Titanium Fasteners are known as the "rice of industry". Academician Wu Guanghui, the chief designer of the C919 large passenger aircraft, praised fasteners as "counting in the tens of thousands, classified in groups, connecting structures, linking systems, small in size but significant in function". Due to the different application fields, people use different metal materials to manufacture fasteners.
Today, let's talk about titanium alloy fasteners.
Advantages of titanium alloy fasteners:
1. Low density, high strength and high specific strength.
Compared with steel materials, titanium alloys have a lower density and are lighter. Extensive use of titanium alloy fasteners can significantly reduce the weight of machinery and decrease energy consumption. This is not only an environmental issue but also a clear economic benefit. Some may argue that aluminum alloys have a lower density and are lighter, so they are more economical. However, the application of fasteners should consider not only density but also material strength and usage environment. Titanium alloys have higher strength and specific strength than aluminum alloys and are more suitable for extreme environments such as space and the ocean.
2. Strong corrosion resistance.
Titanium is not corroded by many corrosive media, such as seawater, wet chlorine gas, chlorite and hypochlorite solutions, nitric acid, chromic acid, metal chlorides, sulfides, and organic acids. It is precisely because of this property that titanium alloy fasteners are widely used in marine engineering, chemical refining, and other fields.
3. Good heat resistance.
Aluminum loses its original properties at 150°C, and stainless steel at 310°C, while titanium alloys maintain good mechanical properties at around 500°C. When an aircraft reaches 2.7 times the speed of sound, the surface temperature of the aircraft structure reaches 230°C. At this point, aluminum alloys and magnesium alloys can no longer be used, but titanium alloys can meet the requirements.
4. Non-magnetic.
Titanium is a completely non-magnetic metal, so fasteners made of titanium alloys are more suitable for use in various precision machinery, avoiding additional magnetic effects on these machines. The non-magnetic property of titanium alloy fasteners is very important in the aerospace industry.
5. Low thermal expansion coefficient and elastic modulus.
The thermal expansion coefficient and elastic modulus of titanium alloy materials are lower than those of nickel alloys and steel materials. Within the same temperature range, titanium alloys generate less thermal stress, so they have higher thermal fatigue resistance.
6. High aesthetic level.
The surface of titanium metal can present a variety of colors, so it is also called "colored titanium". This "coloring" skill is a unique characteristic of titanium metal. Many people apply this property to titanium jewelry, which is very popular. However, as titanium products are further applied in the civilian field, people are not only attracted by their excellent performance but also pursue their beautiful appearance. More accurately, titanium metal in the civilian field is a combination of performance and aesthetic level. Titanium alloy fasteners are no exception. Many people like to use colorful titanium alloy fasteners to showcase their unique characteristics.
The application of titanium alloy fasteners:
1) Aerospace
2) Marine engineering
3) Chemical industry
4) Civilian field
In conclusion, titanium alloy fasteners have excellent comprehensive performance and are suitable for application in many industries. Relatively speaking, titanium alloys are more expensive and are widely used in military, chemical, medical and large-scale engineering fields. However, at present, in the civilian field, there are still certain thresholds for titanium alloy fasteners and titanium alloy products. But with the advancement of titanium material production technology, titanium alloy fasteners are bound to be better promoted in the civilian field.
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