1 corrosion-resistant aluminum decorative material
Because the aluminum oxide protective film naturally formed in the atmosphere is very thin, the protection effect on the metal is not good. In order to further strengthen the corrosion resistance of the aluminum metal, humans have invented the anodizing protective film treatment technology, using artificial methods. Form a more oxidized protective film. The method is to soak the aluminum metal product in the electrolyte, and use the aluminum metal material as the anode to pass the current, thereby forming an oxide film on the surface of the aluminum metal. Then, by changing the composition of the electrolyte, temperature, current density, and composition of the aluminum alloy, different oxide films can be obtained, and different metal surface colors such as gold, silver, and black can be obtained, which gives the aluminum alloy sheet a good Decorative. A large number of such aluminum alloy sheets are now used for curtain wall decoration materials for high-rise buildings.
2 low yield ratio steel
The ratio of the yield strength to the ultimate strength of a steel is called the yield ratio. It reflects the safety function of the steel subjected to force exceeding the yield limit to destruction. If the yield ratio is smaller, the reliability of the steel when it is subjected to the force exceeding the yield limit is greater, and the structure is relatively safe. Therefore, for steel materials that are used in large quantities in engineering, it is not only desirable to have a high strength limit and yield strength, but it is also desirable that the yield ratio can be appropriately lowered.
3 high corrosion resistance metal and titanium alloy building materials
Titanium has many advantages, such as high strength, good toughness and weldability, and strength titanium alloy, high temperature mechanical properties and high durability. Its excellent corrosion resistance is mainly due to a thin and dense oxide film formed on its surface. The decorative properties of titanium are also very good. Titanium metal can be oxidized to form a titanium dioxide film layer. Then, by the interference of light, different colors can be emitted according to different thicknesses of the film layer to form a colored titanium alloy plate whose color is different due to the wavelength distribution of the incident light, the incident angle, The thickness and the refractive index of the oxide film layer and the roughness of the titanium metal surface exhibit subtle changes, and a metallic luster that cannot be achieved by the coating layer can be obtained.
4 new stainless steel
The new stainless steel material does not contain nickel, but adds some metal elements with better stability, thus forming a high-purity bainitic stainless steel material, which has greatly improved corrosion resistance, and heat resistance and welding processing properties. It has been greatly developed. Since stainless steel exhibits fragility at a high temperature of 450 ° C, it is suitable for use in an environment below 300 ° C. Nowadays, a new type of stainless steel with a large chromium content has been produced, which can withstand high temperatures of 500-700 ° C, and is mainly used for fire-resistant coverings in thermal power plants or buildings.
5 refractory steel although steel
It has a very high strength at normal temperature, but due to poor heat resistance, the strength is lowered with the increase in temperature, and the deformation is very serious. With the development of high-rise buildings and the increasing density of urban buildings, it is necessary to develop fire-resistant steel and improve the fire and fire resistance of buildings. In order to improve the fire resistance of steel structures, it is possible to apply a refractory coating on the surface of the steel or to cover the surface of the steel with a refractory material.
6 decorative metal surface film
The metal surface film used for the decoration of buildings has been widely used in ancient times, and ancient gold foil is used as a decorative material. However, since the price of gold foil is very expensive, it is impossible to use it for the decoration of buildings. Therefore, most of the buildings with metal finishes are made of copper plates, which are oxidized by copper in the atmosphere to form a natural rust to increase the architectural decoration effect. In addition, metal materials such as aluminum and titanium are also decorated in buildings.
7 amorphous metal
The internal material of the general metal material is arranged neatly in the form of a space lattice in a regular manner, that is, a crystal structure is formed, so that it has a high strength and is a good conductor of electricity and heat. However, the amorphous metal is formed by freezing a liquid metal in a molten state at a high temperature, and the internal particles do not have sufficient time to go to the crystal nucleus and are arranged in a regular manner, and are frozen in a short time.