Many friends may not be familiar with titanium, which is recognized as a non-toxic element in the world. The Handbook of Metals edited by the American Metal Society, an authoritative organization in the United States, points out: "Titanium and its compounds are almost inert to the human body physiologically, and titanium is the only metal that has no effect on the autonomic nerve and taste nerve of the human body."
The exploitation and production cost of titanium is high and the price is expensive. Because of its high and low temperature resistance, strong acid and alkali resistance, high strength and low density, it has become a special material for rockets and satellites of NASA, and has also been applied to super projects such as Yutu, J-20 and Shandong ship carrier. After entering the civil field in 1980s, it became the "honorary metal king" in the field of tableware with its natural antibacterial and biological characteristics.
Titanium has the characteristics of 1, low density, high strength and high specific strength.
The density of titanium is 4.5 1g/cm3, which is 57% of that of steel, only a little more than half of that of steel, less than twice that of aluminum and three times that of aluminum. The specific strength of titanium alloy is the largest among common industrial alloys, which is 3.5 times that of stainless steel, 1.3 times that of aluminum alloy and 1.7 times that of magnesium alloy.
2, excellent corrosion resistance
The passivation of titanium depends on the existence of oxide film, and its corrosion resistance in oxidation medium is much better than that in reduction medium, where high-speed corrosion can occur. Titanium is not corroded in some corrosive media, such as seawater, wet chlorine, chlorite and hypochlorite solution, nitric acid, chromic acid, metal chloride, sulfide and organic acid.
3, good heat resistance
Generally speaking, aluminum loses its original high mechanical properties at 150℃, stainless steel loses its original high mechanical properties at 3 10℃, and titanium alloy still maintains good mechanical properties at around 500℃. Titanium has good heat resistance, and is suitable for turbine disks and blades of aero-engine compressors and aircraft rear fuselage skins.
4, non-magnetic, non-toxic
Titanium is a non-magnetic metal and will not be magnetized in a large magnetic field. It is non-toxic and has good compatibility with human tissues and blood.
5, the thermal conductivity is small
The thermal conductivity of titanium is only 1/5 of steel,113 of aluminum and 1/25 of copper.
6, the elastic modulus is small
The elastic modulus of titanium is about 55% of that of iron.
7. Low damping resistance.
This property of titanium can be used as tuning fork, vibration element of medical ultrasonic pulverizer and diaphragm of advanced audio speaker.
What are the biological metal performance advantages of titanium tableware, kitchen utensils and cookers? Bio-metallic titanium is recognized as a healthy and non-toxic element in the world, and it is the only metal that has no effect on autonomic nerve and taste nerve of human body. Titanium has good compatibility with human body and is widely used in the field of human implantation without rejection.
Corrosion resistance In air or oxygen-containing medium, a dense, stable, adhesive and protective oxide film will be formed on the surface of titanium, which gives titanium strong stability and will not show any signs of rust in contact with acid, alkali, moisture and water. The pot produced by it will not cause heavy metal precipitation and immersion in food when it contains salt or acid. Cup products can safely store all kinds of daily drinks, such as tea, milk, cola and so on. Moreover, titanium has no tea flavor and is suitable for different kinds of tea.
Insoluble thermos cups made of titanium have no harmful heavy metals dissolved during the storage of drinks, and completely maintain the original flavor of ingredients. Titanium container is also the only metal vessel that can be used to decoct medicine and store traditional Chinese medicine.
The melting point of high and low temperature resistant titanium is as high as1668 (5) C. When aluminum exceeds150 C and stainless steel exceeds 310 C, the properties will be greatly reduced, while titanium can still maintain high strength and toughness between-253 and 600 C, which can meet the requirements of long-term use.
The specific gravity of high-strength titanium with high specific strength and light weight is about half that of steel, that is, the same pot is half as light as stainless steel, but its strength is almost the same as that of stainless steel.
The anatase titanium oxide film on the surface of natural antibacterial titanium products endows them with natural antibacterial properties, which can not only inhibit bacteria, but also resist oil and pollution.
Oil pollution prevention
Under the irradiation of light, a part of oxygen on the surface of titanium oxide film is removed, which makes water easier to adsorb and closer to water. The antifouling ability of titanium is based on the decomposition of pollutants and pathogens caused by oxidative decomposition reaction and the principle of water film formation and cleaning caused by superhydrophilic effect.
bacteriostat
The unique characteristics of titanium with specially treated surface can kill bacteria attached to the surface under illumination, and also make titanium a practical antibacterial metal beneficial to human body except silver.
Natural and bright colors, without coating and painting, titanium products themselves can show gorgeous colors through surface treatment.
Therefore, in our daily life, we choose titanium wok, milk pot, chopsticks, chopping board, water cup, thermos cup and so on. Very safe for human health.