Seeing that Song Changzheng finally couldn't hold back and began to be excited, Director Zhao smiled: "Of course, the information in this area is naturally more complete than you have to grasp, let me tell you, if the Trident II submarine-launched missile does not have carbon fiber reinforced aluminum matrix composites, the range will be reduced by at least 20% to 30%, you know...... Forehead ......"

Director Zhao paused as he spoke, and he couldn't do it if he didn't pause, because he didn't know the specific parameters of the carbon fiber-reinforced aluminum matrix composite materials used by the United States on the Trident II submarine-launched missile.

So I can only look at Zhuang Jianye, the meaning is obvious, hurry up and tell me how your carbon fiber reinforced aluminum matrix composite materials are, so as not to make his old brother embarrassed again.

The customer's demand is Zhuang Jianye's unshirkable responsibility, so the moment Director Zhao's eyes came, he quickly smiled and opened the conversation: "The specific strength of the general titanium alloy is 1.1, the specific modulus is 102, and I don't know what the data is for the Americans, but the specific strength and specific modulus of our carbon fiber reinforced aluminum matrix composites are 3 times that of titanium alloys." ”

"So high!"

As soon as Li Fang said this, his eyes widened instantly, and he felt a little incredible, you must know that specific strength and specific modulus are common ratio quantities in materials science, which mainly show the absolute weight or pressure that the material can withstand per unit volume, and also measure the structural strength of the material.

The higher the value, the higher the strength of the material and the lower the unit usage.

Therefore, these two values are the most critical data for measuring materials in the aerospace field, and there is no way, the aerospace field pursues materials with light weight and high strength.

In the past, titanium alloy was regarded as the carrying handle of this kind of material, and now carbon fiber reinforced aluminum matrix composite materials instantly crush titanium alloy on key data, as Li Fang, who specializes in materials and systems engineering at Naval University of Engineering, how not to be shocked.

As a result, before Li Fang's surprised expression was released, Zhuang Jianye's next expression made his surprise come to a second superposition: "This is not high, with the characteristics of carbon fiber reinforced aluminum matrix composites, at most it will be a D-50 casing, of course, because it is light, the effect of weight reduction is still obvious, but the contribution rate is also about 10%, after all, magnesium alloy is also very light."

The other two materials that really play a key role, first of all, the specific strength and specific modulus are five times higher than the titanium alloy silicon carbide fiber reinforced aluminum base material, compared with the previous alloy materials, silicon carbide fiber reinforced aluminum base material is lighter, higher strength, better heat resistance, so with silicon carbide fiber reinforced aluminum base material as the core, the work efficiency of the compressor blade made is almost twice as ...... What is the compressor pressure ratio of the improved HX-4-1 core engine?"

Zhuang Jianye asked Qian Qiang, and Qian Qiang replied without hesitation: "It has increased from the previous 6 to 7.2." ”

Zhuang Jianye nodded, and then said: "Then there is the titanium-based material reinforced with silicon carbide fiber, which is also the most critical material of D-50 except for turbine blades, with specific strength and specific modulus six to eight times that of ordinary titanium alloys, and in addition, the mechanical properties are still very good at high temperatures above 800 degrees Celsius."

So this material is used in combustion chambers, turbine discs, turbine guide plates and propeller shafts, which is the reason why a large number of applications of silicon carbide fiber reinforced titanium-based materials, although our D-50 has been extended to three meters long, but the overall mass is controlled at 857 kilograms.

However, this does not mean that the performance of our D-50 cannot keep up, on the contrary, it is precisely because of the application of a large number of metal matrix composites, coupled with the nickel-based alloy turbine blades equipped with a cooling system, that the pre-turbine temperature of our improved HX-4-1 core engine has increased from the previous 1000K to the current 1350K. ”

"It's from 727 degrees Celsius to 1,077 degrees Celsius. Qian Qiang added on the side.

"It's increased by 300 degrees Celsius!" Not only Li Fang at this time, but even Song Changzheng couldn't help but exclaim.

Zhuang Jianye nodded with a smile a little embarrassed: "This is already the limit of the HX-4-1 core machine, and the next step is to integrate the existing advanced materials on the basis of the HX-4-1 core machine, and develop a cycle power of 6 megawatts, an air intake of 11, and a total temperature of 1600K to 1650K before the turbine, which is 1327 degrees Celsius to 1377 degrees Celsius."

The current model name is tentatively set as HX-11-6 core machine; on the other hand, it is based on D-50 to continue to dig deep into its potential, and strive to launch including turboprops, turbofans and gas power units for power generation, of course, if you want to do this, the most important thing is to solve the reliability problem of D-50 first, after all, the current D-50 overhaul interval is somewhat short, compared with similar foreign products, the gap is more obvious. ”

The three of them were dumbfounded when they heard this, Director Zhao didn't need to say it, his head was still confused at the moment, and he handed over the conversation to Zhuang Jianye, shouldn't he talk about carbon fiber reinforced aluminum matrix composites? Why did he talk about the topic crookedly? turned to D-50?

Compared with Director Zhao's confused surprise, Li Fang and Song Changzheng were really shocked, although the navy is also eager for submarine-launched missiles, but the main body of submarine-launched missiles is not dominated by the navy, but Director Zhao's aerospace department has a comprehensive grasp, so the navy is eager to return to the desire but can only passively wait.

In contrast, naval aviation is the focus of the two, after all, from World War II to the present, if you want to go to sea supremacy, you must first obtain air supremacy.

Therefore, the strength of naval aviation determines the level of naval combat effectiveness, and the aero engine is the indispensable core of naval aviation force, which naturally attracts the attention of the two.

But because of this, Li Fang and Song Changzheng were dumbfounded by what Zhuang Jianye said, and the temperature before the turbine actually reached 1077 degrees Celsius.

The turboprop of the same class is only 6 degrees, but it is only 792 degrees Celsius.

It was 285 degrees Celsius higher.

What does this mean? D-50 still has potential to be tapped.

Because the turboprop-6 of 792 degrees Celsius has reached the level of 3,000 kilowatts, and the D-50 of 285 degrees Celsius is definitely more than this level, you must know that the aero engine wants to increase the power is to increase the temperature before the turbine, every 100 degrees Celsius increases, the power will increase by 20%, and the D-50 is 285 degrees Celsius higher than the turboprop-6, and the power should be increased by nearly 60%.

In other words, the D-50 of this model is only because the turboprop system has not fully realized its potential, and if it is replaced by a large bypass ratio turbofan, or a small bypass is more than the turbofan, the effect will be immediately apparent.

At today's pre-turbine temperature, the D-50 will have 4 to 6 tons of thrust when converted to these two engines.

This data is terrible, you must know that the turbojet engine on the J-7 is now at this level, but this is only on paper, the practical application is far from reaching, if the D-50 of the Tengfei Aviation Corporation can be changed to a small duct than the turbofan afterburner, J-7 will have a qualitative leap?

Li Fang and Song Changzheng kept reverie in their minds, and at this time, Zhuang Jianye said the most critical defect, the reliability problem, and the two people who were in reverie immediately chuckled in their hearts, and Li Fang immediately asked: "Then what is the overhaul interval of your D-50 today?"

Zhuang Jianye didn't speak, but looked at Qian Qiang, who sighed helplessly and said in frustration: "It's just 1860 hours." ”

As soon as these words came out, Li Fang almost stumbled, and shouted urgently: "Such a high overhaul interval is still called poor reliability?"