Titanium alloy materials have significant application advantages in the field of fasteners. They not only meet the high requirements for material performance in high-end fields such as aerospace but also provide new possibilities for lightweight and high-performance fasteners. With the development of my country's aerospace industry, the level of connection technology used in new aircraft and aerospace vehicles continues to improve, which also puts forward new requirements for new fasteners. Ultra-high-strength titanium alloy fasteners are one of the trends in future development.
The application of titanium alloy materials to fasteners has the following advantages:
(1) Low density. The density of titanium alloys is significantly less than that of steel materials, so titanium alloy fasteners are lighter than steel fastener materials.
(2) High specific strength. Titanium alloy is a metal material with higher specific strength among common metal materials. Taking advantage of its high specific strength, titanium alloy can also be used to replace lighter aluminum alloy materials. When the external load is the same, the geometric size of titanium alloy parts is smaller, which can effectively save space. This material utilization concept is very important for The aerospace field is of great significance.
(3) High melting point. The melting point of titanium alloy is significantly higher than that of steel materials, so the heat resistance of titanium alloy fasteners is better than that of steel fasteners.
(4) The thermal expansion coefficient and elastic modulus are small. The thermal expansion coefficient and elastic modulus of titanium alloy materials are smaller than those of nickel alloys and steel materials. Within the same temperature range, the thermal stress generated by titanium alloys is very small, so titanium alloys have high thermal fatigue properties.
(5) Non-magnetic. The magnetic permeability of titanium alloy is very small and almost negligible, so titanium alloy fasteners are non-magnetic and can effectively prevent interference from magnetic fields. Austenitic stainless steel is also non-magnetic, but subsequent cold working will increase its magnetism, while hot or cold working of titanium alloys does not change its magnetism, which allows titanium alloys to be used in avionics equipment.
(6) Bend strength is higher than strength. The critical strength standard for the design of fasteners that bear tensile loads is the yield strength, followed by the tensile strength, because once the fastener yields deformation, it will lose its tightening effect. Compared with steel materials, the yield strength and tensile strength of titanium alloys are close to each other, and the yield-strength ratio is higher, so the safety of titanium alloy fasteners is higher.
(7) The electrode potential matches the carbon fiber composite material. On fasteners, an important reason why the amount of titanium alloy is very large is that the electrode potential of titanium alloy matches the electrode potential of carbon fiber composite materials, which effectively prevents the occurrence of galvanic corrosion.
(8) In addition, titanium alloys also have the advantages of excellent corrosion resistance and high creep resistance.
With its excellent performance and wide application prospects, titanium alloy fasteners are gradually becoming an excellent choice for future connection technology. With the continuous advancement of technology and the continuous expansion of applications, titanium alloy fasteners will show their unique advantages and value in more fields.
