Before returning to the college entrance examination, I became popular in the science circle

Today, Wu Tong, with the continuous accumulation of rapid learning, understanding and time, has accumulated a wealth of knowledge that can be said to be a walking library.

All kinds of material information can be said to be at your fingertips.

In an instant, detailed information on the top ten high-temperature-resistant materials in physics jumped out of Wu Tong's stored memory and appeared in Wu Tong's mind.

Currently in nature, the substance with the highest melting point in the world today is hafnium alloy.Hafnium alloy contains the metallic element hafnium. The substance with the highest known melting point is the compound of hafnium, tetratantalum hafnium pentacarbide Ta4HfC5, with a melting point of 4215 degrees Celsius.

Ranked second is graphite. Graphite is an allotrope of elemental carbon. The melting point of graphite is 3850±50℃ and the boiling point is 4250℃. Even after ultra-high temperature arc burning, the weight loss is very small and the thermal expansion coefficient is very small. Very small.The strength of graphite increases as the temperature increases. At 2000°C, the strength of graphite doubles.

Ranked third is diamond, which is what we commonly call "diamond". It is also the original body of diamond. It is also a mineral composed of carbon. It is also an allotrope of carbon and is currently known to be natural. The hardest substance exists, with a melting point of 3550°C.It’s just that all the valence electrons in diamond participate in the formation of covalent bonds, there are no free electrons, and it does not conduct electricity.

The first three have their own advantages and disadvantages, but they are all somewhat unsuitable.

Wu Tong focuses more on the fourth-ranked metal tungsten. Tungsten has an atomic number of 74, an atomic weight of 183.84, and a melting point of 3400°C.

It is steel gray or silver white, has high hardness, high melting point, and is not corroded by air at room temperature. It is a good choice of projectile material. The most important thing is that China is still the largest tungsten reserve country in the world. , if tungsten is used in a large area and the reserves are insufficient, it will not be choked by the international community.

As the most heat-resistant metal, tungsten and tungsten alloys have actually entered the eyes of aerospace researchers. It has high density, the highest strength among refractory metals, high elastic modulus, small expansion coefficient, and low vapor pressure.

Tungsten alloy with added alloy elements has good wear resistance, corrosion resistance, electrical conductivity and thermal conductivity.The structural design and safety performance issues of aerospace equipment are closely related to the physical, chemical and mechanical properties of the materials used...

Tungsten metal has a series of excellent physical and chemical properties and can meet the material performance requirements required by aerospace. Therefore, it has become more and more widely used in some key components of satellites, aircraft, aerospace engines and other equipment.

The absolute deduction instinct and the absolute deduction direction also told Wu Tong that her choice was not wrong.Pure metal tungsten has the disadvantages of being difficult to process and brittle, so it is definitely not possible to use it directly as a projectile material.

Otherwise, domestic projectile materials have already been used, and there is no need to wait for her to use them here and derive new materials.

On this basis, she needs to deduce the process technology that can correctly utilize tungsten and maintain the superior properties of tungsten, and develop new tungsten materials to be used in the most critical warhead material.

Time slipped away quietly during Wu Tong's research and development, bringing the breath of spring and the joy of Wu Tong's harvest.

Single crystal technology, which makes positive use of material properties and can increase material properties year-on-year, was naturally used by Wu Tong. After extensive calculations and deductions, it was not difficult to derive single crystal tungsten suitable for warhead materials.This step, the most difficult one, is the order in which the crystal lattice is arranged and extended.

Today, Wu Tong is more aware of the co-bonding effect, which is her specialty.The arrangement of the crystal lattice can be said to have opened a new chapter in Wu Tong's hands.

Manuscripts were stacked on the corner of the table by Wu Tong, verifying Wu Tong's initial breakthrough in hypersonic missiles. They were properly stored in the opened security box and later placed in a safe for safe keeping.A smile appeared on Wu Tong's lips, a sign of recognition for his work.

The smooth derivation of the warhead material in the first step seemed to indicate that the subsequent research would go smoothly. Wu Tong took advantage of his hands to start the second step of the main arrow body material research.

Regarding tungsten metal, Wu Tong values ​​​​more that tungsten can improve the high-temperature hardness of steel. The performance parameters of MC-4 special steel are actually very superior. On this basis, Wu Tong continued to extend the current level and use it as the main projectile material.This step of derivation is to re-optimize on the original basis, which is still not too difficult for Wu Tong.

Design model, derivation parameters, design preparation process... After a series of derivation and simulation, the second main projectile material MCW-1, a metal-based heat-resistant material with metal tungsten as the core, was born in the hands of Wu Tong .

Metal Matrix Composite Materials (MMCs) are composite materials artificially combined with metal and its alloys as a matrix and one or several metal or non-metal reinforcement phases.

Most of its reinforcing materials are inorganic non-metals, such as ceramics, carbon, graphite and boron, etc. Metal wires can also be used.It forms a modern composite material system together with polymer matrix composites, ceramic matrix composites and carbon/carbon composites.

Although it is the first time to play with metal-based materials, one method can be applied to all methods. After nearly two years, after numerous materials research and development accumulation, Wu Tong has made a breakthrough in materials, where quantitative changes lead to qualitative changes. In this research, it is a breakthrough style of explosion.It can almost be said that she is playing around, picking up all kinds of materials at her fingertips, innovating the old and bringing out the new, doing it with ease, and having complete control with ease.

The birth of the new micro-nano composite-oxidation pressing technology has once again filled the domestic technology gap and laid the foundation for metal-based materials.

She uses the nano-scale ultra-high temperature ceramic MC-4 phase and the micron-scale tungsten matrix to achieve coherent reinforcement of the ceramic relative to the refractory matrix and the reinforcement of the refractory metal, thereby achieving high-temperature strength and toughness of the material, matrix resistance to oxidation, and lightweighting .

At the same time, through the surface oxidation inhibition design, a gradient composite ceramic thermal protective layer is grown in situ on the surface of the substrate, which has high thermal matching and strong metallurgical bonding with the substrate. The nanoceramic phase is prepared by micro-nano composite in-situ reaction. Reinforced refractory metal matrix composite materials achieve high temperature, high strength and toughness of the base material, and an integrated design with the matrix, thereby achieving high radiation, long-term oxidation resistance, and ablation resistance.

Among Wu Tong's predicted properties, this tungsten core metal-based heat-resistant material has a tensile strength that matches the upper limit of ordinary alloy metals, and its high-temperature strength can be improved again, easily heading towards 3000MPa, and can withstand ultra-high temperatures of 3000°C. , without much burning, and able to maintain nearly perfect mechanical properties!

The main elastomer materials have been completed again, and the tensile resistance and high temperature resistance should be enhanced, but the weight cannot be increased compared to the same period last year.The weight of the projectile is also a key factor affecting speed and maneuverability.