothing, and I don’t tell you the specific process and equipment, it is doomed to be nothing.
"It’s so complicated, Mom. Am I so sure that G can separate the heat protection coating technology from mastering the first generation single crystal technology, so that we can get the same technology. Our foundation is equivalent to obtaining an almost abandoned technology?" asked Liang Yuantou Dabi.
Li Yuanling nodded and said, "The three kinds of heat-resistant coatings of single crystal alloys produced by the three major international power plants are all specially made. Except for the heat-resistant coatings at the beginning of single crystal research, it is absolutely impossible to develop a first-class turbine blade even if the latest single crystal alloy of ge is equipped with the best roller heat-resistant coating."
"To put it bluntly, even if G embargoed our equipment with the formula of single crystal alloy and the ratio of heat-resistant coating, the problem we faced was still very huge." Li Yuanling looked a little naive.
The so-called backwardness of basic industries can never be expressed in just six words. This backwardness means that every step is faced with several problems.
If we calculate the cost of introducing Spey Airlines into the Republic in the past, what do you see when you spend less than RMB 3 billion on the polar field of motivation in Jiahang?
International top-level blade gas film cooling technology has no blade heat protection coating technology, single crystal alloy technology, integral turbine disk technology and is not far from the production line of Rolls-Royce equipment and technical support group. Gems and Tyne combustion engines can not run smoothly.
At this time, Brilliance Power is just a large-scale aviation assembly and maintenance factory with a little modification ability. Even this assembly factory can only be successfully completed and put into operation by a talented chief engineer like Li Yuanling.
This pit is really big. It’s much more exciting than the ball. Liang Yuan takes pleasure in thinking about it.
Of course, Liang Yuan is by no means the only local tyrant who chose to jump into the pit in this era. For example, some behind-the-scenes shareholders are trying to enter the aviation procurement catalogue v25.
At this time, Liang Yuanqian was so arrogant that the Japanese wooed the first v25 wide-chord turbofan made by the international aero-engine company jointly established by Rolls-Royce, Pratt & Whitney, U and Fiat.
However, Liang Yuan knows that this ambitious international joint project is very funny and cunning. The Italian company just set up and chose to run away. The West German U and Japanese consortium, with deep pockets, continued to muddle along with Rollo and Pratt & Whitney.
The v25 project belongs to Japan and west Germany, and then four multinational joint companies with equal shares look fair and beautiful. both west Germany and Japan hope to gain manufacturing experience in manufacturing first-class aero-engines through this international cooperation
Of course, if the three major international aviation powers can be turned into four, it will be more in line with the aesthetics of Japan and West Germany.
It’s a pity that the wish is a wish after all. These two guys, Rolls-Royce and Pratt & Whitney, took Japanese and German research funds to verify their own new fan concept and their own new combustion chamber, and then the two companies changed hands to put the new technology in Rida Column and p4 Column.
Twenty years later, Nishikawa Island Heavy Industry, which has rich international experience, can produce world-class power turbines, and the production capacity of German U-power turbines is also the top level in the world, but neither of them can design even a small thrust motor.
The motivation and fate of v25 can be said to have been hanged by gf from the moment of its birth. If Pratt & Whitney and Rollo really join hands, even if they don’t crush ge, it’s still a problem. The embarrassing performance of v25 can prove that these two giants are malicious paddling at all
Feeling that Liang Yuan was in a low mood, Li Yuanling comforted and said, "The fact is not bad. Xiaoyuan should know that it is much easier to introduce equipment than technology."
Liang Yuan nodded and asked, "I still don’t understand my mother and Wu’s choice of heat-resistant coating technology and heat treatment technology for afterburner metal."
"As far as the aero-engine field is concerned, there is not much difference between choosing single crystal alloy or heat-resistant coating. The teacher decided to choose heat-resistant coating, which is quite different from that of the port-based Soviet Union." Li Yuanling said with a smile.