The building with titanium as the roof, started in 1973. The golden roof of the early-absorbent Japanese shrine at Sagaki-machi, Oita Prefecture, Japan, with an area of about 50 square meters, using 0.4t of titanium; the Shibuya Electric Power Museum used 0.3. 720 square millimeters of thick titanium plate; construction area of 2,500 square meters of Suma Seashore Aquarium in Kobe, 12t of titanium; 4.95t of titanium for Niigata aquarium; 4.95t of titanium for Mito Museum of Art; construction area of Mie Prefecture Children's City 7.5 square meters of titanium; 3500 square meters of construction area of Kawasaki Public Art Museum, 21 tons of titanium; Shizuoka World Shinko Civilization Shrine's golden roof, keel and gable wall herringbone, construction area of 35,000 square meters, titanium 90t ; Fukuoka Rotary Open-Closed Dome, 210m in diameter, 48,500 square meters in construction area, 100t using 0.3mm titanium plate;

 Van Gogh Museum in Amsterdam, Netherlands, using 0.5mm pure titanium 4.3t;

Hong Kong MTRC Central Station, an area of 6,500 square meters, using 0.4mm pure titanium.

In addition to the roof, there are the outer walls, curtain walls, eaves, ceilings, harbor facilities, bridges, subsea tunnels, decorations, monuments, railings, pipes, anti-corrosion coating, etc. of the building.

It was officially opened in 1997. It attracted worldwide attention with its beautiful shape, unique structure and brand-new materials. The Guggenheim Museum (Spain), which was exclaimed as "a miracle" by the press, used 80t of titanium to obtain the world. The attention of numerous builders has begun to be adopted in various countries.

1, why choose titanium for construction?

1.1 Titanium has good corrosion resistance. It can withstand aggressive atmospheric conditions such as urban pollution, acid rain, marine environment, industrial radiation, and volcanic ash, and is especially suitable for use in marine climate environments and industrialized areas.

1.2 The density of titanium is very small, 4.5g / cm3, which is only 57% of steel, 50% of copper, and 1.7 times of aluminum, but the strength is similar to that of steel. Therefore, titanium as a building component can greatly reduce the weight of the structure, is easy to lift and install, can reduce the load of the main structure, lower the center of gravity of the building, and improve the overall seismic resistance of the building.

1.3 The thermal expansion coefficient of titanium is 9.0 * 10-6 / ℃, which is about 50% of stainless steel and 30% of aluminum, which is similar to that of traditional building materials such as glass, concrete, brick, cement, and stone, and is suitable for blending with traditional building materials. . During construction, titanium can be used as a large area as a whole, and there is no need to leave expansion joints to compensate for thermal expansion and contraction.

1.4 Titanium materials can be obtained by shot blasting, sand blasting, embossing and other methods to obtain different surface morphologies. In addition, through the atmospheric oxidation method, anodic oxidation method, chemical oxidation method, etc., the surface of the titanium material can be changed into a variety of colors and patterns to meet people's pursuit of artistry.

1.5 The corrosion resistance of titanium makes it unlike stainless steel and aluminum building materials, and it will be repaired and maintained after about ten years. Although the processing and installation cost of titanium is higher than that of stainless steel, it has a long service life. From the perspective of long-term costs, titanium building materials are the most economical.

1.6 It is easy to be processed into thin plates, and it is not easy to deform, and the welding performance is good. Standard metal forming tools, machining methods and techniques are suitable for shear, forming, machining and Ti joining. Titanium can be connected by components using a universal TIG welding process, and the self-recoverable oxide film of titanium can prevent welding from being damaged.

1.7 Titanium is a silver-gray metal that maintains its own hue at room temperature. The temple often chooses titanium as the roof. One of the important reasons is that the titanium roof gives the impression of simplicity, dignity and atmosphere. In addition, in recent years, some private buildings in Japan, such as houses and tea rooms, have also used titanium building materials, which is all related to the noble, low-key, soft, and calm impression of titanium.

1.8 Titanium is non-toxic, does not decompose metal ions into the groundwater, can be recycled 100%, and has no pollution to the environment. The thermal conductivity of titanium is equivalent to that of stainless steel, which is 1/8 of that of aluminum alloy and 1/20 of that of copper alloy. It has the effect of maintaining the temperature of the building and is a rare green material.

2, Overview of Titanium Used in China's Construction Industry

 Titanium used in China's construction industry is still in its infancy, and it has only been more than 10 years since titanium has actually entered the large-scale application in the construction industry. Although it is not long, the characteristics of titanium materials have been fully utilized in China's construction industry.

 The National Theater's shell is made of more than 18,000 titanium metal plates, with an area of more than 30,000 square meters. Of the more than 18,000 titanium metal plates, only 4 have the same shape. The titanium metal plate has undergone a special oxidation treatment, and its surface has a metallic luster that is extremely textured and does not change color for 15 years.

 Since the mid-1980s, Baotai Group has successively produced some titanium models and sculptures, among which there are also exquisite works like "dolphins and people". However, since the National Grand Theater led by the Hangzhou Grand Theater and Hefei Grand Theater began to use a large amount of titanium, it is troubling that the titanium materials used in these buildings are basically imported from Japan, such as Nippon Steel , Mitsubishi Chemical Corporation, Kobe Steel, etc., but did not use the products of domestic titanium processing enterprises. Faced with such a large amount of titanium buildings, our titanium processors have missed the opportunity, which has caused the titanium industry's personnel to reflect.

Facing the booming titanium buildings, our titanium enterprises have also felt pressure. As the largest titanium processing material company in China, Baotai Group has actively started the development of titanium building materials, and has achieved certain results in the production of titanium gold large-grain plates. It is imminent to accelerate the research and development of titanium building materials and speed, develop varieties of titanium building materials, and reduce production costs. Only in this way will China's titanium enterprises have a place in the field of titanium building materials in the future.

3. Outlook for future titanium building materials

Both China and Japan have long coastlines. Coastal buildings are greatly affected by the marine climate and are severely corroded. In addition, air pollution and acid rain hazards also corrode buildings. Moreover, both China and Japan have many ancient buildings. Compared with the rubble of ancient times and modern copper and aluminum roofs, titanium roofs can better protect ancient buildings from corrosion and make precious material heritage left by their ancestors To be better passed on.

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