Abstract On July 22nd, at the Xiaomi 4 conference, Rebs spent a lot of time interpreting the “art tour†of austenitic 304 stainless steel. For a time, whether the austenite 304 is high or not has caused a lot of saliva. Of course, this is not a hand...
On July 22nd, at the Xiaomi 4 conference, Rebs spent a lot of time interpreting the “art tour†of austenitic 304 stainless steel. For a time, whether the austenite 304 is high or not has caused a lot of saliva. Of course, this is not the first slobber caused by the body of the mobile phone, and naturally it is not the last time. The mobile phone body material is indeed the "hardest hit" for mobile phone manufacturers to attack each other. Because the screen material of the mobile phone is relatively uniform, Corning glass is basically used at present, and the choice of the material of the fuselage is relatively diverse. Today, Xiaobian introduces you to interesting things in the mobile phone body material. Engineering plastic
The more common material of the mobile phone body is engineering plastics, or more accurately, general engineering plastics. General engineering plastics generally have five major types, including polyamide (PA), polycarbonate (PC), polyoxymethylene (POM), polybutylene terephthalate (PBT), and polyphenylene ether (PPE). These engineering plastics are popular among mobile phone manufacturers because of their low price, strong plasticity and easy coloring. For example, Nokia N9, HTC8X, iphone5C and other color smart phones are all made of polycarbonate. It is the only transparent of the five engineering plastics and easy to color.
Of course, engineering plastics also have shortcomings, poor heat dissipation and serious environmental pollution. In addition, in the eyes of many users, the plastic body looks very cheap, no grade. In contrast, Xiao Bian feels that the reasons behind may be more adequate.
Kevlar
The name of this material is relatively unfamiliar. Even if it is a material professional, if it is not the direction of polymer and composite materials, I am afraid that many people are not sure what it is. Kevlar is an aramid fiber material developed by DuPont of the United States. It has the characteristics of low density, high strength, good toughness, high temperature resistance, easy processing and molding, and can be used in military fields such as bulletproof vests and tank composite armor. The Kevlar material is used on the back panel of the Motorola XT910.
As a mobile phone body material, Kevlar's biggest benefit is scratch resistance. The Kevlar material is used on the back panel of the Motorola XT910. There have been mobile phone media in China that have done scraping experiments on this mobile phone, and it is indeed amazing in scratch resistance. However, there are fewer brands on the market using Kevlar as the fuselage material. Perhaps in terms of beauty, Kevlar is not very outstanding. In the words of Luo Yonghao in hammer technology: "Kevlar came to the world, from head to toe, every pore was dripping with a sense of cheapness."
Magnesium alloy
With the gradual popularization of lightweight, aluminum alloys, magnesium alloys, and titanium alloys have been used for many years, and have also been applied to the fuselage. Compared with plastics, the hardness of magnesium-aluminum alloy is several times higher, and the heat dissipation performance is much better. Magnesium-aluminum alloy is also easy to color, and the silver-white magnesium-aluminum alloy casing makes the product more luxurious and beautiful, and becomes pink blue and pink through the surface treatment process. In addition to its outstanding performance in the aviation field, it has invisibly upgraded the grade of magnesium-aluminum alloy (the manufacturer also intentionally or unintentionally promoted its own body is "aerospace material" magnesium alloy). Therefore, magnesium alloy is becoming the best choice for becoming a mobile phone body. The Sony LT28h, ihphone 5S, and Htc One use a magnesium-aluminum body.
Of course, magnesium alloys also have disadvantages. One is higher cost and the molding process is much more complicated than plastic. In addition, magnesium alloys are not wear resistant and are easy to fall off. If you don't pay attention to protection during use, the fuselage will be left with ugly traces.
Similarly, titanium alloys, which are also the darling of aviation materials, have some applications on the fuselage. In contrast, the titanium alloy body can withstand a certain intensity of impact, and will not leave traces. At the same time, titanium alloy also has anti-corrosion function. However, it is more expensive than magnesium alloy.
stainless steel
The protagonist of the saliva war in recent times is a member of stainless steel - austenitic 304 stainless steel. The so-called austenitic stainless steel is stainless steel having an austenite structure at normal temperature. It has been in existence for hundreds of years and is the most common and most used variety of stainless steel. 304 stainless steel is also one of the most common steel grades in austenitic stainless steel. This designation refers to the grade of the American ASTM standard. It is called 18-8 stainless steel in China and the national standard is 0Cr18Ni9.
It is precisely because this protagonist is too ordinary, so whether it is Xiaomi's opponent or ordinary netizen, this "stainless steel art tour" of Xiaomi is not bought, quite a lot of spit. For example, "Is an industrial use of rotten 304 stainless steel, plus a few adjectives can become taller?", "Give you a term "austenite" is just a non-metallic professional layman. One kilogram Less than 20 yuan, if the millet fuselage steel plate has 50 grams, the raw material will be worth 1 yuan. "...The major technology media also joined the ranks of Tucao, even put a metallographic picture in the article.
Using stainless steel as the fuselage material is not the first of Xiaomi. Meizu used 304 stainless steel, but Apple also did it in the early days, but later turned to magnesium alloy. However, stainless steel is not common as a mobile phone body, mainly because of its high density and difficulty in coloring. If you want to dye, you can only use the chemical coloring method with complicated process, which is costly.
Liquid metal
If it is said that Xiaomi 4 will use a liquid metal body, it will definitely flash the domestic and foreign mobile phone manufacturers and many rice noodles. In contrast, liquid metal is the real thing. Ultra-high strength, wear-resistant, scratch-resistant, anti-corrosion, and it is a one-shot molding. It is smooth without sanding. Liquid metal has been suitable for use in electronic products since its birth. It is a pity that liquid metal has always been rumored and no physical objects. Before the iphone5S came out, the mobile phone industry was about to show up the liquid metal body, then ihpone6, then ihpone7. The liquid metal fuselage has not been seen for 4 years and has only been used on some small parts. The reason is that the price of liquid metal is high and the problem of mass production has not yet been resolved.
However, if the liquid metal body really appears in the past one or two years, it is only possible to be on Apple. The reason is that Apple has spent huge sums of money to purchase exclusive use of liquid metal from Liquidmetal Technologies, the world's only mass-produced company.
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