The river has two banks, facing each other across the river. No matter how good the products are, if there is no bridge to communicate, they can only "stare blankly". Only by building bridges, communicating with each other, coexisting with each other, developing each other, and learning from each other's strengths can we treat the future well in cooperation. The world of metal materials also needs to build bridges to integrate across borders.
The progress of human material civilization is just like Darwin's theory of evolution, which is always in the process of exploration, exploration, and deductive changes. In a sense, the process of material advancement is also the carrier and interpretation of material civilization changes.
Take the current market information about the use of titanium casings for lightweight Apple mobile phones. The titanium circle seems to have found "a big consumer tree", and there is such a whimsical judgment that the mobile phone market all over the world uses titanium casings. The market potential is too great! Algorithms are quite subtle and idealized, but titanium is not the only thing in this world.
From the perspective of lightweight, titanium is indeed better than steel. The density of steel is generally 7.85 grams/cm3 (different steels have different densities), and the density of titanium is 4.51 grams/cm3. Compared with steel, titanium has indeed achieved lightweight. But don't forget that if you consider it only from the perspective of lightweight, the density of magnesium-aluminum alloy is about 1.8g/cm3, and the low density of magnesium-aluminum alloy improves its specific performance. Magnesium-aluminum alloy has good strength, rigidity, and dimensional stability. Therefore, titanium is not the only material selected for lightweight. In terms of commonality, metallic titanium has both magnesium and aluminum alloys. From the perspective of physical color change and the memory function of titanium-nickel alloy, titanium is superior. Therefore, lightweight titanium is not the only metal material to choose from, and titanium can be selected for specialization.
The density of the composite material is about 1.7g/cm3, the density of the aluminum-lithium alloy is 2.7g/cm3, and the specific strength of the composite material is 6 times that of the aluminum-lithium alloy. Compared with the metal materials used in the current rocket tank structure, composite materials have the advantages of lower density, higher specific strength, and better fatigue resistance. According to the People's Daily, new progress has been made in the development of new storage tanks for launch vehicles in my country: the First Institute of China Aerospace Science and Technology Corporation has assembled domestic superior forces and has successfully developed my country's first 3.35-meter-diameter aluminum-lithium alloy storage tank engineering prototype, composite material storage tank, etc. The box principle prototype will further reduce the weight of the rocket body and increase the rocket's transport capacity.
Compared with the current international mainstream aluminum-copper alloy storage tank, the strength is increased by about 30%, and the structure weight is reduced by more than 15% under the same conditions. In addition to metal materials, the application of composite materials can also greatly reduce the weight of the tank. It is reported that the principal prototype of my country's first 3.35-meter-diameter composite storage tank was born in the First Academy of Aerospace Science and Technology Group. The tank is mainly used in the liquid oxygen environment. Compared with the metal tank, it can reduce the weight by 30% and has higher strength. It can greatly improve the structural efficiency and carrying capacity of the rocket. It is a new type of lightweight tank. It can be seen that lightweight materials also have their own needs, and each has its own characteristic performance. Any kind of lightweight material is not a panacea. This also tells us that any "hot" project is also caused by a temporary shortage. "The above project must be hurt by involution.
"Materials are always associated with a certain use occasion, and can be composed of one or several substances." This sentence once again proves that materials exist individually and are shared. Human intelligence has changed the singleness of materials. Alloys and composite materials etc. came into being, and their excellent performance even surpassed the "single" performance. Therefore, only by stepping into the material world - jumping out of the titanium circle can we treat the future of titanium well. Titanium has the advantages of titanium, do not magnify the advantages of titanium, the existence of any kind of material has its place. Titanium is only an element in the "cake" of the material world. Find its characteristics, which are different from those of other materials, and make your own "specialized, special and new" characteristics in the symbiosis and win-win situation, instead of magnifying the "advantages" of titanium Only by making titanium in China, the world of titanium materials will have the scientific development concept of "I am in you, and you in me" and a particularly beautiful titanium path.
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